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Functions
Pin
Requirements
WATCHDOG_UP
Watchdog
monitoring
WATCHDOG_UP
Regular "switch
off" of the
mobile phone
Low Voltage
LOWVDD
Detector
RESET
Reset Signal
Switch off of the
VDD
phone in the
case of
overvoltage at
the battery
VREG2
Voltage Supply
U2V0
for the Logic
V1.0
A35-A36-A40
Implementation / Explanation
The first Watchdog Impulse of the EGOLD+
• must be operated at the latest 800ms after the
rising edge of the "Reset" signal and
• the WD-Signal must have a rising edge.
If one of these conditions is not fulfilled, the mobile phone will
switch off.
If this conditions are fulfilled, rising and falling edges are
evaluated alternately and used to reset the WD-Timer. With
each edge at the WATCHDOG_UP pin the WD-Timer will be
reseted. Conditions:
The next (inverted to the previous one) edge have to occur
within a time of 0.4s...2.6s. If the next edge is recognised
before expiry of 0.4s or after an expiry of 2.6s or if the next
recognised edge is not inverted, the mobile phone will switch
off.
Switching off of the phone is possible, as described in the
watchdog monitoring control, if the EGOLD+ is not longer
serving the WATCHDOG_UP pin.
"Switching off" means:
RESET
to LOW
POWER_ON
to LOW
CHARGE
to HIGH-Z.
Regulator 1V9, 2V65 and 2V9 are "OFF"
The ASIC goes into the POWER-DOWN mode.
Not used
Power-Up:
During the entire "switch on" procedure the RESET signal is
on "LOW-Level". If the "switch on" conditions are fulfilled the
change to "HIGH-Level" is taken place after 180ms.
Power Fail:
In the "unit on" mode the voltage levels of the 1.9V and 2.9V
voltage supply shall be monitored. If one of this voltages drops
below a certain level for longer than 10µs, the RESET signal
switches to "LOW-Level".
In the case of a too high voltage at the VDD,(voltage level
5.8V ± 0.2V within 1µs), the mobile phone will switch off.
The linear controller is designed for 1.92V(±3%) and a
maximum current of 100 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 >3.1V , the output
transistor will switch off.
Page 20 of 38
Company Confidential
ICM MP CC ST
09/01
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