A4989SLDTR-T Allegro Microsystems Inc, A4989SLDTR-T Datasheet - Page 6

• Manufacturer Part Number: A4989SLDTR-T
• Description: DUAL FULL BRDG MOSFET DRVR W/MICROSTEP TRANS
• Manufacturer: Allegro Microsystems Inc

Specifications of A4989SLDTR-T

• Applications: Stepper Motor Controller, 2-Phase
• Number Of Outputs: 1
• Voltage - Load: 12 V ~ 50 V
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TFSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1389-2

A4989
Table 1. Microstep Resolution Truth Table
Table 2. Mixed Decay Selection Truth Table
Full Step
(MS2 = 0, MS1 = 0)
Half Step
(MS2 = 0, MS1 = 1)
1/4 Step
(MS2 = 1, MS1 = 0)
1/16 Step
(MS2 = 1, MS1 = 1)
MS2
0
0
1
1
Microstep
Setting
MS1
0
1
0
1
Microstep Resolution
Magnitude
of Current
Sixteenth Step
Falling
Falling
Falling
Falling
Rising
Rising
Rising
Rising
Quarter Step
Half Step
Full Step
MSx, DIR
Figure 1. Logic Interface Timing Diagram
RESET
STEP
PFD2 = 0, PFD1 = 0 PFD2 = 0, PFD1 = 1
t
Slow
Slow
Slow
Slow
Slow
Slow
Slow
Slow
WAKE
t
SU
t
H
Steps 1 to 5: 11%
Dual Full-Bridge MOSFET Driver
Step 1: 11%
t
STEPH
Slow
Slow
Slow
11%
11%
11%
with Microstepping Translator
PFDx State
PFD2 = 1, PFD1 = 0
Steps 1 to 5: 11%
t
Step 1: 11%
STEPL
Slow
Slow
Slow
26%
26%
26%
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
PFD2 = 1, PFD1 = 1
Steps 1 to 5: 11%
Step 1: 11%
Slow
Slow
Slow
Fast
Fast
Fast
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