STWBC2-HP datasheet(7/96 Pages) STMICROELECTRONICS

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Figure 5. Power management

The on-board DC-DC BUCK converter provides VDD supply voltage starting from external VIN DC source. VDD

voltage is available on the external pin and supplies the internal voltage regulators LDO 3V3 and LDO 1V8. Both

outputs of these regulators are available on the external pin as shown in Figure 5.

LDO 3V3 provides supply voltage for STM32G071 (internal bonding connection), for analog low-voltage circuits

on STWBC2-HP AFE and finally for the level shift stages (from 1.8 V up to 3.3 V) used to interface digital signal

between the STWBC2-HP (1.8 V digital domain) and the STM32G071 (3.3 V digital domain).

LDO 1V8 provides supply voltage for STWBC2-HP AFE digital core and for input stage of the level shifter blocks

mentioned before.

2.1.2

Reset strategy

The STWBC2-HP includes a single NRST pin that is star-connected to both AFE and STM32G071; both STM32

and AFE use bi-directional pad for NRST. The following figure shows the simplified schematic of NRST function

implementation.

For STM32G071 the NRST pin function is:

•

Reset input

•

Warm reset output from WDG, SW reset, …

For AFE the NRST pin function is:

•

Reset input

•

Power ON Reset in link with BUCK DC-DC startup and LDOs startup.

STWBC2-HP

Analog AFE functions

DS13825 - Rev 1.0

page 7/96

STWBC2-HP Datasheet(PDF) 7 Page - STMicroelectronics