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DRV8889-Q1 Datasheet(PDF) 16 Page - Texas Instruments

Part No. DRV8889-Q1
Description  DRV8889-Q1, DRV8889A-Q1 Automotive Stepper Driver with Integrated Current Sense, 1/256 Micro-Stepping, and Stall Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DRV8889-Q1 Datasheet(HTML) 16 Page - Texas Instruments

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7.3.2 PWM Motor Drivers
The device has drivers for two full H-bridges to drive the two windings of a bipolar stepper motor. Figure 7-2
shows a block diagram of the circuitry.
Gate
Drivers
VM
Current
Sense
VM
Current
Sense
xOUT1
xOUT2
PGND
Microstepping and
Current Regulation
Logic
Figure 7-2. PWM Motor Driver Block Diagram
7.3.3 Microstepping Indexer
Built-in indexer logic in the device allows a number of different step modes. The MICROSTEP_MODE bits in the
SPI register are used to configure the step mode as shown in Table 7-2.
Table 7-2. Microstepping Settings
MICROSTEP_MODE
STEP MODE
0000b
Full step (2-phase excitation) with 100%
current
0001b
Full step (2-phase excitation) with 71%
current
0010b
Non-circular 1/2 step
0011b
1/2 step
0100b
1/4 step
0101b
1/8 step
0110b
1/16 step
0111b
1/32 step
1000b
1/64 step
1001b
1/128 step
1010b
1/256 step
Table 7-3 shows the relative current and step directions for full-step (71% current), 1/2 step, 1/4 step and 1/8
step operation. Higher microstepping resolutions follow the same pattern. The AOUT current is the sine of the
electrical angle and the BOUT current is the cosine of the electrical angle. Positive current is defined as current
flowing from the xOUT1 pin to the xOUT2 pin while driving.
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
16
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Copyright © 2020 Texas Instruments Incorporated
Product Folder Links: DRV8889-Q1


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