DRV8718S-Q1EVM: ORVM

Hi Shahajahan,

Did you enable the driver by setting EN_DRV bit to 1 in the IC_CTRL1 register? In addition to this you should have the DRVOFF_nFLT pin to logic LOW if the register bit was selected with default value - the pin is DRVOFF.

You can also change the DRVOFF_nFLT pin function to nFLT by changing the register bit, see below. When in nFLT it will be an open drain output, an external pull-up resistor must be used with this pin in this mode.

If these are not correctly configured the bridge output will not be active. 

Regards, Murugavel

Dear expert,

i am initializing a CS pin  initially it was low and IC_stat1,IC_cntrl1,IC_cntrl2,BRG_cntrl1,IDRV_cntrl1,IDRV_cntrl2 after that CS pin will high in function and it is called in loop , all the OUTPUT port getting high and i am connecting the OUT1 and OUT2 for motor and i am assign the data as per data sheet for control Register 

i am verified through oscilloscope CS pin were getting Low for long time and High for short time after applying the  delay clock is Low, still motor is not rotating and i am not getting the any one Out1/out2 as low to rotate the motor so kindly resolve the issue asps

Dear expert,

i am using Arduino Mega 2560 as master and remove 0ohm near by J6 connector to control SPI from Arduino and i am connecting the DVDD, nCS, CLK, SDI, SDO, nSleep, nFLT for Power in J2 connecting the power supply 

any other connection as to be done for rotate the motor?

here the code 

void setup()
{
SPI.begin();
pinMode(CS_PIN,OUTPUT);
pinMode(nSleep,OUTPUT);
digitalWrite(nSleep,HIGH);
pinMode(CLK_PIN,OUTPUT);
pinMode(DVDD,OUTPUT);
digitalWrite(DVDD,HIGH);

SPI.beginTransaction(SPISettings(1000,MSBFIRST,SPI_MODE0));

DRVintialization();

}

void loop()
{
digitalWrite(CS_PIN,LOW);

SPI.transfer(0x09);
SPI.transfer(0x90);// BRG_cntr_1

SPI.transfer(0x0F);
SPI.transfer(0x0E);//IDRV_cntrl_1

SPI.transfer(0x10);
SPI.transfer(0xDD);//IDRV_cntrl_2

digitalWrite(CS_PIN,HIGH);

}

void DRVintialization()
{
digitalWrite(CS_PIN,LOW);

// Enable the driver
SPI.transfer(0x00); //status Enable bit
SPI.transfer(0x80);

// Unlock the driver
SPI.transfer(0x07); // IC_Cntrl_1 register address
SPI.transfer(0x86); // Unlock command

// Set current control
SPI.transfer(0x0F); // IDRV_cntrl_1 register address
SPI.transfer(0x0D); // Current control value

digitalWrite(CS_PIN,HIGH);


}

Hi Shahajahan,

If you make nSCS LOW and perform multiple SPI register writes (or reads) and then make nSCS HIGH it will not work. None of the registers will be written and will result in SPI error. See below programming information in the datasheet. The nSCS must go LOW for every register write or read and then HIGH before performing another register write or read. 

The source code for the EVM can be downloaded from EVM webpage. https://dr-download.ti.com/software-development/support-software/MD-GoDz5QXvm0/01.00.00.0B/slvc809b.zip.  

Regards, Murugavel