ST STEVAL-WESU1, User Manual, Page: 10 / 22

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10/22
Version 0.1 STMicroelectronics Confidential
DRAFT
The SYS pin is the voltage output of STNS01 selected power path. That SYS pin is
connected to the linear voltage regulator STLQ015XG30R that provide a 3V (VDD) to all
other devices.
The STM32L151 is also connected to its SHDN pin to disconnect the power delivery to
most of the devices and enable the shipment mode.
2.4.2 STC3115
The STC3115 includes the hardware functions required to implement a low-cost gas gauge
for battery monitoring. The STC3115 uses current sensing, Coulomb counting and accurate
measurements of the battery voltage to estimate the state-of-charge (SOC) of the battery.
An internal temperature sensor simplifies implementation of temperature compensation.
An alarm output signals a low SOC condition and can also indicate low battery voltage. The
alarm threshold levels are programmable.
The STC3115 offers advanced features to ensure high performance gas gauging in all
application conditions.
2.5 Connectors
The following sub-sections describe the connectors of STEVAL-WESU1 board (see
Figure 4 as reference). The STEVAL-WESU1
has “L” form factor (see Figure 4), suitable
to host the battery (i.e. 12xd25mm @ 85 mAh) in plane with the PCB and optimize the
final design.
Figure 5 Photo of STEVAL-WESU1 with Battery
2.5.1 Battery connector
Battery connector is placed on the shrink side of the board (see Figure 2). Its hardware
connection is shown in Figure 6
Figure 6 Battery connector Schematic