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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 25/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1463-6 |
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A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
The following table summarizes the Step Angle Numbers used
for the four resolutions available when using the STEP input to
control the output of the A4979:
ment number that is added to the Step Angle Number causing it
to increase or decrease. Two’s complement is the natural integer
number system for most microcontrollers. This allows standard
Mode
Full
Half
Quarter
Sixteenth
Step Angle Numbers used
8, 24, 40, 56
0, 8, 16, 24, 32, 40, 48, 56
0, 4, 8, 12, 16, 20, 24, 28, 32,
36, 40, 44, 48, 52, 56, 60
All
arithmetic operators to be used, within the microcontroller, to
determine the size of the next step increment. Table 6 shows the
binary equivalent of each decimal number between –16 and +16.
Each increase in the Step Angle Number represents a forwards
movement of one-sixteenth microstep. Each decrease in the Step
Angle Number represents a reverse movement of one-sixteenth
microstep.
The microstep select inputs can be changed between each rising
edge of the STEP input. The only restriction is that the MSO and
MS1 logic inputs must comply with the set-up and hold timing
constraints. When the microstep resolution changes, the A4979
moves to the next available Step Angle Number on the next rising
edge of the STEP input. For example, if the microstep mode is
sixteenth and the present Step Angle Number is 59, then with the
direction forwards (increasing Step Angle Number), changing
to quarter step mode will cause the phase number to go to 60 on
the next rising edge of the STEP input. If instead the microstep
mode is changed to half step then the phase number will go to 0
on the next rising edge of the STEP input. If the microstep mode
To move the motor one full step, the Step Angle Number must be
increased or decreased by 16. To move the motor one half step,
the Step Angle Number must be increased or decreased by 8. For
quarter step the increase or decrease is 4 and for eighth step, 2.
So, for example, to continuously move the motor forwards in
quarter-step increments, the number 4 (000100) is repeatedly
written to SC[5:0] through the serial interface Run register (see
figure 10). To move the motor backwards in quarter step incre-
ments, the number -4 (111100) is repeatedly written to SC[5:0]
is changed to full step then the phase number will go to 8 on the
next rising edge of the STEP input.
Table 6. Binary Equivalents
2’s
2’s
Control Through the Serial Interface
The A4979 provides the ability to directly control the motor
movement using only the serial interface. In fact, all features
of the A4979, except sleep mode, can be controlled through the
serial interface thus removing the requirement for individual
control inputs. This can reduce the interface requirement from
multiple I/O signals to a single four wire interface.
Motor movement is controlled using the serial interface by
increasing or decreasing the Step Angle Number. Note that the
maximum value of the Step Angle Number is 63 and the mini-
mum number is 0.Therefore, any increase or decrease in the
microstep number is performed using modulo 64 arithmetic. This
means that increasing a Step Angle Number of 63 by 1 will pro-
duce a Step Angle Number of 0. Increasing by two from 63 will
produce 1 and so on. Similarly in the reverse direction, decreasing
a Step Angle Number of 0 by 1 will produce a Step Angle Num-
ber of 63. Decreasing by two from 0 will produce 62 and so on.
The least significant six bits of the Run register, bits 0 to 5, are
the step change number, SC[5:0]. This number is a two’s comple-
Decimal
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Complement
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
Decimal
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
–11
–12
–13
–14
–15
–16
Complement
111111
111110
111101
111100
111011
111010
111001
111000
110111
110110
110101
110100
110011
110010
110001
110000
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
25
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