A8904SLP

A8904SLP Datasheet

A8904

Part	Datasheet
A8904SLP	A8904SLP (pdf)

Related Parts	Information
A8904SLP-T	A8904SLP-T
A8904SLPTR-T	A8904SLPTR-T
A8904SLB-T	A8904SLB-T
A8904SLBTR	A8904SLBTR
A8904SLBTR-T	A8904SLBTR-T
A8904SLPTR	A8904SLPTR
A8904SLB	A8904SLB

PDF Datasheet Preview
A8904 3-Phase Brushless DC Motor Controller/Driver with Back EMF Sensing 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 28-pin TSSOP with exposed thermal pad Package LP 24-pin SOICW with internally fused pins LB package 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 1.2A. TheA8904 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 BCD Bipolar CMOS 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 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. Functional Block Diagram LOGIC SUPPLY C D2 C ST BRAKE C RES OUT A OUT B CENTERTAP OUTC COMMUTATION LOGIC SEQUENCE LOGIC BRAKE FCOM COMMUTATION DELAY START-UP OSC. BLANK BOOST CHARGE PUMP C WD SECTOR DATA FREQUENCYLOCKED LOOP WATCHDOG TIMER CHARGE PUMP CURRENT CONTROL RS DATA IN SERIAL PORT LOAD SUPPLY OUT A OUT B OUTC GROUND 26301.5H CHIP CLOCK RESET DATA OUT SELECT

PDF Datasheet Preview

A8904
3-Phase Brushless DC Motor Controller/Driver with Back EMF Sensing

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
28-pin TSSOP with exposed thermal pad

Package LP
24-pin SOICW with internally fused pins

LB package

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 1.2A. TheA8904 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 BCD Bipolar CMOS 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 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.

Functional Block Diagram

LOGIC SUPPLY

C D2 C ST BRAKE

C RES

OUT A

OUT B

CENTERTAP

OUTC

COMMUTATION LOGIC

SEQUENCE LOGIC

BRAKE

FCOM COMMUTATION DELAY

START-UP OSC.

BLANK

BOOST CHARGE

PUMP

C WD SECTOR

DATA

FREQUENCYLOCKED LOOP

WATCHDOG TIMER

CHARGE PUMP

CURRENT CONTROL RS

DATA IN

SERIAL PORT

LOAD SUPPLY OUT A OUT B OUTC

GROUND
26301.5H

CHIP CLOCK RESET DATA OUT SELECT

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Datasheet ID: A8904SLP 516100