Benefon EXION TDP80DN, Service Manual

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9.2.2001
4Z2700GB.fm 10
Product: TDP80DN / OC2720 Processor/Audio/RF
from voltage divider R143, R144 and depending also from the battery voltage
(VB).
The PWRSW line is coupled to DSP on/off logic. The DSP drives REGUEN
signal high and it drives the main regulator (I111) to operate.
The power off operation is done with the same way. The power switch is
pressed a little longer and the shutdown procedure begins. The REGUEN
signal goes low and powers off the phone.
5.2.3.5 Sis
SIM is performed by a BENEFON ASIC IG2048 manufactured by ATMEL.
Integrated circuit IG2048 is E2 logic array. This type of array incorporates both
electrically and programmable read only memory (EEPROM) and a gate array
for SIM funcrtion.
User specific information is stored in EEPROM which CANNOT be read from
outside the chip. Allexternal attempts to read the information clear both
EEPROM and RAM (fill with FF).
5.2.3.6 Charging control
The charging function is controlled by the software. The charger is detected by
PWRCHG line (High = charger detected, low = charger not detected). The type
of charger (fast or slow) is detected by the voltage at V_CHG_ADC line.
The charger switches also the power on.
There is a NTC resistor in the battery pack to measure the temperature. This is
done with SBAT_ID0 line and the voltage is read by an AD converter in DSP.
The type of battery pack in detected in a same way with SBAT_ID1 line with
another channel of ADC.
ID resistors in battery pack:
N/A 0 ohm reserved for future use
900 mAh 47 kohm 900 – 1000 mAh
1150 mAh 100 kohm 1050 – 1300 mAh
1400 mAh 150 kohm 1350 - 1550 mAh
1600 mAh 220 kohm > 1600 mAh
adapter 10 kohm adapter
battery fail open not detected