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DRV8889-Q1 Datasheet(PDF) 42 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) 42 Page - Texas Instruments

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Figure 7-26. Three DRV8889-Q1 Devices Connected in Daisy Chain
Figure 7-27. Three DRV8889A-Q1 Devices Connected in Daisy Chain
The first device in the chain receives data from the MCU in the following format for 3-device configuration: 2
bytes of header (HDRx) followed by 3 bytes of address (Ax) followed by 3 bytes of data (Dx).
HDR1
HDR2
A3
A2
A1
D3
D2
D1
SDI1
nSCS
S3
S2
S1
HDR1
HDR2
R3
R2
R1
SDO3
S1
HDR1
HDR2
A3
A2
R1
D3
D2
SDO1 / SDI2
S2
S1
HDR1
HDR2
A3
R2
R1
D3
SDO2 / SDI3
All Address bytes
reach destination
All Data bytes
reach destination
Reads executed here
Writes executed here
Status response here
Figure 7-28. SPI Frame With Three Devices
After the data has been transmitted through the chain, the MCU receives the data string in the following format
for 3-device configuration: 3 bytes of status (Sx) followed by 2 bytes of header followed by 3 bytes of report (Rx).
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
42
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Product Folder Links: DRV8889-Q1


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