A4979 datasheet(6/44 Pages) ALLEGRO

6 / 44 page

ELECTRICAL CHARACTERISTICS1,2 (continued) Valid at TA = 25°C, VBB = 50 V, VDD = 3.3 V; unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Current Control (continued)

Reference Input Current

IREF

–3

μA

Maximum Sense Voltage

VSMAX

–

125

–

Current Trip Point Error4

EITrip

VREF = 2 V, MxI0 = MxI1 = 1

–

±5

Logic Input And Output – DC Parameters

Input Low Voltage

VIL

–

0.3 × VDD

Input High Voltage

VIH

0.7 × VDD

––

Input Hysteresis

VIhys

250

500

–

Input Current (Except RESETn)

IIN

0 V < VIN < VDD

–1

–

μA

Input Pull-Down Resistor (RESETn)

RPD

–50–

kΩ

Output Low Voltage

VOL

IOL = 2 mA

–

0.2

0.4

Output High Voltage

VOH

IOL = –2 mA

VDD–0.4

VDD–0.2

–

Output Leakage (SDO)

0 V < VO < VDD, STRn = 1

–1

–

μA

Logic Input And Output – Dynamic Parameters

Reset Pulse Width

tRST

0.2

–

4.5

μs

Reset Shutdown Width

tRSD

–

μs

Input Pulse Filter Time (STEP, DIR)

tPIN

–35–

Clock High Time

tSCKH

A in figure 1

–

Clock Low Time

tSCKL

B in figure 1

–

Strobe Lead Time

tSTLD

C in figure 1

–

Strobe Lag Time

tSTLG

D in figure 1

–

Strobe High Time

tSTRH

E in figure 1

300

–

Data Out Enable Time

tSDOE

F in figure 1

–

Data Out Disable Time

tSDOD

G in figure 1

–

Data Out Valid Time from Clock Falling

tSDOV

H in figure 1

–

Data Out Hold Time from Clock Falling

tSDOH

I in figure 1

–

Data In Set-Up Time to Clock Rising

tSDIS

J in figure 1

–

Data In Hold Time From Clock Rising

tSDIH

K in figure 1

–

STEP Rising to STRn Rising

Setup Time

tSPS

L in figure 1, only when D15 = 1 and D14 = 0

100

–

STEP Rising from STRn Rising

Hold Time

tSPH

M in figure 1, only when D15 = 1 and D14 = 0

300

–

Step High Time

tSTPL

1––

μs

Step Low Time

tSTPH

1––

μs

Microstepping Programmable Stepper Motor Driver

With Stall Detect and Short Circuit Protection

A4979

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Continued on the next page…

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