PM-BAT power module datasheet

Overview

The Particle PM-BAT power module is a small module that contains:

• 5V to 17VDC input
• 3.3V regulated output for MCU (2A)
• 3.9V output for cellular modem (2A)
• bq24195 PMIC (power management and charge controller)
• MAX17043 fuel gauge (LiPo battery charge sensor)

It can either be:

• A castellated module intended to be reflow soldered to your M.2 SoM base board
• A module with male pins on the bottom that can be plugged into a socket on your M.2 SoM base board

The PM-DC power module is also available if you do not need battery support and want to power from an external DC source.

Block diagram

Dimensions

Dimensions in mm

• Module is 35mm x 22.86mm (1.38" x 0.9")
• Pins and castellated holes are 2.54mm (0.1") apart

Pinout

3V3_AUX is powered by 3V3 via a load switch (TPS22918). It can supply up to the full 2A of 3V3. It defaults to off due to a pull-down resistor on the pin. Pull to 3V3 to enable the 3V3_AUX output.

The I2C connection is required; the module will not operate correctly without configuration by I2C to adjust the input current limit and other settings.

The /FUEL_INT is an open-drain output that goes low if the PMIC or fuel gauge chip signals an interrupt condition. This should be connected to M.2 SoM pin 45 (A6) for both B-SoM and M-SoM. On the M-SoM, pin A6 pin cannot wake the M-SoM from hibernate sleep mode, but can wake from stop or ULP sleep modes.

Land pattern (SMD)

Dimensions in mm

Pin layout

Dimensions in mm

• Male header pins are 0.1" spacing, 12 or 13 pins per side
• Two rows, spaced 0.8" (20.32mm) apart

The mating header is available from a large number of suppliers in both PTH and SMD styles.

Schematic

Battery temperature sensor

The power module PM-BAT can work with or without a battery temperature sensor.

Without a temperature sensor

Leave the power module TS pin unconnected. Charging will always be enabled in hardware, but you can still control charging in software if you wish to do so.

With a temperature sensor

Connect the power module TS pin to a voltage divider as shown here:

The values for your resistors can be used to control the charge temperature range using the calculator tool below.

Calculator

When calculating based on resistance, this formula from the bq24195 datasheet is used:

This graph shows the relationship between V_LTF, V_HTF, and V_TCO. Note that since the thermistor is NTC (negative temperature coefficient), higher voltages indicate lower temperatures.

Ordering information

Version history