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Pinout Comparisons
c18
g18
Pin #
Pin #
11
12
GND
12
11
GND
13
14
UART1_DCD
14
13
UART1_RI
15
16
USB_D+_28
16
15
USB_D-_28
17
18
AUDIO_OUT _ONOFF
18
17
AGND
19
20
UART2_RTS
20
19
AUDIO_IN
21
22
GPS_ANT_PWR_28
22
21
UART1_DSR
23
24
UART2_CTS_UIM_CLK
24
23
USB_VBUS_28
25
26
UART1_RXD
26
25
UART1_TXD
27
28
UART1_RTS
28
27
UART1_CTS
* UART names are referenced to PC, as the c18 is a DCE device.
Odd/even pin number assignments are flipped between the c18 and the g18, but the physical locations of the
functions are identical on the connector. See "c18, g18 AND g20 PINOUT LOCATIONS" on page 62 for more
details.
Note
56
Table 20. c18/g18 28-pin Connector Comparison (Continued)
c18 Signal Name*
g18 Signal Name
GND
GND
RS232 – DCD
RS232 – RI
RXD UART2
TXD UART2
Analog audio out and power on/
off
Analog Audio GND
DSC – Enable
Audio in
DSC – Downlink
RS232 – DSR
SIM CR CLOCK
DSC – Uplink
RS232 – RXD
RS232 – TXD
RS232 – RTS
RS232 – CTS
c18 Signal Description
Power ground.
Power ground.
USB D+ signal. Serial 0Ω
resistor for disconnection.
USB D- signal. Serial 0Ω
resistor for disconnection.
Analog Audio_Out and on/off
(600Ω load impedance).
Analog audio GND.
From OEM to PC.
Analog Audio_In (Input
impedance > 10 kΩ).
External power for the active
GPS antenna serial 0
Ω
resistor for disconnection.
UART2 CTS or UIM_CLK.
5V nominal. Serial 0Ω resistor
to disconnect USB_VBUS.
From OEM to PC.
5V tolerant (from PC to OEM).
5V tolerant.
98-08901C63-A
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