Part Number:TAS5421-Q1
Hi Team,
I use TAS5421-Q1 without I2C and without FAULT output.
In this case, the technical document SLOS814D tells us :
p. 8.2.2.1.3 :" If there is no microcontroller in the system, use of the device without I 2 C communication is possible. In this situation, connect the SDA and SCL pins to 3.3 V.
p. 8.2.2.1.4 :" If the FAULT pin does not report to a system microcontroller in the application, connect it to GND."
So I connected these pins according to the indications given.
My module has an auxiliary power supply of 3V6 (TPS70936 ) on which I connected directly SDA and SCL. FAULT is connected to GND
But with some devices, there is a problem with powering up (16.8 V): the TAS5421 does not start. While investigating the circuit I was able to highlight a short circuit between the SDA-SCL and GND (7 ohms).
Question: Do you confirm the informations in paragraph 8.2.2.1?
Thank for your response.
J.M. Thoorens