MIPSZ2012D2R2 datasheet(27/48 Pages) STMICROELECTRONICS

27 / 48 page

TS4621B

Application information

Doc ID 022194 Rev 2

27/48

Figure 73.

I²C read operations1

4.1.2

Control register CR1 - address 1

Amplifier output short-circuit detection: bits SC_L and SC_R

The amplifier’s outputs are protected from short-circuits that might accidentally occur during

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

there will be no detection because of the serial resistor present on the amplifier output, thus

the output current threshold will not be reached.

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

modulation on the inputs of the TS4621B. This detection is depicted in Figure 74.

Figure 74.

Flowchart for short-circuit detection

AM06116

SDA

0 ACK

Start condition

DEVICE ADDRESS

DATA BYTES

R/W

Acknowledge

fom slave

Not

Acknowledge

Stop

condition

CRX

CRX+1

ACK

Repeat

start condition

ACK

DEVICE ADDRESS

R/W

AM06117

Counter = 0

TS4621B power OFF

Counter = counter + 1

TS4621B power ON

Timeout = 40 ms

TS4621B power ON

Wait 40 ms

Set flag SC_L or SC_R to 1

Set flag HiZ_L or HiZ_R to 1

Shortcut detection

Shortcut detection & timeout = 0

Shortcut detection

Reset

Counter < 3

Counter = 3

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