DS90UB953-Q1: Can the GPIO of the 953 be used to send clock to 954?

Nancy Gau

Part Number: DS90UB953-Q1

Hi Team,

We would like to send digital mic. data with 953 & 954. Can we use the GPIO of the 953 to write registers to send clock( 0-1-0-1...) to 954?

Thanks!

Best,

Nancy

over 6 years ago

0 Davor Glisic over 6 years ago

TI__Expert 7935 points

Hello-

Any of the 953 GPIOs can be configured as input that can take a signal (including a clock signal) that is then sent over the FPD-Link III forward channel to a compatible deserializer (e.g. 954). The signal then can be output on one of the 954 GPIOs configured as an output. For more information review Section 7.3.6.4 of the 953 datasheet.

Regards,
Davor

0 Lin Sen over 6 years ago in reply to Davor Glisic

Intellectual 260 points

hi,
But how to handle the I2S master? D-MIC need BCLK input, who will provide the clock?

0 Davor Glisic over 6 years ago in reply to Lin Sen

TI__Expert 7935 points

Hello-

Do you have a datasheet of the D-MIC that describes required interface in detail? What are the input clock requirements? Frequency, jitter, any other timing requirements? What signals are coming out of the D-MIC? Any timing specifics?

Regards,
Davor

0 Lin Sen over 6 years ago in reply to Davor Glisic

Intellectual 260 points

Hi,
I am going to use SPH0645LM4H-B from knowles as D-MIC. fclk is 2048~4096khz. TIE clock jitter should less than 10ns. Duty cycle 40~60%.
Rgs/Sen

0 Davor Glisic over 6 years ago in reply to Lin Sen

TI__Expert 7935 points

This thread had been answered here: e2e.ti.com/.../

Regards,
Davor

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DS90UB953-Q1: Can the GPIO of the 953 be used to send clock to 954?