a8904 Allegro MicroSystems, Inc., a8904 Datasheet

a8904

Manufacturer Part Number

a8904

Description

3-phase Brushless Dc Motor Controller/driver With Back Emf Sensing

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A8904.pdf (18 pages)

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Features and Benefits

▪ Pin-for-pin replacement for A8902CLBA

▪ Start-up commutation circuitry

▪ Sensorless commutation circuitry

▪ Option of external sector data tachometer signal

▪ Option of external speed control

▪ Oscillator operation up to 20 MHz

▪ Programmable overcurrent limit

▪ Transconductance gain options: 500 mA/V or 250 mA/V

▪ Programmable watchdog timer

▪ Directional control

▪ Serial port interface

▪ TTL-compatible inputs

▪ System diagnostics data-out ported in real time

▪ Dynamic braking through serial port or external terminal

Packages:

Not to scale

26301.5G

with exposed thermal pad

28-pin TSSOP

(Package LP)

CENTERTAP

DATA IN

SECTOR

C WD

DATA

OSC

OUT A

OUT B

OUT C

with internally fused pins

3-Phase Brushless DC Motor Controller/Driver

SELECT

CHIP

24-pin SOICW

LOCKED LOOP

(LB package)

FREQUENCY-

SERIAL PORT

CLOCK RESET

Functional Block Diagram

SUPPLY

LOGIC

V DD

FCOM

BLANK

DATA OUT

MUX

COMMUTATION

C D1

WATCHDOG

CHARGE

DELAY

PUMP

TIMER

Description

The A8904 is a 3-phase brushless DC motor controller/driver

designed for applications where accurate control of high-speed

motors is required. The three half-bridge outputs are low

on-resistance, N-channel DMOS devices capable of driving up

to 1.2 A. The A8904 provides complete, reliable, self-contained

back EMF sensing, motor start-up, and running algorithms. A

programmable digital frequency-locked loop speed control

circuit together with the linear current control circuitry provides

precise motor speed regulation.

A serial port allows the user to program various features and

modes of operation, such as the speed control parameters,

start-up current limit, sleep mode, direction, and diagnostic

modes.

The A8904 is fabricated in the Allegro

DMOS) process, an advanced mixed-signal technology that

combines bipolar, analog, and digital CMOS, with DMOS

power devices.

The device is provided in a 24-pin wide-body SOIC package,

with 4 internally-fused leads for enhanced thermal dissipation

(package LB), and a thin (<1.2 mm overall height), 28-pin

TSSOP package with an exposed thermal pad Package LP).

Both packages are lead (Pb) free, with 100% matte tin leadframe

plating.

C D2

TSD

START-UP

OSC.

C ST

FILTER

BRAKE

with Back EMF Sensing

CURRENT

CONTROL

CHARGE

C RES

BOOST

PUMP

V BB

R S

GROUND

LOAD

SUPPLY

OUT B

OUT C

GROUND

OUT A

BCD (Bipolar CMOS

A8904

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