EM3595-RTR datasheet(38/59 Pages) SILABS

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EM359x

Rev 1.0

Table 6.1. EM359x Pin Descriptions

Pin #

Signal

Direction

Description

OSCA

I/O

24 MHz crystal oscillator or external clock input.

(An external clock input should only be used for test and debug purposes.

If used in this manner, the external clock input should be a 1.8 V, 50% duty

cycle, square wave.)

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 EM359x baseband con-

trols 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)

Note:

IRQC and IRQD external interrupts can be mapped to any digital I/O pin using the GPIO_IRQCSEL and

GPIO_IRQDSEL registers.

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