TS4621B datasheet(28/48 Pages) STMICROELECTRONICS

28 / 48 page

Application information

TS4621B

28/48

Doc ID 022194 Rev 2

If a short-circuit is detected three consecutive times on one channel, a flag is raised in the

I²C read register CR1.

●

SC_L: equals 0 during normal operation, equals 1 when a short-circuit is detected on

the left channel.

●

SC_R: equals 0 during normal operation, equals 1 when a short-circuit is detected on

the right channel.

The corresponding channel’s output stage is then set to high impedance mode. An I²C read

command allows the reading of the SC_L and SC_R flags but does not reset them. An I²C

write command has to be sent to CR1 to reset the flags to 0 and restore normal operation.

Thermal shutdown protection: bit T_SH

A thermal shutdown protection is implemented to protect the device from overheating. If the

temperature rises above the thermal junction of 150°C, the device is put into standby mode

and a flag is raised in the read register CR1.

●

T_SH: equals 0 during normal operation, equals 1 when a thermal shutdown is

detected.

When the temperature decreases to safe levels, the circuit switches back to normal

operation and the corresponding flag is cleared.

Software shutdown: bit SWS

When SWS equals 1, the device is set to I²C software shutdown. When SWS equals 0, the

negative supply and buck converters are activated.

Channel activation: bits HP_EN_L and HP_EN_R

When HP_EN_L or HP_EN_R equals 1, the corresponding amplifier channel is enabled.

TS4621B Datasheet(PDF) 28 Page - STMicroelectronics