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参数资料
| 型号： | 8904 |
| 厂商： | Allegro MicroSystems, Inc. |
| 英文描述： | 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING |
| 中文描述： | 3相无刷直流电动机控制器/驱动器，反电动势遥感 |
| 文件页数： | 13/18页 |
| 文件大小： | 744K |
| 代理商： | 8904 |
8904
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
www.allegromicro.com
13
the write cycle, the CHIP SELECT goes high, the serial port is
disabled and no more data can be transferred. In addition, the
data written to the serial port is latched and becomes active.
If a word of less than 29 bits is sent, the unused most
significant bits that are not programmed, are reset to zero. There
are no compatibility issues when using the A8904 in an existing
A8902-A application as the five MSBs are reset to zero, which
is the default condition for A8902-A operation. The only
consideration when using the A8904 in an A8902-A application
is to ensure the minimum CHIP SELECT high time is at least
500 ns.
D0 - Sleep/Run Mode; LOW = Sleep, HIGH = Run. This
bit allows the device to be powered down when not in use.
D1 - Step Mode; LOW = Normal Operation, HIGH = Step
Only. When in the step-only mode the back-EMF commutation
circuitry is disabled and the start-up oscillator commutates the
power outputs. This mode is intended for device and system
testing.
D2 - Brake; LOW = Run, HIGH = Brake.
D3, D4, and D28 - The output current limit is set by D3 &
D4; D28 sets the transconductance gain.
Current limit
(typical)
1.2 A
1.0 A
600 mA
250 mA
600 mA
500 mA
300 mA
125 mA
Transconductance
gain
500 mA/V
500 mA/V
500 mA/V
500 mA/V
250 mA/V
250 mA/V
250 mA/V
250 mA/V
D3
0
0
1
1
0
0
1
1
D5 to D18 - 14-bit word, active low. Programs the count
number to produce the corresponding REF signal, which
indicates the desired motor speed.
D4
0
1
0
1
0
1
0
1
D28
0
0
0
0
1
1
1
1
Bit number
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
Count number
16
32
64
128
256
512
1,024
2,048
4,096
8,192
16,384
32,768
65,536
131,072
D19 - Speed control mode; LOW = internal, once-around
speed signal, HIGH = external sector data.
D20 and D21 - Programs the number of motor poles for the
once-around FCOM counter.
D20
0
0
1
1
D21
0
1
0
1
Motor poles
8
4
16
12
D22 and D23 - Controls the multiplexer for DATA OUT.
See DATA OUT Section for status definitions.
D22
0
0
1
1
D24 - Speed Reference. LOW = Internal, using back-EMF
technique, HIGH = External (internal control disabled).
D25 - Direction. LOW = Forward, HIGH = Reverse.
D26 and D27 - Programs the charging current for the
watchdog capacitor. This function is used for adjusting the
blanking duration and also the watchdog commutation period.
D23
0
1
0
1
DATA OUT
TACH (once around or sector) signal
Thermal shutdown
SYNC signal
FCOM signal
D26
0
0
1
1
D27
0
1
0
1
Watchdog charge current (typical)
-10 μA
-20 μA
-30 μA
-40 μA
Functional Description (cont’d)
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