TS4601B View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS4601B

High performance stereo headphone amplifier with capacitorless outputs and I2C bus interface

STMicroelectronics 

TS4601B

Application information

In the volume register, MUTE_L, and MUTE_R are dedicated bits to enable the mute

independently from the channel. When MUTE_L, MUTE_R are set to VIH, the mute function

is enabled on the corresponding channel. When MUTE_L, MUTE_R are set to VIL, the gain

level is applied to the channel.

Control register CR0

Amplifier output short-circuit detection:

The outputs of the amplifier are protected against short-circuits that might occur accidentally

during manipulation of the device. In the typical application, if a short-circuit arises on the

jack plug, there is no detection due to the serial resistor present on the amplifier output, thus

the output current threshold is not reached.

To be active, the detection has to occur directly on the amplifier output with a signal

modulation on the inputs of the TS4601B.

If a short-circuit is detected on one channel, a flag is raised in the I²C read register CR0.

● 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 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 reset the flags to 0 and restore normal operation.

When the TS4601B is in I²C standby mode, the SC_L and SC_R flags are in an

undetermined state.

Thermal shutdown protection:

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 CR0.

● 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.

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