B404X Datasheet

This is a graphic of the B404. The B404X has the same exterior dimensions but the appearance may vary slightly from this graphic.

Functional description

Overview

The B Series System-on-a-Module (SoM) is a cellular device with support for BLE (Bluetooth LE). It is based on the Nordic nRF52840 micro-controller.

The B Series is designed to be integrated into your circuit board design, plugging into a M.2 NGFF connector on your board, allowing the module to be changed or upgraded easily.

Features

Features - B404X

  • u-blox SARA-R510S-01B LTE modem (B404X)
    • LTE Cat M1 module
    • Support for United States, Canada, and Mexico only
    • 3GPP Release 14 LTE Cat M1
    • Cat M1 bands: 1, 2, 3, 4, 5, 8, 12, 13, 18, 19, 20, 25, 26, 28, 66, 71, 851
    • Embedded Particle EtherSIM (B404X)
    • Requires Device OS 4.0.0 LTS (or later)

1 Not all bands enabled in software by default

Features - All Models

  • Nordic Semiconductor nRF52840 SoC
    • ARM Cortex-M4F 32-bit processor @ 64MHz
    • 1MB flash, 256KB RAM
    • Bluetooth 5: 2 Mbps, 1 Mbps, 500 Kbps, 125 Kbps
    • Supports DSP instructions, HW accelerated Floating Point Unit (FPU) and encryption functions
    • Up to +8 dBm TX power (down to -20 dBm in 4 dB steps)
    • NFC-A tag
  • On-module additional 4MB SPI flash
  • 24 mixed signal GPIO (8 x Analog, 8 x PWM), UART, I2C, SPI
  • USB 2.0 full speed (12 Mbps)
  • JTAG (SWD) pins
  • RGB status pins for LED
  • Reset and Mode pins for buttons
  • On-module MFF2 Particle SIM
  • Two on-module U.FL connectors for external antennas
  • M.2 interface
  • FCC and PTCRB certified
  • RoHS compliant (lead-free)

Interfaces

Block diagram

Block Diagram

Power

VCC

VCC is used to supply power to the u-blox SARA-R410M/R410S cellular module. The recommended input voltage range on this pin is between 3.6V to 4.2V DC. Make sure that the supply can handle currents of at least 2 A.

3V3

3V3 is used to supply power to nRF52840, logic ICs, memory, etc.. The 3V3 input voltage range is between 3V to 3.6V DC, but 3.3V is recommended. Make sure that the supply can handle at least 150 mA, however it may need to be larger than that if you have additional 3.3V peripherals on your base board.

We do not recommend using a single 3.6V supply for both VCC and 3V3 as the cellular modem performance may be lower below 3.7V. Use two separate regulators for best results.

VBus

VBus is connected to the USB detect pin of nRF52840 to enables the USB interface. The recommended input voltage range is between 4.35V to 5.5V DC.


Antenna

There are two radios on the B402 module. A BLE radio (nRF52840) and a cellular radio (u-blox). We have provided two u.FL connectors to plug in the cellular and BLE antenna. These are required if you wish to use the cellular and BLE. If you do not need BLE, you do not need to connect the BLE antenna.

Certified Cellular Antenna

Antenna SKU Details Links
Wide band LTE-CAT M1 cell antenna, [x1] PARANTC41EA B404X, BRN404X, and E404X Datasheet
Wide band LTE-CAT M1 cell antenna, [x50] PARANTC41TY B404X, BRN404X, and E404X Datasheet

General Antenna Guidance

  • The antenna placement needs to follow some basic rules, as any antenna is sensitive to its environment. Mount the antenna at least 10mm from metal components or surfaces, ideally 20mm for best radiation efficiency, and try to maintain a minimum of three directions free from obstructions to be able to operate effectively.
  • Needs tuning with actual product enclosure and all components.
  • For the BLE antenna, it is recommended to use a 2.4 GHz single-frequency antenna and not a 2.4 GHz + 5 GHz antenna, so as to avoid large gain at the frequency twice of 2.4 GHz which can cause the second harmonic radiation of 2.4 GHz to exceed standards.

Peripherals and GPIO

Peripheral Type Qty Input(I) / Output(O)
Digital 24 (max) I/O
Analog (ADC) 8 (max) I
UART 1 I/O
SPI 2 I/O
I2C 2 I/O
USB 1 I/O
PWM 8 (max) O
NFC 1 O

There are some optional B402 module specific I/O:

  • u-blox USB and VBUS (for u-blox firmware upgrades)

Note: All GPIOs are only rated at 3.3VDC max.

JTAG and SWD

The B402 module has 4 pads at the bottom exposing the SWD interface of the nRF52840. This interface can be used to debug your code or reprogram your B402 bootloader, device OS, or the user firmware. We use 4 pogo-pins connecting to these pads during production for firmware flashing.

Pogo Pins

Memory map

nRF52840 Flash Layout Overview

  • Bootloader (48KB, @0xF4000)
    • User Application
    • 256KB @ 0xB4000 (Device OS 3.1 and later)
    • 128KB @ 0xD4000 (Device OS 3.0 and earlier)
  • System (656KB, @0x30000)
  • SoftDevice (192KB)

External SPI Flash Layout Overview (DFU offset: 0x80000000)

  • OTA (1500KB, @0x00289000)
  • Reserved (420KB, @0x00220000)
  • FAC (128KB, @0x00200000)
  • LittleFS (2M, @0x00000000)

Pins and button definitions

Pinout diagram

Pinout

Pins SOM0 to SOM9 will vary across various SoM modules. For example, cellular-specific pins exists in this range.

Additionally there are RESERVED3 pins, whose functions vary depending on the SoM. For example, nRF52 MCU-based modules use some of these pins for additional ADC and GPIO. They are able to be used as described on the B402, but their function may be be different on future modules.

For maximum cross-module flexibility, you should try to use only the common pins when possible.

GPIO and port listing

Pin Name Module Pin MCU
A0 / D19 23 ADC1       P0.3
A1 / D18 33 ADC2       P0.4
A2 / D17 35 ADC4       P0.28
A3 / D16 37 ADC5       P0.29
A4 / D15 41 ADC6       P0.30
A5 / D14 43 ADC7       P0.31
A6 45 ADC3       P0.5
A7 47 ADC0       P0.2
Cellular Modem USBD- 46          
Cellular Modem USBD+ 44          
Cellular Modem VBUS 74          
D0 22   Wire (SDA)     P0.26
D1 20   Wire (SCL)     P0.27
D2 42   Wire1 (SDA) SPI1 (SCK) Serial1 RTS P1.02
D22 62         P0.24
D23 64         P1.09
D3 40   Wire1 (SCL) SPI1 (MOSI) Serial1 CTS P1.01
D4 66     SPI1 (MISO)   P1.08
D5 68         P1.10
D6 70         P1.11
D7 72         P1.12
D8 48     SPI (SS)   P1.03
MISO / D11 50     SPI (MISO)   P1.14
MOSI / D12 52     SPI (MOSI)   P1.13
NC 14          
NC 75          
NFC1 17         P0.9
NFC2 19         P0.10
RGBB 65         P0.15
RGBG 63         P0.14
RGBR 61         P0.13
RX / D10 38       Serial1 RX P0.08
SCK / D13 54     SPI (SCK)   P1.15
SIM_CLK 71          
SIM_DATA 73          
SIM_RST 69          
SIM_VCC 67          
TX / D9 36       Serial1 TX P0.06
USBDATA- 13          
USBDATA+ 11          
VUSB 16          

ADC (Analog to Digital Converter)

The B404X supports 8 ADC inputs.

Pin Pin Name Description Interface MCU
23 A0 / D19 A0 Analog in, GPIO, PWM ADC1 P0.3
33 A1 / D18 A1 Analog in, GPIO, PWM ADC2 P0.4
35 A2 / D17 A2 Analog in, GPIO ADC4 P0.28
37 A3 / D16 A3 Analog in, GPIO ADC5 P0.29
41 A4 / D15 A4 Analog in, GPIO ADC6 P0.30
43 A5 / D14 A5 Analog in, GPIO ADC7 P0.31
45 A6 A6 Analog in, PWM, GPIO ADC3 P0.5
47 A7 A7 Analog in, GPIO, Ethernet Reset ADC0 P0.2
  • ADC inputs are single-ended and limited to 0 to 3.3V
  • Resolution is 12 bits

UART serial

The B404X supports one UART serial interfaces.

Pin Pin Name Description Interface MCU
36 TX / D9 Serial TX, GPIO Serial1 TX P0.06
38 RX / D10 Serial RX, GPIO Serial1 RX P0.08
40 D3 SPI1 MOSI, Serial1 CTS, GPIO, Wire1 SCL Serial1 CTS P1.01
42 D2 SPI1 SCK, Serial1 RTS, PWM, GPIO, Wire1 SDA Serial1 RTS P1.02
  • The UART pins are 3.3V and must not be connected directly to a RS-232C port or to a 5V TTL serial port
  • Hardware flow control is optional; if not used then the RTS and CTS pins can be used as regular GPIO
  • You cannot use hardware flow control and Ethernet at the same time.

SPI

The B404X supports two SPI (serial peripheral interconnect) ports.

Pin Pin Name Description Interface MCU
40 D3 SPI1 MOSI, Serial1 CTS, GPIO, Wire1 SCL SPI1 (MOSI) P1.01
42 D2 SPI1 SCK, Serial1 RTS, PWM, GPIO, Wire1 SDA SPI1 (SCK) P1.02
48 D8 GPIO, SPI SS, Ethernet CS SPI (SS) P1.03
50 MISO / D11 SPI MISO, GPIO SPI (MISO) P1.14
52 MOSI / D12 SPI MOSI, GPIO SPI (MOSI) P1.13
54 SCK / D13 SPI SCK, GPIO SPI (SCK) P1.15
66 D4 SPI1 MISO, PWM, GPIO SPI1 (MISO) P1.08
  • The SPI port is 3.3V and must not be connected directly to devices that drive MISO at 5V
  • If not using a SPI port, its pins can be used as GPIO
  • Any pins can be used as the SPI chip select
  • Multiple devices can generally share a single SPI port
  • You cannot use SPI1 and Ethernet at the same time.

I2C

The B404X supports two I2C (two-wire serial interface) ports.

Pin Pin Name Description Interface MCU
20 D1 I2C SCL, GPIO Wire (SCL) P0.27
22 D0 I2C SDA, GPIO Wire (SDA) P0.26
40 D3 SPI1 MOSI, Serial1 CTS, GPIO, Wire1 SCL Wire1 (SCL) P1.01
42 D2 SPI1 SCK, Serial1 RTS, PWM, GPIO, Wire1 SDA Wire1 (SDA) P1.02
  • The I2C port is 3.3V and must not be connected directly a 5V I2C bus
  • Maximum bus speed is 400 kHz
  • External pull-up resistors are recommended for I2C as the internal pull-up is 13K.
  • If not using I2C, pins D0 and D1 can be used as GPIO or analog input.
  • You cannot use Wire1 and Ethernet at the same time.

PWM

The B404X supports PWM (pulse-width modulation) on the following pins:

Pin Pin Name Description Timer MCU
23 A0 / D19 A0 Analog in, GPIO, PWM PWM2 P0.3
33 A1 / D18 A1 Analog in, GPIO, PWM PWM2 P0.4
45 A6 A6 Analog in, PWM, GPIO PWM2 P0.5
47 A7 A7 Analog in, GPIO, Ethernet Reset PWM2 P0.2
66 D4 SPI1 MISO, PWM, GPIO PWM1 P1.08
68 D5 PWM, GPIO PWM1 P1.10
70 D6 PWM, GPIO PWM1 P1.11
72 D7 PWM, GPIO PWM0 P1.12
  • PWM that share the same timer (PMW2 for example) must share the same frequency but can have different duty cycles.
  • Pin D7 (PWM0) share a timer with the RGB LED and you should not change its frequency but it can have a different duty cycle.

USB

The B404X supports a USB interface for programming the device and for USB serial (CDC) communications. The module itself does not contain a USB connector; you typically add a micro USB or USB C connector on your base board. It is optional but recommended.

Pin Pin Name Description MCU
11 USBDATA+ USB Data+  
13 USBDATA- USB Data-  
16 VUSB USB VUSB power pin  
44 Cellular Modem USBD+ Cellular Modem USB Data+  
46 Cellular Modem USBD- Cellular Modem USB Data-  
  • The Cellular Modem USB connector is optional, and can be used for firmware updates of the cellular module.

RGB LED

The B404X supports an external common anode RGB LED.

One common LED that meets the requirements is the Cree CLMVC-FKA-CL1D1L71BB7C3C3 which is inexpensive and easily procured. You need to add three current limiting resistors. With this LED, we typically use 1K ohm current limiting resistors. These are much larger than necessary. They make the LED less blinding but still provide sufficient current to light the LEDs. If you want maximum brightness you should use the calculated values - 33 ohm on red, and 66 ohm on green and blue.

A detailed explanation of different color codes of the RGB system LED can be found here.

The use of the RGB LED is optional, however it is highly recommended as troubleshooting the device without the LED is very difficult.

Pin Pin Name Description MCU
61 RGBR RGB LED Red P0.13
63 RGBG RGB LED Green P0.14
65 RGBB RGB LED Blue P0.15

SETUP and RESET button

It is highly recommended that you add MODE (SETUP) and RESET buttons to your base board using momentary switches that connect to GND. These are necessary to change the operating mode of the device, for example to enter listening or DFU mode.

Pin Pin Name Description MCU
32 MODE / D20 MODE button, has internal pull-up P0.11
34 RST Hardware reset, active low. External pull-up required.  

The MODE button does not have a hardware pull-up on it, so you must add an external pull-up (2.2K to 10K) to 3V3, or connect it to 3V3 if not using a button.

The RST pin does have an internal weak pull-up, but you may want to add external pull-up on that as well, especially if you use an off-board reset button connected by long wires.

Pin description

# Pin Common Function nRF52 Description
1 GND GND POWER System ground.
2 VCC VCC POWER System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.
3 GND GND POWER System ground.
4 VCC VCC POWER System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.
5 GND GND POWER System ground.
6 VCC VCC POWER System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.
7 GND GND POWER System ground.
8 VCC VCC POWER System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.
9 GND GND POWER System ground.
10 3V3 3V3 POWER System power in, supply a fixed 3.0-3.6v power.
11 USB D+ USB D+ IO Data+ pin of the NRF52840 USB port.
12 3V3 3V3 POWER System power in, supply a fixed 3.0-3.6v power.
13 USB D- USB D- IO Data- pin of the NRF52840 USB port.
14 NC RESERVED3 NC Leave unconnected.
15 GND GND POWER System ground.
16 VUSB VUSB POWER System power in, USB detect pin for nRF52840. 5V on this pin enables the USB interface.
17 NFC1 SOM33 NFC input P0.9 NFC antenna connection.
18 NC RESERVED3 NC Leave unconnected.
19 NFC2 SOM43 NFC input P0.10 NFC antenna connection.
20 D1 SCL IO P0.27 I2C SCL, and digital only GPIO.
21 GND GND POWER System ground.
22 D0 SDA IO P0.26 I2C SDA, and digital only GPIO.
23 A0 ADC0 IO P0.3 Analog input ADC02, and digital GPIO.
32 MODE MODE IO P0.11 Connected to the MODE button input, and digital only GPIO.
33 A1 ADC1 IO P0.4 Analog input ADC12, and digital GPIO.
34 RESET RESET I Active-low reset input.
35 A2 ADC2 IO P0.28 Analog input ADC22, and digital GPIO.
36 D9 TX IO P0.6 Primarily used as UART TX, but can also be used as a digital GPIO.
37 A3 ADC3 IO P0.29 Analog input ADC32, and digital GPIO.
38 D10 RX IO P0.08 Primarily used as UART RX, but can also be used as a digital GPIO.
39 AGND AGND POWER System analog ground.
40 D3 RESERVED3 IO P1.1 UART flow control CTS, SCL1 (Wire1), SPI1 MOSI, digital only GPIO.
41 A4 RESERVED3 IO P0.30 Analog input ADC42, and digital GPIO.
42 D2 RESERVED3 IO P1.2 UART flow control RTS, SDA1 (Wire1), SPI1 SCK, digital only GPIO.
43 A5 RESERVED3 IO P0.31 Analog input ADC52, and digital GPIO.
44 u-blox USB D+ SOM0 IO Data+ pin of the cellular modem USB port.
45 A6 RESERVED3 IO P0.5 Analog input ADC62, and digital GPIO.
46 u-blox USB D- SOM1 IO Data- pin of the cellular modem USB port.
47 A7 RESERVED3 IO P0.2 Analog input ADC72, and digital GPIO.
48 D8 CS IO P1.3 SPI interface CS, and digital only GPIO.
49 AGND AGND POWER System analog ground.
50 D11 MISO IO P1.14 SPI interface MISO, and digital only GPIO.
51 NC RESERVED3 NC Leave unconnected.
52 D12 MOSI IO P1.13 SPI interface MOSI, and digital only GPIO.
53 NC RESERVED3 NC Leave unconnected.
54 D13 SCK IO P1.15 SPI interface SCK, and digital only GPIO.
55 NC RESERVED3 NC Leave unconnected.
56 GND GND POWER System analog ground.
57 NC RESERVED3 NC Leave unconnected.
58 NC RESERVED3 NC Leave unconnected.
59 NC RESERVED3 NC Leave unconnected.
60 NC RESERVED3 NC Leave unconnected.
61 RGBR RED IO P0.13 Red pin of the RGB LED.
62 D22 GPIO0 IO P0.24 GPIO0, digital only.
63 RGBG GREEN IO P0.14 Green pin of the RGB LED.
64 D23 GPIO1 IO P1.9 GPIO1, digital only.
65 RGBB BLUE IO P0.15 Blue pin of the RGB LED.
66 D4 PWM0 IO P1.8 SPI1 MISO, Digital only GPIO, and PWM0.
67 SIM_VCC1 SOM53 POWER Leave unconnected, 1.8V/3V SIM Supply Output from cellular modem.
68 D5 PWM1 IO P1.10 Digital only GPIO, and PWM1.
69 SIM_RST1 SOM63 IO Leave unconnected, 1.8V/3V SIM Reset Output from cellular modem.
70 D6 PWM2 IO P1.11 Digital only GPIO, and PWM2.
71 SIM_CLK1 SOM73 IO Leave unconnected, 1.8V/3V SIM Clock Output from cellular modem.
72 D7 PWM3 IO P1.12 Digital only GPIO, and PWM3.
73 SIM_DATA1 SOM83 IO Leave unconnected, 1.8V/3V SIM Data I/O of cellular modem with internal 4.7 k pull-up.
74 u-blox VBUS SOM23 IO USB detect pin for cellular modem. 5V on this pin enables the u-blox USB interface.
75 NC SOM93 NC Leave unconnected.

1These pins are connected to the internal MFF2 SIM and should be left open.

2A0-A7 are 12-bit Analog-to-Digital (A/D) inputs (0-4095).

3SoM-specific and Reserved pins will vary depending on module. They are able to be used on the B402, but their function may be be different on future modules.

By default, the Tinker application firmware enables the use of the bq24195 PMIC and MAX17043 fuel gauge. This in turn uses I2C (D0 and D1) and pin A6 (PM_INT). If you are not using the PMIC and fuel gauge and with to use these pins for other purposes, be sure to disable system power configuration. This setting is persistent, so you may want to disable it with your manufacturing firmware only.

System.setPowerConfiguration(SystemPowerConfiguration());

If you are using Ethernet with the B Series SoM, the following pins are used by Ethernet:

Device OS Pin M.2 Pin Ethernet Pin
MISO 50 SPI MISO
MOSI 52 SPI MOSI
SCK 54 SPI SCK
A7 47 nRESET
D22 62 nINTERRUPT
D8 48 nCHIP SELECT

LED status

System RGB LED

Unlike the Boron, the B402 module does not have an on-module RGB system status LED. We have provided its individual control pins for you to connect an LED of your liking. This will allow greater flexibility in the end design of your products.

A detailed explanation of different color codes of the RGB system LED can be found here.

Technical specifications

Absolute maximum ratings [1]

Supply voltages

Parameter Symbol Min Typ Max Unit
Supply voltages
Supply Input Voltage VCC -0.3 +6.0 V
Supply Input Voltage 3V3 -0.3 +3.9 V
VBUS USB supply voltage VUSB -0.3 +5.8 V
I/O pin voltage
VI/O, VDD ≤ 3.6 V IO -0.3 VDD + 0.3 V
VI/O, VDD > 3.6 V IO -0.3 +3.9 V
NFC antenna pin current
INFC1/2 NFC1/NFC2 80 mA
Radio
BT RF input level (52840) 10 dBm
Environmental
Storage temperature -40 +85 °C

[1] Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Parameter Symbol Min Typ Max Unit
Supply voltages
Supply Input Voltage VCC +3.6 +3.8 +4.2 V
Supply Input Voltage 3V3 +3.0 +3.3 +3.6 V
VBUS USB supply voltage VUSB +4.35 +5.0 +5.5 V
Environmental
Normal operating temperature1 -20 +25 +65 °C
Extended operating temperature2 -40 +85 °C
Humidity Range Non condensing, relative humidity 95 %

Notes:

1 Normal operating temperature range (fully functional and meet 3GPP specifications).

2 Extended operating temperature range (RF performance may be affected outside normal operating range, though module is fully functional)


Power consumption

Values are from B404/B402. Actual operating current with cellular using the R510 modem may vary but should be similar.

Parameter Symbol Min Typ Peak Unit
Operating Current (uC on, peripherals and radio disabled) Iidle 4.48 4.71 5.17 mA
Operating Current (uC on, cellular on but not connected) Icell_idle 5.1 45.2 166 mA
Operating Current (uC on, cellular connecting to tower) Icell_conn_twr 13.7 56.0 192 mA
Operating Current (uC on, cellular connecting to cloud) Icell_conn_cloud 63.2 185 mA
Operating Current (uC on, cellular connected but idle) Icell_cloud_idle 13.4 15.5 98.3 mA
Operating Current (uC on, cellular connected and transmitting) Icell_cloud_tx 9.47 66.3 192 mA
STOP mode sleep, GPIO wake-up Istop_gpio 552 555 559 uA
STOP mode sleep, analog wake-up Istop_analog 554 557 559 uA
STOP mode sleep, RTC wake-up Istop_intrtc 553 556 558 uA
STOP mode sleep, BLE wake-up, advertising Istop_ble_adv 631 2650 uA
STOP mode sleep, BLE wake-up, connected Istop_ble_conn 47.3 630 1540 uA
STOP mode sleep, serial wake-up Istop_usart 553 556 558 uA
STOP mode sleep, cellular wake-up Istop_cell 8.87 9.65 63.6 mA
ULP mode sleep, GPIO wake-up Iulp_gpio 44.7 47.6 49.6 uA
ULP mode sleep, analog wake-up Iulp_analog 45.0 47.8 49.5 uA
ULP mode sleep, RTC wake-up Iulp_intrtc 43.4 46.4 47.9 uA
ULP mode sleep, BLE wake-up, advertising Iulp_ble_adv 130 2560 uA
ULP mode sleep, BLE wake-up, connected Iulp_ble_conn 121 1010 uA
ULP mode sleep, serial wake-up Iulp_usart 554 557 559 uA
ULP mode sleep, cellular wake-up Iulp_cell 0.37 9.47 53.7 mA
HIBERNATE mode sleep, GPIO wake-up Ihib_gpio 23.6 26.0 29.7 uA
HIBERNATE mode sleep, analog wake-up Ihib_analog 23.9 26.5 30.5 uA

1The min, and particularly peak, values may consist of very short transients. The typical (typ) values are the best indicator of overall power consumption over time. The peak values indicate the absolute minimum capacity of the power supply necessary, not overall consumption.


Radio specifications

The B Series SoM has two radio modules.

nRF52840

  • Bluetooth® 5, 2.4 GHz
    • 95 dBm sensitivity in 1 Mbps Bluetooth® low energy mode
    • 103 dBm sensitivity in 125 kbps Bluetooth® low energy mode (long range)
    • 20 to +8 dBm TX power, configurable in 4 dB steps

u-blox SARA-R510S-01B

Parameter Value FCC Certified
Protocol stack 3GPP Release 14
RAT LTE Cat M1 Half-Duplex
LTE FDD Bands Band 71 (600 MHz)  
Band 12 (700 MHz)
Band 28 (700 MHz)
Band 85 (700 MHz)  
Band 13 (750 MHz)
Band 20 (800 MHz)
Band 5 (850 MHz)
Band 18 (850 MHz)  
Band 19 (850 MHz)  
Band 26 (850 MHz)  
Band 8 (900 MHz)
Band 4 (1700 MHz)
Band 3 (1800 MHz)
Band 2 (1900 MHz)
Band 25 (1900 MHz)  
Band 1 (2100 MHz)  
Power class Class 3 (23 dBm)  
  • LTE Cat M1 for United States, Canada, and Mexico
  • Not all bands are enabled in software by default.
  • FCC Certification in the United States only tests bands in use in the United States.
  • Particle LTE Cat M1 devices are not certified for use in Europe or other countries that follow EU certification requirements.

I/O Characteristics

These specifications are based on the nRF52840 datasheet.

Symbol Parameter Min Typ Max Unit
VIH Input high voltage 0.7 xVDD VDD V
VIL Input low voltage VSS 0.3 xVDD V
VOH,SD Output high voltage, standard drive, 0.5 mA, VDD ≥1.7 VDD - 0.4 VDD V
VOH,HDH Output high voltage, high drive, 5 mA, VDD >= 2.7 V VDD - 0.4 VDD V
VOH,HDL Output high voltage, high drive, 3 mA, VDD >= 1.7 V VDD - 0.4 VDD V
VOL,SD Output low voltage, standard drive, 0.5 mA, VDD ≥1.7 VSS VSS + 0.4 V
VOL,HDH Output low voltage, high drive, 5 mA, VDD >= 2.7 V VSS VSS + 0.4 V
VOL,HDL Output low voltage, high drive,3 mA, VDD >= 1.7 V VSS VSS + 0.4 V
IOL,SD Current at VSS+0.4 V, output set low, standard drive, VDD≥1.7 1 2 4 mA
IOL,HDH Current at VSS+0.4 V, output set low, high drive, VDD >= 2.7V 6 10 15 mA
IOL,HDL Current at VSS+0.4 V, output set low, high drive, VDD >= 1.7V 3 mA
IOH,SD Current at VDD-0.4 V, output set high, standard drive, VDD≥1.7 1 2 4 mA
IOH,HDH Current at VDD-0.4 V, output set high, high drive, VDD >= 2.7V 6 9 14 mA
IOH,HDL Current at VDD-0.4 V, output set high, high drive, VDD >= 1.7V 3 mA
tRF,15pF Rise/fall time, standard drivemode, 10-90%, 15 pF load1 9 ns
tRF,25pF Rise/fall time, standard drive mode, 10-90%, 25 pF load1 13 ns
tRF,50pF Rise/fall time, standard drive mode, 10-90%, 50 pF load1 25 ns
tHRF,15pF Rise/Fall time, high drive mode, 10-90%, 15 pF load1 4 ns
tHRF,25pF Rise/Fall time, high drive mode, 10-90%, 25 pF load1 5 ns
tHRF,50pF Rise/Fall time, high drive mode, 10-90%, 50 pF load1 8 ns
RPU Pull-up resistance 11 13 16
RPD Pull-down resistance 11 13 16
CPAD Pad capacitance 3 pF
CPAD_NFC Pad capacitance on NFC pads 4 pF
INFC_LEAK Leakage current between NFC pads when driven to different states 1 10 μA
  • Rise and fall times based on simulations

  • GPIO default to standard drive (2mA) but can be reconfigured to high drive (9mA) in Device OS 2.0.0 and later using the pinSetDriveStrength() function.

Mechanical specifications

Dimensions and Weight

Parameters Value Unit
Width 30 mm
Height 42 mm
Thickness 5.5 mm
Weight 6.2 grams

Mechanical drawing

Mechanical Drawing

Dimensions are in millimeters.


Mating connector and land pattern

The mating connector is a an M.2 (NGFF) type 4. Note that there are several different key configurations for the M.2, and type 4 is different than is commonly used on SSDs.

One compatible connector is the TE 2199230-4. It is widely available including at suppliers such as DigiKey.

M.2 Connector

Screw Assembly

The M.2 SoM requires a screw to hold the SoM in place because the M.2 connector does not have integrated locks and the SoM will pop up if not attached to the base board. The screw also provides better vibration resistance than locking clips.

  • This is one style of standoff.

Screw Assembly

Design Considerations

We strongly recommend against placing components under the SOM board because there is not enough height.

Keep-Out Area

Product Handling

ESD Precautions

The B series contains highly sensitive electronic circuitry and is an Electrostatic Sensitive Device (ESD). Handling an B series without proper ESD protection may destroy or damage it permanently. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application that incorporates the B series module. ESD precautions should be implemented on the application board where the B series is mounted. Failure to observe these precautions can result in severe damage to the B series!

Connectors

The U.FL antenna connector is not designed to be constantly plugged and unplugged. The antenna pin is static sensitive and you can destroy the radio with improper handling. A tiny dab of glue (epoxy, rubber cement, liquid tape or hot glue) on the connector can be used securely hold the plug in place.

The M.2 edge connector is static sensitive and should be handled carefully. The M.2 connector is not designed for repeated removal and insertion of the module.

Schematics

Microcontroller

Microcontroller

u-blox cellular modem

u-blox cellular modem

M.2 connector

M.2 Connector

SIM and Flash

SIM and Flash

Default settings

The B series comes pre-programmed with a bootloader and a user application called Tinker. This application works with an iOS and Android app also named Tinker that allows you to very easily toggle digital pins, take analog and digital readings and drive variable PWM outputs.

The bootloader allows you to easily update the user application via several different methods, USB, OTA, Serial Y-Modem, and also internally via the Factory Reset procedure. All of these methods have multiple tools associated with them as well.


FCC IC CE Warnings and End Product Labeling Requirements

Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

  1. This device may not cause harmful interference, and
  2. This device must accept any interference received, including interference that may cause undesired operation.

FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This transmitter module must not be co-located or operating in conjunction with any other antenna or transmitter. This End equipment should be installed and operated with a minimum distance of 20 centimeters between the radiator and your body.

IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.

End Product Labeling The final end product must be labeled in a visible area with the following:

  • Contains FCC ID: 2AEMI-B404X

Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.


Canada Statement This device complies with Industry Canada’s licence-exempt RSSs. Operation is subject to the following two conditions:

  1. This device may not cause interference; and
  2. This device must accept any interference, including interference that may cause undesired operation of the device.

Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence.

L’exploitation est autorisée aux deux conditions suivantes:

  1. l’appareil ne doit pas produire de brouillage;
  2. l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le fonctionnement.

Caution Exposure: This device meets the exemption from the routine evaluation limits in section 2.5 of RSS102 and users can obtain Canadian information on RF exposure and compliance. Le dispositif répond à l'exemption des limites d'évaluation de routine dans la section 2.5 de RSS102 et les utilisateurs peuvent obtenir des renseignements canadiens sur l'exposition aux RF et le respect.

The final end product must be labelled in a visible area with the following: The Industry Canada certification label of a module shall be clearly visible at all times when installed in the host device, otherwise the host device must be labelled to display the Industry Canada certification number of the module, preceded by the words “Contains transmitter module”, or the word “Contains”, or similar wording expressing the same meaning, as follows:

  • Contains transmitter module IC: 20127-B404X

This End equipment should be installed and operated with a minimum distance of 20 centimeters between the radiator and your body. Cet équipement devrait être installé et actionné avec une distance minimum de 20 centimètres entre le radiateur et votre corps.

The end user manual shall include all required regulatory information/warning as shown in this manual.


Country compatibility

Country Model Technologies Carriers
Canada B404 M1 Bell Mobility, Rogers Wireless, Telus
Mexico B404 M1 AT&T
United States B404 M1 AT&T

Ordering information

SKU Description Region Modem EtherSIM Lifecycle Replacement
B404XMEA B Series LTE CAT-M1 (NorAm), [x1] NORAM R510 In development
B404XMTY B Series LTE CAT-M1 (NorAm), Tray [x50] NORAM R510 In development

Revision history

Revision Date Author Comments
018 2022-08-29 RK Split out from B404 and B402
019 2022-09-06 RK Update certified cellular antenna
020 2022-09-07 RK Add additional port and pin information
021 2022-09-16 RK Added FCC and IC ID
022 2022-09-16 RK Fix minimum Device OS version, is 4.0.0
023 2022-09-26 RK Added FCC and IC labeling requirements