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Embedded Planet, Inc.
12.2.
Power | Battery Charging
The epConnected Asset device includes a battery charger capable of charging lithium batteries in the 1SxP
configuration. The designated charge manager for this role is the Microchip MCP73831 (U4). The input voltage
range for the battery charger U4 is 3.75Vdc to 5.5Vdc. This voltage comes in from USB connector J2 and/or the
alternate through-holes next to it (see the "Power | USB Connector" section for more detail). For the
epConnected Asset device the charge current limit is set to 500mA, and the charge termination voltage is set to
4.2V. The epConnected Asset device is designed to run off battery power; the USB connector is for battery
charging while the JST connector is for powering the device during operation. More on the Microchip
MCP73831 can be found at
U4: Battery charge
manager
12.3.
Power | Battery Monitor
The epConnected Asset includes a battery voltage monitor that is connected to an ADC input (AIN0) on the
nRF52840. This allows the system to monitor the battery voltage and react to battery voltage levels and/or
changes. The low-power monitor circuit (DMC2400UV, Q1) is enabled by setting P1.11 high, while the battery
voltage (VBAT) is scaled to 50% and connected to AIN0.
12.4.
Power | USB Connector
A standard micro-B USB connector (J2) is used for battery charging (using standard USB 5V) and data transfer.
Two through-hole connections are provided for the charger input if the USB connector is not required or desired.
J2 USB connector
for battery charging
& data transfer
J2 through-hole
connections for
battery charging
Embedded Planet, Inc. | 31225 Bainbridge Rd Suite N, Solon, OH 44139 | 216-245-4180 | www.embeddedplanet.com | Page 19 of 37
epConnected Asset | Product User Manual
https://www.microchip.com/en-us/product/MCP73831
Document Version: 1.0.0 | 26 Jan 22
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