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Enfora Enabler III-G
Modem Integration Guide
6.6.4.
Level Translation Reference Power (Pin 77)
To be used as a voltage reference source ONLY. Do not connect current loads to this pin. This pin
must be decoupled to ground with at least a 0.1 μF capacitor at the output. Noise induced on this pin
will affect the performance of the baseband.
V
I/O
R
Output voltage V
OUT
Rated output current I
OUT
6.6.5.
USB (Pins 1, 3, 5, 7, 9)
Pin Name
USB_VBUS
USB_DP/RXD/MIC_R
USB_DP
ID_USB
The universal serial bus (USB) device controller supports the implementation of a full-speed (FS) device
compatible with the Universal Serial Bus Specification Revision 2.0 and the Universal Serial Bus
Specification Revision 1.1.
The module includes a Universal Serial Bus (USB) transceiver with a car-kit detection, able to support
USB 12 Mb/s Full-Speed (FS) and USB 1.5 Mb/s Low-Speed (LS). When a USB cable is plugged into
the USB receptacle, the transceiver detects the cable's presence on VBUS (> 1.8 V) and ID (≠ float) pins,
even if the module is switched off. The transceiver is fully operational only in phone's Active mode.
The modules device's car kit is developed based on CEA-936-A rev.39 – Nov. 24th 2004 specification.
Currently the device does not support other versions of this specification. Compared to the CEA-936-A
rev.39 – Nov. 24th 2004 specification, the car-kit implementation in the module device does not support
[1] a fully implemented hardware Phone State Machine, [2] the relative interrupts and registers for the
proper behavior of the Phone State machine and [3] the Data-During- Audio signaling mode.
GSM0308PB001
Parameter/Conditions
ON mode
LOW POWER mode
ON mode
LOW POWER mode
Pin
Signal
Number
Direction
1, 3
In
5
Analog
I/O
7
Analog
I/O
9
Analog
I/O
37
Min
Typ
1.65
1.8
1.65
1.8
Description
5 V tolerant power Supply VBUS line;
Used only as a USB sense, not for powering the
module. (optional connection)
5 V tolerant data plus pin in USB modes /
Receive function in UART mode /
Microphone or right speaker in AUDIO mode
5 V tolerant data minus pin in USB modes /
Transmit function in UART mode /
Monaural speaker or left speaker in AUDIO
mode
5 V tolerant ID line, it defines the type of
device connected to the phone's USB port;
And also the default state (host / device) at
the cable connection;
The transceiver senses the voltage of this
pin to determine if the pin is either floating
(typical),grounded or resistively connected
to ground (102 kΩ, 200 kΩ, 440 kΩ);
Version DRAFT – 2/9/2007
Max
Units
1.95
Vdc
1.95
20
mA
0.5
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