8906 데이터 시트보기 (PDF) - Allegro MicroSystems
부품명
상세내역
일치하는 목록
8906
Allegro MicroSystems
8906 Datasheet PDF : 12 Pages
| |||
8906
BIDIRECTIONAL
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
Serial Port. The serial port functions to write various operational
and diagnostic modes to the A8906CLB. The serial port DATA IN is
enabled/disabled by the CHIP SELECT terminal. When CHIP SE-
LECT is high the serial port is disabled and the chip is not affected by
changes in data at the DATA IN or CLOCK terminals.
To write data to the serial port, the CLOCK terminal should be low
prior to the CHIP SELECT terminal going low. Once CHIP SELECT
goes low, information on the DATA IN terminal is read into the shift
register on the positive-going transition of the CLOCK. There are 24
bits in the serial input port.
Data written into the serial port is latched and becomes active
upon the low-to-high transition of the CHIP SELECT terminal at the
end of the write cycle. D0 will be the last bit written to the serial port.
SERIAL PORT BIT DEFINITIONS
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 power outputs are commutated by the start-
up oscillator. This mode is intended for device and system
testing.
D2- Direction; LOW = Forward, HIGH = Reverse.
D3 and D4 - These two bits set the output current limit:
D3 D4 Current Limit
0
0
0
1
1
0
1
1
1.2 A
1A
600 mA
250 mA
D5 thru D18-This 14-bit word (active low) programs the REF time to set
desired motor speed.
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 switch;
LOW = internal once-around speed signal,
HIGH = external sector data.
D20 and D21-These bits program the number
of motor poles for the once-around FCOM
counter:
D20 D21
0
0
0
1
1
0
1
1
Motor Poles
8
4
16
12
D22 and D23-Controls the multiplexer for
DATA OUT:
D22 D23
DATA OUT
0
0 TACH (once around or sector)
0
1
Thermal Shutdown
1
0
SYNC
1
1
FCOM
Reset. The RESET terminal when pulled
low clears all serial port bits, including the D0
latch, which puts the A8906CLB in the sleep
mode.
Share Link: