Chaps Battery

Nokia 6185

2-wire charging

With 2-wire charging the charger provides constant output current, and the charging is controlled by PWMOUT signal from CCONT to CHAPS. PWMOUT signal frequency is selected to be 1 Hz, and the charging switch in CHAPS is pulsed on and off at this frequency. The final charging current to the battery is controlled by adjusting the PWMOUT signal pulse width.

Both the PWMOUT frequency selection and pulse width control are made by the MCU which writes these values to CCONT.

The 2-wire charger is part number ACP-7, has full-wave rectified output, defined output voltage and impedance. Typical output current into empty battery is about 350 mA at nominal mains voltage.

3-wire charging

With 3-wire charging the charger provides adjustable output current, and the charging is controlled by PWMOUT signal from CCONT to Charger, with the bottom connector signal. PWMOUT signal frequency is selected to be 32 Hz, and the charger output voltage is controlled by adjusting the PWMOUT signal pulse width. The charger switch in CHAPS is constantly on in this case.

The 3-wire charger is part number ACP-9, a switchmode power supply (SMPS) adapter using 3-wire charging structure (controlled constant voltage). Typical output into an empty battery is about 850mA at nominal mains voltage.

Battery disconnected when charger is connected

From hardware point of view the phone could otherwise continue functioning normally, but if the charger voltage is higher than the maximum allowed battery voltage, this can damage the RF parts. Therefore, output overvoltage protection is needed in case the battery is removed when a charger is connected, or if a charger is connected before the battery to the phone. With a charger connected, if VBAT exceeds preset limits in CHAPS, the switch turns OFF immediately (soft switching bypassed). There are two voltage limits, VLIM1 and VLIM2. VLIM input = '0' selects VLIM1, VLIM input = '1' selects VLIM2.

Parameter

Symbol

Min

Typ

Max

Unit

Output voltage cutoff limit (during transmission or Li-battery)

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