DRV2605EVM / External I2C input

K.Yaita

Guru 29690 points

Other Parts Discussed in Thread: DRV2605, DRV2605EVM-CT

Hi Team,

I'd like to control DRV2605 with external I2C master.

In User's guide(page.19) of DRV2605EVM, I can see the description of "External I2C Input" mode.

Is there any access from MSP430 to DRV2605 in this process(instructions 1 to 4)?

I hope there isn't any access.

In addition, I'd like to control EN pin from external GPIO.

Is it possible to use ENIN pin without removing R8 resistor?

Best Regards,

Yaita / Japan disty

over 9 years ago

0 Peter Li79 over 9 years ago

TI__Expert 8940 points

Hi, Yaita-san:

Yes, we can control DRV2605 in the EVMCT board with external I2C master.

The MSP430's activities must be triggered by Captouch Button after initialization.

So, if we leave the board untouched and just use the external I2C input, there will be no MSP430 access to DRV2605.

0 K.Yaita over 9 years ago in reply to Peter Li79

Guru 29690 points

Hi Peter-san,

Thank you for your prompt reply.

How about the following question?

Do I have to remove R8?

>In addition, I'd like to control EN pin from external GPIO.

>Is it possible to use ENIN pin without removing R8 resistor?

Best Regards,

Yaita

0 Peter Li79 over 9 years ago in reply to K.Yaita

TI__Expert 8940 points

Hi, Yaita-san:

I think the R8 should be removed.

the MSP430P3.1 is configured to output low if the DRV2605 is not working.

So, this pin can possibly drive the line low even if we put an external High voltage to ENIN.

But I haven't tested it.

0 Rodney Miranda over 9 years ago in reply to Peter Li79

TI__Expert 3280 points

Yaita-san,

Peter is correct. The MSP430 is trying to drive the EN pin low, so if you try to force it externally, you will damage the MSP430. You will need to remove R8 prior to driving externally.

0 K.Yaita over 9 years ago in reply to Rodney Miranda

Guru 29690 points

Peter-san, Rodney-san,

Thak you for your confirming.

I understood.

Best Regards,

Yaita

0 K.Yaita over 9 years ago in reply to K.Yaita

Guru 29690 points

Hi Peter-san,

I'd like to ask you one more.

It seems "Initialization Procedure(ex. auto calibration) has done during process of entering "external I2C Input mode" in EVM.

Could you tell me which registers are written in this procedure? I would also like to know the register value as a guide.

I selected on-board LRA in instruction 2.

Best Regards,

Yaita

0 Peter Li79 over 9 years ago in reply to K.Yaita

TI__Expert 8940 points

Hi, Yaita-san:

I have tested this with my USB-to-I2C board and DRV2605EVM-CT.

it works as described.

the Initialization is done when the board is powered up. then we change the mode to MODE0 (only M0 LED is lighting)..

during the initialization, the DRV2605 calibrates both the LRA and ERM.

it's not easy to describe this procedure in short message.

Do you have the MSP430 firmware for DRV2605EVM-CT?

If yes, you can find the "void Haptics_Init(void)" in Haptics.c.

5226.DRV2605EVM-CT_REVA_P9-2012-12-28.zip

0 Marlon Tom over 9 years ago in reply to Peter Li79

Prodigy 10 points

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0 K.Yaita over 9 years ago in reply to Peter Li79

Guru 29690 points

Hi Peter-san,

I could find initialization process in Haptics.c.

I appreciate for your support.

Best Regards,

Yaita

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DRV2605EVM / External I2C input