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PDF AMIS-30512 Data sheet ( Hoja de datos )
| Número de pieza | AMIS-30512 | |
| Descripción | Micro-Stepping Motor Driver | |
| Fabricantes | ON Semiconductor | |
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AMIS-30512
Micro-Stepping Motor Driver
Introduction
The AMIS−30512 is a micro−stepping stepper motor driver for
bipolar stepper motors. The chip is connected through I/O pins and a
SPI interface with an external microcontroller. It has an on−chip
voltage regulator, reset−output and watchdog reset, able to supply
peripheral devices. The AMIS−30512 contains a current−translation
table and takes the next micro−step depending on the clock signal on
the “NXT” input pin and the status of the “DIR” (=direction) register
or input pin. The chip provides a so−called “speed and load angle”
output. This allows the creation of stall detection algorithms and
control loops based on load−angle to adjust torque and speed. It is
using a proprietary PWM algorithm for reliable current control.
The AMIS−30512 is implemented in I2T100 technology, enabling
both high−voltage analog circuitry and digital functionality on the
same chip. The chip is fully compatible with the automotive voltage
requirements.
The AMIS−30512 is ideally suited for general−purpose stepper
motor applications in the automotive, industrial, medical, and marine
environment.
Key Features
• Dual H−Bridge for 2−phase Stepper Motors
• Programmable Peak−current up to 800 mA Using a 5−bit Current
DAC
• On−chip Current Translator
• SPI Interface
• Speed and Load Angle Output
• Seven Step Modes from Full−step up to 32 Micro−steps
www.Dat•aSFheuellt4yUI.nctoemgrated Current−sense
• PWM Current Control with Automatic Selection of Fast and Slow
Decay
• Low EMC PWM with Selectable Voltage Slopes
• Active Fly−back Diodes
• Full Output Protection and Diagnosis
• Thermal Warning and Shutdown
• Compatible with 3.3 V Microcontrollers, 5 V Tolerant Inputs
• Integrated 5 V Regulator to Supply External Microcontroller
• Integrated Reset Function to Reset External Microcontroller
• Integrated Watchdog Function
http://onsemi.com
PIN ASSIGNMENT
DO
VDD
GND
DI
CLK
NXT
DIR
ERR
SLA
CPN
CPP
VCP
(Top View)
TSTO
POR/WD
VBB
MOTXP
GND
MOTXN
MOTYN
GND
MOTYP
VBB
CS
CLR
ORDERING INFORMATION
Device
AMIS30512
Package
SOIC 24
Shipping
Tape & Reel
© Semiconductor Components Industries, LLC, 2008
September, 2008 − Rev. 1
1
Publication Order Number:
AMIS−30512/D
1 page  
AMIS−30512
Table 4. DC Parameters (The DC parameters are given for VBB and temperature in their operating ranges unless otherwise
specified. Convention: currents flowing in the circuit are defined as positive.)
Symbol Pin(s)
Parameter
Remark/Test Conditions
Min.
Typ.
Max.
LOGICAL OUTPUTS
VOL DO, Logic Low level open drain
ERRB,
POR/WD
IOL = 5 mA
0.5
THERMAL WARNING AND SHUTDOWN
Ttw
Ttsd
(Notes 4,5)
Thermal warning
Thermal shutdown
138 145
Ttw + 20
152
CHARGE PUMP
Vcp VCP Output voltage
Cbuffer
External buffer capacitor
Cpump CPP CPN External pump capacitor
SPEED AND LOAD ANGLE OUTPUT
6 V < VBB < 15 V
15 V < VBB < 30 V
VBB+11
180
180
2 * VBB – 2.5
VBB+12.8
220
220
VBB+15
470
470
Vout
Voff
Rout
Cload
Gsla
SLA Output voltage range
Output offset the SLA pin
Output resistance SLA pin
Load capacitance SLA pin
Gain of SLA pin =
VBEMF / VCOIL
0.2 V < Vsla < Vdd − 0,2 V
0.5
-25
SLAG=0
SLAG=1
0,5
0,25
4.5
25
1
50
3. Not valid for pins with internal pull−down resistor
4. No more than 100 cumulated hours in life time above Ttw
5. Thermal shutdown and low temperature warning are derived from thermal warning.
Unit
V
°C
°C
V
V
nF
nF
V
mV
kW
pF
Table 5. AC Parameters (The AC parameters are given for VBB and temperature in their operating ranges.)
Symbol Pin(s)
Parameter
Remark/Test Conditions
Min.
Typ.
INTERNAL OSCILLATOR
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MOTORDRIVER
Frequency of internal oscillator
3.6 4
fPWM
fJF
fDF
TS_RISE
MOTXP
MOTXN
MOTYP
MOTYN
PWM frequency
Double PWM frequency
PWM Jitter frequency
PWM Jitter depth
turn-on voltage slope, 10% to 90%
IMD = 800 mA
<PWMF> = 0
20.8 22.8
<PWMF> = 1
41.6 45.6
Not measured in production
50
7
EMC[1:0] = 00
150
EMC[1:0] = 01
100
EMC[1:0] = 10
50
EMC[1:0] = 11
25
TS_FALL
turn-off voltage slope, 90% to 10%
IMD = 800 mA
EMC[1:0] = 00
EMC[1:0] = 01
150
100
EMC[1:0] = 10
50
EMC[1:0] = 11
25
tOC Open coil detection time
200
Max.
Unit
4.4 MHz
24.8
49.6
kHz
kHz
Hz
% fPWM
V/ms
V/ms
V/ms
V/ms
V/ms
V/ms
V/ms
V/ms
ms
http://onsemi.com
5
5 Page 
AMIS−30512
Icoil
Duty Cycle
< 50%
Duty Cycle > 50%
Actual value
Duty Cycle < 50%
Set value
t
TPWM
Figure 8. Automatic Duty Cycle Adaptation
Step Translator
Step Mode
The step translator provides the control of the motor by
means of SPI register Stepmode: SM[2:0], SPI register
DIRCNTRL, and input pins DIR and NXT. It is translating
consecutive steps in corresponding currents in both motor
coils for a given step mode.
One out of seven possible stepping modes can be selected
through SPI−bits SM[2:0] (Table 26: SPI Control Parameter
Overview SM[2:0]) After power−on or hard reset, the
coil−current translator is set to the default 1/32
micro−stepping at position ‘0’. Upon changing the step
mode, the translator jumps to position 0* of the
corresponding stepping mode. When remaining in the same
step mode, subsequent translator positions are all in the same
column and increased or decreased with 1. Table 9 lists the
output current versus the translator position.
As shown in Figure 9 the output current−pairs can be
projected approximately on a circle in the (Ix,Iy) plane.
There is, however, one exception: uncompensated half step.
In this step mode the currents are not regulated to a fraction
of Imax but are in all intermediate steps regulated at 100
percent. In the (Ix,Iy) plane the current−pairs are projected
on a square. Table 8 lists the output current versus the
translator position for this case.
Table 8. Square Translator Table for Full Step and Uncompensated Half Step
Stepmode ( SM[2:0] )
101 110
MSP[6:0]
Uncompensated Half−Step
Full Step
www.DataShe0e0t40U0.0c0o0m
001 0000
0*
1
−
1
010 0000
2
−
011 0000
3
2
100 0000
4
−
101 0000
5
3
110 0000
6
−
111 0000
7
0*
% of Imax
Coil x
0
100
100
100
0
−100
−100
−100
Coil y
100
100
0
−100
−100
−100
0
100
http://onsemi.com
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AMIS-30512.PDF ] | |
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