V1.0 Page 18 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
5.2 STV-ASIC
The power supply ASIC contains the following functions: Notes
• Control of “switching on” the mobile phone via
1.The ON/OFF Key. (ON_OFF)
2.The bottom connector with (External Power)
3.The Real Time Clock RTC (ON_OFF2)
• Watchdog monitoring
1.Control of “switching off” the mobile phone via WATCHDOG_µP.
2. Watchdog observation
• “Switching off” of mobile phone in the case of overvoltage at battery
connectors.
• Generation of RESET signal for EGOLD+, Flash and MMI components
• Generation of 2.90 V via linear controller for the logic IC.
• Generation of 2.65 V via linear controller for the logic IC.
• Generation of 2.00 V via linear controller for the logic IC.
• Battery charge support:
1.Normal charging
2.Trickle charging, if the battery voltage is below 3,2 V
• Timer generation:
All internal timers and pulses are derived from a 900 kHz ± 10% internal oscillator.
Responsible for the frequency stability is an external resistor (R213) (1%) at the
RREF pin
5.2.1 Switch “ON” sequence
- Generation of the “2,0; 2,65; 2,9” voltages
- Generation of the “RESET_2,0V and RESET_2,65V”
- Generation of the “POWER_ON” through N201
- Generation of the “Watch Dog” signal through the EGOLD+
after “POWER_ON”
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