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AMI SEMICONDUCTOR

AMIS-30521 Datasheet Preview

AMIS-30521 Datasheet

Micro-stepping Motor Driver

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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
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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




AMI SEMICONDUCTOR

AMIS-30521 Datasheet Preview

AMIS-30521 Datasheet

Micro-stepping Motor Driver

No Preview Available !

AMIS-30521 Micro-stepping Motor Driver
Data Sheet
4.0 Block Diagram
VDD CPN CPP VCP VBB
CLK
Timebase
Chargepump
CS
DI
DO
NXT
DIR
SLA
CLR
ERR
SPI
PC20070322.1
Logic &
Registers
POR
OTP
Load
Angle
Temp.
Sense
EMC
P
TW
RM
A
N
I-sense
S
L
A
T
EMC
OP
RW
M
I-sense
Band-
gap
AMIS-30521
GND
Figure 1: Block Diagram AMIS-30521
MOTXP
MOTXN
MOTYP
MOTYN
5.0 Pin Description
Table 2: Pin List and Description
Name
Pin
DO
wwwV.DDDataSheet4U.com
31
32
GND
1
DI 2
CLK 3
NXT
4
DIR 5
ERRB
6
SLA 7
CPN
9
CPP
10
VCP
11
CLR
12
CSB
13
VBB
14
MOTYP
15, 16
GND
17, 18
MOTYN
19, 20
MOTXN
21, 22
GND
23, 24
MOTXP
25, 26
VBB
27
/ 8, 28, 30
TST0
29
Description
SPI data output
Logic Supply Input (needs external decoupling capacitor)
Ground, heat sink
SPI data in
SPI clock input
Next micro-step input
Direction input
Error Output
Speed Load Angle Output
Negative connection of charge pump capacitor
Positive connection of charge pump capacitor
Charge-pump filter-capacitor
“Clear” = Chip Reset input
SPI chip select input
High Voltage Supply Input
Negative end of phase Y coil output
Ground, heat sink
Positive end of phase Y coil output
Positive end of phase X coil output
Ground, heat sink
Negative end of phase X coil output
High Voltage Supply Input
No Function (to be left open in normal operation)
Test pin (to be tied to ground in normal operation) input
AMI Semiconductor – June 2007, M-20683-001
www.amis.com
2


Part Number AMIS-30521
Description Micro-stepping Motor Driver
Maker AMI SEMICONDUCTOR
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AMIS-30521 Datasheet PDF






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