Texas Instruments TAS5121, TAS5508-5121K8EVM manual Device Fault Reporting, 1. Channel Allocation

Device Fault Reporting

3.2 Device Fault Reporting

The OTW and SD outputs from the TAS5121 indicate fault conditions. See the TAS5121 data sheet (SLES086) for a description of these pins.

The temperature warning signals at the TAS5508−5121K8EVM board are wired-OR to one temperature warning signal [OTW – pin 22 in control interface connector (J30)].

Shutdown signals are wired-OR into two shutdown signals [SD1 and SD2 – pin 20 and pin 21 in control interface connector (J30)]. See Table 3−1 for channel allocation.

Table 3−1. Channel Allocation

Description	Terminal	Shutdown Signal
Front left	J100
			SD1
Front right	J200
			SD1
Rear left	J300
			SD2
Rear right	J400
			SD2
Surround left (or line out left)	J500
			SD2
Surround right (or line out right)	J600
			SD2
Center	J700
			SD1
Subwoofer	J800
			SD2

The shutdown signals, together with the temperature warning signal, give chip state information as described in Table 3−2. Device fault reporting outputs are open-drain outputs.

Table 3−2. TAS5121 Warning/Error Signal Decoding

			Device Condition
OTW		SDx
0	0		High-temperature error and/or high-current error

01 High-temperature warning

10 Undervoltage lockout or high-current error

1 1 Normal operation, no errors/warnings

Protection 3-3