Keyboard; Bluetooth (Only S55) - Siemens S55 Repair Documentation

10 Keyboard

The keyboard is connected via the lines KB0 – KB9 with the EGOLD+.
KB 7 is used for the ON/OFF switch. The lines KB0 – KB5 are used as output signals.
In the matrix KB6, KB8 and KB9 are used as input signals for the EGOLD+.

11 Bluetooth (only S55)

The Bluetooth Interface is compatible to the Bluetooth specification version 1.1 power
class 2 (-6 dBm up to +4dBm) with a RX sensitivity better than –70 dBm. It supports a
transmission rate up to 723 kBit/s data asymmetrically over the air interface.
The transmission range is approx. 10 m.
It is not possible to use the Bluetooth interface and the IRDA interface at the same
time.
The Bluetooth antenna is via a pin diode switch connected with the D450 (TX=J7, J8
and RX=J5, J6). With the signals RXON (D450, E9) and TXON (D450, D9) the
antenna is switched to RX or TX.
RXON
TXON
RX TX
TX
RX
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