CSR8635 View Datasheet(PDF) - CSR plc

Part Name

Description

Manufacturer

CSR8635

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

CSR plc 

Note:

The battery voltage remains constant in Fast Charge Constant Voltage Mode, the curved line on Figure 11.1 is for

clarity only.

11.1.1 Disabled Mode

In the disabled mode the battery charger is fully disabled and draws no active current on any of its terminals.

11.1.2 Trickle Charge Mode

In the trickle charge mode, when the voltage on VBAT_SENSE is lower than the Vfast threshold, a current of

approximately 10% of the fast charge current, Ifast, is sourced from the VBAT pin.

The Vfast threshold detection has hysteresis to prevent the charger from oscillating between modes.

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■ Monitoring the temperature of the battery

■ Monitoring the temperature of the die to protect against silicon damage

■ Monitoring the time spent in the various charge states

■ Enabling/disabling the charger circuitry based on the monitored information

■ Driving the user visible charger status LED(s)

11.4 Battery Charger Firmware and PS Keys

The battery charger firmware sets up the charger hardware based on the PS Key settings and traps called from the

VM charger code. It also performs the initial analogue trimming. Settings for the charger current depend on the battery

capacity and type, which are set by the user in the PS Keys.

For more information on the CSR8635 QFN, including details on setting up, calibrating, trimming and the PS Keys, see

Lithium Polymer Battery Charger Calibration and Operation for CSR8670 application note.

Production Information

© Cambridge Silicon Radio Limited 2013

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

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