ZHCSQ30 December 2022 DRV8317
PRODUCTION DATA
The DRV8317 family of devices provides three different control modes to support various commutation and control methods. Table 8-2 shows the various modes of the DRV8317 device.
| PWM Control Mode | PWM_MODE register (DRV8317S) | MODE Pin (DRV8317H) |
|---|---|---|
| 6x PWM | PWM_MODE = 00b | MODE pin tied to AGND directly or tied to AGND via 47-kΩ resistor |
| 6x direct PWM | PWM_MODE = 01b | Not Available |
| 3x PWM | PWM_MODE = 10b | MODE pin floating (Hi-Z) or tied to AVDD |
| 3x direct PWM | PWM_MODE = 11b | Not Available |
The difference between 6x PWM (or 3x PWM) and 6x direct PWM (or 3x direct PWM) is that in the direct (6x or 3x) PWM mode, the delay compensation logic circuit is bypassed and the inputs at INHx, INLx are directly passed on to the gate driver circuit. In the gate driver circuit, a dead time (tDRV_DEAD) is added before driving the FETs to prevent shoot through faults - this dead time is available in all the four PWM control modes.
TI does not recommend changing the MODE pin or PWM_MODE register during power up of the device (during tWAKE). The MODE pin setting on DRV8317H is latched at power up, so set nSLEEP = 0 before changing the MODE pin configuration on the DRV8317H. In DRV8317S, set all INHx and INLx pins to logic low before changing the PWM_MODE register.