CS35L32 Datasheet, PDF (3/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
The battery voltage, speaker voltage, and speaker current signals are monitored, digitized using  converters, and
serialized over an I²S bus. The speaker monitoring signals are part of a speaker-protection algorithm that is managed
externally to the CS35L32. Outgoing data is sent over I²S with the CS35L32 in Slave or Master Mode. Battery voltage
monitor data is accessible through I²C.
An integrated dual LED driver operates up to two LEDs in Flash Mode or Movie Mode. A flash event is triggered by an
external signal. A flash-inhibit event is triggered by an external signal, and causes a reduction in flash current. A timer is
provided for flash and flash inhibit events. Movie Mode operation has no timer and starts and ends via an I²C command.
Flash and Movie Mode current levels, as well as the flash timer are I²C programmable.
Total power consumption when powering LEDs in Flash Mode or Movie Mode, and powering audio simultaneously, is
managed by the user’s choices in programming the current limit and in power budgeting. The primary goal is to manage
audio and LED loads so the boost converter is not current limited and so the CS35L32 does not shut down due to
overheating.
A latched shutdown of the audio amplifier occurs in the event of an output short pin to ground, pin to supply, or pin to pin.
A latched shutdown of the CS35L32 also occurs on overtemperature. An LED driver shutdown occurs in the event of a
shorted or open LED. The CS35L32 shuts down in the event of a battery (VP) undervoltage and autorecovers when the
battery voltage recovers. The CS35L32 shuts down in the event of a stopped MCLK and autorecovers when MCLK
recovers.
The CS35L32 responds to detection of a low battery in the presence of a flash event by reducing flash current and
autorecovers when the battery voltage recovers.
The CS35L32 is reset by asserting RESET. CS35L32 power up and power down are managed through the RESET pin.
The CS35L32 is available in a 30-ball WLCSP package in the temperature range –10 to +70°C.
DS963F5
3