JAJSDI7B July 2017 – October 2018 TAS2505-Q1
The TAS2505-Q1 has SHORT-CIRCUIT PROTECTION /OVER CURRENT PROTECTION (OCP) feature for the speaker drivers that is always enabled to provide protection. This protects outputs against short to ground, short to supply and short between output terminals. The output stage shuts down on the over current condition. (Current limiting is not an available option for the higher-current speaker driver output stage.) In case of a short circuit, the output is disabled. A status flag for OC condition occurrence is provided as a read-only bit on page 1, register 45, bit D1. The D1 bit is cleared when any of the above short circuit condition happens. If shutdown occurs due to an over current condition, then the device requires a reset to re-enable the output stage. Resetting can be done in two ways. First, the device master reset can be used, which requires either toggling the RST pin or using the software reset. If master reset is used, it resets all of the registers. Second, a dedicated speaker power-stage reset can be used that keeps all of the other device settings. The speaker power-stage reset is done by setting page 1, register 45, bit D1 for SPKP and SPKM. If the fault condition has been removed, then the device returns to normal operation. If the fault is still present, then another shutdown occurs. Repeated resetting (more than three times) is not recommended, as this could lead to overheating. To minimize battery current leakage, the SPKVDD voltage level should not be less than the AVDD voltage level.
The TAS2505 has a OVER TEMPERATURE PROTECTION (OTP) feature for the speaker driver which is always enabled to provide protection. If the device is overheated, then the output stops switching. When the device cools down, the output resumes switching. An over temperature status flag is provided as a read-only bit on page 0, register 45, bit D7. The OTP feature is for self-protection of the device. If die temperature can be controlled at the system/board level, then over temperature does not occur.