Texas Instruments DRV821 EVM Series, Руководство пользователя, Страница: 8 / 16

4.2 PWM Control Mode (MODE = Logic High, DRL, PDSG)
When the MODE pin is logic high on power up, the device latches into PWM mode ( Figure 4-3 ). PWM is the
standard control mode for the DRV82xxDRL and DRV82xxPDSG devices. PWM mode allows for the H-bridge to
enter the Hi-Z state without taking the nSLEEP pin logic low. The truth table for PWM mode for the DSG variants
is shown in
Table 4-2 and for the PDSG variants in Table 4-3 . This method is best for bidirectional driving for one
motor.
Figure 4-3. MODE /nSLEEP jumper configuration for PWM
Table 4-2. PWM Control Mode for DSG Devices
IN1 IN2 OUT1 OUT2 Description
LOW- turn EN/IN1 PWM pot
completely counter-clockwise
LOW- turn PH/IN2 PWM pot
completely counter-clockwise
Hi-Z Hi-Z Coast (H-bridge Hi-Z)/
Low-power automatic
sleep mode
PWM - turn EN/IN1 PWM pot in any
position
HIGH- turn PH/IN2 PWM pot
completely clockwise
L H Reverse (OUT2 -> OUT1)
PWM - turn EN/IN1 PWM pot in any
position
LOW- turn PH/IN2 PWM pot
completely counter-clockwise
H L Forward (OUT1 -> OUT2)
HIGH- turn EN/IN1 PWM pot
completely clockwise
HIGH- turn PH/IN2 PWM pot
completely clockwise
L L Brake, (Low-Side Slow
Decay)
Table 4-3. PWM Control Mode for PDSG Devices
nSLEEP IN1 IN2 OUT1 OUT2 Description
0 (connect MODE/
nSLEEP pin to GND
pin)
X X Hi-Z Hi-Z Coast (H-bridge Hi-Z)/
Low-power automatic
sleep mode
1 (connect MODE/
nSLEEP pin to 3.3V
pin)
PWM - turn EN/IN1
PWM pot in any
position
HIGH- turn PH/IN2
PWM pot completely
clockwise
L H Reverse (OUT2 ->
OUT1)
1 (connect MODE/
nSLEEP pin to 3.3V
pin)
PWM - turn EN/IN1
PWM pot in any
position
LOW- turn PH/IN2
PWM pot completely
counter-clockwise
H L Forward (OUT1 ->
OUT2)
1 (connect MODE/
nSLEEP pin to 3.3V
pin)
HIGH- turn EN/IN1
PWM pot completely
clockwise
HIGH- turn PH/IN2
PWM pot completely
clockwise
L L Brake, (Low-Side
Slow Decay)
MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers www.ti.com
8 DRV821xEVM and DRV8220EVM User's Guide SLOU540A – NOVEMBER 2020 – REVISED DECEMBER 2020
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