Renesas M54670P 2-phase stepper motor driver Datasheet

M54670P
2-Phase Stepper Motor Driver
REJ03F0045-0100Z
Rev.1.0
Sep.19.2003
Description
The M54670P is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the
constant current method.
Features
•
•
•
•
•
•
Wide operating voltage range (10 – 35V)
Wide output current control range (20 – 800mA)
Bipolar and constant current drive
Built in flywheel
Current level can be changed by steps or continuously.
Built in a thermal shutdown circuit
Application
Office automation equipment such as printer, FDD, HDD, and FAX
Function
The M54670P can drive a stepper motor by the 2-phase bipolar method and also control the coil current. Furthermore,
it controls the direction of the coil current with Ph input pins (pins 3 and 30).
The coil current value can be selected among four levels (0 to max.) by selecting the combination of three internal
comparators by logic input (pins 14, 15, 18 and 19). It also can be continuously controlled with VR pins (pins 2 and 31).
By selecting an I input pin among pins 14, 15, 18 or 19, the operation timing, 2-phase excitation, 1-2-phase excitation
or microstep, can be selected.
Because two control circuits are built in this IC, a stepper motor can be driven with a single IC by the 2-phase bipolar
method.
Rev.1.0, Sep.19.2003, page 1 of 10
M54670P
Pin Configuration
Triangular wave
CT 1
32 VCC
Comparator
reference input(A) VR(A) 2
Output current
direction switching(A) Ph(A) 3
Output power
supply(A) VMM1(A) 4
Output(A)
Comparator
reference input(B)
Output current
30 Ph(B) direction switching(B)
Output power
29 VMM1(B) supply(B)
O1(A) 5
6
27
7
26
8
9
10
Current sensor(A)
E(A) 11
Output(A)
O2(A) 12
Output power
supply(A) VMM2(A)
Output current
I0(A)
value setting(A)
Output current
I1(A)
value setting(A)
Comparator
C(A)
input(A)
28 O1(B) Output(B)
M54670P
GND
25
GND
24
23
22 E(B)
Current sensor(B)
21 O2(B)
Output(B)
Output power
13
20 VMM2(B) supply(B)
14
19 I0(B)
15
18 I1(B)
16
17 C(B)
Outline 32P4B
Rev.1.0, Sep.19.2003, page 2 of 10
Circuit power supply
31 VR(B)
Output current
value setting(B)
Output current
value setting(B)
Comparator
input(B)
M54670P
Ph(A)
Output current
direction switching(A)
VMM1(A)
Output power supply(A)
O1(A)
Output(A)
O2(A)
Output(A)
VMM2(A)
Output power supply(A)
VMM1(B)
Output power supply(B)
O1(B)
Output(B)
O2(B)
Output(B)
VMM2(B)
Output power supply(B)
Ph(B)
Output current
direction switching(B)
VR(B)
Comparator input(B)
32
3
4
5
12
13
29
28
21
20
30
31
Output current value
setting(A)
I0(A) 14
Output current value 15
setting(A)
I1(A)
Control circuit
VCC Circuit power supply
2
Control circuit
VR(A)
Comparator
reference input(A)
Block Diagram
Output current value
setting(B)
19 I0(B)
18 Output current value
TSD
00
10
01
11
11
01
10
6
23
10
–
–
GND
setting(B)
I1(B)
00
Power supply sensor
16
C(A)
Comparator input(A)
Triangular
wave
1
CT
Triangular wave
Power supply sensor
11
E(A)
22
GND
27
17
E(B)
Current sensor(B)
C(B)
Comparator input(B)
Current sensor(A)
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted.)
Parameter
Symbol
Ratings
Unit
Supply voltage
VCC
−0.3 to 7
V
Output supply voltage
Logic input voltage
VMM
VL
−0.3 to 40
−0.3 to 6
V
V
Comparator input voltage
Reference input voltage
VC
VR
Vcc
7
V
V
Output current
Allowable power dissipation
IO
Pd
±1.0
1.92
A
W
Operating temperature
Storage temperature
Topr
Tstg
−20 to 75
−55 to 125
°C
°C
Rev.1.0, Sep.19.2003, page 3 of 10
Conditions
Mounted on a board
M54670P
Recommended Operating Condition
(Ta = 25°C, VCC = 5.0V, unless otherwise noted.)
Limits
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Output supply voltage
VCC
VMM
4.75
10
5.00
5.25
35
V
V
Reference input voltage
Output current
IR
IO
0
20

800
800
V
mA
Logic input rise time
Logic input fall time
tPLH
tPHL
2.0
2.0
µS
µS
Thermal shutdown temperature*
TON
175
°C
Note * : Refer to "PRECAUTIONS FOR USE."
Electrical characteristics
(Ta = 25°C, VCC = 5.0V, VMM = 10V, unless otherwise noted.)
Limits
Parameter
Symbol
Min.
VIH
VIL
2.0
0
VCH
VCM
430
265
Comparator input current
VCL
ICO
90
−20
Output cutoff current
Saturation voltage
IOFF
Vsat
PWM oscillator frequency
Turnoff delay
fc
td
Supply current
Logic input current
“H”
“L”
Logic input voltage
“H”
“L”
Comparator threshold
Max.
Unit
Test conditions
Vcc
0.8
V
VCC=5V
460
285
480
305
mV
VR=5V, I0=I1=0
VR=5V, I0=1,I1=0
110
−2
130
20
µA
0
3.0
100
4.5
µA
V
33
1.0
66
2.0
KHz
µS
VMM=10V, Cf = 3900pF
Ta=25°C, dVK/dt ≥ 50mV/µs
ICC
IIH
8.0
180
25
400
mA
µA
VCC=5V
VI=2.4V
IIL
20
50
µA
VI=0.4V
16.5
Typ.
VR=5V, I0=0, I1=1
I0=I1=1(Ta=25°C)
Voltage at sensing resistor is not
included. IO=500mA
Application Description
(1) PHASE INPUT
Phase input decides the output mode.
Phase
O1
O2
H
L
H
L
H
L
Rev.1.0, Sep.19.2003, page 4 of 10
M54670P
(2) I0, I1
I0 and I1 fixed based on the comparative voltage VR decide the output current level.
I0
I1
Current level
H
H
0
L
H
Low
H
L
L
L
Typ
High
(3) VR (Comparative voltage)
The current level can be continuously changed by changing the voltage at VR continuously.
(4) Current sensor
When the voltage fall at the current sensing resistor and the selected current level become of the same level, the
output state is cut off for a certain time by inverting the comparator.
During this cutoff time, the current volume decreases slightly due to the L component of the motor and falls short of
the comparative level. During the time fixed based on the PWM frequency, the output stage goes in ON state and
then in OFF state and this ON/OFF operation is repeated.
(5) PWM oscillator
A capacitor Cf is externally connected to CT pin in order to fix the PWM oscillator frequency. The frequency fc is
calculated as follows.
fc =
1
7.77 x 103 x Cf
(6) Analog control
The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the
comparator.
(7) Thermal shutdown function
This IC has a function to protect itself against thermal damage which is caused when the chip temperature rises
abnormally.
Regarding this function, refer to “PRECAUTIONS FOR USE.”
Rev.1.0, Sep.19.2003, page 5 of 10
M54670P
Timing Chart
2-phase excitation
Phase 1
Phase 2
I0, 1(A) = 0
I0, 1(B) = 0
1-2-phase excitation
Phase 1
Phase 2
I0, 1(A)
I0, 1(B)
Microstep
Phase 1
Phase 2
I0(A)
I1(A)
I0(B)
I1(B)
Rev.1.0, Sep.19.2003, page 6 of 10
M54670P
Typical Characteristics (Absolute maximum ratings)
Safety operating range
1.0
A : Recommended
Output current IO (A)
0.8
B : Schottky diodes should be externally
connected between output pin and power supply pin.
B
0.6
C : Schottky diodes should be externally connected between output pin
and power supply pin and between output pin and GND pin.
0.4
A
0.2
0
10
0
C
20
30
50
35 40
Output VMM (V)
Thermal derating
θj-c = 20°C/W
C
Allowable power dissipation (W)
4.0
A : Free air
(θc-a = 50°C/W)
B : With 10cm2 aluminum heat
(θc-a = 25°C/W)
3.0
B
C : With 100cm2 aluminum heat
(θc-a = 10°C/W)
2.0
A
Tj(max) = 150°C
1.0
0
0
10
20
30
40
50
Ambient (°C)
Rev.1.0, Sep.19.2003, page 7 of 10
60
70
80
M54670P
Application Example (Stepping motor driver)
VR
1
CT
VCC
32
2
VR(A)
VR(B)
31
3
Ph(A)
Ph(B)
30
4
VMM1(A)
VMM1(B)
29
5
O1(A)
O1(B)
28
VCC
Cf
Phase A
6
27
7
26
GND
9
M54670P
8
GND
25
23
E(A)
E(B)
22
RS
RS
RC
IN(A)
12
O2(A)
O2(B)
21
13
VMM2(A)
VMM2(B)
20
14
I0(A)
I0(B)
19
15
I1(A)
I1(B)
18
RC
IN(B)
CC
CC
16
C(A)
C(B)
17
Cf = 3900pF
RS = 0.51Ω
RC = 1kΩ
CC = 820pF
Stepper motor
(3.7mH / 6Ω / phase)
Rev.1.0, Sep.19.2003, page 8 of 10
VMM
40µF/50V
0.01
µF
24
10
11
Phase B
M54670P
Precautions for use
(1) When the whole output current changes by a large margin (for example, when thermal shutdown operation causes
intermittent flow of output current), the supply voltage may undergo a change. Therefore, selection and wiring of
power supply should be conducted cautiously to avoid such a situation that the supply voltage exceeds the absolute
maximum ratings.
(2) When the supply voltage changes by a large margin, the operation of this IC may become unstable. In this case, the
change of supply voltage can be controlled by connecting a capacitor between Vcc pin and GND pin.
(3) Thermal shutdown function
The state of thermal shutdown operation may differ according to the way of wiring within a board. Therefore,
sufficient board evaluation should be conducted before use. When the board is changed, operation on the replacing
board should be evaluated.
The circuit board on which this IC is mounted is designed to realize low impedance between power supply and
output pin.
Therefore, it is desirable to take a safe measure such as fixing a fuse to avoid such a situation that the board is
damaged by a fire when output pin is internally short-circuited by excessively applied surge voltage by accident.
Rev.1.0, Sep.19.2003, page 9 of 10
SEATING PLANE
e
D
b1
b
16
Lead Material
Alloy 42/Cu Alloy
1
Weight(g)
2.2
17
JEDEC Code
—
MMP
32
EIAJ Package Code
SDIP32-P-400-1.78
A
L
Rev.1.0, Sep.19.2003, page 10 of 10
b2
A2
A1
A
A1
A2
b
b1
b2
c
D
E
e
e1
L
Symbol
Plastic 32pin 400mil SDIP
c
Dimension in Millimeters
Min
Nom
Max
—
—
5.08
0.51
—
—
—
3.8
—
0.35
0.45
0.55
0.9
1.0
1.3
0.63
0.73
1.03
0.22
0.27
0.34
27.8
28.0
28.2
8.75
8.9
9.05
—
1.778
—
—
10.16
—
3.0
—
—
0˚
—
15˚
e1
32P4B
M54670P
Package Dimensions
E
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Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
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