• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 382 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS100BR410: Multiple application for DS100BR410

John Liu59
Intellectual 2735 points
Part Number: DS100BR410

Dear,

In our application, there are three DS100BR410 connected in SMBUS, but the ICs have same address, could you please advice how to use it in this application?

Thanks.

  • 0
    TI__Intellectual 2735 points
    Dear all,

    Any one can help answer the questions?

    There are three DS100BR410 need configuration, but only one address, I checked the data sheet, there is CS pin, how to use it in real application?
    Besides, for the input coupling cap, what the typical value used in 6Gbps SAS application?

    Thanks.
  • 0 in reply to John Liu59
    TI__Intellectual 2735 points
    Dear all,

    Could you please help confirm how to use it when multiple parts is used, there is only one address for this part.

    Thanks.
  • 0 in reply to John Liu59
    TI__Mastermind 43795 points

    Hi John,

    The typical AC coupling value for SAS/SATA applications is 0.01uF

    I have pulled the paragraph below from the device datasheet.  Controlling the CS pin on each device will be the only way to have all DS100BR410 devices on the same SMBus link.  Only one DS100BR410 device can be driven "high" at a time

    The System Management Bus interface is compatible to SMBus 2.0 physical layer specification. The use of the Chip Select signal is required. Holding the CS pin High enables the SMBus port allowing access to the configuration registers. Holding the CS pin Low disables the device's SMBus allowing communication from the host to other slave devices on the bus. In the STANDBY state, the System Management Bus remains active. When communication to other devices on the SMBus is active, the CS signal for the DS100BR410s must be driven Low. The address byte for all DS100BR410s is AC'h. Based on the SMBus 2.0 specification, the DS100BR410 has a 7-bit slave address of 1010110'b. The LSB is set to 0'b (for a WRITE), thus the 8-bit value is 1010 1100'b or AC'h.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    TI__Intellectual 2735 points

    Hi Lee,

    On our EVM use the 0.1uF cap, could you please advice what the value should be put for the 6Gbps SAS signal;

    Besides, for the CS pin control, is it a must for the SMBUS2.0? I didn't find the description in the spec.

    If we put the IC in different SMBUS line, then it should be OK to communicate with no interference, am I right?

    Thanks.  

  • 0 in reply to John Liu59
    TI__Mastermind 43795 points

    Hi John,

    The 0.1uF caps on our EVM are overkill for SAS/SATA at 6Gbps.  These interfaces run 8b10b encoding so the lowest effect rate is pretty high.  Having the larger capacitor will not really help or hurt the overall performance. 

    It should not matter SMBus or I2C We just need external control over the CS pin if multiple DS100BR410s occupy the same bus since there would be address conflicts.

    If the ICs are operated in different SMBus lines then it will be ok to communicate.

    REgards,

    Lee