Digital Power Manufacturing Tool - TPS40428 - PMBus / I2C read byte command error: ROM could not be detected

sebastian scholz

Other Parts Discussed in Thread: TPS40428

Hello

I using the evaluation board of the TPS40428 and do some test over the PMBus with the Digital Power Manufacturing Tool. During my first tests I am not able to read bytes from the device.

I am able to following tasks with the right device id /adress without failures:

Confirm Device
Clear faults

An error will be asserted by sending the command "read byte"

(cmd_byte=0x80) (expected_value=0x0)
(program_mode=False)
(skip_if_device_not_in_rom_mode=False)

f.e. at device register adress 80h:

"ROM could not be detected"

To enable the ROM Mode I tried the command "SET_ANY_DEVICE_TO_ROM" but this would currently not work.

Reading bytes or words by the SMBus & I2C & SAA Debug Tool will work and will give an ACK and the expected return values.

Who knows the right way?

regards Sebastian

over 9 years ago

0 Anne Ngo77 over 9 years ago

TI__Expert 5470 points

1.The TPS40428 device does not support ROM mode => that is why you get the error.

2. Digital Power Manufacturing Tool is for manufacturing use. If you want to evaluate the device, try using Fusion Digital Power Designer instead (http://www.ti.com/fusiongui)

Can you explain more detail on what you want to accomplish so we can help you better?

0 sebastian scholz over 9 years ago in reply to Anne Ngo77

Prodigy 60 points

Hello Anne,

I currently use TI Fusion to evaluate the TPS40428 device, but the manufacturing tool offers the option to edit, load and run scripts to check, test and verify different pmbus devices in a i2c chain.

I searching for something which allows me to setup and verify a pmbus system with generic devices, micro-controllers like the F28035 and other TI devices.

the commands:

read_byte/block,
write_byte/block,
clear faults,
confirm_devices,
device_reset

looks good to implement little test procedures.

Also there is currently a limitation to in the option to add a generic or user device (a new device is automatically named as "unknown"). new devices can not be renamed. only a selection of pre-defined devices is electable.

I have a test script which looks like this:

Factory Script
1. [Device] TPS40428@9
  1. [Activity] Find Device(normal)
    1. Confirm_Device (pmbus)
    2. Clear_Faults (pmbus)
  2. [Activity] Read Status Register(normal)
    1. Send_Any_Device_To_ROM (pmbus)
    2. Read_Byte (pmbus)
    3. Read_Block (pmbus)
2. [Device] TPS40428@11
  1. [Activity] Find Device(normal)
    1. Confirm_Device (pmbus)
    2. Clear_Faults (pmbus)
  2. [Activity] Read Status Register(normal)
    1. Send_Any_Device_To_ROM (pmbus)
    2. Send_Any_Device_To_ROM2 (pmbus)
    3. Read_Byte (pmbus)
    4. Read_Block (pmbus)
3. [Device] Unknown@13
  1. [Activity] Read Register(normal)
    1. Read_Byte (pmbus)

Read and write of internal pmbus register should be easy as possible in this case.

The SMBus & I2C & SAA Debug Tool works without a ROM mode error but the commands can not be saved for complex tests

0 Anne Ngo77 over 9 years ago in reply to sebastian scholz

TI__Expert 5470 points

Fusion Manufacturing GUI is designed to work with TI supported devices only. If you have the need for the GUI to work with other TI devices or non-TI devices, please contact TI sale representatives to request the feature. Thanks

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Digital Power Manufacturing Tool - TPS40428 - PMBus / I2C read byte command error: ROM could not be detected