2

DS963F5

CS35L32

General Description

The CS35L32 is a low-quiescent power-integrated audio IC, with a mono full-bridge Class D speaker amplifier operating

with a self-boosted Class G supply. Audio input is received differentially. Pop-and-click reduction is achieved with zero-

crossing transitions at turn-on, turn-off and upon gain changes. Communication with the host processor is done using an

The speaker amplifier, using closed-loop

 modulation, achieves low levels of distortion. Class D amplifier efficiency

allows operation at higher speaker power levels without generating excessive heat and without wasting power. Automatic

Class G operation using a boosted supply to the speaker allows for even higher powers and higher crest factor. With a

boosted speaker supply, operation at a fixed 5 V is achieved independently of line supplied battery voltage. The user can

disable Class G operation.

Monitors and Protection

•Protection:

• Latched overtemperature shutdown

• Latched amplifier output short circuit shutdown

• LED short or open detection and LED driver shutdown

• Flash inhibit LED current reduction

• Low battery flash LED current reduction

• VP undervoltage lockout (UVLO) shutdown

• Programmable boost inductor current limiting

• Audio and LED shutdown upon stopped MCLK, with

autorecovery

• Interrupt driven error reporting

• Speaker current and voltage monitoring:

• 16-bit resolution

• 60-dB dynamic range (unweighted) for voltage

• 56-dB dynamic range (unweighted) for current

• Battery voltage monitoring:

• 7-bit resolution

• System reset

• Low-power standby

• LED and audio power budgeting programmable settings

• Boost inductor current limit programmable setting

• Speaker programmable settings:

• Pop suppression through zero-crossing transitions

• Gain and mute

• Battery voltage monitor register, 8 bits

• LED driver programmable settings:

• Flash current register

• Flash inhibit current register

• Movie Mode current register

• Flash timer register

• Error status bit, including the following:

• Stopped MCLK error

• Low battery detection with programmable thresholds

• VP UVLO error

• Overtemperature warning

• Overtemperature error

• Boost converter overvoltage error

• Boost inductor current-limiting error

• Amplifier short-circuit error

• Shorted or open LED error

• Monitoring:

• Speaker voltage monitor

• Speaker current monitor

• Battery voltage monitor

• Error reporting:

• VP UVLO shutdown error

• Overtemperature warning

• Overtemperature error

• Boost converter overvoltage error

• Boost inductor current limiting error

• Amplifier short-circuit error

• Speaker voltage monitor overflow error

• Speaker current monitor overflow error

• Battery voltage monitor overflow error

• Status reporting:

• Power-down done

• LED flash event

• LED Movie Mode event

• Flash timer on

Package

• 30-ball WLCSP

Applications

• Smart phones

•Tablets