Siemens S55 - Bluetooth Voltage Regulator

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
The following interface between E-GOLD+ and the BlueMoon Single Bluetooth IC
(IFX) is used:
Name IN/OUT Remarks
Power supply
VCC_BT IN Generated with external voltage regulator
(LP3985) N450
VIN = BATT+
BT_ON IN Enable the voltage regulator
Clocks
CLK32K IN 32,768 kHz, (supplied by the EGOLD+)
BT_SIN26M IN Supplied by the GSM VCXO
UART
IR_BT_TX IN TX (serial interface multiplexed with IRDA)
IR_BT_RX OUT RX (serial interface multiplexed with IRDA)
PCM
PCMIN IN Transmission of voice samples
DAI-interface from EGOLD+
PCMOUT OUT
PCMCLK OUT The 500 kHz clock is generated from
BlueMoon Single
PCMFR IN The frame signal is generated from
EGOLD+
Miscellaneous
BT_WAKEUP_GSM OUT Connected to an interrupt input of
EGOLD+, wake up EGOLD+ during Low
power mode
BT_WAKEUP_BT IN Wake up the BlueMoon Single during Low
power Mode
BT_VCXOEN Connected to the ASIC, switched ON the
RF-Regulator for the GSM-VCXO
11.1 Bluetooth Voltage Regulator
The Voltage Regulator N450 generates 2.7 Volt for the Bluetooth Chipset. The
EGOLD+ activates the voltage with the signal BT_ON (
GSM TDMA-Timer F17).