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L7200

September 1999

This is preliminary information on a new product now in development. Details are subject to change without notice.

GENERAL

12V (+/- 10%) OPERATION.

MINIMUM EXTERNAL COMPONENTS

BCD TECHNOLOGY

VCM DRIVER

1.7A DRIVE CAPABILITY

0.75

TOTAL BRIDGE IMPEDANCE AT 125癈

LINEAR MODE

PHASE SHIFT MODULATION (PWM MODE)

INSTANTANEOUS, (GLICH FREE) SWITCH

BETWEEN THE 2 MODES.

CLASS AB OUTPUT DRIVERS

ZERO CROSSOVER DISTORSION

14 BIT DAC DEFINE OUTPUT CURRENT

SELECTABLE TRANSCONDUCTANCE

RAMP LOADING & PARKING VOLTAGE

FULL INTERNAL VCM CALIBRATION

DYNAMIC BRAKE

SPINDLE DRIVER

2.5A DRIVE CAPABILITY

0.75

TOTAL BRIDGE IMPEDANCE AT

125癈

SMOOTHDRIVETM ARCHITECTURE

SINUSOIDAL DRIVING, VOLTAGE MODE

BIPOLAR DRIVING

BEMF, INTERNAL OR EXTERNAL,
PROCESSING

SENSOR-LESS MOTOR COMMUTATION

PROGRAMMABLE COMMUTATION DELAY

FIXED FREQUENCY PWM OPERATION
MODE

INTERNAL FREQUENCY LOCKED LOOP
SPEED CONTROL (FLL)

PROGRAMMABLE DIGITAL FILTER FOR
SPEED CONTROL LOOP

BEMF RECTIFICATION DURING RETRACT

BUILT-IN INDUCTIVE SENSING START UP

DYNAMIC & REVERSE BRAKE

BACK ROTATION DETECTION

OTHER FUNCTIONS

12V, 5V , 3.3V AND 2.5V MONITORING WITH
POSSIBLE EXTERNAL SET TRIP POINTS
AND HYSTERESIS

POWER UP/DOWN SEQUENCING

8V, 3.3V AND 2.5V POSITIVE REGULATORS

3.3V LOGIC COMPATIBILITY

SHOCK SENSOR DETECTOR

INTERNAL POR DELAY TIME AT POWER ON
(80ms)

INTERNAL ISOFET FOR BEMF
RECTIFICATION

THERMAL SHUTDOWN AND PRETHERMAL
WARNING

DESCRIPTION

The L7200 Mozart integrates into a single chip both
spindle and VCM controllers as well as power stag-
es. The device is designed for 12V disk drive appli-
cation requiring up to 2.5A of spindle and 1.7A of
VCM peak currents. The device is based on the sinu-
soidal driving of the spindle motor. This is realized
digitally by the SMOOTHDRIVETM SYSTEM.

A serial port with up to 40 MHz capability provides
easy interface to the microprocessor. A register con-
trolled Frequency Locked Loop (FLL) allows flexibility
in setting the spindle speed. Integrated BEMF pro-
cessing, digital filter, digital masking, digital delay,
and sequencing minimize the number of external
components required.

TQFP64

ORDERING NUMBER: L7200

PRODUCT PREVIEW

MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER &

CONTROL "COMBO"

MULTIPOWER BCD TECHNOLOGY

L7200

2/23

Power On Reset (POR) circuitry is included. Upon detection of a low voltage condition, POR is asserted, the
internal registers are reset, and spindle power circuitry is tri-stated. The BEMF is rectified providing power for
actuator retraction followed by dynamic spindle braking. Three Linear regulators and a Shock Sensor circuitry
are also integrated.

The device is built in BCD mixed signal technology allowing dense digital/analog circuitry to be combined with
a high power DMOS output stage.

BLOCK DIAGRAM

C H A R G E

P U M P

S U P P L Y

FAULT

M O N I T O R S

R E F E R E N C E

VOLTAGE VCC/4

& GAIN SWITCH

14 BIT

VCM DAC

A+

A-

A=4

S U P P L Y

VBOOST

RBIAS

SYSCLK

FCOM

BRAKE

VPS

PORB

VDD

DGND

GND

ERROR_IN

ERROR_OUT

SENSE_OUT

O U T _ A

O U T _ B

R S E N S E

O U T _ C

V C M _ A +

V C C

V C M _ A -

S E N S E _ I N -

S E N S E _ I N +

V C M _ G N D

C T A P

P U M P

S D A T A

S C L K

S D E N

T R _ 1 2 V

T R _ 5 V

I S E N S E

T R _ 3 . 3 V

TR_2.5V

DAC_OUT

Regulator

2.5V

Regulator

3.3V

Regulator

V R E G 8 _ D R V

V R E G 3 . 3 _ I N

V R E G 2 . 5 _ I N

V R E G 8 _ I N

S H O C K

D E T E C T O R

SSOUT

SSIN

SSFIN

SSFOUT

SSBUFOUT

SPINDLE

Architecture

FLL &

DIGITAL

FILTER

BIPOLAR /

TRIPHASE

B E M F

D E T E C T I O N

VCM

PSM/LIN

B E M F

RECTIFICATION

VCM

CALIBRATION

THERMAL

INDUCTIVE

S E N S E

START-UP

R E - S Y N C

P W M C

I S O F E T

P W M B

P W M A

V C C

SERIAL

P O R T

R E G I S T E R S

DYNAMIC/
R E V E R S E

B R A K E

RA M P LO A DI N G

AGND

AVCC

GAINRES

DESCRIPTION (continued)

3/23

L7200

SPINDLE SMOOTHDRIVETM ARCHITECTURE, START-UP & FLL

PIN CONNECTION (Top view)

BYTE TO

PWM

CONVERTER

9bit

Resolution

FEED

FORWARD

A/D 7bit

DIGITAL

MULTIPLIER

MEMORY AND

MEMORY SCAN

BIPOLAR /

TRIPHASE

SPIN-UP

INDUCTIVE

SENSE

TORQUE

OPTIMIZER

SERIAL PORT

KFLL

FREQUENCY

MULTIPLIER

DIGITAL

FILTER

FLL

BEMF

DETECTION

6bit

8bit

9bit

10bit

12bit

10bit

12bit

Z.C.

PWM A

PWM B

PWM C

POWERS

V C M _ G N D

VCC

VPS

GND

SYSCLK

FCOM

VDD

BRAKE

ISENSE

CTAP

GAINRES

VBOOST

PUMP

SSOUT

SSFOUT

VREG8_DRV

VREG8_IN

SENSE_IN-

SENSE_IN+

SENSE_OUT

ERROR_OUT

ERROR_IN

DGND

SDEN

SDATA

SCLK

GND

VPS

VCC

V C M _ A +

V C M _ A -

O U T _ A

R S E N S E

O U T _ A

O U T _ B

O U T _ C

S S F I N

S S B U F O U T

S S I N

T R _ 2 . 5 V

T R _ 3 . 3 V

T R _ 5 V

T R _ 1 2 V

A G N D

A V C C

R B I A S

V R E G 3 . 3 _ D R V

V R E G 3 . 3 _ I N

P O R B

D A C _ O U T

V R E G 2 . 5 _ I N

V R E G 2 . 5 _ D R V

L7200

" M O Z A R T "

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

2 0

2 1

2 2

2 3

2 4

2 5

2 6

2 7

2 8

2 9

3 0

3 1

3 2

3 3

3 4

3 5

3 6

3 7

3 8

3 9

4 0

4 1

4 2

4 3

4 4

4 5

4 6

4 7

4 8

4 9

5 0

5 1

5 2

5 3

5 4

5 5

5 6

5 7

5 8

5 9

6 0

6 1

6 2

6 3

6 4

L7200

4/23

PIN FUNCTION

Pin Types: D = Digital, P = Power, A = Analog

N�

Pin Name

Description

Type

1,2

VCC

+12V Power Supply after ISOFET.

3,4

VPS

+12V Power Supply.

GND

Power Ground (substrate).

SYSCLK

Clock Frequency for system timers and counters

FCOM

Output of Spindle zero crossing or Current Sense circuit

VDD

Digital +5V Supply

BRAKE

Storage capacitor for brake circuit. Typically 5.9V

ISENSE

Input to sense the voltage of the SPINDLE Sense Resistor.

CTAP

Spindle Center Tap used for Differential BEMF sensing

GAINRES

External resistor for VCM switch gain.

VBOOST

External main Charge Pump Capacitor (typically VCC+5.8V)

PUMP

External Charge Pump

SSOUT

Shock Sensor detector Digital Output

SSFOUT

Shock Sensor detector filter Output

SSFIN

Shock Sensor detector filter Input

SSBUFOUT

Shock Sensor detector amplifier Output

SSIN

Shock Sensor detector amplifier Input

TR_2.5V

Set Point Input for 2.5V Supply monitor

TR_3.3V

Set Point Input for 3.3V Supply monitor

TR_5V

Set Point Input for 5V Supply monitor

TR_12V

Set Point Input for 12V Supply monitor

AGND

Analog Ground

AVCC

+12V analog Supply (after ISOFET)

RBIAS

External resistor for setting accurate bias current

VREG2.5_DR

2.5V positive regulator drive output

VREG2.5_IN

2.5V positive regulator sense input

VREG3.3_DRV

3.3V positive regulator drive output

VREG3.3_IN

3.3V positive regulator sense input

PORB

Power On Reset Output

DAC_OUT

Output of VCM DAC

VREG8_DRV

8V positive regulator drive output

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L7200

ABSOLUTE MAXIMUM RATINGS

VREG8_IN

8V positive regulator sense input

SENSE_IN-

Inverting Input of the Sense Amplifier

SENSE_IN+

Non inverting Input of the Sense Amplifier

SENSE_OUT

Output of the Sense Amplifier

ERROR_OUT

Output of the Error Amplifier

ERROR_IN

Inverting Input of the Error Amplifier

DGND

Digital Ground

SDEN

Serial Data Enable. Active high input pin for serial port enable

SDATA

Serial port Data input/output

SCLK

Serial Port Data Clock. Positive edge triggered clock input for serial data

GND

Power Ground (substrate).

45,46

VPS

+12V Power Supply.

47,48

VCC

+12V Power Supply after ISOFET.

49,50

VCM_A+

VCM Power Amplifier positive Output terminal.

51,52

VCM_GND

Ground for VCM power section.

53,54

VCM_A-

VCM Power Amplifier negative Output terminal.

55,56

OUT_A

Spindle DMOS half bridge Output and Input A for BEMF sensing.

57,58

RSENSE

Output Connection for the Motor Current Sense Resistor to ground.

59,60

OUT_B

Spindle DMOS half bridge Output and Input B for BEMF sensing.

61,62

RSENSE

Output Connection for the Motor Current Sense Resistor to ground.

63,64

OUT_C

Spindle DMOS half bridge Output and Input C for BEMF sensing.

Symbol

Parameter

Value

Unit

Vcc

Maximum Supply voltage

-0.5 to 14

Volts

Vdd

Maximum Logic supply

-0.5 to 6

Volts

Vin max

Maximum digital input voltage

Vdd + .3 volts

Volts

Vin min

Minimum digital input voltage

GND - .3 volts

Volts

SPINDLE

Ipeak

Spindle peak sink/source output current

2.6

Amps

VCM Ipeak

VCM peak sink/source output current

1.8

Amps

N�

Pin Name

Description

Type

PIN FUNCTION (continued)

协谢械泻褌褉芯薪薪褘泄 泻芯屑锌芯薪械薪褌: L7200

协谢械泻褌褉芯薪薪褘泄泻芯屑锌芯薪械薪褌: L7200