TDA1566 Datasheet - NXP Semiconductors.

General description
The TDA1566 is a car audio power amplifier with a complementary output stage realized in BCDMOS. The TDA1566 has two Bridge Tied Load (BTL) output stages and comes in a HSOP24 or DBS27P package.

FEATUREs
Operates in I2C-bus mode and non-I2C-bus mode
TH version: four I2C-bus addresses controlled by two pins; J version: two I2C-bus addresses controlled by one pin
Two 4Ωor 2Ωcapable BTL channels or one 1Ωcapable BTL channel
Low offset
Pop free off/standby/mute/operating mode transitions
Speaker fault detection
Selectable gain (26 dB and 16 dB)
In I2C-bus mode:
  DC load detection: open, short and speaker or line driver present
  AC load (tweeter) detection
  Programmable trigger levels for DC and AC load detection
  Per channel programmable gain (26 dB and 16 dB, selectable per channel)
  Selectable diagnostic levels for clip detection and thermal pre-warning
  Selectable information on the DIAG pin for clip information of each channel separately and independent enabling of thermal-, offset- or load fault
Independent short-circuit protection per channel
Loss of ground and open VPsafe
All outputs short-circuit proof to VP, GND and across the load
All pins short-circuit proof to ground
Temperature controlled gain reduction at high junction temperatures
Fault condition diagnosis per channel: short to ground, short to supply, shorted lead and speaker fault (wrongly connected)
Low battery voltage detection
TH version: pin compatible with the TDA8566TH1