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| ATZB-900-B0 Datasheet, PDF (16/20 Pages) ATMEL Corporation – ZigBit™ 700/800/900 MHz Wireless Modules | |||
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Figure 3-3. Typical Reference Schematic
RST
Host MCU
UART_TXD
UART_RXD
UART_RTS
UART_CTS
VCC
1,8..3,6V 1uF
1 SPI_CLK
2 SPI_MISO
3 SPI_MOSI
4 GPIO0
5 GPIO1
6 GPIO2
7 OSC32K_OUT
8 RESET
9 DGND
10 CPU_CLK
11 I2C_CLK
12 I2C_DATA
13 UART_TXD
14 UART_RXD
15 UART_RTS
16 UART_CTS
17 GPIO6
18 GPIO7
19 GPIO3
20 GPIO4
21 GPIO5
22 DGND
23 DGND
24 D_VCC
25 D_VCC
Specifications
JTAG_TMS 26
JTAG_TDI 27
JTAG_TDO 28
JTAG_TCK 29
ADC_INPUT_3 30
ADC_INPUT_2 31
ADC_INPUT_1 32
BAT 33
A_VREF 34
AGND 35
GPIO9 36
UART_DTR 37
USART0_RXD 38
USART0_TXD 39
USART0_EXTCLK 40
GPIO8 41
IRQ_7 42
IRQ_6 43
RF_GND 44
RFP_IO 45
RF_GND 46
RFN_IO 47
RF_GND 48
VCC
100k
5 JTAG_TMS
9 JTAG_TDI
3 JTAG_TDO
1 JTAG_TCK
4 JTAG_VCC
7 NC
8 NC
6 JTAG_RST
2 JTAG_GND
10 JTAG_GND
Balun
0900BL18B100
6
3
two capacitors* 5
2
4
1
*) 68 pF
GRM 1555C1H101JZ01D
3.4 Mounting Information
The below diagrams show the PCB layout recommended for ZigBit 900 module. Neither via-holes nor
wires are allowed on the PCB upper layer in area occupied by the module. As a critical requirement,
RF_GND pins should be grounded via several holes to be located right next to the pins thus minimizing
inductance and preventing both mismatch and losses.
ZigBit⢠700/800/900 MHz Wireless Modules
3-9
8227CâMCU Wirelessâ06/09
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