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DRV8889-Q1 Datasheet(PDF) 30 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) 30 Page - Texas Instruments

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7.3.7 Blanking Time
After the current is enabled in an H-bridge, the current sense comparator is ignored for a period of time (tBLANK)
before enabling the current-sense circuitry. The blanking time also sets the minimum drive time of the PWM.
When the device goes into a drive phase at the end of a slow-decay phase, or goes into a slow-decay phase at
the end of a drive phase, the blanking time is as shown in Table 7-8.
Table 7-8. Slow-decay to Drive Blanking Time
DEVICE
EN_SR_BLANK
SLEW_RATE
Blanking Time
(tBLANK)
DRV8889A-Q1
0
All
500 ns
1
00b
5.6 µs
01b
2 µs
10b
1.5 µs
11b
860 ns
DRV8889-Q1
Not Applicable
All
500 ns
Additional blanking time is beneficial in case the stepper motor has excessive parasitic coil capacitance. For the
DRV8889A-Q1, when operating the device with slow-slow or either smart tune decay modes, it is recommended
to set the EN_SR_BLANK bit to '1'.
If the device goes into drive phase at the end of a fast-decay phase, the blanking time is shown in Table 7-9.
Table 7-9. Fast-decay to Drive Blanking Time
SLEW_RATE
Blanking Time (tBLANK)
00b
5.6 µs
01b
2 µs
10b
1.5 µs
11b
860 ns
7.3.8 Charge Pump
A charge pump is integrated to supply a high-side N-channel MOSFET gate-drive voltage. The charge pump
requires a capacitor between the VM and VCP pins to act as the storage capacitor. Additionally a ceramic
capacitor is required between the CPH and CPL pins to act as the flying capacitor.
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
30
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