CXA2534Q
3. Battery Charger
The Battery Charger is separated from the rest of the circuit. The ChgVCC pin (pin 36) is the power supply
pin to the charger circuit. The charging current is drawn in from the SEL pin (pin 37) and can be set by an
external resistor at ISET pin (pin 35). The charger has a built-in thermal shut down circuit. The shut down
temperature is set to 170 °C and 140 °C is the recovery temperature.
4. Wired Remote Interface
When the IC is at standby, it can be activated by pulling the START pin (pin 30) or the KEY IN pin (pin 31)
LOW. The START pin is controlled by the PLAY button on the main set and the KEY IN pin is controlled by
the PLAY button on the wired remote control panel.
The wired remote interface circuit is powered at REMO BATT pin (pin 32) which is connected to the BATT.
To ensure that the voltage at REMO BATT pin is not greater than VCC1, a resistor and zener diode (Vz=3.1
V) may be necessary.
The DC IN pin (pin 33) will detect a pulse through a series capacitor when a AC adapter is power on. This
pulse will activate the IC also.
—22—
SONY [ SONY CORPORATION ]
