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3.1

Short Circuit Protection & Fault Reporting Circuitry

3.2

Device Fault Reporting

Short Circuit Protection & Fault Reporting Circuitry

TAS5122 is a self-protecting device that provides device fault reporting (including

high-temperature protection and short circuit protection). TAS5122 is configured in back-end

auto-recovery mode and therefore resets automatically after all errors (M1 and M2 is set low).

This mean that the device will re-start it self after a error occasion and report shortly through the

SD error signal.

The OTW, SD_AB, and SD_CD outputs from TAS5122 indicate fault conditions. Please refer to

the TAS5122 data manual for a description of these pins.

Table 3-1. TAS5122 Error Signal Decoding

OTW

SD_XX

DESCRIPTION

0

0

High temperature error and/or high current error

0

1

High temperature warning

1

0

Under voltage lockout or high current error

1

1

Normal operation, no errors/warnings

The temperature warning (OTW) signals at the TAS5508-5122C6EVM board are wired-or to one

temperature warning signal (TEMP_WARNING– pin 22 in control interface connector). Shutdown

signals (SD_AB and SD_CD) are wired-or to one shutdown signal (SHUTDOWN– pin 20 in

control interface connector). The shutdown signals will together with the temperature warning

signal give information on the chip state information as described in the table above. Device fault

reporting outputs are open-drain outputs.

Protection

18

SLEU058 – October 2004