LG KE990 Service Manual - Page 39

Charging control

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3. TECHNICAL BRIEF 3.7.3 Charging control A programmable charging block in PM6635 is used for battery charging. It is possible to set limits for the charging current. The external supply typically connects directly to pin (VCHG). The voltage on this pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is applied or not. For additional accuracy or to capture variations over time, this voltage is routed internally to the housekeeping ADC via the analog multiplexer. PM6635 circuits monitor voltages at VCHARGER and ICHARGE pins to determine which supply should be used and when to switch between the two supplies. These pins are connected to the Source (or emitter) and Drain (or collector) contacts of the pass transistor respectively. PM6635 PM6635 4.2V~3.81V 100~70 (%) 3.80V~3.71V 69~45 (%) 3.70V~3.62V 44~20 (%) 3.61V~3.50V 19~3 (%) KE990 Battery Bar Display(Stand By Condition) 3.49V~3.28V 2~0 (%) LGE Internal Use Only - 40 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
- 40 -
3.7.3 Charging control
A programmable charging block in PM6635 is used for battery charging. It is possible to set limits for
the charging current. The external supply typically connects directly to pin (VCHG). The voltage on this
pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is applied or
not.
For additional accuracy or to capture variations over time, this voltage is routed internally to the
housekeeping ADC via the analog multiplexer. PM6635 circuits monitor voltages at VCHARGER and
ICHARGE pins to determine which supply should be used and when to switch between the two
supplies. These pins are connected to the Source (or emitter) and Drain (or collector) contacts of the
pass transistor respectively.
4.2V~3.81V
100~70 (%)
3.80V~3.71V
69~45 (%)
3.70V~3.62V
44~20 (%)
3.61V~3.50V
19~3 (%)
3.49V~3.28V
2~0 (%)
PM6635
PM6635
KE990 Battery Bar Display(Stand By Condition)