Panasonic EB-X700, Service Manual

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4.6.6. Bluetooth Module
The bluetooth module U201 provides short range (typical 10 meters or less) connectivity from the hanset to bluetooth-enabled
devices such as headsets, car kits, and personal computers for transfer of voice and data.
The Application processor controls the initialization of the bluetooth module through the UART2 interface (BT-RX, BT-TX, Bt-
RTS and BT-CTS) and a reset line (GPIO13) BT-RST controls bluetooth reset.
Bluetooth system clock is supplied by a buffered 26MHz source built in to the RF chip SMARTI DC+, which has an on/off
function controlled by the BT-CLK-REQ signal line.
A PCM audio connection from U201 connects via the 4-wire I2S1 port of Modem processor S-GOLD, which uses 13-bit linear
PCM.
The SD interface of the Application processor supports Mini SD card operation at either 1-bit bus mode or 4-bit bus mode.
The Mini SD card used for X700 handset provides a convenient compact storage device for saving the data files, such
as pictures taken from the camera or the video clips loaded from PC and play back to the main LCD of the handset.
Mini SD card interface supports SD card hot insertion and removal, which is implemented by a mechanical switch built-in to
the Mini SD connector.
4.6.7. IrDA
The IrDA transceiver interface is provided by the UART3 port of the Application processor to support the slow IrDA with data
rate from 2.4kbps to 115.2kbps (IrDA-1.0 standard). The IrDA transceiver module can be set to low power mode using GPIO8
IrDA-SD-MODE control line.
4.6.8. SD Card
PROVISIONAL ISSUE