CS4525-CNZR Cirrus Logic Inc, CS4525-CNZR Datasheet - Page 44

• Manufacturer Part Number: CS4525-CNZR
• Description: IC PWM Controller+power Stage
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r
• Type: Class Dr

Specifications of CS4525-CNZR

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Max Output Power X Channels @ Load: 30W x 1 @ 4 Ohm; 15W x 2 @ 8 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: ADC, Depop, I²C, I²S, Mute, PWM, Short-Circuit and Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1586 - REFERENCE BOARD FOR CS4525 PWM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

44
6.1.6
6.1.6.1
Video processing and reproduction circuitry in digital video display devices can often introduce noticeably
more delay than is introduced by the device’s audio processing and reproduction circuitry. This can result
in a phenomenon known as lip-synch delay - a delay present between the video and audio content being
reproduced.
To help overcome this problem, the CS4525 delay and warning port can be configured as serial audio
delay interface. This interface consists of a serial audio input/output port to facilitate the use of an external
serial audio delay device. The port routes the serial data from the selected input source (the ADC or the
serial input port) out to an external serial audio delay device, and then back in to the CS4525 internal dig-
ital sound processing blocks. The delay serial audio interface signals include DLY_SDOUT and
DLY_SDIN/EX_TWR and are clocked from AUX_LRCK and AUX_SCLK. The serial data is output on the
DLY_SDOUT pin and input on the DLY_SDIN/EX_TWR in the format specified by the AuxI²S/LJ bits in
the Aux Config register. Because the delay interface uses the auxiliary port clock signals, the auxiliary se-
rial port must be enabled using the EnAuxPort bit in the Aux Port Configuration register to allow the delay
interface to operate properly.
6.1.6.2
When implementing external PWM power stage devices with thermal warning indicator outputs, it can be
useful to provide these warning signals as an input to the internal thermal foldback algorithm. This allows
the CS4525 to automatically respond to the external devices’ thermal warning conditions without com-
pletely disrupting the system’s operation.
When configured as an external warning input port, the DLY_SDIN/EX_TWR is an active-low thermal
warning input to the foldback algorithm and the DLY_SDOUT pin becomes high-impedance.
In order for the foldback algorithm to act on the external thermal warning input signal, the thermal foldback
algorithm must be enabled by the EnTherm bit in the Foldback Cfg register. See
page 40
Serial Audio Delay & Warning Input Port
The CS4525 includes a configurable delay and warning port to allow easy system integration of external
lip-sync delay devices or warning inputs from external amplifiers. The port can be configured as a serial
audio delay interface, an external warning input port, or disabled by the DlyPortCfg[1:0] bits in the Aux
Config register. When disabled, the DLY_SDOUT and DLY_SDIN/EX_TWR pins become high-imped-
ance.
Referenced Control
DlyPortCfg...........................
Referenced Control
AuxI²S/LJ.............................
EnAuxPort ...........................
Referenced Control
EnTherm .............................
for more information.
Serial Audio Delay Interface
External Warning Input Port
Register Location
Register Location
Register Location
“Delay & Warning Port Configuration (DlyPortCfg[1:0])” on page 72
“Aux/Delay Serial Port Digital Interface Format (AuxI²S/LJ)” on page 72
“Enable Aux Serial Port (EnAuxPort)” on page 72
“Enable Thermal Foldback (EnTherm)” on page 74
“Thermal Foldback” on
CS4525
DS726PP3