CSR8635 查看數據表（PDF） - CSR plc

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CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

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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.

013 The internal charger circuit can provide up to 200mA of charge current, for currents higher than this the CSR8635 QFN

, 2 can control an external pass transistor, see Section 11.5.

ber 27 Mode

ptem Disabled

y, Se Trickle charge

Frida Fast charge

.cn - Standby

int.com Error

Battery Charger Enabled

No

Yes

Yes

Yes

Yes

VBAT_SENSE

X

>0 and <Vfast

>Vfast and <Vfloat

Iterm (a) and >(Vfloat - Vhyst)

>(VCHG - 50mV)

celpo Table 11.1: Battery Charger Operating Modes Determined by Battery Voltage and Current

- ex (a) Iterm is approximately 10% of Ifast for a given Ifast setting

ou Figure 11.1 shows the mode-to-mode transition voltages. These voltages are fixed and calibrated by CSR, see Section

.zh 11.2. The transition between modes can occur at any time.

keven Fast Charge Mode

bo Constant Current

ing Ifast

Prepared for q Fast Charge Mode

Constant Voltage

Standby Mode

Itrickle

Trickle Charge Mode

Vfast

Vhyst

Iterm

Battery Voltage

Vfloat

Figure 11.1: Battery Charger Mode-to-Mode Transition Diagram

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© Cambridge Silicon Radio Limited 2013

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

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