RF42/43
12. Pin Descriptions: RF42/43
Pin
Pin Name
I/O
Description
VDD_RF
VDD
+1.8 to +3.6 V supply voltage input to all analog +1.7 V regulators. The recommended VDD
supply voltage is +3.3 V.
1
TX
O
Transmit output pin. The PA output is an open-drain connection so the L-C match must
supply VDD (+3.3 VDC nominal) to this pin.
2
NC
—
—
I
No Connect.
3
4
5
6
7
8
9
NC
No Connect.
VR_PA
NC
Voltage Reference Power Amplifier.
—
I/O
I/O
I/O
No Connect.
GPIO_0
GPIO_1
GPIO_2
General Purpose Digital I/O that may be configured through the registers to perform various
functions including: Microcontroller Clock Output, FIFO status, POR, Wake-Up timer, Low
Battery Detect, TRSW, AntDiversity control, etc. See the SPI GPIO Configuration Registers,
Address 0Bh, 0Ch, and 0Dh for more information.
VDR
O
Regulated Output Voltage of the Digital 1.7 V Regulator. A 1 μF decoupling capacito is
required.
10
NC
—
No Connect.
11
12
VDD_DIG
VDD
+1.8 to +3.6 V supply voltage input to the Digital +1.7 V Regulator. The recommended VDD
supply voltage is +3.3 V.
SDO
SDI
O
I
0–VDD V digital output that provides a serial readback function of the internal control
registers.
13
20
21
22
23
Serial Data input. 0–VDD V digital input. This pin provides the serial data stream for the 4-line
serial data bus.
SCLK
nSEL
nIRQ
I
Serial Clock input. 0–VDD V digital input. This pin provides the serial data clock function for
the 4-line serial data bus. Data is clocked into the RF42/43 on positive edge transitions.
Serial Interface Select input. 0– VDD V digital input. This pin provides the Select/Enable
function for the 4-line serial data bus. The signal is also used to signify burst read/write mode.
General Microcontroller Interrupt Status output. When the RF42/43 exhibits anyone of the
Interrupt Events the nIRQ pin will be set low=0. Please see the Control Logic registers
section for more information on the Interrupt Events. The Microcontroller can then determine
the state of the interrupt by reading a corresponding SPI Interrupt Status Registers, Address
03h and 04h.
I
O
XOUT
O
Crystal Oscillator Output. Connect to an external 30 MHz crystal or leave floating if driving the
24
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