ZHCSHB1B January 2018 – August 2018 TPA3220
PRODUCTION DATA.
The FAULT, and OTW_CLIP, pins are active-low, open-drain outputs. The FAULT 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, OTW_CLIP goes low when the device junction temperature exceeds 125°C (see Table 4).
| FAULT | OTW_CLIP | DESCRIPTION |
|---|---|---|
| 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 OTW_CLIP 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 OTW_CLIP outputs.