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
3.0 Ordering 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
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
4.0 Block Diagram
VDD
CPN CPP VCP
VBB
CLK
Timebase
Chargepump
POR
EMC
T
R
A
N
S
L
A
T
O
R
P
W
M
I-sense
CS
DI
DO
NXT
DIR
SLA
Temp.
Sense
Logic &
Registers
Load
Angle
SPI
OTP
MOTXP
MOTXN
EMC
P
W
M
I-sense
MOTYP
MOTYN
CLR
ERR
Band-
gap
AMIS-30521
PC20070322.1
GND
Figure 1: Block Diagram AMIS-30521
5.0 Pin Description
Table 2: Pin List and Description
Name
Pin
DO
31
VDD
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
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
MOTXP
MOTXP
TSTO
VDD
32
VBB
DO
31
30
29
28
27
26
25
GND
DI
CLK
NXT
DIR
ERR
SLA
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
GND
GND
MOTXN
MOTXN
MOTYN
MOTYN
GND
GND
AMIS-30521
9
10
11
12
13
14
15
16
MOTYP
VBB
MOTYP
CLR
Figure 2: Pin Out AMIS-30521
CPP
CPN
VCP
CS
PC20070309.2
5.1 Package Thermal Characteristics
The NQFP is designed to provide superior thermal performance, and using an exposed die pad on the bottom surface of the package
partly contributes to this. In order to take full advantage of this thermal performance, the PCB must have features to conduct heat away
from the package. A thermal grounded pad with thermal vias can achieve this. With a layout as shown in
Figure 3:
PCB Ground Plane
Layout Condition, the thermal resistance junction – to – ambient can be brought down to a level of 30°C/W.
NQFP-32
PC20041128.2
Figure 3: PCB Ground Plane Layout Condition
AMI Semiconductor
– June 2007, M-20683-001
www.amis.com
3
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
6.0 Electrical Specification
6.1 Absolute Maximum Ratings
Stresses above those listed in table below may cause immediate and permanent device failure. It is not implied that more that one of
these conditions can be applied simultaneously.
Table 3: Absolute Maximum Ratings
Symbol
Parameter
(1)
V
BB
Analog DC supply voltage
V
DD
Logic supply voltage
Tstrg
Storage temperature
Tamb
Ambient temperature under bias
(2)
V
ESD
Electrostatic discharges on component level
Notes:
(1)
(2)
For limited time <0.5s.
Human body model (100pF via 1.5 kΩ, according to JEDEC EIA-JESD22-A114-B).
Min.
-0.3
-0.3
-55
-50
-2
Max.
+40
+7.0
+160
+150
+2
Units
V
V
°C
°C
kV
6.2 Recommend Operation Conditions
Operating ranges define the limits for functional operation and parametric characteristics of the device. Note that the functionality of the
chip outside these operating ranges is not guaranteed. Operating outside the recommended operating ranges for extended periods of
time may affect device reliability.
Table 4: Operating Ranges
Symbol
Parameter
V
BB
Analog DC supply
V
DD
Logic supply voltage
(1)
Iddd
Dynamic current
T
a
Ambient temperature VBAT≤+18
T
a
Ambient temperature VBAT≤+29
T
j
Junction temperature
Notes:
(1)
Min.
+6
4.75
-40
-40
Max.
+30
5.25
18
+125
+85
+160
Unites
V
V
mA
°C
°C
°C
Dynamic current is with oscillator running, all analogue cells active. All outputs unloaded, no floating inputs.
AMI Semiconductor
– June 2007, M-20683-001
www.amis.com
4
AMIS-30521 Micro-stepping Motor Driver
Data Sheet
6.3 DC Parameters
The DC parameters are given for V
BB
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
Supply Inputs
V
BB
Nominal operating supply range
VBB
I
bat
Total current consumption
V
dd
VDD
Logic supply voltage
Power-on-Reset (POR)
V
DDH
Internal POR comparator threshold
VDD
V
DDL
Internal POR comparator threshold
Motordriver
Max current through motor coil in
I
MDmax,Peak
normal operation
Max RMS current through coil in normal
I
MDmax,RMS
operation
I
MDabs
Absolute error on coil current
I
MDrel
Error on current ratio I
coilx
/ I
coily
On-resistance high-side driver,
R
HS
MOTXP CUR[4:0] = 0...31
MOTXN On-resistance low-side driver,
R
LS3
MOTYP CUR[4:0] = 23...31
MOTYN
On-resistance low-side driver,
R
LS2
CUR[4:0] = 16...22
On-resistance low-side driver,
R
LS1
CUR[4:0] = 9...15
On-resistance low-side driver,
R
LS0
CUR[4:0] = 0...8
I
Mpd
Pull-down current
Logic Inputs
(3)
I
leak
DI, CLK Input leakage
NXT, DIR Logic low threshold
V
inL
CLR, CSB Logic high threshold
V
inH
CLR
R
pd
Internal pull-down resistor
TST0
Thermal Warning and Shutdown
T
tw
Thermal warning
(1) (2)
T
tsd
Thermal shutdown
Charge Pump
V
cp
C
buffer
C
pump
VCP
Output voltage
Remark/Test Conditions
Min.
6
Typ.
Max.
30
8
5.25
4.4
Unit
V
mA
V
V
V
mA
mA
Unloaded outputs
4.75
VDD rising
VDD falling
4.0
5
4.25
3.68
1600
800
-10
-7
V
bb
= 12V, T
j
= 27 °C
V
bb
= 12V, T
j
= 160 °C
V
bb
= 12V, T
j
= 27 °C
V
bb
= 12V, T
j
= 160 °C
V
bb
= 12V, T
j
= 27 °C
V
bb
= 12V, T
j
= 160 °C
V
bb
= 12V, T
j
= 27 °C
V
bb
= 12V, T
j
= 160 °C
V
bb
= 12V, T
j
= 27 °C
V
bb
= 12V, T
j
= 160 °C
HiZ mode
Tj = 160 °C
3.5
120
138
145
T
tw
+ 20
2 * V
BB
– 2.5
V
BB
+14
220
220
0.45
0.94
0.45
0.94
0.90
1.9
1.8
3.8
3.6
7.5
0.5
10
7
0.56
1.25
0.56
1.25
1.2
2.5
2.3
5.0
4.5
10
%
%
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
mA
µA
V
V
kΩ
°C
°C
V
V
nF
nF
1
1.5
300
152
6V< V
BB
< 15V
15V < V
BB
< 30V
External buffer capacitor
CPP CPN External pump capacitor
V
BB
+12.5
180
180
V
BB
+15.5
470
470
Notes:
(1) No more than 100 cumulated hours in life time above Tt
w.
(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
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