How many sc16is752 could be used at most on iic bus at the same time?

[liuyongzhao027]

Hi everyone,

In the datasheet of SC16IS752_SC16IS762(Rev. 9 — 22 March 2012),  "10.3 Addressing  Table 32. SC16IS752/SC16IS762 address map", it says there are 16 address could be selected by using A1 and A0 pins.

But, in my case, the address {VDD SCL 0x94 (1001 010X)}, {VDD SDA 0x96 (1001 011X)}  and any using SDA or SCL, it dosen't work.

Thanks for your help!

[art]

Everything, including the addressing modes, should operate as described in the Data Sheet document.

Please check with the oscilloscope the transitions of the SDA and SCL signals in addressing modes when the A1/A0 signals are connected to the SDA/SCL signals. Do they transition normally?

Also, check the values of the SDA/SCL pull-up resistors. Due to high bus capacitance, caused by connecting multiple signals of multiple ICs to the same SDA/SCL lines, it might be required to reduce their values down to 1kOhm or even
less.

Best Regards,
Artur