V1.0 Page 21 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
Voltage Supply
for the Logic
VREG3
U2V65
Not used
Voltage Supply
for the Logic
VREG1
U2V9
The linear controller is designed for 2.92V(±3%) and a
maximum current of 140 mA.
It consists basically of an internal operation amplifier, an
integrated p-channel output transistor as well as an external
capacitor (C = 2.2µF) for stabilising the voltage. This regulated
voltage is measured internally.
In case of an internally measured voltage >3.3V , the output
transistor will switch off.
Voltage Supply
for
SIM-CARD
CCVZQ
CCVCC
The voltage supply for the SIM-CARD (CCVCC) is switched
by the signal CCVZQ from the EGOLD+ via a “LOW” at pin 12
The output signal CCVCC can be measured at pin 13 (2,8V)
The picture 5212 shows the CCVCC depending on the signal
5211 CCVCZQ from EGOLD+
Charge Support
CHARGE,
CHARGE_uP,
TBAT
For controlling the battery charge function, a charge support is
integrated in the ASIC. It consists basically of an internal
current source, a temperature sensor, an external charge FET
with a Pull-Up resistor between the source and the gate of the
charge FET.
The current source is switched on trough a rising edge of the
CHARGE_UP signal and generates an “LOW” at pin 3
(Charge). With this “LOW” the charge FET becomes
conducting.
Exceptions:
a) The temperature comparator does give a signal for high
temperature
b) An overvoltage is present at the VDD.
C) A falling edge at the CHARGE_UP.
Low Voltage
Regulator for RTC
VDD_RTC Voltage regulator to provide the Real Time Clock with the
required 2V. Current consumption is ~1mA
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