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TDF8544 (I2C-bus controlled 4 × 50 W power amplifier) not working correctly

Question asked by Ajit Shrivastava on May 31, 2017
Latest reply on Jun 15, 2017 by Tomas Vaverka

We are using TDF8544 for few of our projects but facing an issue. 

 

ISSUE: Able to detect short-to-load  during startup (through DIAG pin) but not able to detect short - to - load during run time.

 

Explanation : We have connected an speaker to the chip , configured the chip (IB1 to IB4) to see load shorting condition and we are able to see the short condition during start up\ diagnostic but once the chip is completely up DB1 to DB4 register always give value 0x30 even if there is a short condition.Short - to ground is working for both conditions.Also configured IB2 [D4] for load information on pin DIAG.

 

What am i missing??  Any help would be deeply appreciated

 

Following is the log. first four are during start up value of DB1  - DB4 and rest are during normal running condition.

amp_rx_data[0] = 38 Masked = 8
amp_rx_data[1] = 20 Masked = 0
amp_rx_data[2] = 20 Masked = 0
amp_rx_data[3] = 20 Masked = 0
amp_data[0] = 30 Masked = 0
amp_data[1] = 30 Masked = 0
amp_data[2] = 30 Masked = 0
amp_data[3] = 30 Masked = 0
amp_data[0] = 30 Masked = 0
amp_data[1] = 30 Masked = 0
amp_data[2] = 30 Masked = 0
amp_data[3] = 30 Masked = 0

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