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DRV8889-Q1 Datasheet(PDF) 15 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) 15 Page - Texas Instruments

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7.3 Feature Description
Table 7-1 lists the recommended external components for the DRV8889-Q1 and DRV8889A-Q1 devices.
Table 7-1. External Components
COMPONENT
PIN 1
PIN 2
RECOMMENDED
CVM1
VM
GND
Two X7R, 0.01-µF, VM-rated ceramic capacitors
CVM2
VM
GND
Bulk, VM-rated capacitor
CVCP
VCP
VM
X7R, 0.22-µF, 16-V ceramic capacitor
CSW
CPH
CPL
X7R, 0.022-µF, VM-rated ceramic capacitor
CDVDD
DVDD
GND
X7R, 0.47-µF to 1-µF, 6.3-V ceramic capacitor
RnFAULT
VCC (1)
nFAULT
>4.7-kΩ resistor
RREF1
VREF
VCC
Resistor to limit chopping current. It is recommended that the value of parallel
combination of RREF1 and RREF2 should be less than 50-kΩ.
RREF2 (Optional)
VREF
GND
(1)
VCC is not a pin on the device, but a VCC supply voltage pullup is required for open-drain output nFAULT; nFAULT may be pulled up to
DVDD
7.3.1 Stepper Motor Driver Current Ratings
Stepper motor drivers can be classified using three different numbers to describe the output current: peak, rms,
and full-scale.
7.3.1.1 Peak Current Rating
The peak current in a stepper driver is limited by the overcurrent protection trip threshold IOCP. The peak current
describes any transient duration current pulse, for example when charging capacitance, when the overall duty
cycle is very low. In general the minimum value of IOCP specifies the peak current rating of the stepper motor
driver.
The peak current rating of the device is 2.4 A per bridge.
7.3.1.2 rms Current Rating
The rms (average) current is determined by the thermal considerations of the IC. The rms current is calculated
based on the RDS(ON), rise and fall time, PWM frequency, device quiescent current, and package thermal
performance in a typical system at 25°C. The actual operating rms current may be higher or lower depending on
heatsinking and ambient temperature.
The rms current rating of the device is 1.1 A per bridge.
7.3.1.3 Full-Scale Current Rating
The full-scale current describes the top of the sinusoid current waveform while microstepping. Because the
sinusoid amplitude is related to the rms current, the full-scale current is also determined by the thermal
considerations of the device. The full-scale current rating is approximately √2 × IRMS.
The full-scale current rating of the device is 1.5 A per bridge.
AOUT
Step Input
BOUT
Full-scale current
RMS current
Figure 7-1. Full-Scale and RMS Current
www.ti.com
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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