Motorola D10 Service Manual page 61

BenQ
receive, BFSX and BDX for transmit. BDX is the transmitted serial
data output. BFSX is the transmit frame synchronization and is used
to initiate the transfer of the transmit data. BDR is the received serial
input. BFSR is the receive frame synchronization and is used to
initiate the reception data.
3.2.10 Battery charger Interface (BCI)
The main function of the Nausica charger interface is the charging
control of either a 1-cell Li-ion Battery or 3-serie Ni-MH cell batteries
with the support of the micro-controller (Ulysse).
monitoring uses the 10 bit ADC converter from the MADC to
measure the battery voltage, battery temperature, battery type,
battery charge current, battery charger input voltage.
magnitude of the charging current is set by the 10 bits of a
programming register converted by an 10 bit Digital to Analog
Converter, whose output sets the reference input of the charging
current control loop. The battery charger interface performs also
some auxiliary functions. They are battery pre-charge, battery trickle
charge and back-up battery charge if it is rechargeable.
3.2.11 Monitoring ADC (MADC)
The MADC consists in a 10-bit analog to digital converter combined
with a nine inputs analog multiplexer. Out of the nine inputs five are
available externally, the four remaining being dedicated to main
battery voltage, back up battery voltage, charger voltage and
charger current monitoring. On the five available externally three are
standard inputs intended for battery temperature, battery type
measurements.
3.2.12 Reference Voltage / Power on Control (VRPC)
An integrated band-gap generates a reference voltage. This
reference is available on an external pin for external filtering purpose
only. This filtered reference is internally used for analog functions.
The external resistor connected between pin IBIAS and GNDREF sets,
from the band-gap voltage, the value of the bias currents of the analog
functions. The VRPC block is in charge to control the Power ON,
Power OFF, Switch On, and Switch OFF sequences. Even in Switch
OFF state some blocks functions are performed. These "permanent"
functions are functions, which insure the wake-up of the mobile such as
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Rev 1.0
The battery
The