User's Manual

Interface Locations and Pinouts
1322x Sensor Node Reference Manual, Rev. 1.1
Freescale Semiconductor 4-5
4.7 Audio Subsystem Connections
The audio subsystem uses the following connections:
• 2.5mm stereo jack J3 - for headset mic and earphone
• Jumper J7 - selects audio output source. See Figure 4-3 for connections
Figure 4-3. J7 Audio Output Source Jumper
4.8 GPIO Connector
The GPIO connector (J2) is a standard 2.54mm/0.1inch spacing, 26-pin header. The connector provides
access to MCU GPIO, an external clock source connection, a timer output, ADC inputs, the SSI port, a
UART port, the SPI port, the I
2
C port, and the serial DAC output. Power is also provided on the connector.
• VCC is the main supply voltage. Current draw should be limited to 50 mA.
• CLKIN can be used to supply an external reference clock (nominally 24 MHz). The onboard
crystal must be removed and an ac-coupling capacitor added.
• Some of the GPIO are shared with onboard devices. Check for any conflict.
• The serial DAC output is available at the connector. The DAC output should not be selected as the
output audio source (J7) when used off board.
Table 4-4. GPIO Connector J2 Pinouts
Pin Name Function Notes
1 TMR1 Timer I/O or GPIO Hardwired to accelerometer G-SEL1.
2 CLKIN Source for external clock to
reference oscillator
• 13-26 MHz reference clock with <40 ppm accuracy
• Onboard crystal must be removed
• Enable signal to MC1322x by adding C58, 10pF; see
schematic
3 VCC Voltage supply from module 3V output from on-board regulation
4 GND System ground
5 ADC1 ADC Analog Input Channel or GPIO
6 ADC2 ADC Analog Input Channel or GPIO Hardwired to accelerometer XOUT. Disable accelerometer.
7 ADC3 ADC Analog Input Channel or GPIO Hardwired to accelerometer YOUT. Disable accelerometer.
8 ADC4 ADC Analog Input Channel or GPIO Hardwired to accelerometer ZOUT. Disable accelerometer
Audio Select
1-2 DAC
3-2 PWM
1
1
2
2
3
3
J7
TSM-103-01-L-SV
AUD FILTER INPUT
SERIAL DAC
PWM