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AT73C202
Power ON Control Block
This block generates the Power ON and Power OFF for the AT73C202. Power ON is
activated when one of these conditions is true:
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The AC/DC Charger is plugged (CHG-IN input): the DC-ON pin is then set to high
level
ON/OFF Key is set to high level, which sets the ON-OFF pin to high level
UP-ON/OFF is set to high level
To achieve all Power ON, the conditions below must be true:
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Battery must be higher than normal operating voltage (V BATTERY > 3.2V)
Thermal protection is right (T J < 120°C)
When the ON/OFF Key is pressed (tied to V BAT ), the POWER-EN goes to high level and
activates the Base Band Chip Core Supply. As the Base Band Chip detects the
ON/OFF, it must drive UP-ON/OFF to high level in order to maintain the POWER-EN at
high level and the ON/OFF key can be released. When the ON/OFF key is pressed
again to power off, the base band chip releases the UP-ON/OFF pin to low level.
Note that UP-ON/OFF can also be generated as a wake-up alarm when the phone is in
OFF mode (the UP-ON/OFF pin is supplied by the back-up battery on V-RTC (1.0V to
1.8V).
Charger Controller Block There are three specific phases of battery charging:
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Pre-charge when V BAT < 3.2V with 50 mA pulsed current stopped by either software
or hardware if V BAT > 3.6V or the software crashes.
Fast charge with C O current by software
Pulse charging with C O current for end of charge by software.
Note: C O equals 600 mA when the battery capacity equals 600mAH.
Fast charging and pulse charging use only one switch. The pre-charging will be done
using a pulse charging C O during 100 ms each second.
Pre-charging Phase
Pulse & Fast charging
FLASH-LED Description
When the Base Band Chip is powered OFF and battery voltage is under 3.2V, the
charge must be performed by the AT73C202. To ensure no damage occurs, the current
is limited to 50 mA or nominal capacity divided by 10 (C O / 10).
When the base band chip is powered ON and sets CHG at high level the pre-charge
phase is finished.
In case of a software crash after power on, a watchdog timer of 10s will set the RES-B to
"0" and turn off the device.
In this phase, the base band chip controls the charge through the CHG pin and monitors
the battery voltage and temperature through BAT-VOLT on the AT73C202 and temper-
ature through any available temperature sensor in the battery pack.
When Battery voltage is under 4.1V, the charger is always active (CHG is high level). As
soon as battery voltage exceeds 4.1V, the software enters into a pulse charging phase.
The pulse charging stops when battery voltage reaches 4.2V.
During the pre-charging phase, the phone is OFF. To indicate the pre-charging is cur-
rently running, a LED driver (LED-OUT, open drain) is turned on every second for
100ms. During the fast charge and pulse charging, the Baseband can control the LED
driver through the FLASH-LED pin.
7
2740B–PMGMT–05/03
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RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
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RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V
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