EM357-RTR Datasheet, PDF (212/241 Pages) Silicon Laboratories – High-Performance, Integrated ZigBee/802.15.4 System-on-Chip

Table 19.1. EM35x 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
12
nRESET
O
Logic-level control for external RX/TX switch. The EM35x baseband con-
trols TX_ACTIVE and drives it high (VDD_PADS) when in TX mode.
Select alternate output function with GPIO_PCCFGH[7:4]
I
Active low chip reset (internal pull-up)
13
PC6
I/O Digital I/O
OSC32B
nTX_ACTIVE
14
PC7
I/O 32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[11:8]
O
Inverted TX_ACTIVE signal (see PC5)
Select alternate output function with GPIO_PCCFGH[11:8]
I/O Digital I/O
OSC32A
OSC32_EXT
I/O 32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[15:12]
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
212
Rev 1.3