DS250DF230: I2C address question and pinstrap tolerance

Evan Wang

Expert 4670 points

Part Number: DS250DF230

Hi all,

Our customer is using DS250DF230 but has few questions below:

1.The ADDR1 & ADDR0 is set properly and the address should be read as 0x30.(ADDR1=>0 & ADDR0=>0).

And they do observe the address of 0x30 on the interface but do not respond to any command.

Then they try the 0x19 address and it working.

it there any possibility they enter into a 7-bit mode? if yes, which part should we check and we can back to the 8-bit pin strapped function?

2.what is the tolerance of the pin strapped resistance?

Could you provide the voltage range of each address? is the resistor up to 5% accuracy still can be work?

Thank you for your help.

over 3 years ago

0 Rodrigo Natal over 3 years ago

TI__Mastermind 19135 points

Hi, see my inputs below.

1. The addressing format (7-bit versus 8-bit) is determined by software. The retimer itself does not reconfigure itself. If the host software uses 7-bit addressing the retimer responds to the 7-bit address corresponding to its ADDR pin settings. if the host uses 8-bit addressing the retimer responds to the 8-bit address corresponding to its ADDR pin configuration

Table. Retimer SMBus Write Address Assignment

ADDR_3	ADDR_2	ADDR_1	ADDR_0	SMBus WRITE ADDRESS	SEVEN-BIT SMBus ADDRESS
0	0	0	0	0x30	0x18
0	0	0	1	0x32	0x19
0	0	1	0	0x34	0x1a
0	0	1	1	0x36	0x1b
0	1	0	0	0x38	0x1c
0	1	0	1	0x3a	0x1d
0	1	1	0	0x3c	0x1e
0	1	1	1	0x3e	0x1f
1	0	0	0	0x40	0x20
1	0	0	1	0x42	0x21
1	0	1	0	0x44	0x22
1	0	1	1	0x46	0x23
1	1	0	0	0x48	0x24

2. The resistor tolerance should be at least 5%. I don't expect this resistor value tolerance to be the source of issue.

Cordially,

Rodrigo Natal

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DS250DF230: I2C address question and pinstrap tolerance