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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/44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
When using the serial interface to control the stepper motor, a
step change value (6-bit) is input through the serial interface to
increase or decrease the Step Angle Number. The step change
value is a two’s complement (2’sC) number, where a positive
value increases the step angle and a negative value decreases
the step angle. A single step change in the Step Angle Number is
equivalent to a single one-sixteenth microstep. Therefore, for cor-
rect motor movement, the step change value should be restricted
to no greater than 16 steps, positive or negative.
This facility enables full control of the stepper motor at any
microstep resolution up to and including sixteenth-step, plus
the ability to change microstep resolution “on-the-fly” from one
microstep to the next.
In both control input method cases, the resulting Step Angle
Number is used to determine the phase current value and current
direction for each phase, based on the Phase Current table. The
decay mode is determined by the position in the Phase Current
table and the intended direction of rotation of the motor.
Diagnostics
The A4979 integrates a number of diagnostic features to protect
the driver and load as far as possible from fault conditions and
extreme operating environments. At the system level the supply
voltages and the chip temperature are monitored. A number of
these features automatically disable the current drive to protect
the outputs and the load. Others only provide an indication of
the likely fault status, as shown in the Fault table (table 1). A
single diagnostic output pin (DIAG) can be programmed through
Table 1. Fault Table
the serial interface to provide several different internal signals.
At power-up, or after a power-on-reset the DIAG pin outputs a
simple Fault Output flag which will be low if a fault is present.
The Fault Output flag remains low while the fault is present or if
one of the latched faults (for example, a bridge short circuit) has
been detected and the outputs disabled.
Alternative to the Fault Output flag, the DIAG output can be pro-
grammed via the serial interface to output: the stall detect signal,
which goes low when a stall is detected; the phase A PWM-on
signal, which is high during the phase A PWM on-time; or an
analog signal indicating the silicon temperature.
If required, specific fault information can be determined by read-
ing the diagnostic registers (see Serial Interface section).
The first bit (bit 15) in both diagnostic registers contains a com-
mon Fault Register flag which will be high if any of the fault bits
in either register has been set. This allows a fault condition to be
detected using the serial interface, by simply taking STRn low.
As soon as STRn goes low the fist bit in the diagnostic registers
can be read to determine if a fault has been detected at any time
since the last diagnostic registers reset. In all cases the fault bits
in the diagnostic registers are latched and only cleared after a
diagnostic registers reset.
Note that the Fault Register flag in the diagnostic registers, does
not provide the same function as the Fault Output flag on the
DIAG pin. The Fault Output flag on the DIAG pin provides an
indication that either a fault is present or the outputs have been
disabled due to a short circuit fault. The Fault Register flag sim-
ply provides an indication that a fault has occurred since the last
diagnostic registers reset and has been latched.
At the system level the supply voltages and chip temperature are
Diagnostic
VREG Undervoltage
VDD Undervoltage
Temperature Warning
Overtemperature
Bridge Short
Bridge Open
Stall Detect
Action
Disable outputs, set
Fault Register flag
Power-down,
full reset
Set Fault Register flag
Disable outputs, set
Fault Register flag
Disable outputs, set
Fault Register flag
Set Fault Register flag
Set ST flag
Latched
No
No
No
No
Yes
No
No
monitored.
Supply Voltage Monitors
The logic supply, the motor supply, and the regulator output are
monitored: the motor supply, and the regulator output and logic
supply for undervoltage.
? If the motor supply voltage, V BBA and V BBB , goes below the
VBB undervoltage threshold, the A4979 will indicate the fault
and reduce the VREG undervoltage threshold to the low level.
When the motor supply voltage goes above the VBB under-
voltage threshold, the VREG undervoltage threshold will be
increased to the high level and the fault flag removed. The fault
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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相关代理商/技术参数 |
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| A4980 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4980KLP-T | 制造商:Allegro MicroSystems LLC 功能描述: |
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| A4982_V4 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
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