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3.2.1
Current Consumption
In order to correctly design the power supply or battery for the c18, integrators should take into account the current consumption
of the c18 in its various operating modes. The c18 is a CDMA phone that transmits in continuous mode. Table 6 lists the
maximum current for each mode supported by the c18 module.
3.3
c18 OPERATING MODES
The
c18 has four input pins, OPT1, OPT2, AUDIO IN and USB_VBUS, which define the c18 mode of operation.
Table 7 summarizes the available operating modes on the c18.
Mode
RS232 (8 W) +
analog audio
USB + analog
audio
USB + RS232
Flashing
Note: 1: The default state. The c18 contains internal pull-up resistors. Configuration pins can be left open.
0: Requires external 10k
Other combinations of pin states are not supported and should not be used.
OPT1 and OPT2 signals are not available on models using a 28-pin interface connector. In this case, the
communication mode depends on the model. Some models are supplied with a hardware RS232 preset mode,
Note
models without such a preset may be used for USB communication only.
For more information about pin locations, see "Connector Pin Assignments" on page 39.
98-08901C63-A
Table 6. Current Consumption
Mode
IS95 A/B
Talk
740 mA
Receive
110 mA
Standby
5 mA*
Off
* For SCI2, TBR = 30 minutes.
Table 7. c18 Modes of Operation
OPT1
OPT2
0
1
1
1
1
1
Shorted
Shorted
to OPT2
to OPT1
Ω
pull-down resistor.
Current Consumption
1X
740 mA
940 mA
110 mA
55 mA
< 3.7 mA*
55 mA
µ
< 5
A
Pin Name
AUDIO IN
USB_VBUS
1
1
> 4.0 V
0
> 4.0 V
1
Hardware Description
AMPS
Notes
* Pull-down resistor is
0*
not required
Required for CDG2
certification
Non-standard mode
used for special flashing
17
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