DRV8809 Datasheet, PDF (28/44 Pages) Texas Instruments – COMBINATION MOTOR DRIVERS WITH DC-DC CONVERTERS

DRV8809
DRV8810
SLVS854A – JULY 2008 – REVISED JULY 2008 ............................................................................................................................................................... www.ti.com
VM
Charge
pump
OSCM_mon
OSCM
( 800kHz )
OSCi
( 6.4MHz )
Enable_x
Phase_x
VM
supervisor
(15v)
Control logic
& Pre-driver
Current
Sens
Current
limit
turn on/off
over
current
detect
Protect
disable
Rssx
VM
Rsens
OUTx
DC
Motor
OUTx/
MGND
Protection
control &
nORT assertion
Figure 20. DC Motor Drive
The motor configuration setup bits in the setup register can select three types of DC motor driving: utilizing a
single H-bridge, utilizing two (A and B, or C and D) H-bridges in parallel, or utilizing four H-bridges in parallel.
For the setup register value (bit 2,1,0) = (1,0,1), the device configuration is 4× DC motor, which enables each
H-bridge to drive a DC motor independently. The ENABLEx and PHASEx input terminals are reassigned from the
serial interface pins and some reserved pins, after nSLEEP pin is set to H.
For the setup register value (bit 2,1,0) = (0,1,1), the device configuration is 1× large DC + 2× DC motor mode.
The large DC driving utilizes two H-bridges in parallel and controlled by ENABLE_AB and PHASE_AB pins. Two
Rsens pins should be connected together.
The VREF inputs are used for the Rsense comparator reference voltage. VREF_AB provides the voltage to both
H-bridge A and B, and VREF_CD provides the voltage for H-bridge C and D.
FAULT
CONDITION
0
0
0
0
Motor OCP
TSD
nSLEEP
0
1
1
1
1
X
Table 14. DC Motor Drive Truth Table
ENABLEX
X
0
1
1
X
X
PHASEX
X
X
0
1
X
X
+ HIGH SIDE
OFF
OFF
OFF
ON
OFF
OFF
+ LOW SIDE
OFF
OFF
ON
OFF
OFF
OFF
- HIGH SIDE
OFF
OFF
ON
OFF
OFF
OFF
- LOW SIDE
OFF
OFF
OFF
ON
OFF
OFF
28
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