SLASEG6B May 2018 – June 2020 TAS3251
The FAULT, and CLIP_OTW, pins are active-low, open-drain outputs. Each pin has a 26 kΩ pull-up resistor reference to DVDD and does not need an external pull-up resistor. The function is for protection-mode signaling to a system-control device.
Any fault resulting in device shutdown is signaled by the FAULT pin going low. Also, CLIP_OTW goes low when the device junction temperature exceeds 125°C (see Table 23).
|0||0||Overtemperature (OTE), overload (OLP) or undervoltage (UVP) Junction temperature higher than 125°C (overtemperature warning)|
|0||1||Overload (OLP) or undervoltage (UVP). Junction temperature lower than 125°C|
|1||0||Junction temperature higher than 125°C (overtemperature warning)|
|1||1||Junction temperature lower than 125°C and no OLP or UVP faults (normal operation)|
Note that asserting RESET low forces the FAULT signal high, independent of faults being present. TI recommends monitoring the CLIP_OTW signal using the system microcontroller and responding to an overtemperature warning signal by turning down the volume to prevent further heating of the device resulting in device shutdown (OTE).
To reduce external component count, an internal pullup resistor to 3.3 V is provided on both FAULT and CLIP_OTW outputs.