DS90UB948-Q1: bit2-bit7 in register 0x01

Rory Wu

Part Number: DS90UB948-Q1

Hi Team,

My customer set the register 0x01 to FF to digital rest the 948, but found the blanking screen issue randomly. So can you please help:

1. What is bit2-bit7 in register 0x01 reserved in 948?

2. Can we write 1 to bit2-bit7 in register 0x01?

3. Can we write 0x03 to register 0x01 to digital reset?

4. What do we usually do to digital reset? Set bit0 or bit1?

thanks.

BR,

Rory

over 3 years ago

0 Hamzeh Jaradat over 3 years ago

TI__Guru** 108520 points

Hello Rory,

There are two types of digital reset, bit0 resets the entire digital block except registers, and bit1 resets the entire digital block including registers. So which one to use depends on your use case and needs.

For just a digital reset please write 0x01=0x05. But if you want to digital reset and to reset all register please write 0x01=0x06

bit2 enables the back channel communication. So this bit must be always 1.

Other bits are reserved, hence please do not write any of those register because you may get any unexpected behavior.

0 Rory Wu over 3 years ago in reply to Hamzeh Jaradat

TI__Intellectual 1050 points

Hi Hamzeh,

Got it, but can we just write 0x01 to reg 0x01 for digital reset? Since bit2 is also reserved in the datasheet. Is there any risk to write 0x01? Thanks.

BR,

Rory

0 Hamzeh Jaradat over 3 years ago in reply to Rory Wu

TI__Guru** 108520 points

As I said, you need always to write bit2 because otherwise you will disable the back channel.

Bit2 will be updated in the new datasheet revision which will be released soon!

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DS90UB948-Q1: bit2-bit7 in register 0x01