The B404 and B402 have been deprecated. The recommended replacement is the B404X.
See the Supply Secure FAQ for more information.
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 microcontroller.
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.
- u-blox SARA-R410M-02B or R410M-03 LTE modem (B402, B404)
- The B402 and B404 have been deprecated, replacement is the B404X. See the Supply Secure FAQ for more information.
- LTE Cat M1 module
- Support for United States, Canada, and Mexico only
- 3GPP Release 13 LTE Cat M1
- Cat M1 bands: 2, 3, 4, 5, 8, 12, 13, 20, 28
- Embedded Particle EtherSIM (B404)
- Embedded Particle SIM (B402)
1 Not all bands enabled in software by default
- 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)
It is recommended that you use the latest version in the 4.x LTS release line with the B404 and B402.
B404X devices requires a minimum of Device OS 4.0.0. If you have a mixed fleet of B404X, B404, and/or B402 devices, we recommend upgrading all device to the latest 4.x LTS release.
Recent B404 devices require Device OS 2.3.0 or later due to a required component change.
While older B404 devices and B402 devices can use earlier versions, we recommend that all B404 and B404 fleets use a minimum of 2.3.0 and recommend 4.x LTS. The 2.x LTS release line is in the Extended Support and Maintenance (ESM) window and will stop being supported in 2024.
VCC is used to supply power to the u-blox SARA-R410M cellular module. The recommended input voltage range on this pin is between 3.6V to 4.2V DC. This can be connected directly to a 3.7V LiPo battery.
If you are not using a battery, or using a battery of a different voltage, you should use a regulator to supply 3.7V to 4.2V. While you only need 600mA for the B402/B404/B404X, we recommend 2A for compatibility with future SoM modules.
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 a minimum of 150 mA, however we recommend a minimum of 500 mA supplied from your base board to allow for compatibility with future modules.
These limits do not include any 3.3V peripherals on your base board, so that may increase the current requirements.
Power supply requirements:
- 3.3V output
- Maximum 5% voltage drop
- 100 mV peak-to-peak ripple maximum
- 500 mA minimum output current at 3.3V recommended for future compatibility
- Maintain these values at no-load as well as maximum load
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.
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.
|ANTCW2EA||Particle Cellular Flex Antenna 2G/3G/LTE [x1]|
|ANTCW2TY||Particle Cellular Flex Antenna 2G/3G/LTE Tray of 50 [x50]|
- Type: LTE Ultra Wide Band Flex Antenna
- Frequency/band: 698 MHz-2690 MHz
- RoHS Compliant
- Mechanical Specs:
- Dimensions: 97 x 21 x 0.2 mm
- Mounting: 3M adhesive backed for application on non-metallic surfaces
- Connector type: FPC + IPEX connector
- Cable length: 210 mm
- Gain: 4.71 dBi
- 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.
|Peripheral Type||Qty||Input(I) / Output(O)|
|Analog (ADC)||8 (max)||I|
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.
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.
- 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)
- OTA (1500KB, @0x00289000)
- Reserved (420KB, @0x00220000)
- FAC (128KB, @0x00200000)
- LittleFS (2M, @0x00000000)
RESERVED and SOM pins may vary across different SoM models. If you are designing for this specific module, or similar modules, you can use the indicated functions even if the pin is marked RESERVED. Most nRF52840-based modules will have the same pin functions on the RESERVED pins
Future modules with a different MCU may have different pin functions. An effort will be made to assign all of the listed functions for ADC, PWM, SPI, etc. from the set of common SoM pin functions in future modules, but the functions on RESERVED and SOM pins will likely vary.
|2||VCC||VCC||POWER||System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.|
|4||VCC||VCC||POWER||System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.|
|6||VCC||VCC||POWER||System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.|
|8||VCC||VCC||POWER||System power in, connect to the +LiPo or supply a fixed 3.6-4.2v power.|
|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.|
|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||P0.09||NFC antenna connection.|
|19||NFC2||SOM43||NFC input||P0.10||NFC antenna connection.|
|20||D1||SCL||IO||P0.27||I2C SCL, and digital only GPIO.|
|22||D0||SDA||IO||P0.26||I2C SDA, and digital only GPIO.|
|23||A0||ADC0||IO||P0.03||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||P0.04||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||P0.06||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||P1.01||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||P1.02||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||P0.05||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||P0.02||Analog input ADC72, and digital GPIO.|
|48||D8||CS||IO||P1.03||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.|
|52||D12||MOSI||IO||P1.13||SPI interface MOSI, and digital only GPIO.|
|54||D13||SCK||IO||P1.15||SPI interface SCK, and digital only GPIO.|
|56||GND||GND||POWER||System analog ground.|
|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||P1.09||GPIO1, digital only.|
|65||RGBB||BLUE||IO||P0.15||Blue pin of the RGB LED.|
|66||D4||PWM0||IO||P1.08||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.|
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.
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|
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.
When using the B Series SoM with a bq24195 PMIC, note the following:
By default, the bq24195 sets the input current limit, which affects powering by VIN and VUSB, to 100 mA. This affects the VSYS output of the PMIC, which powers both the cellular modem and 3V3 supply, and is not enough to power the B Series SoM in normal operation.
If your device has the default firmware (Tinker), it will attempt to connect to the cloud, brown out due to insufficient current, then the device will reset. This may result in what appears to be the status LED blinking white, but is actually rolling reboot caused by brownout.
A factory new B Series SoM does not enable the PMIC setup. To enable the use of the bq21415, you must enable the system power feature PMIC_DETECTION in your code. This defaults to off because the B Series SoM can be used without a PMIC, or with a different PMIC, and also requires I2C on D0/D1, and some base boards may use those pins as GPIO.
Because the input current limit does not affect the battery input (Li+), for troubleshooting purposes it can be helpful to attach a battery to help rule out input current limit issues. It's also possible to supply 3.7V via a bench power supply to the battery input, instead of VIN.
The input current limit can result in a situation where you can't bring up a B Series SoM because it browns out continuously, but also cannot flash code to it to stop if from browning out. There are two general solutions:
- Attach a battery or supply by Li+ when bringing up a board.
- Use SWD/JTAG and reset halt the MCU. This will prevent it from connecting to the cloud, so you can flash Device OS and firmware to it by SWD.
The input current limit is actually controlled by three factors:
- The power source max current setting in the PMIC. The default is 900 mA. It can be set to 100, 150, 500, 900, 1200, 1500, 2000, or 3000 mA.
- It is also limited by the hardware ILIM resistor. On Particle devices with a built-in PMIC, this is set to 1590 mA, but if you are implementing your own PMIC hardware, you can adjust this higher.
- When connected by USB, it will use DPDM, current negotiation via the USB DP (D+) and DM (D-) lines.
Note that some 2A tablet chargers and multi-port USB power supplies supply 2A but do not implement DPDM; these will be treated as if VIN was used, and you must set the power source current, otherwise the input current will be limited to 900 mA, which is not enough to power a 2G/3G cellular modem without an attached battery.
|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|
|BT RF input level (52840)||10||dBm|
 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.
|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|
|Normal operating temperature1||-20||+25||+65||°C|
|Extended operating temperature2||-40||+85||°C|
|Humidity Range Non condensing, relative humidity||95||%|
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)
|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.
The B Series SoM has two radio modules.
- 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
|Protocol stack||3GPP Release 13|
|RAT||LTE Cat M1 Half-Duplex|
|LTE FDD Bands||Band 12 (700 MHz)|
|Band 28 (700 MHz)|
|Band 13 (750 MHz)|
|Band 20 (800 MHz)|
|Band 5 (850 MHz)|
|Band 8 (900 MHz)|
|Band 4 (1700 MHz)|
|Band 3 (1800 MHz)|
|Band 2 (1900 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.
- Particle LTE Cat M1 devices are not certified for use in Europe or other countries that follow EU certification requirements.
These specifications are based on the nRF52840 datasheet.
|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|
|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
Dimensions are in millimeters.
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.
We recommend this screw assembly to securely affix the B series SoM to your circuit board. From top to bottom:
- M3 screw, 3mm long
- M3 washer
- M3 standoff, 2.45mm
- Mounting hole, 2.6 mm metal hole, 3.1mm metal ring diameter (picture is of the bottom side of the circuit board)
Note that a hold-down screw is required because the M.2 connector does not have integrated locks and the SoM will pop up if not attached to the base board.
We strongly recommend against placing components under the SOM board because there is not enough height.
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!
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.
Note: The labels for CTS and RTS are reversed in this schematic.
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.
|Canada||B404||M1||Bell Mobility, Rogers Wireless, Telus|
|B402MEA||B Series LTE CAT-M1 (NorAm), [x1]||NORAM||R410||NRND||B404MEA|
|B404MEA||B Series LTE CAT-M1 (NorAm, EtherSIM), [x1]||NORAM||R410||✓||NRND|
|B402MTY||B Series LTE CAT-M1 (NorAm), Tray [x50]||NORAM||R410||Deprecated||B404MTY|
|B404MTY||B Series LTE CAT-M1 (NorAm, EtherSIM), Tray [x50]||NORAM||R410||✓||Deprecated|
|001||29 Apr 2019||RK||Initial Release|
|002||03 Feb 2020||RK||Fixed number of I2C, SPI, and PWM|
|003||18 Feb 2020||RK||Keep-out diagram M.2 connector was upside-down|
|004||16-Sep-2020||RK||Added power consumption information|
|005||16-Dec-2020||RK||Added missing TBD power consumption values|
|006||04-Jan-2021||RK||Fix incorrect pin number on pogo pin diagram|
|007||03-Feb-2021||RK||Split u-blox schematics into two images|
|008||15-Mar-2021||RK||Updated model, carrier, ordering information|
|009||23-Mar-2021||RK||Pins 40 and 42 functions were reversed|
|010||26-Apr-2021||RK||Added B404 model number|
|011||14-May-2021||RK||Pins 40 and 42 were not actually reversed|
|012||19-May-2021||RK||List Ethernet reserved pins|
|013||28-Jun-2021||RK||Added Device OS 3.1 memory map information|
|014||10-Sep-2021||RK||Changed wording of peak vs. max current|
|015||14-Mar-2022||RK||Added B404X, deprecation notice|
|016||05-May-2022||RK||Corrected number of PWM outputs (8)|
|017||11-Aug-2022||RK||Correct typo in 3V3 explanation|
|018||29-Aug-2022||RK||Split out B404X into separate datasheet|
|019||10-Dec-2022||RK||Added PMIC notes|
|020||06-Jan-2023||RK||Clarify power supply notes for VCC and 3V3|
|021||31-Jan-2023||RK||Add Device OS versions|