Silicon Laboratories EM3585, User Manual, Page: 7 / 25

EM358x
Rev 1.0 7
Table 6.1. EM358x Pin Descriptions
Pin # Signal Direction Description
1 VDD_24MHZ Power 1.8 V high-frequency oscillator supply
2 VDD_VCO Power 1.8 V VCO supply
3 RF_P I/O Differential (with RF_N) receiver input/transmitter output
4 RF_N I/O Differential (with RF_P) receiver input/transmitter output
5 VDD_RF Power 1.8 V RF supply (LNA and PA)
6 RF_TX_ALT_P O Differential (with RF_TX_ALT_N) transmitter output (optional)
7 RF_TX_ALT_N O Differential (with RF_TX_ALT_P) transmitter output (optional)
8 VDD_IF Power 1.8 V IF supply (mixers and filters)
9 NC Do not connect
10 VDD_PADSA Power Analog pad supply (1.8 V)
11 PC5 I/O Digital I/O
TX_ACTIVE O Logic-level control for external RX/TX switch. The EM358x baseband con-
trols TX_ACTIVE and drives it high (VDD_PADS) when in TX mode.
Select alternate output function with GPIO_PCCFGH[7:4]
12 nRESET I Active low chip reset (internal pull-up)
13 PC6 I/O Digital I/O
OSC32B I/O 32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[11:8]
nTX_ACTIVE O Inverted TX_ACTIVE signal (see PC5)
Select alternate output function with GPIO_PCCFGH[11:8]
14 PC7 I/O Digital I/O
OSC32A I/O 32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[15:12]
OSC32_EXT I Digital 32.768 kHz clock input source
15 VREG_OUT Power Regulator output (1.8 V while awake, 0 V during deep sleep)
16 VDD_PADS Power Pads supply (2.1–3.6 V)
17 VDD_CORE Power 1.25 V digital core supply decoupling
Note:
1.
IRQC and IRQD external interrupts can be mapped to any digital I/O pin using the GPIO_IRQCSEL and
GPIO_IRQDSEL registers.