Mitsubishi M56755AFP Datasheet

MITSUBISHI <CONTROL / DRIVER IC>

M56755AFP

SPINDLE MOTOR DRIVER

DESCRIPTION

The M56755AFP is a semiconductor integrated circuit designed for
a single chip controller for CD-ROM spindle motor.
M56755AFP has a both (forward and reverse) motor torque control
by the motor speed control terminal.
M56755AFP has the several braking mode that an user can flexibly
select in order to generate the reverse torque. Also, this device
includes a bias circuit for Hall Sensor, a current limit circuit and a
thermal shut down function.

FEATURES

●3.3V DSP available.

●The supply voltage with wide range.

(4.5V to 13.2V)

●High motor drive current (1.2A).

●Motor current control for the both motor torque is possible.

●Reverse torque mode select [SHORT BRAKING, etc]

●Sleep mode

●Hall amplifier sensitivity select

●Automatic stop select (with reverse detected signal pin)

APPLICATION

Above 8 times speed CD-ROM, DVD, DVD-ROM etc.

PIN CONFIGURATION (TOP VIEW)

1

S/S

2

RDS

3

FG

4

I

C
MODE2
MODE1

7
8

GND GND

13

M

V

14

VCC2

15 22

EC

16

ECR

17

CC1

V

18

HB

36
35
34
33
325
316
30

M56755AFP

29
289
2710
2611
2512
24
23

21
20
19

W
V
U

S

R
MODE3
MODE4

Hw­Hw+
Hv­Hv+
Hu­Hu+

BLOCK DIAGRAM

VM

13

VCC2

14

MODE1

MODE2

MODE4

MODE3

FG

RDS

6

5

31

32

3

2

BRAKING
MODE
CHANGE

SENSE

FG
RDS

W

34 35 36

120°

MATRIX

+- +- +-

19 20 21 22 23 24

Hu+ Hu- Hv+ Hv- Hw+ Hw-

S/S

1 1733

I / I

Converter

TSD

Hall
Bias

18

HB

4

I

C

Outline 36P2R-D

RSVU

-

+
+

15 16

EC

Vref

V/I Converter

VCC1

7 to 12

GND

25 to 30

GND

ECR

PIN FUNCTION

(c)

j

MITSUBISHI <CONTROL / DRIVER IC>

M56755AFP

SPINDLE MOTOR DRIVER

Symbol FunctionPin No. Pin No.

1

S/S

2

RDS

3

FG

4

C

I

5

MODE2

6

MODE1

7 12

–

13
14
15
16
17
18

*The pin[RDS] and pin[FG] are with pull-up resistor (10kohm).

GND
V

M

VCC2
EC
ECR
V

CC1

HB

2 3

Start/ Stop
Reverse detected signal
Frequency generator output
Phase Compensation
Reverse torque mode select 2
Reverse torque mode select 1
GND
Motor supply voltage
12V supply voltage
Motor speed control
The reference voltage for EC
5V supply voltage
Bias for Hall Sensor

19
20
21
22
23
24

25 30

–

31
32
33
34
35
36

Symbol

Hu+
Hu­Hv+
Hv­Hw+
Hw­GND
MODE4
MODE3
R

S

U
V
W

Hu+ Sensor amp. input
Hu- Sensor amp. input
Hv+ Sensor amp. input
Hv- Sensor amp. input
Hw+ Sensor amp. input
Hw- Sensor amp. input
GND
Hall amplifier sensitivity select
Automatic stop select
Motor current sense
Motor drive output U
Motor drive output V
Motor drive output W

ABSOLUTE MAXIMUM RATING (Ta = 25°C)

Symbol Conditions UnitsParameter

M Motor supply voltage pin maximum input voltage 16

V
VCC2
V

CC1

Io
VH
Pt

Kθ
T
Topr
Tstg

Output current
Sensor amp.

Differential input range
Power dissipation
Thermal derating
Junction temperature
Operating temperature
Storage temperature

*Note1; There is no overing Pt (power dissipation) or the area of safety operation.

13
14
17

pin maximum input voltage

*Note 1

19 24

– pins

Free Air

Function

Rating

4.5

1.2

9.6

150

-20 – +75

-40 – +125

V
V12V supply voltage pin maximum input voltage 16
V5V supply voltage 7.0
A1.5

V

WFree Air

mW/°C

°C
°C
°C

MITSUBISHI <CONTROL / DRIVER IC>

[

]

]

µAµ

M56755AFP

SPINDLE MOTOR DRIVER

RECOMMENDED OPERATING CONDITIONS

Symbol

CC1 5V Power supply

V

CC2 V

VM
Io

12V Power supplyV
Motor Power supply
Output drive current

Parameter

Min.

4.5

4.5

4.5
—

Limits

Typ.

5.0

12.0

12.0
—

Max.

5.5

13.2

13.2
700

ELECTRICAL CHARACTERISTICS (VCC = 5V, VCC2 = 12V ,VM = 12V, Ta = 25°C unless otherwise noted.)

Symbol Conditions UnitsParameter

CC1 Sleep Mode Supply current - 1 and pin total Input Current [ pin lo or open]

I
ICC2
ICC3

Vsat
ECdead-

ECdead+
ECR
EC
Gio
Vlim

VH com
VHmin1

VHmin2

Sleep Mode Supply current - 2
Supply current - 3

Saturation voltage

Control voltage dead zone
Reference voltage Input range

Control voltage Input range
Control gain
Control limit
Hall sensor amp common

mode input range
Hall sensor amp.

input signal revel

13 14 1
17

pin Input Current [ pin lo or open]

17

pin Input Current (EC = ECR = 2.5V) [ pin Hi]

1

Top and Bottom saturation voltage
Load current 500mA

EC < ECR
EC > ECR

pin Input voltage range [3.3V DSP available]

16
15

pin Input voltage range [3.3V DSP available]

Io = Gio / Rsense

A/V

Ilim = Vlim / Rsense [A

– pins input range

19 24

19 24

– pins input signal

MODE4 = open
MODE4 = GND

Units

V

V

mA

Limits

Min.

—
—

1

—
—

-40
0

0.5

0.5

0.25

0.27

1.2

50
35

Typ.

0
—
—

1.2

-21

+21

1.65

1.65

0.3

0.3
—

—
—

Max.

100
500

6.0

1.9
0

+40

4.0

4.0

0.35

0.33

4.5

—
—

mVp-p

A

mA

V

mV

V
V

V/V

V
V

MITSUBISHI <CONTROL / DRIVER IC>

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q

M56755AFP

SPINDLE MOTOR DRIVER

ELECTRICAL CHARACTERISTICS (VCC = 5V, VCC2 = 12V ,VM = 12V, Ta = 25°C unless otherwise noted.)

mbol Conditions

S

VHb

Hall bias terminal output
voltage

Parameter

Load current (IHb) 10mA.

Min. Typ. Max.

0.6

Limits

0.85

Units

1.2

V

IHb

Von

Hall bias terminal sink current

Motor start voltage

1

pin input voltage when makes the motor start up.

*The ICs will be the active condition.
*The hall bias will be available.

1

pin input voltage when makes the motor stop.

Voff

Motor stop voltage

*The ICs will be the sleep condition.
*The hall bias will be off.

6 5 32

pin [MODE1], pin [MODE2], pin [MODE3]

31

H

Vi

mode pin input high voltage

and pin [MODE4] input voltage
when makes high level.

6 5 32

pin [MODE1], pin [MODE2], pin [MODE3]

ViL

mode pin input low voltage

31

and pin [MODE4] input voltage
when makes low level.

2 3

VOL

pin[RDS], pin[FG] output

low voltage

at Io current = 1mA

ELECTRICAL CHARACTERISTICS

(VCC=5V, VM=12V, Ta=25°C Unless otherwise noted.)

Reverse Torque

Current limit

—

2.0

—

2.0

—

—

—

—

—

—

—

—

30

—

0.8

—

0.8

0.5

mA

V

V

V

V

V

0 – +40mV

0.6A/V

0

EC - ECR

The relationship between the EC (control
voltage), ECR (reference voltage) and the
torque is as shown in Figure 1. The current
gain is 0.6A/V (at sensing resistor: 0.5ohm) in
the both torques and a dead zone is ±0mV to

0.6A/V

0 – -40mV

±40mV.

Current limit

Forward Tor

ue

Figure 1. The characteristics of the control voltage and motor current (Torque).

HALL AMPLIFIER INPUT AND COMMUTATION

The relationship between the hall amplifier inputs voltage and the
motor current outputs is as shown in Figure 2.

MITSUBISHI <CONTROL / DRIVER IC>

M56755AFP

SPINDLE MOTOR DRIVER

Hu+Hv+Hw+ Hall elements

Hall
inputs

Output
current

V

U

W

V

UVW WU

Figure 2.

HALL AMPLIFIER INPUT SENSITIVITY SELECT

MODE4

OPEN or HIGH GND

120 degree
soft switching

The hall amp
input voltage
minimum is
50mVp-p.

120 degree switching

** Io current

will be shape.

The hall amp
input voltage
minimum is
35mVp-p.

Figure 3.

SOURSE

SINK

U

V

W

U

W

V

W

U

FORWARD

EC < ECR

V

U

W

V

Outer loator

REVERSE

EC > ECR

Figure 3 shows the hall amplifier input sensitivity select function.
An user is able to select the sensitivity of a hall amplifier to match
with the hall elements type.
If the output minimum level of a hall elements is a low level as
below 50mVp-p, please connect the MODE4 to GND at external.
In this case, the output current will be shape. If the output minimum
level of a hall elements is more higher than 50mVp-p, please make
the MODE4 to open, then the output current will be commutated
softly.
We recommend that the output level of a hall element is used for
80mVp-p to 120mVp-p and the MODE4 is made to open.

SLEEP MODE FUNCTION

START / STOP

LOW or OPEN HIGH

Motor Stop

Bias off

Hall-Bias off

Motor on

Bias on

Hall-Bias on

Figure 4.

Figure 4 shows the sleep mode function. If the pin [S/S] is set to

1

open or low, the current output will be high impedance and then
the motor will be stop. Also, the IC bias current wil be a slight
current (please make reference the electrical characteristics). At
the same time, the hall bias output will be cut off. When the pin

1

goes high, the all of circuits will be available.

MITSUBISHI <CONTROL / DRIVER IC>

NG

s

M56755AFP

SPINDLE MOTOR DRIVER

FORWARD AND REVERSE ROTATION DETECT

Figure 5 shows the circuits and function of the forward and reverse
rotation detect.
The RDS is the output signal pin that detected by the signal of hall
inputs (Hu+, Hu-, Hv+ and Hv-). The RDS pin is pulled-up to VCC1
by internal resistor (typ. 10kohm). When the motor is spinning at
forward, the RDS pin output will be a low level. When the rotation
of motor is reversed at stop mode, it will be a high level.

AUTOMATICALY S TOP AFTER REVERSE BRAK-I

Figure 5 shows the automaticaly stop circuits after the reverse
braking, too. Figure 6 shows its function table. The MODE3 is the
input pin in order to be selected either the automaticaly stop or
non-stop. When the MODE3 is open, the motor rotation will be
stopped automaticaly after the reverse braking in order to make
stop the motor. When the MODE3 is connected to GND, the motor

RDS FG

VCC1

MODE3

CC1

V

FG-amp

CI

+

-

will continue the reversed rotation. This mode [MODE3=GND] is
available for the case that an user hope to control the motor
stopping at external.

FG FUNCTION

Figure 5 shows the circuits and function of the frequency
generator, too. The FG is the pin that output the signal synchronize
with the hall inputs [Hv+ and Hv-] timming.
The FG pin is pulled-up to VCC1 by internal resistor [typ. 10Kohm].

MODE3

OPEN or HIGH

AUTOMATIC

STOP

GND

UN-AUTOMATIC

(NON-STOP)

Figure 6 .

Hu+ Hu- Hv+ Hv- Hw+ Hw-

.

Figure 5.

FORWARD

High

RDS

Low

High

FG

Low

Q

TDQ

R

EC-ECR

Hu+

Hv+Hw+

D
T

Q

+

-

REVERSE

Comparator
H

ystelesi

RDS

FG

D
T

Q

High

Low

High

Low

Hw+

Hall sensor-amp

Hu+

Hv+

MITSUBISHI <CONTROL / DRIVER IC>

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G

3.0

5.0V0

O

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600mA(Vbe

a

ode voltage

age

ce

3.0

5.0V0

M56755AFP

SPINDLE MOTOR DRIVER

REVERSE TORQUE MODE SELECT FUNCTION

At the 4 times speed and the 6 times speed CDROM drive system,
the reverse braking style has been used for the reverse torque.
However, at the 8 times speed CDROM drive system, the motor
current will be needed above 0.7A, if an user of driver IC require a
high speed access time.
If the reverse braking is used at 0.7A, the IC junction temperature
will be too much high.
Therefore, MITSUBISHI new motor driver has the braking mode
select function. This mode select function is available in order to
control flexibly in match with the situation of junction temperature.
Figure 7 shows the reverse torque mode select function table.

BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE

MODE1

LOW or OPEN

MODE2

LOW
or
OPEN

HIGH

COMMUTATED SHORT
BRAKIN

REVERSE BRAKING

SHORT BRAKING (2

ALL SHORT
BRAKIN

OUTPUT OPEN
[only inertia]

Figure 7.

If you hope original (the reverse braking) style, please only select
REVERSE BRAKING mode [MODE1 = LOW or OPEN and
MODE2 = HIGH] at external. If it is possible to get two more port
from µcom, you can flexibly control the four kinds of BRAKING
MODE. If you can only get one more port, you can control only the
MODE2. Then, you can control the two kinds of BRAKING MODE
[commutated short or reverse] under the MODE1 is set to LOW or
OPEN.

Figure 8 shows an example for the reverse torque
mode select.

HIGH

The CASE1 is an controlling example for REVERSE
and COMMUTATED SHORT BRAKING.
The CASE2 is an controlling example for REVERSE
and ALL SHORT BRAKING.

CASE 1

REVERSE AND COMMUTATED SHORT
BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

V

2.5V

ECR

2.0V

V

HIGH

MODE2

W

L

MODE1

LOW

BRAKING
MODE

+1A

FORWARD
CURRENT

REVERSE
TORQUE
CURRENT

-1A

Commu­tated short
BRAKING

MOTOR CURRENT [ Rsense = 0.5 ohm]

-600mA

Figure 8.

REVERSE
BRAKING

+600mA

MOTOR
STOP

2.5V

ECR

2.0V

HIGH

MODE2

L

MODE1

LOW

BRAKING
MODE

+1A

FORWARD
CURRENT

REVERSE
TORQUE
CURRENT

CASE 2

REVERSE AND ALL SHORT BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

V

V

W

ALL
SHORT
BRAKING

MOTOR CURRENT

-1A
mf-Vd-Vsat) / R

Vsat ; npn transistor saturation volt

REVERSE
BRAKING

+600mA

-

Vd ; di

Ra ; motor inner resistan

MOTOR
STOP

MITSUBISHI <CONTROL / DRIVER IC>

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)

BASICALLY CHARACTERISTICS This data is an example for typical sample.

Output saturation voltage and Load current Characteristics. (Condition Vcc2 = Vm = 12V, Vcc = 5V)

12.0

M56755AFP

SPINDLE MOTOR DRIVER

11.5

11.0

10.5

Output Voltage (V)

1.5

1.0

0.5

0.76

0.07

0

0

Output saturation voltage and Load current Characteristics. (At bootstrap)

If you use a bootstrap as below,it is possible to make low the output
saturation voltage. (Condition Vcc2=6V,Vm=5V,Vcc=5V)

0.79

200 400 600 800 1000

0.13

0.86

0.25

0.89

0.32

Load current (mA

0.91

This device can use this voltage value
due to motor drive.

0.38

0.98

0.49

1.05

0.62

Top side
saturation voltage

1.18

0.76

Bottom side
saturation voltage

1200

5.0

4.5

4.0

3.5

Output Voltage (V)

1.5

1.0

0.5

0.06

0.07

0

0

0.29

0.12

0.23

0.25

0.13

0.32

200 400 600 800 1000

Load current (mA

0.35

This device can use this voltage value
due to motor drive.

0.38

0.47

0.49

0.62

0.62

0.83

0.76

1200

Top side
saturation voltage

Bottom side
saturation voltage

MITSUBISHI <CONTROL / DRIVER IC>

(mA)

)

(W)

SPINDLE MOTOR DRIVER

HB terminal voltage and Hall current characteristics. (Condition : Vcc = 4.4V – 7V)

1.6

1.4

1.2

1.0

0.85

0.8

0.6

HB terminal voltage (V)

0.4

M56755AFP

0.2

0

0

THERMAL DERATING

6.0

5.0

4.5

4.0

3.0

2.0

Power Dissipation (Pdp)

1.2

1.0

0 25 50 75 100 125 150

10

20 30

Hall current

With infinite heatsink

Without heatsink

Ambient Temperature (Ta

40 50

(°C)

APPLICATION CIRCUIT

µ

MITSUBISHI <CONTROL / DRIVER IC>

M56755AFP

SPINDLE MOTOR DRIVER

5V

Hall bias
resistance

Hu

Hv

Hw

Forward
reverse
rotation
signal

2

19

20

21

22 23 24

FG

signal

3

FG

RDS

+-

+-

+-

com control
BRAKING

MODE

SELECT

0 to 1.5

10uF

13

32

31

SENSE

6

CHANGE

MATRIX

120°

BRAKING

MODE

14

5

34

104

35

104

36

12V
Motor
power
supply

104

Control
PWM1

Reference
PWM2

104

18

4

15

16

Bias

Hall

V/I Converter

TSD

Converter

I / I

+

7 to 12 and 25 to 30

+

-

Vlim

1

1733

Start / Stop

Motor current sense resistor

0.5

10uF

5V
Power
Supply