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 

11.5 External Mode

The external mode is for charging higher capacity batteries using an external pass device. The current is controlled by

sinking a varying current into the CHG_EXT pin, and the current is determined by measuring the voltage drop across

a resistor, Rsense, connected in series with the external pass device, see Figure 11.2. The voltage drop is determined

by looking at the difference between the VBAT_SENSE and VBAT pins. The voltage drop across Rsense is typically

200mV. The value of the external series resistor determines the charger current. This current can be trimmed with a

PS Key.

In Figure 11.2, R1 (220mΩ) and C1 (4.7µF) form an RC snubber that is required to maintain stability across all battery

ESRs. The battery ESR must be <1.0Ω.

VCHG

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27,

2013

Production Information

© Cambridge Silicon Radio Limited 2013

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

Page 67 of 105

CS-303725-DSP5

www.csr.com

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