A4964 datasheet(64/92 Pages) ALLEGRO

64 / 92 page

Sensorless Sinusoidal Drive BLDC Controller

A4964

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Serial Register Reference

5: Gate drive config

TRS3 TRS2 TRS1 TRS0 TFS3 TFS2 TFS1 TFS0

6: Current limit config

OBT4 OBT3 OBT2 OBT1 OBT0 VIL3

VIL2

VIL1

VIL0

TRS[3:0] Slew Control Turn-On Time

tRS = n × 50 ns

where n is a positive integer defined by TRS[3:0],

e.g. when TRS[3:0] = [0110] then tRS = 300 ns.

The range of tRS is 0 ns to 750 ns.

TFS[3:0] Slew Control Turn-Off Time

tFS = n × 50 ns

where n is a positive integer defined by TFS[3:0],

e.g. when TFS[3:0] = [1100] then tFS = 600 ns.

The range of tFS is 0 ns to 750 ns.

OBT[4:0] Current Limit Blank Time

tOCB = (n + 2) × 200 ns

where n is a positive integer defined by OBT[4:0],

e.g. when OBT[4:0] = [1 0000] then tOCB = 3.6 µs.

The range of tOCB is 1 µs to 6.6 µs.

Setting a value of OBT = 0, 1, 2, and 3 will set the blank

time to 1 µs.

VIL[3:0]

Current Limit Scale

VILIM defined by Scale × Maximum Threshold:

VIL3

VIL2

VIL1

VIL0

Scale

Default

1/16

2/16

3/16

4/16

5/16

6/16

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A4964 Datasheet(PDF) 64 Page - Allegro MicroSystems

A4964 Datasheet(HTML) 64 Page - Allegro MicroSystems

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