CSR BlueCore CSR8640 BGA, User Manual

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11 Battery Charger
11.1 Battery Charger Hardware Operating Modes
The battery charger hardware is controlled by the VM, see Section 11.3.The battery charger has 5 modes:
■ Disabled
■ Trickle charge
■ Fast charge
■ Standby: fully charged or float charge
■ Error: charging input voltage, VCHG, is too low
The battery charger operating mode is determined by the battery voltage and current, see Table 11.1 and Figure
11.1.
The internal charger circuit can provide up to 200mA of charge current, for currents higher than this the
CSR8640 BGA can control an external pass transistor, see Section 11.5.
Mode Battery Charger Enabled VBAT_SENSE
Disabled No X
Trickle charge Yes
>0 and <V
fast
Fast charge Yes
>V
fast
and <V
float
Standby Yes
I
term
(a) and >(V
float
- V
hyst
)
Error Yes >(VCHG - 50mV)
Table 11.1: Battery Charger Operating Modes Determined by Battery Voltage and Current
(a)
I
term
is 10% of I
fast
for a given I
fast
setting
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
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