Baseband Startup For Testing - Nokia NSB-7 Series Service Manual

NSB-7
System Module
CCONT at 3.6V and stores this reading to EEPROM memory as a reference point. Another
reference point is created by assuming that when the input voltage is zero, A/D reading
is also zero. Now the slope is known and A/D readings can be calibrated. Calibration is
included in VBATT A/D reading task.
Battery charging voltage VCHAR and current ICHAR are calibrated using one test setting.
Test jig in production line must have a connection to battery terminals. ICHAR is
adjusted to 500mA and VCHAR to 8.4V with appropriate load connected to the battery
terminals.
BTEMP is calibrated with 47kohm resistor.
BSI is calibrated with 22kohm resistor.

Baseband Startup for Testing

When an unprogrammed module is powered up the first time the MCU starts from the
boot rom inside the MAD2. The MBUS line is to be kept low to inform the MCU that the
flash prommer is connected and the MCU should stop after the boot and wait for a
download code.
When the flash programming is performed successfully the MCU switches to flash prom
software. If the baseband is powered up for the first time the MCU will remain in local
mode as the factory set has not been executed. To allow re-programming of working
modules the MCU is at startup forced into local mode by connecting the BSI and BTEMP
signals to ground using specified resistors.
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PAMS Technical Documentation
Issue 1 06/00