Nokia RM-596 Service Manual page 213

RM-596
System Module
BOB is the name given to a generic technology release that combines WLAN, Bluetooth, FM Rx and FM TX radio
on a single monolithic IC. RM-596 uses BOB1.0M-b module that consists of a single chip transceiver WL1271,
plus a separate RF front end (FE) device. The BOB1.0M-b release operates in the 2.4GHz (ISM) and the
76-108MHz FM bands.
Figure 50 BOB1.0M-b module block diagram and application circuit
From a troubleshooting point of view, WLAN is tested separately, but BTH, FMRX and FMTX are checked in
parallel.
REFOUT_EXT1 single ended 38.4 MHz analog clock from Linko RF is provided to BOB1.0M-b. The clock request
for the reference clock in the BOB1.0M-b module is shared between WLAN and BTHFM blocks. When either
system requires a clock, this signal will be active. The CLK_REQ is connected to ExtSysClkReq pin of RAPU. The
SLEEPCLK input of 32.768 KHz clock from EM ASIC is used for power management and for FM in low power
mode.
The internal SMPS supplies the whole BOB1.0M-b solution from the phone battery supply, VBAT, apart from
VIO, which is needed for interface signal reference levels.
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