DRV8835_15 Datasheet, PDF (7/19 Pages) Texas Instruments – DUAL LOW VOLTAGE H-BRIDGE IC

DRV8835
www.ti.com
SLVSB18D – MARCH 2012 – REVISED JANUARY 2014
FUNCTIONAL DESCRIPTION
Bridge Control
Two control modes are available in the DRV8835: IN/IN mode, and PHASE/ENABLE mode. IN/IN mode is
selected if the MODE pin is driven low or left unconnected; PHASE/ENABLE mode is selected if the MODE pin is
driven to logic high. The following tables show the logic for these modes.
MODE
0
0
0
0
xIN1
0
0
1
1
Table 2. IN/IN MODE
xIN2
0
1
0
1
xOUT1
Z
L
H
L
xOUT2
Z
H
L
L
FUNCTION
(DC MOTOR)
Coast
Reverse
Forward
Brake
MODE
1
1
1
Table 3. PHASE/ENABLE MODE
xENABLE
0
1
1
xPHASE
X
1
0
xOUT1
L
L
H
xOUT2
L
H
L
FUNCTION
(DC MOTOR)
Brake
Reverse
Forward
Sleep Mode
If the VCC pin is brought to 0 volts, the DRV8835 will enter a low-power sleep mode. In this state all
unnecessary internal circuitry is powered down. For minimum supply current, all inputs should be low (0 V)
during sleep mode.
Power Supplies and Input Pins
There is a weak pulldown resistor (approximately 100 kΩ) to ground on the input pins.
VCC and VM may be applied and removed in any order. When VCC is removed, the device will enter a low
power state and draw very little current from VM. The input pins should be kept at 0 V during sleep mode to
minimize current draw.
The VM voltage supply does not have any undervoltage lockout protection (UVLO), so as long as VCC > 1.8 V,
the internal device logic will remain active. This means that the VM pin voltage may drop to 0 V, however, the
load may not be sufficiently driven at low VM voltages.
Protection Circuits
The DRV8835 is fully protected against undervoltage, overcurrent and overtemperature events.
Overcurrent Protection (OCP)
An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled. After
approximately 1 ms, the bridge will be re-enabled automatically.
Overcurrent conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor
winding will all result in an overcurrent shutdown.
Thermal Shutdown (TSD)
If the die temperature exceeds safe limits, all FETs in the H-bridge will be disabled . Once the die temperature
has fallen to a safe level operation will automatically resume.
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