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5.1.7 Vibration Motor
The vibration motor is mounted in the lower case. The electrical connection to the
PCB is realised with pressure contacts.
6 Power Supply
6.1 Power Supply ASIC
The power supply
ASIC
will contain the following functions:
• Powerdown-Mode
• Sleep Mode
• Trickle Charge Mode
• Power on Reset
• Digital state machine to control switch on and supervise the µC with a watchdog
• Voltage regulator
• Low power voltage regulator
• Additional output ports
• Voltage supervision
• Temperature supervision with external and internal sensor
• Battery charge control
• I
C interface
2
• Audio multiplexer
• Audio amplifier stereo/mono
• 16 bit Sigma/Delta DAC with Clock recovery and I
S
2
• Bandgap reference*
INFO:
* Bandgap reference
The p-n junction of a semiconductor has a bandgap-voltage. This bandgap-voltage is
almost independent of changes in the supply voltage and has a very low temperature
gradient. The bandgap-voltage is used as reference for the voltage regulators.
V1.20
Page 26 of 48
ICM MP CCQ GRM
A55/C55_Hitachi
Company Confidential © Copyright Siemens AG
04/03
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