User's Manual

Specifications
ZigBit™ 2.4 GHz Wireless Modules 3-12
8226C–MCU Wireless–09/10
Table 3-6. Pin descriptions
Connector
Pin Pin Name Description I/O
Default
State after
Power on
1 SPI_CLK Reserved for stack operation
(4)
O
2 SPI_MISO Reserved for stack operation
(4)
I/O
3 SPI_MOSI Reserved for stack operation
(4)
I/O
4 GPIO0 General Purpose digital Input/Output 0
(2)(3)(4)(7)
I/O tri-state
5 GPIO1 General Purpose digital Input/Output 1
(2)(3)(4)(7)
I/O tri-state
6 GPIO2 General Purpose digital Input/Output 2
(2)(3)(4)(7)
I/O tri-state
7 OSC32K_OUT 32.768 kHz clock output
(4)(5)
O
8 RESET Reset input (active low)
(4)
9,22,23 DGND Digital Ground
10 CPU_CLK
RF clock output. When module is in active state, 4
MHz signal is present on this line. While module is
in the sleeping state, clock generation is also
stopped
(4)
.
O
11 I2C_CLK I
2
C Serial clock output
(2)(3)(4)(7)
O tri-state
12 I2C_DATA I
2
C Serial data input/output
(2)(3)(4)(7)
I/O tri-state
13 UART_TXD UART receive input
(1)(2)(3)(4)(7)
I tri-state
14 UART_RXD UART transmit output
(1)(2)(3)(4)(7)
O tri-state
15 UART_RTS
RTS input (Request to send) for UART hardware
flow control. Active low
(2)(3)(4)(7)
I tri-state
16 UART_CTS
CTS output (Clear to send) for UART hardware
flow control. Active low
(2)(3)(4)(7)(8)
O tri-state
17 GPIO6 General Purpose digital Input/Output 6
(2)(3)(4)(7)
I/O tri-state
18 GPIO7 General Purpose digital Input/Output 7
(2)(3)(4)(7)
I/O tri-state
19 GPIO3 General Purpose digital Input/Output 3
(2)(3)(4)(7)
I/O tri-state
20 GPIO4 General Purpose digital Input/Output 4
(2)(3)(4)(7)
I/O tri-state
21 GPIO5 General Purpose digital Input/Output 5
(2)(3)(4)(7)
I/O tri-state
24,25 D_VCC Digital Supply Voltage (V
CC
)
(9)
26 JTAG_TMS JTAG Test Mode Select
(2)(3)(4)(6)
I
27 JTAG_TDI JTAG Test Data Input
(2)(3)(4)(6)
I
28 JTAG_TDO JTAG Test Data Output
(2)(3)(4)(6)
O
29 JTAG_TCK JTAG Test Clock
(2)(3)(4)(6)
I
30 ADC_INPUT_3 ADC Input Channel 3
(2)(3)(7)
I tri-state
31 ADC_INPUT_2 ADC Input Channel 2
(2)(3)(7)
I tri-state
32 ADC_INPUT_1 ADC Input Channel 1
(2)(3)(7)
I tri-state
33 BAT
ADC Input Channel 0, used for battery level
measurement. This pin equals V
CC
/3.
(2)(3)(7)
I tri-state
34 A_VREF Input/Output reference voltage for ADC I/O tri-state