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ZMN2405 I/O Pad Descriptions
Pad
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 - 20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Name
VCC
GND
PWMA
PWMB
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GND
LINK/DD
/RESET
ACT/DC
NC
ADC REF
GND
UART_RX
UART_TX
NC
/RESET
ADCX
ADCY
ADCZ
GND
SPI_EN
SPI_SCLK
SPI_MOSI
SPI_MISO
GND
GND
RFIO
GND
Description
Power supply input, +3.3 to +5.5 Vdc.
Power supply and signal ground. Connect to the host circuit board ground.
Pulse-width modulated output A. Provides a DAC function when used with an external low-pass filter.
Pulse-width modulated output B. Provides a DAC function when used with an external low-pass filter.
Configurable digital I/O port 0. When configured as an output, the power-on state is also configurable.
Configurable digital I/O port 1. When configured as an output, the power-on state is also configurable.
Configurable digital I/O port 2. When configured as an output, the power-on state is also configurable.
Configurable digital I/O port 3. When configured as an output, this high current port can sink up to 20 mA. The
power-on output state is also configurable.
Configurable digital I/O port 4. When configured as an output, the power-on state is also configurable.
Configurable digital I/O port 5. When configured as an output, the power-on state is also configurable.
Power supply and signal ground. Connect to the host circuit board ground.
Output signal indicating module’s link status in default mode. Also used by JTAG interface as Data Output.
Active low hardware reset. Hold this input low when the power supply is below 2.7 V. In parallel with pad 24.
Output signal indicating RF data activity. Also used by JTAG interface as Data Clock Input.
No connection.
Module’s +3.3 V regulated supply, used for ratiometric ADC readings. Current drain on this output should be no
greater than 5 mA.
Power supply and signal grounds. Connect to the host circuit board ground.
Serial data input to UART.
Serial data output from UART.
No connection.
Active low hardware reset. Hold this input low when the power supply is below 2.7 V. In parallel with pad 13.
7- to 12-bit ADC input X. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
7- to 12-bit ADC input Y. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
7- to 12-bit ADC input Z. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
Power supply and signal ground. Connect to the host circuit board ground.
Active-low enable output for SPI bus devices.
SPI port clock signal.
SPI port data output.
SPI port data input.
Power supply and signal ground. Connect to the host circuit board ground.
RF ground. Connect to the host circuit board ground plane, and to shield when using coaxial cable.
RF port. Connect the antenna to this port with a 50 ? stripline or semi-rigid coaxial cable.
RF ground. Connect to the host circuit board ground plane, and to shield when using coaxial cable.
www.RFM.com E-mail: info@rfm.com
?2008 by RF Monolithics, Inc.
Page 4 of 6
ZMN2405 - 5/20/08
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