CS35L32 datasheet(2/51 Pages) CIRRUS

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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

I2C interface. In addition, an I2S bus is used to send monitor and status data.

When two CS35L32 devices are available on the same board, each is identified by its I2C chip address. Upon power-up

or upon deasserting RESET, each CS35L32 reads the AD0 pin logic level and configures its I2C device address.

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

• Bused over I2S bus

• Battery voltage monitoring:

• 7-bit resolution

• Bused over I2S and I2C bus

• System reset

I2C Control Settings and Registers

• 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

I2S Reporting

• 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

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