A4964 datasheet(87/92 Pages) ALLEGRO

87 / 92 page

Sensorless Sinusoidal Drive BLDC Controller

A4964

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Table A1b: Fault Response Actions (ESF = 1, VLU masked)

Fault Description

Disable

Outputs

RSC [7]

Fault State

Latched

Other Action

Fault State Reset

Re-Enable Outputs

No Fault

n/a

None

n/a

System Error

Yes [1]

n/a

Yes

RUN = 0

POR, RUN = 1

Serial Error

n/a

None

POR or SPI [3]

n/a

VBB POR

Yes [1]

n/a

Internal logic

shutdown & reset

Condition removed

RUN = 1

VBB Undervoltage

Yes [1]

Yes

None

Demand input = 0 or RUN = 0

Demand input reset [5]

or RUN reset [6]

SPI [3][4]

Condition removed

Watchdog Fault

Yes [1]

Yes

MCU reset

First watchdog transition after

100 ms from MRSTn going high

Demand input reset [5],

RUN reset [6], or SPI [3][4]

Yes

First watchdog transition after 100 ms from MRSTn going high

VREG Undervoltage

Yes [1]

n/a

None

Condition removed

Bootstrap Undervoltage

Yes [1]

n/a

Yes

None

Demand input = 0 or RUN = 0

Demand input reset [5]

or RUN reset [6]

SPI [3][4]

Temperature Warning

n/a

None

Condition removed

n/a

Overtemperature

Yes [1]

n/a

Yes

VLR regulator

shutdown & MCU

reset

First watchdog transition after 100 ms from MRSTn going high

Loss of Synchronization

Yes [1]

Yes

None

Demand input = 0 or RUN = 0

Demand input reset [5]

or RUN reset [6]

SPI [3][4]

Stop and restart

Condition removed

VDS Overvoltage

Yes [1]

n/a

Yes

None

Demand input = 0 or RUN = 0

Demand input reset [5]

or RUN reset [6]

SPI [3][4]

[1]

All gate drives low, all MOSFETs off.

[2]

Gate drive for the affected MOSFET low, only the affected MOSFET off.

[3]

Only when DSR = 0.

[4]

Serial read of Status or Diagnostic register.

[5]

Set demand input = 0 then set demand input to a new operating value.

[6]

Set RUN bit = 0 then set RUN bit = 1.

[7]

Restart control bit.

A4964 Datasheet(PDF) 87 Page - Allegro MicroSystems

A4964 Datasheet(HTML) 87 Page - Allegro MicroSystems

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