Part Number:DRV10983
Hi folks,
We're trying this IC for the first time on a custom PCB. Schematic and layout are pretty identical to the ones shown in the datasheet, however our setup seems not to work as it should.
Let me describe the situation:
- Communications lines have been tested and work OK
- Supply lines have been tested and work OK
- Microcontroller works OK
- All pads in the PCB are properly soldered to the DRV and there's no shorts in the IC.
Motor parameters (acquired following SLOU395D (DRV10983 and DRV10975 Tuning Guide)):
- Operation voltage: 24V
- Number of poles: 4 stops hand rotating with an energized phase = 8 poles
- Max speed: 3000RPM
- Phase Resistance: 1.4 Ohms
- Kt: 196mv/Hz? Ac calculated, however, i don't fully comprehend this value.
- LR: not calculated
- Intertia: Not calculated
When we apply power to the board current consumption climbs up to 25mA or so (OK), then we use the TWI to program the DRV :
#include <Arduino.h>
#include <Wire.h>
#include "DRV10983.h"
#define PWM 6
#define DIR 5
#define DRV_address 0b1010010
void twi_write (uint8_t slave, uint8_t reg, uint8_t data){
Wire.beginTransmission(slave);
Wire.write(reg);
delayMicroseconds(50);
Wire.write(data);
Wire.endTransmission();
}
uint8_t twi_read (uint8_t slave, uint8_t reg, uint8_t bytes){
Wire.beginTransmission(slave);
Wire.write(reg);
Wire.endTransmission();
delayMicroseconds(50);
uint8_t c = Wire.requestFrom(slave,bytes);
return c;
}
void setup() {
pinMode(PWM,OUTPUT);
pinMode(DIR,OUTPUT);
digitalWrite(PWM,0);
digitalWrite(DIR,1);
TCCR0B = 0x01;
Serial.begin(115200);
Wire.begin();
twi_write(DRV_address,0x03,0xC0); // Disable sleep, enable the Sidata bit to enable writing to registers 0b11000000
twi_write(DRV_address,0x20,0b11001001); // Motor Param1 50KHz output freq + motor resistance 1.4R
twi_write(DRV_address,0x21,0b01001101); // Motor Param2 Half cycle + V constant 192mv/Hz
//Default values from datasheet loaded
twi_write(DRV_address,0x22,0x2A); // Motor Param3 No idea what this is...
twi_write(DRV_address,0x23,0x00); // SYSOPT1
twi_write(DRV_address,0x24,0x98); // SYSOPT2
twi_write(DRV_address,0x25,0xE4); // SYSOPT3
twi_write(DRV_address,0x26,0x7A); // SYSOPT4
twi_write(DRV_address,0x27,0xFC); // SYSOPT5
twi_write(DRV_address,0x28,0x69); // SYSOPT6
twi_write(DRV_address,0x29,0xB7); // SYSOPT7
twi_write(DRV_address,0x2A,0xAD); // SYSOPT8
twi_write(DRV_address,0x2B,0xcC); // SYSOPT9
analogWrite(6,125); // PWM ~50% duty cycle to DRV
}
void loop() {
}
As seen in the logic analyzer, communication is sucessful and the device returns ACK to all the written configurations:
Time [s],Packet ID,Address,Data,Read/Write,ACK/NAK 0.000111500000000,0,0xA4,0x03,Write,ACK // Disable sleep, enable the Sidata bit to enable writing to registers 0b11000000 0.000207000000000,0,0xA4,0xC0,Write,ACK 0.000543500000000,1,0xA4,0x20,Write,ACK // Motor Param1 50KHz output freq + motor resistance 1.4R 0.000639000000000,1,0xA4,0xC9,Write,ACK 0.000976000000000,2,0xA4,0x21,Write,ACK // Motor Param2 Half cycle + V constant 192mv/Hz 0.001071500000000,2,0xA4,0x4D,Write,ACK 0.001408000000000,3,0xA4,0x22,Write,ACK // Motor Param3 No idea what this is... 0.001503500000000,3,0xA4,0x2A,Write,ACK 0.001840000000000,4,0xA4,0x23,Write,ACK // SYSOPT1 0.001935500000000,4,0xA4,0x00,Write,ACK 0.002272500000000,5,0xA4,0x24,Write,ACK // SYSOPT2 0.002367500000000,5,0xA4,0x98,Write,ACK 0.002704500000000,6,0xA4,0x25,Write,ACK // SYSOPT3 0.002800000000000,6,0xA4,0xE4,Write,ACK 0.003136500000000,7,0xA4,0x26,Write,ACK // SYSOPT4 0.003232000000000,7,0xA4,0x7A,Write,ACK 0.003568500000000,8,0xA4,0x27,Write,ACK // SYSOPT5 0.003664000000000,8,0xA4,0xFC,Write,ACK 0.004001000000000,9,0xA4,0x28,Write,ACK // SYSOPT6 0.004096000000000,9,0xA4,0x69,Write,ACK 0.004433000000000,10,0xA4,0x29,Write,ACK // SYSOPT7 0.004528500000000,10,0xA4,0xB7,Write,ACK 0.004865000000000,11,0xA4,0x2A,Write,ACK // SYSOPT8 0.004960500000000,11,0xA4,0xAD,Write,ACK 0.005297000000000,12,0xA4,0x2B,Write,ACK // SYSOPT9 0.005392500000000,12,0xA4,0xCC,Write,ACK
The only thing i can get the motor to do is to hum a little, spin for a second or so and then stop. This is repeated until i remove power from the board. The motor gets really hot and so does the IC. IT's becoming a bit frustrating. Most of the documentation is oriented towards the EVM, could someone provide some insights on this issue?
Motor Noise
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Layout placement:
Motor:
