DRV8704 Datasheet, PDF (20/38 Pages) Texas Instruments – Dual H-Bridge PWM Gate Driver

DRV8704
SLVSD29 – OCTOBER 2015
www.ti.com
7.5 Register Maps
7.5.1 Control Registers
The DRV8704 uses internal registers to control the operation of the motor. The registers are programmed by a
serial SPI communications interface. At power-up or reset, the registers will be pre-loaded with default values as
shown in Table 3.
Following is a map of the DRV8704 registers:
Table 3. DRV8704 Register Map
NAME
CTRL
TORQUE
OFF
BLANK
DECAY
RESERVED
DRIVE
STATUS
11
10
9
8
DTIME
ISGAIN
Reserved
Reserved
PWMMODE
Reserved
Reserved
DECMOD
IDRIVEP
IDRIVEN
Reserved
7
6
5
4
3
2
TDRIVEP
Reserved
TORQUE
TOFF
TBLANK
TDECAY
Reserved
TDRIVEN
OCPDEG
UVLO
BPDF
APDF
BOCP
Individual register contents are defined in the following sections.
1
0
ENBL
OCPTH
AOCP
OTS
ADDRESS
HEX
R/W
00
R/W
01
R/W
02
R/W
03
R/W
04
R/W
05
R/W
06
R/W
07
7.5.1.1 CTRL Register (Address = 0x00h)
BIT
0
7-1
9-8
11-10
NAME
ENBL
Reserved
ISGAIN
DTIME
SIZE
1
7
2
2
Table 4. CTRL Register
R/W
DEFAULT
R/W
1
—
—
R/W
11
R/W
00
DESCRIPTION
0: Disable motor
1: Enable motor
Reserved
ISENSE amplifier gain set
00: Gain of 5 V/V
01: Gain of 10 V/V
10: Gain of 20 V/V
11: Gain of 40 V/V
Dead time set
00: 410-ns dead time
01: 460-ns dead time
10: 670-ns dead time
11: 880-ns dead time
7.5.1.2 TORQUE Register (Address = 0x01h)
Table 5. TORQUE Register
BIT
7-0
11-8
NAME
TORQUE
Reserved
SIZE
8
4
R/W
DEFAULT
DESCRIPTION
R/W
0xFFh
Sets full-scale output current for both H-bridges
—
—
Reserved
7.5.1.3 OFF Register (Address = 0x02h)
Table 6. OFF Register
BIT
7-0
8
11-9
NAME
TOFF
PWMMODE
Reserved
SIZE
8
1
3
R/W
DEFAULT
DESCRIPTION
R/W
0x30h
Sets fixed off time, in increments of 525 ns
0x00h: 525 ns
0xFFh: 133.8 µs
R/W
1
0: Do not write ‘0’ to this register
1: PWM control mode
—
—
Reserved
20
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