EM357-RTR datasheet(6/240 Pages) ETC2

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EM351 / EM357

Table 1-1. EM35x Pin Descriptions

Pin #

Signal

Direction

Description

VDD_24MHZ

Power

1.8 V high-frequency oscillator supply

VDD_VCO

Power

1.8 V VCO supply

RF_P

I/O

Differential (with RF_N) receiver input/transmitter output

RF_N

I/O

Differential (with RF_P) receiver input/transmitter output

VDD_RF

Power

1.8 V RF supply (LNA and PA)

RF_TX_ALT_P

Differential (with RF_TX_ALT_N) transmitter output (optional)

RF_TX_ALT_N

Differential (with RF_TX_ALT_P) transmitter output (optional)

VDD_IF

Power

1.8 V IF supply (mixers and filters)

Do not connect

VDD_PADSA

Power

Analog pad supply (1.8 V)

PC5

I/O

Digital I/O

TX_ACTIVE

Logic-level control for external Rx/Tx switch. The EM35x baseband

controls TX_ACTIVE and drives it high (VDD_PADS) when in Tx mode.

Select alternate output function with GPIO_PCCFGH[7:4]

nRESET

Active low chip reset (internal pull-up)

PC6

I/O

Digital I/O

OSC32B

I/O

32.768 kHz crystal oscillator

Select analog function with GPIO_PCCFGH[11:8]

nTX_ACTIVE

Inverted TX_ACTIVE signal (see PC5)

Select alternate output function with GPIO_PCCFGH[11:8]

PC7

I/O

Digital I/O

OSC32A

I/O

32.768 kHz crystal oscillator

Select analog function with GPIO_PCCFGH[15:12]

OSC32_EXT

Digital 32.768 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_DBGCFG[4]

TIM1C4

Timer 1 Channel 4 output

Enable timer output with TIM1_CCER

Select alternate output function with GPIO_PACFGH[15:12]

Disable REG_EN with GPIO_DBGCFG[4]

TIM1C4

Timer 1 Channel 4 input

Cannot be remapped

REG_EN

External regulator open drain output

Enabled after reset

PB3

I/O

Digital I/O

1-2

120-035X-000D

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