MP6546_changing register value

[marco.riccobon]

HI,
I can’t write a new value of register. example:

1. successfully reading control1 register
   
   
2. write something else on this register
   
   
3. when i read again the same register the value become 0x00.
   
   

What am i doing wrong? Thaks for your help

[eduardo.FAE]

Hello marco.riccobon,

I will look into this and follow up with additional information

[marco.riccobon]

Hello Eduardo,
maybe this example will help…
I want to change the value of register 01h (default value 0x5151 to 0x5353)
-if I write something on register 10h (STBY_MODE) and than write a a new value to register 01h, the register doesn’t change to a new value and remain with a default value.
-if I write something on register 0Fh (NORMAL_MODE) and than write a a new value to register 01h, the value of the register become 0x0000.

Thanks for your help

[eduardo.FAE]

Hello marco.riccobon,
Can you share a schematic? Is this the only device on the bus? Have you tried to use the actual device address vs general?

[marco.riccobon]

Hello Edoardo,

yes this is the only device on the bus. I have tried only with address 0x00.

[eduardo.FAE]

Can you try using 0x07?

[marco.riccobon]

Hi Edoardo,

1. reading the register 0x01 with addr 0x07
   

   

2. WRITE a new value to register 0x01
   

   

3. READ again the register 0x01
   

   

The value of the register become 0.

[marco.riccobon]

Hello Edoardo,

The first four register are OTP type. This means I can only enter them once every Power up, or just once generaly?

Best Regards

[eduardo.FAE]

Hello marco.riccobon,

These should allow for writing during operation. OTP refers to NVM.

Could you try writing to one of the RAM labeled registers?

[marco.riccobon]

Hello Edoardo,

yes, it’s works with other RAM labeled registers.

Best Regards

[marco.riccobon]

Hello Edoardo,

any other idea to try? can i order some evaluation board for this IC?

Best Regards