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Connector Pin Assignments
28-pin
Header
Signal Name
Pin #
14
UART1_RI
15
USB_D+_28
16
USB_D-_28
17
AUDIO_OUT _ONOFF
18
AGND
19
UART2_RTS
20
AUDIO_IN
21
GPS_ANT_PWR_28
22
UART1_DSR
23
UART2_CTS_UIM_CLK
24
USB_VBUS_28
25
UART1_RXD
26
UART1_TXD
27
UART1_RTS
28
UART1_CTS
* Signals (functions) unique to the c18 (not supported by the g18).
All identical names for 70/36/28-pin connectors correspond to the same signal.
All UART names are referenced to PC, as the c18 is a DCE device.
Note
Odd/even pin number assignments are flipped between the c18 and the g18, but the physical locations of the func-
tions are identical on the connector. For more details, see "Pinout Comparisons" on page 55.
46
Table 18. 28-pin DIN Connector Pinout (Continued)
g18
Signal
Pin #
Level [V]
13
N/A*
N/A*
18
1.06 Vp-p
17
N/A*
19
1.28 Vp-p
N/A*
3.0 or 5.0
21
24
N/A*
4.4 – 5.25
26
25
28
27
I/O
2.8
O
3.3
I/O
USB D+ signal.
3.3
I/O
USB D- signal.
I/O
Analog Audio_Out and on/off.
–
–
Analog audio GND.
2.8
I
From OEM to PC.
Analog Audio_In. Input impedance:
I
> 10kΩ.
External power for the active GPS
I
antenna. Serial 0Ω resistor for
disconnection.
2.8
O
2.8
O
UART2 CTS or UIM_CLK.
5V nominal. Serial 0Ω resistor to
I
disconnect USB_VBUS.
2.8
O
From OEM to PC.
2.8
I
5V tolerant (from PC to OEM).
2.8
I
5V tolerant.
2.8
O
Description
98-08901C63-A
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