Texas Instruments DRV821 EVM Series, Руководство пользователя, Страница: 7 / 16

4.1 PH/EN Control Mode (MODE=Logic High)
When the MODE /nSLEEP pin is logic high on power up, the device latches into PH/EN mode ( Figure 4-2 ).
PH/EN control mode is only supported by the DRV821xDSG devices. PH/EN mode allows for the H-bridge to be
controlled with a speed and direction type of interface. The truth table for PH/EN mode is shown in (
Table 4-1 ).
This method is best for bidirectional driving for one motor.
Figure 4-2. MODE /nSLEEP jumper configuration for PH/EN
Table 4-1. PH/EN Control Mode
EN PH OUT1 OUT2 Description
LOW - turn IN1 PWM Pot
completely counter-
clockwise
X L L Brake, (Low-Side Slow
Decay)
PWM - set IN1 PWM pot
in any position
LOW - turn IN2 PWM pot
completely
counterclockwise
L H Reverse (OUT2 -> OUT1)
PWM - set IN1 PWM pot
in any position
HIGH - turn IN2 PWM pot
completely clockwise
H L Forward (OUT1 -> OUT2)
www.ti.com MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers
SLOU540A – NOVEMBER 2020 – REVISED DECEMBER 2020
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DRV821xEVM and DRV8220EVM User's Guide 7
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