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PDF AMIS-30521 Data sheet ( Hoja de datos )
| Número de pieza | AMIS-30521 | |
| Descripción | Micro-stepping Motor Driver | |
| Fabricantes | AMI SEMICONDUCTOR | |
| Logotipo |  |
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AMIS-30521 Micro-stepping Motor Driver
Data Sheet
1.0 Introduction
The AMIS-30521 is a micro-stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and an
SPI interface with an external microcontroller. The AMIS-30521 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-30521 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-30521 is ideally suited for general-purpose stepper motor applications in the automotive, industrial, medical, and marine
environment.
2.0 Key Features
• Dual H-Bridge for 2-phase stepper motors
• Programmable peak-current up to 1.6A 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
• Fully integrated 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 5V and 3.3V microcontrollers
ww3w..0DaOtaSrhdeeet4rUi.ncogm information
Table 1: Ordering Information
Part No.
AMIS-30521 ANA
Package
NQFP-32 (7 x 7mm)
Peak Current
1600mA
Temp. Range
-40°C…..125°C
Ordering Code
Tubes
0C521-001-XTD
Ordering Code
Tapes
0C521-001-XTP
AMI Semiconductor – June 2007, M-20683-001
www.amis.com
1
1 page  
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
6.3 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.
Table 5: DC Parameters
Symbol
Pin(s) Parameter
Remark/Test Conditions
Supply Inputs
VBB
Ibat
VBB
Vdd VDD
Nominal operating supply range
Total current consumption
Logic supply voltage
Unloaded outputs
Power-on-Reset (POR)
VDDH
VDDL
VDD
Internal POR comparator threshold
Internal POR comparator threshold
VDD rising
VDD falling
Motordriver
IMDmax,Peak
IMDmax,RMS
Max current through motor coil in
normal operation
Max RMS current through coil in normal
operation
IMDabs
IMDrel
RHS
RLS3
RLS2
RLS1
RLS0
IMpd
MOTXP
MOTXN
MOTYP
MOTYN
Absolute error on coil current
Error on current ratio Icoilx / Icoily
On-resistance high-side driver,
CUR[4:0] = 0...31
On-resistance low-side driver,
CUR[4:0] = 23...31
On-resistance low-side driver,
CUR[4:0] = 16...22
On-resistance low-side driver,
CUR[4:0] = 9...15
On-resistance low-side driver,
CUR[4:0] = 0...8
Pull-down current
Vbb = 12V, Tj = 27 °C
Vbb = 12V, Tj = 160 °C
Vbb = 12V, Tj = 27 °C
Vbb = 12V, Tj = 160 °C
Vbb = 12V, Tj = 27 °C
Vbb = 12V, Tj = 160 °C
Vbb = 12V, Tj = 27 °C
Vbb = 12V, Tj = 160 °C
Vbb = 12V, Tj = 27 °C
Vbb = 12V, Tj = 160 °C
HiZ mode
Logic Inputs
Ileak DI, CLK Input leakage (3)
VinL NXT, DIR Logic low threshold
VinH CLR, CSB Logic high threshold
wwRwpd.DataSheet4UTC.ScLToR0m Internal pull-down resistor
Tj = 160 °C
Thermal Warning and Shutdown
Ttw
T (1) (2)
tsd
Thermal warning
Thermal shutdown
Charge Pump
Vcp
Cbuffer
Cpump
VCP Output voltage
External buffer capacitor
CPP CPN External pump capacitor
6V< VBB < 15V
15V < VBB < 30V
Min.
6
4.75
4.0
Typ.
5
4.25
3.68
Max.
30
8
5.25
4.4
Unit
V
mA
V
V
V
1600
mA
800 mA
-10 10 %
-7 7 %
0.45 0.56 Ω
0.94 1.25 Ω
0.45 0.56 Ω
0.94 1.25 Ω
0.90 1.2 Ω
1.9 2.5 Ω
1.8 2.3 Ω
3.8 5.0 Ω
3.6 4.5 Ω
7.5 10 Ω
0.5 mA
1 µA
1.5 V
3.5 V
120 300 kΩ
138
VBB+12.5
180
180
145
Ttw + 20
152
2 * VBB – 2.5
VBB+14
220
220
VBB+15.5
470
470
°C
°C
V
V
nF
nF
Notes:
(1) No more than 100 cumulated hours in life time above Ttw.
(2) Thermal shutdown and low temperature warning are derived from thermal warning.
(3) Not valid for pins with internal pull-down resistor.
AMI Semiconductor – June 2007, M-20683-001
www.amis.com
5
5 Page 
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
Iy
Start = 0
Step 1
Step 2
Step 3
Ix
Iy
Start = 0
Step 1
IxStep 2
Step 3
1/4th micro step
SM[2:0] = 011
Uncompensated Half Step
SM[2:0] = 101
PC20070604.5
Figure 8: Translator Table: Circular and Square
8.3.2. Direction
The direction of rotation is selected by means of following combination of the DIR input pin and the SPI-controlled direction bit
<DIRCTRL>. (Table 14: SPI Control Register 1)
8.3.3. NXT Input
Changes on the NXT input will move the motor current one step up/down in the translator table. Depending on the NXT-polarity bit
<NXTP> (Table 14: SPI Control Register 1), the next step is initiated either on the rising edge or the falling edge of the NXT input.
tNXT_HI
tNXT_LO
www.DataSheet4U.com
NXT
0,5 VCC
tDIR_SET
tDIR_HOLD
DIR VALID
Figure 9: NXT-input Timing Diagram
PC20070609.1
Table 11: Timing Table NXT Pin
Symbol
tNXT_HI
tNXT_LO
tDIR_SET
tDIR_HOLD
Parameter
NXT minimum, high pulse width
NXT minimum, low pulse width
NXT hold time, following change of DIR
NXT hold time, before change of DIR
Min.
2
2
500
500
Typ.
Max.
Unit
µs
µs
µs
µs
AMI Semiconductor – June 2007, M-20683-001
www.amis.com
11
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