EM351 / EM357
Table 1-1. EM35x Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
Signal
VDD_24MHZ
VDD_VCO
RF_P
RF_N
VDD_RF
RF_TX_ALT_P
RF_TX_ALT_N
VDD_IF
NC
VDD_PADSA
PC5
TX_ACTIVE
Power
I/O
O
Direction
Power
Power
I/O
I/O
Power
O
O
Power
Description
1.8 V high-frequency oscillator supply
1.8 V VCO supply
Differential (with RF_N) receiver input/transmitter output
Differential (with RF_P) receiver input/transmitter output
1.8 V RF supply (LNA and PA)
Differential (with RF_TX_ALT_N) transmitter output (optional)
Differential (with RF_TX_ALT_P) transmitter output (optional)
1.8 V IF supply (mixers and filters)
Do not connect
Analog pad supply (1.8 V)
Digital I/O
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]
Active low chip reset (internal pull-up)
Digital I/O
32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[11:8]
Inverted TX_ACTIVE signal (see PC5)
Select alternate output function with GPIO_PCCFGH[11:8]
Digital I/O
32.768 kHz crystal oscillator
Select analog function with GPIO_PCCFGH[15:12]
Digital 32.768 kHz clock input source
Regulator output (1.8 V while awake, 0 V during deep sleep)
Pads supply (2.1-3.6 V)
1.25 V digital core supply decoupling
Digital I/O
Disable REG_EN with GPIO_DBGCFG[4]
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]
Timer 1 Channel 4 input
Cannot be remapped
External regulator open drain output
Enabled after reset
Digital I/O
12
13
nRESET
PC6
OSC32B
nTX_ACTIVE
I
I/O
I/O
O
I/O
I/O
I
Power
Power
Power
I/O
High
current
O
14
PC7
OSC32A
OSC32_EXT
15
16
17
18
VREG_OUT
VDD_PADS
VDD_CORE
PA7
TIM1C4
TIM1C4
REG_EN
19
PB3
I
O
I/O
1-2
Preliminary
120-035X-000D
ETC [ ETC ]
