STM32W108HB datasheet(17/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

Pinout and pin description

Doc ID 16252 Rev 14

17/278

VDD_PADSA

Power

Analog pad supply (1.8V)

PC5

I/O

Digital I/O

TX_ACTIVE

Logic-level control for external Rx/Tx switch. The

STM32W108 baseband controls TX_ACTIVE and drives it

high (VDD_PADS) when in Tx mode.

Select alternate output function with GPIOC_CRH[7:4]

nRESET

Active low chip reset (internal pull-up)

PC6

I/O

Digital I/O

OSC32_IN

I/O

32.768 kHz crystal oscillator

Select analog function with GPIOC_CRH[11:8]

nTX_ACTIVE

Inverted TX_ACTIVE signal (see PC5)

Select alternate output function with GPIOC_CRH[11:8]

PC7

I/O

Digital I/O

OSC32_OUT

I/O

32.768 kHz crystal oscillator.

Select analog function with GPIOC_CRH[15:12]

OSC32_EXT

Digital 32 kHz clock input source

VREG_OUT

Power

Regulator output (1.8 V while awake, 0 V during deep sleep)

VDD_PADS

Power

Pads supply (2.1-3.6 V)

VDD_CORE

Power

1.25 V digital core supply decoupling

PA7

I/O

High

current

Digital I/O. Disable REG_EN with GPIO_DBGCR[4]

TIM1_CH4

Timer 1 Channel 4 output

Enable timer output with TIM1_CCER

Select alternate output function with GPIOA_CRH[15:12]

Disable REG_EN with GPIO_DBGCR[4]

Timer 1 Channel 4 input. (Cannot be remapped.)

REG_EN

External regulator open drain output. (Enabled after reset.)

Table 2.

Pin descriptions (continued)

48-Pin

Package

Pin no.

40-Pin

Package

Pin no.

Signal

Direction

Description

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