Need help on DRV8711

Esme Liu

Intellectual 335 points

Other Parts Discussed in Thread: DRV8711

Hi,

I'm trying to use Infineon XMC4500 F100K1024 to drive DRV8711, but it won't start.

This is what I saw on oscilloscope after I wrote 0000 1001 0110 to register 0x3h

(I also sent commands to other registers, this is just an example of writing output)

I also tried to use DRV8711 evm, the outputs on oscilloscope are the same, so I can't figure out why

it doesn't work for XMC4500.

This is my SPI setup:

//set the reset High
DIGITAL_IO_SetOutputHigh(&Reset);
delay(10);
DIGITAL_IO_SetOutputLow(&Reset);
delay(1);

//set sleep high
DIGITAL_IO_SetOutputHigh(&Sleep);
//set chip select low
DIGITAL_IO_SetOutputLow(&ChipSelect);
//set the motor direction
DIGITAL_IO_SetOutputHigh(&MotorDirection);

Here is my code for SPI writing function:

void Write2Bytes(uint8_t start_address, uint16_t* single_short)
{
//concatenate all the data
uint8_t dataToSend[2];
uint8_t lowByteData;
uint8_t highByteData;
//start address is only 3 bits

lowByteData = lowByte(*single_short);
highByteData = highByte(*single_short);
//hex 0 is the command for a write
dataToSend[0] = start_address | highByteData | 0x00;
dataToSend[1] = lowByteData;

//set the CS high
DIGITAL_IO_SetOutputHigh(&ChipSelect);
//write the data
SPI_MASTER_STATUS_t status;
status = SPI_MASTER_Transmit(&SPI_MASTER_0, dataToSend, sizeof(dataToSend));
while(SPI_MASTER_IsTxBusy(&SPI_MASTER_0))
{
}
while (status != SPI_MASTER_STATUS_SUCCESS)
{
status = SPI_MASTER_Transmit(&SPI_MASTER_0, dataToSend, sizeof(dataToSend));
while(SPI_MASTER_IsTxBusy(&SPI_MASTER_0))
{
}
}
//finish_memory_write();
int delay_count = 0;
for(delay_count = 0;delay_count<0x2FF;delay_count++);
DIGITAL_IO_SetOutputLow(&ChipSelect);
}

This is what I sent to the registers:

uint16_t dataToSend = 0b0000000100011000;

uint16_t dataToSend_to_reg_1 = 0b0000000000111100;
uint16_t dataToSend_to_reg_2 = 0b0000000000101000;
uint16_t dataToSend_to_reg_3 = 0b0000000010010110;
uint16_t dataToSend_to_reg_4 = 0b0000010100010100;
uint16_t dataToSend_to_reg_5 = 0b0000100000111100;
uint16_t dataToSend_to_reg_6 = 0b0000000011110000;

Write2Bytes(0x10,&dataToSend_to_reg_1);
Write2Bytes(0x20,&dataToSend_to_reg_2);
Write2Bytes(0x30,&dataToSend_to_reg_3);
Write2Bytes(0x40,&dataToSend_to_reg_4);
Write2Bytes(0x50,&dataToSend_to_reg_5);
Write2Bytes(0x60,&dataToSend_to_reg_6);
Write2Bytes(0x70,&dataToSend_to_reg_7);

over 9 years ago

0 Luis Riveros over 9 years ago

TI__Expert 4435 points

Hello Esme Liu,

Our experts have been notified and should reply soon. Thank you

0 Rick Duncan over 9 years ago in reply to Luis Riveros

TI__Guru** 114905 points

Hi Esme,

Did you write to register 0? The device is not enabled until register 0, bit 0 is set to a logic 1.

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Ok, I added this after setting up other registers:

uint16_t dataToSend_to_reg_0 = 0b0000000100011001;

//clear status
Write2Bytes(0x70,&dataToSend_to_reg_7);

//enable
Write2Bytes(0x00,&dataToSend_to_reg_0);

But it still doesn't work

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Hi Rick,
I set bit 0 to 1 and the motor is still not starting.

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

Once bit 0 is set to 1, does the current increase?

If the current did not increase, have you set nSLEEP to a logic 1 and RESET to a logic 0?

If the current did increase then you should advance the motor by either issuing pulses on the STEP pin or setting the bit 2 of register 0 (RSTEP) to a logic 1. RSTEP is self-clearing.

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Hi Rick,

Reset is low
Sleep is high
I used 12V power and there's 0 current.
I put a breakpoint after enable and used oscilloscope, the writing outputs are correct,
I set register 0 in the beginning and set it again in the end, the only difference is bit 0
(dataToSend is the first command I sent to register 0, and dataToSend to reg 0 is the second command
I sent to register 0 to set bit 0 to high)

Still not working

These are what I sent:
uint16_t dataToSend = 0b0000000100011000;
uint16_t dataToSend_to_reg_0 = 0b0000000100011001;
uint16_t dataToSend_to_reg_1 = 0b0000000000111100;
uint16_t dataToSend_to_reg_2 = 0b0000000000101000;
uint16_t dataToSend_to_reg_3 = 0b0000000010010110;
uint16_t dataToSend_to_reg_4 = 0b0000010100010100;
uint16_t dataToSend_to_reg_5 = 0b0000100000111100;
uint16_t dataToSend_to_reg_6 = 0b0000000011110000;
uint16_t dataToSend_to_reg_7 = 0b0000000000000000;

Write2Bytes(0x00,&dataToSend);
Write2Bytes(0x10,&dataToSend_to_reg_1);
Write2Bytes(0x20,&dataToSend_to_reg_2);
Write2Bytes(0x30,&dataToSend_to_reg_3);
Write2Bytes(0x40,&dataToSend_to_reg_4);
Write2Bytes(0x50,&dataToSend_to_reg_5);
Write2Bytes(0x60,&dataToSend_to_reg_6);

//clear status
Write2Bytes(0x70,&dataToSend_to_reg_7);

//enable
Write2Bytes(0x00,&dataToSend_to_reg_0);

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

Have you tried reading a register to confirm the bits are changing?

What are the voltages on VINT, V5, and VCP?
Can you send your schematic?

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Yes, the bits are changing.
VINT is 2.55V, V5 is 5.75V, VCP is 23V

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

I constructed the circuits as indicated www.ti.com/.../slvu967.pdf
I didn't connect the 3.3V,pot, nSTALL, nFAULT, BIN1 and BIN2 to anything though
Also I connected SCS pin to GPIO, so I can manually set it to high and low in my code

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

Thanks for the confirmation of bits changing and the voltages.

There are a few more items to check.

Please disconnect the motor, and enable the device using the ENBL in register 0. Do not issue step commands at this point.

Do you see xOUT1 pins at 12V and xOUT2 pins at 0V?
If not, please check the FAULTn pin? Is it low?

Any scope captures of the gate control signals after the device is enabled will help.

If you see the xOUT1 and xOUT2 pins in the proper state, issue step commands. Do the outputs toggle?

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

By xOUT1 and xOUT2 you mean BIN1 and BIN2?

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

I mean pins 21, 28, 30, and 37 of the DRV8711.

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Hi Rick

I got
Pin 21: 1.4V
Pin 28: 1.4V
Pin 30: 40mV
Pin 37:1.4V

and nFAULT is low

How do I fix this?

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

Please report the data in the status register to determine what fault is occurring.

If you are seeing a predriver fault, please refer to section 8.1.2 of the datasheet for suggestions.

0 Esme Liu over 9 years ago in reply to Rick Duncan

Intellectual 335 points

Hi Rick,

The problem is solved. It's a SPI setting problem.

The clock should be set to "Low if inactive, transmit on falling clock edge, receive on rising clock edge",

Thanks

Esme

0 Rick Duncan over 9 years ago in reply to Esme Liu

TI__Guru** 114905 points

Hi Esme,

I am glad to hear you determined the reason. I hope you find the DRV8711 fits your application.

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