ADuCRF101 Data Sheet
Pin
No. Mnemonic Description
17 VDDVCO
Voltage Regulator Output for Voltage Controlled Oscillator (VCO). For regulator stability
and noise rejection, place a 220 nF capacitor between this pin and ground.
18 LVDD2
On-Chip LDO Decoupling Output. Connect a 0.47 µF capacitor to the 1.32 V output to
ensure that the core operating voltage is stable. For correct operation, connect a 1 µF
capacitor between this pin and LVDD1( Pin 16).
19 SWDIO Serial Wire Bidirectional Data.
20 GND Ground. Connect this pin to the exposed pad.
21 IOVDD General-Purpose I/O Supply
1
. Connect this pin to the battery terminal.
23 VCOGUARD Guard, Screen for VCO. Connect this pin to VDDVCO.
24 VDDSYNTH
Voltage Regulator Output for Synthesizer. For regulator stability and noise rejection,
place a 220 nF capacitor between this pin and ground.
25 CWAKE
External Capacitor for Wake-Up Control. Place a 150 nF capacitor between this pin and
ground.
Connect the 26 MHz reference crystal between this pin and XOSC26N (HFXTAL).
3
27 XOSC26N Connect the 26 MHz reference crystal between this pin and XOSC26P (HFXTAL).
28 DGUARD Internal Guard, Screen for Digital Cells. Connect this pin to VDD_DIG1.
29 VDD_DIG1
Voltage Regulator Output for the Digital Section of the Transceiver. For regulator stability
and noise rejection, place a 220 nF capacitor between this pin and ground.
General-Purpose Input and Output Port 1.5 (P1.5).
External Interrupt 6 (IRQ6).
I
2
C Serial Data (I2CSDA).
PWM Channel 7 (PWM7).
31 P1.4/IRQ5/I2CSCL/PWM6 General-Purpose Input and Output Port 1.4 (P1.4).
External Interrupt 5 (IRQ5).
I
2
C Serial Clock (I2CSCL).
PWM Channel 6 (PWM6).
32 P1.3/PWM5 General-Purpose Input and Output Port 1.3 (P1.3).
PWM Channel 5 (PWM5).
33 P1.2/PWM4 General-Purpose Input and Output Port 1.2 (P1.2).
PWM Channel 4 (PWM4).
34
P1.1/
POR/TXD/PWM3
General-Purpose Input and Output Port 1.1 (P1.1).
Power-On Reset Output (
POR).
UART TXD (TXD).
PWM Channel 3 (PWM3).
35 P1.0/RXD/IRQ4/MOSI/PWM2 General-Purpose Input and Output Port 1.0 (P1.0).
External Interrupt 4 (IRQ4).
SPI1 Master Out, Slave In (MOSI).
PWM Channel 2 (PWM2).
36
P0.5/
CS2/ECLKIN
General-Purpose Input and Output Port 0.5 (P0.5).
SPI1 Chip Select 2 (
CS2).
External Clock Input (ECLKIN).
37
P0.4/
CS1/ECLKOUT
General-Purpose Input and Output Port 0.4 (P0.4).
SPI1 Chip Select 1 (
CS1).
External Clock Output (ECLKOUT).
38 P2.6
General-Purpose Input and Output Port 2.6. Do not connect this pin. This pin is
connected internally to the RF transceiver. It can be used for BER measurements.
39
P0.3/IRQ1/
CS0/ADCCONVST/PWM1
General-Purpose Input and Output Port 0.3 (P0.3).
External Interrupt 1 (IRQ1).
SPI1 Chip Select 0 (
CS0).
ADC Convert Start (ADCCONVST).
PWM Channel 1 (PWM1).
Rev. A | Page 14 of 19