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PDF 8905 Data sheet ( Hoja de datos )

Número de pieza 8905
Descripción 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
Fabricantes Allegro MicroSystems 
Logotipo Allegro MicroSystems Logotipo



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No Preview Available ! 8905 Hoja de datos, Descripción, Manual

8905
3-PHASE BRUSHLESS DC
8905MOTOR CONTROLLER/DRIVER
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
The A8905CLB isw a three-phase brushless dc motor controller/
driver for use with CD-ROM or DVD drives. The three half-bridge
LOAD
SUPPLY
1
V BB
COMMUTATION
DELAY
24 C D1
outputs are low on-resistance n-channel DMOS devices capable of
driving up to 1.25 A. The A8905CLB provides complete, reliable,
C D2 2
23 DATA IN
self-contained back-EMF sensing motor startup and running algorithms.
C WD 3
22 CLOCK
A programmable digital frequency-locked loop speed control circuit
together with the linear current control circuitry provides precise motor
CST 4
OUTA 5
GROUND 6
TGROUND 7
COUTB 8
UOUTC 99
D YCENTERTAP 10
LBRAKE 11
O NCRES 12
21 CHIP SELECT
20 RESET
19 GROUND
18 GROUND
MUX
17 DATA OUT
BOOST
CHARGE
PUMP
FLL 16 OSCILLATOR
VDD 15
LOGIC
SUPPLY
14 INDEX
13 FILTER
R ODwg. PP-040-1
P EABSOLUTE MAXIMUM RATINGS
at TA = +25°C
D CLoad Supply Voltage, VBB . . . . . . 14 V
E NOutput Current, IOUT . . . . . . . . ±1.25 A
Logic Supply Voltage, VDD . . . . 6.0 V
U ELogic Input Voltage Range,
INVIN . . . . . . . -0.3 V to VDD + 0.3 V
RPackage Power Dissipation,
T EPD . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
N FTA . . . . . . . . . . . . . . 0°C to +70°C
O EJunction Temperature, TJ . . . +150°C†
Storage Temperature Range,
C RTS . . . . . . . . . . . . -55°C to +150°C
† Fault conditions that produce excessive
junction temperature will activate device thermal
IS Rshutdown circuitry. These conditions can be
tolerated, but should be avoided.
D OOutput current rating may be restricted to a value
Fdetermined by system concerns and factors.
speed regulation.
A serial port allows the user to program various features and modes
of operation, such as the speed control parameters, startup current limit,
sleep mode, diagnostic modes, and others.
APPLICATIONS
s CD-ROMs
s DVDs
FEATURES
s DMOS Outputs
s Low rDS(on)
s Startup Commutation Circuitry
s Back-EMF Commutation Circuitry
s Serial Port Interface
s Frequency-Locked Loop Speed Control
s Tachometer Signal Input
s Programmable Start-Up Current
s Diagnostics Mode
s Sleep Mode
s Linear Current Control
s Internal Current Sensing
s Dynamic Braking Through Serial Port
s Power-Down Dynamic Braking
s System Diagnostics Data Out
s Data Out Ported in Real Time
s Internal Thermal Shutdown Circuitry
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
and/or forced cooling. For reliable operation, the
specified maximum junction temperature should
not be exceeded.
Always order by complete part number, e.g., A8905CLB .

1 page




8905 pdf
8905
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
Term.
1
2
3
4
5
6-7
8
9
10
11
Terminal Name
LOAD SUPPLY
CD2
CWD
CST
OUTA
GROUND
OUTB
OUTC
CENTERTAP
BRAKE
12
13
14
15
16
17
18-19
20
21
22
23
24
CRES
FILTER
INDEX
LOGIC SUPPLY
OSCILLATOR
DATA OUT
GROUND
RESET
CHIP SELECT
CLOCK
DATA IN
CD1
TERMINAL FUNCTIONS
Function
VBB; the 5 V or 12 V motor supply.
One of two capacitors used to generate the ideal commutation points from the back-EMF
zero-crossing points.
Timing capacitor used by the watchdog circuit to disable the back-EMF comparators
during commutation transients, and to detect incorrect motor position.
Startup oscillator timing capacitor.
Power amplifier output A to motor.
Power and logic ground and thermal heat sink.
Power amplifier output B to motor.
Power amplifier output C to motor.
Motor centertap connection for back-EMF detection circuitry.
Active low turns ON all three sink drivers shorting the motor windings to ground. External
capacitor and resistor at BRAKE provide brake delay. The brake function can also be
controlled via the serial port.
External reservoir capacitor used to hold charge to drive the source drivers’ gates. Also
provides power for brake circuit.
Analog voltage input to control motor current. Also, compensation node for internal speed
control loop.
External tachometer input.
VDD; the 5 V logic supply.
Clock input for the speed reference counter. Typical max. frequency is 10 MHz.
Thermal shutdown indicator, FCOM, TACH, or SYNC signals available in real time,
controlled by 2-bit multiplexer in serial port.
Power and logic ground and thermal heat sink.
When pulled low forces the chip into sleep mode; clears all serial port bits.
Strobe input (active low) for data word.
Clock input for serial port.
Sequential data input for the serial port.
One of two capacitors used to generate the ideal commutation points from the back-EMF
zero-crossing points.

5 Page





8905 arduino
8905
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
Dimensions in Inches
(for reference only)
24 13
0.0125
0.0091
0.2992
0.2914
0.020 1
0.013
2
3 0.6141
0.5985
0.491
0.394
0.050
0.016
0.050
BSC
NOTE 1
NOTE 3
0° TO 8°
0.0926
0.1043
0.0040 MIN.
Dimensions in Millimeters
(controlling dimensions)
Dwg. MA-008-25 in
24 13
0.32
0.23
7.60
7.40
0.51
0.33
1
2
3 15.60
15.20
10.65
10.00
1.27
0.40
1.27
BSC
NOTE 1
NOTE 3
0° TO 8°
2.65
2.35
0.10 MIN.
Dwg. MA-008-25A mm
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendor’s option within limits shown.

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