Datasheet TDA5345HT Datasheet (Philips)

INTEGRATED CIRCUITS

DATA SHEET

TDA5345HT

5V spindle & VCM driver combo

Preliminary specification

1999June10

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

FEATURES

•Single chip voice coil and spindle motor drivers:

•Complementary outputs (Nmos & Pmos): No step-up converter needed

•On-chip isolation switch to allow synchronous rectification at power-down

•Suited for ramp load operation

•Register based architecture: on-chip serial interface

•Temperature shut down protection

•Linear 3.3V regulator using one external NPN transistor

•Power monitor circuitrymonitoring the 5V supply

•1 axis shock sensor amplifier

•Switched capacitor regulator (-3V) using 2 external capacitors and 2 external shottky diodes

•All main internal functions can be independently put in Sleep mode

•Small low profile package: TQFP64 (1.2mm high).

Spindle motor driver:

•High efficiency drivers: 1.5Ω Max

•0.62 Amp capability, full wave (bipolar) drive

•Internal current mirrors to measure the motor curren

•Controlled fly-back pulse slopes, programmable through the serial interface

•Active fly-back pulse limitation, using the Power MOS instead of diodes

•Internal digital timing to control the commutations by back-EMF sensing (Start-up & running)

•Internal speed loop combining FLL and PLL

•Start-up current control by an internal 6-bit DAC (shared with the VCM loop).

Voice coil motor (VCM) driver:

•High efficiency drivers: 1.5Ω Max (without the external sense resistor); 0.4 Amp capability

•External sense resistor to accurately control the VCM current

•True AB Class linear amplifier with no crossover distortion

•Internal 12-bit DAC to control the VCM transconductance input voltage

•Internal 6-bit DAC to cancel the VCM loop offsets

•Active fly-back pulse limitation, using the Power transistors instead of diodes

•3-step programmable retract function activated by either the serial port or the power monitor circuitry

•Back-EMF amplifier to monitor the actuator speed when ramp loading.

Power Monitor:

•Monitors the 5V power supply

•Power fault output (battery too low); threshold=4.2V

•Power on Reset output; threshold=4.1V (Vdd5)

•Threshold accuracy:+/-3%.

1999June10 2

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

GENERAL DESCRIPTION

The TDA5345HT is a combination of a voice coil motor and a spindle motor driver, designed for 5V high performance
portable small form factor hard disk drives. Communications with the micro-controller take place through a 16-bit 3-wire
uni-directional serial port. Power dissipation is a major concern in portable drives, therefore each main function can be
individually put in sleep mode when it is not used, to save as much power as possible. The serial port and the power
monitor are the only functions which remain always active.

The TDA5345HT integrates a spindle driver and the commutation logic that drives a three-phase brushless, sensorless
DC motor in full wave mode. Commutations are generated from the internal back-EMF sensing circuitry from start-up to
the running mode. An internal speed loop combining FLL and PLL technics makes sure that the spindle reaches the right
speed, programmed through the serial port. The 6-bit DAC is used to limit the Start-up current by limiting the voltage on
the speed loop filter. To reduce acoustical noise and current noise on both power supply and ground, the fly-back pulse
leading edge slew-rate is controlled. 4 different slope values are programmable.
To prevent internal parasitic effects, positive and negative fly-back pulses are clamped by the output power transistors
themselves: lower NMOS transistors are turned ON to limit the negative fly-back pulses just below ground while upper
PMOS limit the positive fly-backs just above the power supply. This active limitation is still active at power down during
the VCM retract. In this way, an efficient back-EMF rectification is obtained (no diodes losses).

The VCM driver is a linear transconductance amplifier; it is a true AB class with a 8mA quiescent current. It means that
there is absolutely no crossover distortion. An external compensation network is used to set the loop bandwidth and
ensure the loop stability. With common VCM characteristics, the bandwidth can go up to 40kHz. To prevent internal
parasitic effects, positive and negative fly-back pulses are clamped by the output power transistors themselves.
An on-chip 12-bit DAC is used to generate the VCM amplifier input voltage. This a signed converter, with an output range
of [1.25V;1.75V] when the low gain is selected and an output range of [0.5V;2.5V] when the high gain is selected.
The all VCM transconductance works then around a 1.5V reference (available on one pin). It is possible to add an
external notch filter between the 12-bit DAC output and the VCM loop intput. An other 6-bit DAC is used to cancel the
Vcm loop offsets. An additional Vcm back-EMF amplifier is provided to monitor the actuator speed when ramp loading.
A ramp unload circuitry is included as well. It can be activated through the serial bus (SoftRetract) or automatically
initiated in case of temperature shut down or at power-down. The ramp unload sequence is made of 3 steps : brake, slow
retract and then full power. The retract steps duration is set by means of internal programmable counters, clocked by the
spindle back-EMF. In case of power down, this sequence is followed by a spindle brake. The three spindle lower power
NMOS are switched fully ON together.

The linear 3.3V DC-DC converter is designed to drive an external power NPN that will supply the 3.3V chips. It can be
enabled or disabled by hardware, using the external Reg3v3On pin.

The switched capacitor -3V regulator is designed to supply a very clean negative voltage to the PreAmp IC in the drive.

The shock sensor amplifier is intended to be connected to an external 1 axis shock sensor. The window comparator
threshold is programmable through the serial bus.

An internal circuitry provides either an analog or a digital information about the junction temperature. These two
informations can be selected through the serial bus. When the analog output is selected, the voltage is proportional to
the internal chip temperature. When the digital output is selected, it indicates that the temperature exceeds 145°C. An
internal thermal shut down mode is initiated when the temperature is higher than 160°C: the 3 spindle outputs are
disabled while the vcm is immediately retracted.

The power monitor circuitry monitors the 5V power supply. The Power On Reset PORN output is driven low when the
5V supply is below 4.1V. This threshold can be changed by an external resistor divider. Once the power supplies is
above its threshold, the Power On Reset output goes high after a delay that is set by an external capacitor. A second
output, called Power Fault (active HIGH), indicates that the 5V power supply is below 4.2V when high. There is no delay
between the supply crossing the threshold and the PowerFault output change.

1999June10 3

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

SpinCompens

SpinSpeedFilter

MechClock

CLOCK

SpinDigOut

SEN_N

SDATA
SCLK

BrakePower
RetReset

RegSense

RegNPNBase

Reg3v3PwrUp

PowerFault

PorN
PorCap

Por5Adj

Fig.1

Speed Loop

(FLL/PLL)

(digital)

commutation

manager

(digital)

Serial

interface

(digital)

3.3V

Regulator

reference
generator

Power On Reset

Thermal

monitor

TempMux

Charge
Pumps

Start-Up

current

limiter

6-bit

DAC

12-bit

DAC

3-step

Retract

& spindle

brake

Shock
sensor

amplifier

Bemf
Comp

SpinCenterTap

SpinMotA

Spindle
drivers

SpinMotB

SpinMotC

Power stage

VcmCompensIn

+

+

VcmDacOut

VcmInput

VcmCompensOut

Vcm

VcmMinus
AB class
drivers

VcmPlus

Power stage

VcmBemf

Vcm
back-EMF
Amplifier

OpAmpInM
OpAmpOut

Vcm

Current sense

Amplifier

Negative

supply

VcmSenseInM

VcmSenseInP

Neg3V
PumpNeg3V

regulator

ShockInput

ShockFiltOut

ShockCompOutShockFiltOut

GENERAL BLOCK DIAGRAM

1999June10 4

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

PINNING (GREY ROWS MEANS NEW PINS))

SYMBOL PIN # DESCRIPTION I/O

SpinVddA 1 spindle MotA half bridge power supply I
SpinRectBemf 2 spindle “Clamp”: rectified Bemf O
SpinMotA 3 spindle power output: A O
VcmVddM 4 VCM- half bridge power supply SUPPLY
SpinGndAB 5 spindle MotA & MotB half bridges ground GROUND
VcmMinus 6 VCM inverted power output (VCM-) O
n.c.1 7 not connected ; connect it to ground GROUND
SpinMotB 8 spindle power output: B O
VcmGndPow 9 VCM H-bridge ground GROUND
SpinVddBC 10 spindle MotC & MotB half bridges power supply I
VcmPlus 11 VCM non-inverted power output O
n.c.2 12 not connected; connect it to ground GROUND
SpinMotC 13 spindle power output: C O
VcmVddP 14 VCM+ half bridge power supply SUPPLY
SpinGndC 15 spindle MotC half bridge ground GROUND
GNDAna1 16 analog ground GROUND

VcmCompensOut 17 VCM error amplifier output O

VcmRef 18 VCM loop reference voltage (1.5V) O
VcmCompensIn 19 VCM error amplifier inverted input I
VcmInput 20 VCM loop input I
VcmVdd5Div2 21 internal Vdd5/2 reference voltage for the VCM I/O
VcmSenseInM 22 VCM sense amplifier inverted input I
VcmSenseInP 23 VCM sense amplifier non-inverted input I
Vdd5Ana1 24 analog power supply SUPPLY
PorN 25 power On Reset output O
PorCap 26 external capacitor used to set the Power On Reset delay O
BdGap 27 internal band-gap reference voltage (for production trimming) I
Por5Adj 28 5V power on reset threshold adjustment I
VcmBemf 29 VCM Back-Emf amplifier output O
OpAmpInM 30 VCM Back Emf Operational Amplifier inverted input I
OpAmpOut 31 VCM Back Emf Operational Amplifier output O
GNDAna2 32 analog ground GROUND
RefCurRes 33 external 33kΩ resistor O
Reg3v3PwrUp 34 hardware enable / disable for the 3.3V regulator (at Power Up) I
PumpNeg3V 35 -3V regulator pump capacitor O
Neg3V 36 -3V regulator output sense pin I
PowerFault 37 battery low warning O
CLOCK 38 digital timing clock I
SDATA 39 serial port Data line I
Vdd5Dig 40 digital power supply SUPPLY

1999June10 5

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

SYMBOL PIN # DESCRIPTION I/O

SCLK 41 serial port Clock I
SEN_N 42 serial port ENABLE line: active low I
SpinMechClock 43 spindle rotation speed (1 pulse / revolution) O
SpinDigOut 44 spindle back-EMF comparator output or commutation clock O
RetReset 45 external capacitor used to reset the retract sequence state machine I
RegNPNBase 46 3v3 DC-DC converter output (drives an external NPN) O
RegSense 47 3v3 DC-DC converter input I
GndDig 48 digital ground GROUND
VcmDacOut 49 12-bit VCM DAC output O
ShockRef 50 shock sensor reference voltage O
ShockFiltOut 51 shock sensor RC low pass filter output O
ShockCompOut 52 shock sensor comparator output O
ShockCom 53 shock sensor input common mode I
ShockAmpOut 54 shock sensor amplifier output O
ShockInput 55 shock sensor input I
Vdd5Ana2 56 analog power supply SUPPLY
TempMux 57 internal thermal monitor circuitry voltage output O
SpinSpeedFilter 58 external FLL/PLL speed loop filter O
SpinCompens 59 spindle current loop compensation capacitor O
BrakePower 60 external capacitor to supply the spindle brake at power down I
SpinCenterTap 61 spindle centre tap connection I
RetPmosDrain 62 retract Pmos transistor drain connection O
IsoSwSo 63 spindle power outputs supply SUPPLY
GNDAna3 64 analog ground GROUND

1999June10 6

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

GNDANA3

ISOSWSO

PMRETDRAIN

SPINCENTERTAP

BRAKEPOWER

SPINCOMPENS

SPINSPEEDFILTER

TEMPMUX

VDD5ANA2

SHOCKINPUT

SHOCKAMPOUT

SHOCKCOM

SHOCKCOMPOUT

SHOCKFILTOUT

SHOCKREF

VCMDACOUT

646362616059585756555453525150

49

SPINVDDA

SPINRECTBEMF

SPINMOTA
VCMVDDM

SPINGNDAB

VCMMINUS

n.c.1

SPINMOTB

VCMGNDPOW

SPINVDDBC

VCMPLUS

n.c.2

SPINMOTC

VCMVDDP

SPINGNDC

GNDANA1

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

171819202122232425262728293031

VCMREF

VCMINPUT

VCMCOMPENSIN

VCMCOMPENSOUT

TDA5345HT

VCMVDD5DIV2

VCMSENSELNP

VCMSENSELNM

PORN

VDD5ANA1

PORCAP

BDCAP

POR5ADJ

VCMBEMF

OPAMPLNM

OPAMPOUT

48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33

32

FCK121

GNDANA2

GNDDIG
REGSENSE
REGNPNBASE
RETRESET
SPINDIGOUT
SPINMECHCLOCK
SEN_N
SCLK
VDD5DIG
SDATA
CLOCK
POWERFAULT
NEG3V
PUMPNEG3V
REG3v3PWRUP
REFCURRES

Fig.3 Pin configuration

1999June10 7

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Vdd5

Current
mirror

I

spindle

530

R

SpinLoopGain

I

spindle

530

PorN

25

OTA

+

On/Off

On/Off

1

On/Off

1

530

530

63

IsoSwSo

SpinRectBemf

2

1

SpinVddA

3

SpinGndAB

5

10

SpinVddBC

8

VDD

SpinMotA

SpinMotB

58

SpinSpeedFilter

voltage
limiter

(ext.)

(ext.)

SpinDigOut

FLL/PLL
CHARGE
PUMPS

6-bit DAC

33

RefCurRes

59

SpinCompens

44

On/Off

On/Off

1

On/Off

+

Fig.4 Spindle section diagram.

530

(ext.)

SpinMotC

13

SpinGndC

15

61

SpinCenterTap

1999June10 8

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

(ext.)

1719

SpinRectBemf

VcmCompenIn

20

VcmInput

49

6-bit
DAC

(current)

12-bit

VcmCompensOut

+ 2.5

-2.5

2

VcmVddP

4

6

9

VcmGnd

11

VcmVddM

VcmMinus

(ext.)

14

VCM

VcmPlus

R

sense

VcmDacOut

DAC

(voltage)

VcmRef

18

Fig.5 VCM section diagram.

1999June10 9

1

1.5V

1

26KΩ

VcmVdd5Div2

(ext.)

VDD

26KΩ

21

22

VcmSenseInM

3

23

VcmSenseInP

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

FUNCTIONAL DESCRIPTION
Serial interface

The serial interface is a uni-directional port for writing data to the internal registers of TDA5345HT. Each write is
composed of 16 bits. For data transfer SEN_N is brought low, serial data is presented at SDATA pin, and a serial clock
is applied to the SCLK pin. After the SEN_N pin goes low, the first 16 pulses applied to the SCLK pin shifts the data
presented at the SDATA pin into an internal shift register on the rising edge of each clock. An internal counter prevents
more than 16 bits from being shifted into the register. The data in the shift register is latched when SEN_N goes high. If
less than 16 clock pulses are provided before SEN_N goes high, the data transfer is aborted.

All transfers are shifted into the serial port MSB first. The first 4 bits of the transfer determine the internal register to be
accessed. The other 12 bits contain the programming data. During sleep modes, the serial port remains active and
register programming data is retained.

SEN_N

Address

Receive data

T

st

T

su

T

hd

SCLK

12

456789

3

10

11

12

13 14 15 16

SDATA A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Write to TDA5345HT

Fig.6 Serial port timing information.

Table 1 Address of registers

A3 A2 A1 A0 REG. DESCRIPTION

00000clock dividers programmation, spindle mode control
00011start-up,comdelim & watch-dog delays
00102blank delay, bandgap adjust, 3-step retract param (begin)
001133-step retract parameters (end)
01004fly-back slope, shock sensor threshold & sleep control bits
01015speed factor (MSBs), PLL control and 6-bit DAC
01106speed factor(LSBs)
01117Vcm 12-bit DAC (low gain)
10008Vcm 12-bit DAC (high gain)
1 0 0 1 9 shock sensor threshold

T

ex

1999June10 10

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Table 2 Serial Interface REGISTERS floorplan

BIT\

REG

0 RegNeg

1 StartUp

2 Blank

3 T_Full

4 FlyBack

5 Speed

6 Speed

7 Dac12a

8 Dac12b

9 Shock

11109876543210

Clk2

Delay3

Delay3

Power2

Slope1

bit14

bit11

bit11

bit11

RegNeg

[0]

StartUp

Delay2

Delay2

Power1

FlyBack

Slope0

Dac12a

Dac12b

Thresh2

Clk1

[1]

Blank

T_Full

Speed

bit13

Speed

bit10

bit10

bit10

[0]

RegNeg

Clk0

[0]

StartUp

Delay1

Blank

Delay1

T_Full

Power0

Shock

Thresh1

Speed

bit12

Speed

bit9

Dac12a

bit9

Dac12b

bit9

Presc

Factor1

[0]

StartUp

Delay0

Blank

Delay0

T_Slow

Ret5

Shock

Thresh0

PllCur1PllCur0Dac6

Speed

bit8

Dac12a

bit8

Dac12b

bit8

Presc

Factor0

[0]

ComDe

Lim3

DigOut

Mux

[1]

T_Slow

Ret4

Vcm

Retract

[0]

Speed

bit7

Dac12a

bit7

Dac12b

bit7

BiasCT

ComDe

Lim2

BdGap

Adj2

T_Slow

Ret3
Vcm

Sleep

ToVCM

Speed

bit6

Dac12a

bit6

Dac12b

bit6

[0]

[0]

[1]

[0]

Run/
Stop

[0]

ComDe

Lim1

BdGap

Adj1

[0]

T_Slow

Ret2

Dac12

Sleep

[1]

Dac6

bit5

Speed

bit5

Dac12a

bit5

Dac12b

bit5

Pll

Enable

[0]

ComDe

Lim0

BdGAp

Adj0

[0]

T_Slow

Ret1

RegNeg

Sleep

[1]

Dac6

bit4

Speed

bit4

Dac12a

bit4

Dac12b

bit4

Manual

[0]

Watch

Dog3

VcmRet

SoftRis

T_Slow

Ret0

Shock

Sleep

[1]

Dac6

bit3

Speed

bit3

Dac12a

bit3

Dac12b

bit3

Man

Com2

Watch

Dog2

Vretract2Vretract1Vretract

T_Vcm
Brake2

Spin

Sleep

[1]

Dac6

bit2

Speed

bit2

Dac12a

bit

Dac12b

bit2

Man

Com1

Watch

Dog1

T_Vcm
Brake1

Reg3v3

Enable

[0]

Dac6

bit1

Speed

bit1

Dac12a

bit1

Dac12b

bit1

Man

Com0

Watch

Dog0

0

T_Vcm
Brake0

Temp

Select

[0]

Dac6

bit0

Speed

bit0

Dac12a

bit0

Dac12b

bit0

Note:

1.[1] (or [0]) means that the bit is set to 1 (or 0) when PorN is low => default value at power up.

2.Use register 7 (Dac12a) for low VCM loop gain and register 8 (Dac12b) for high gain.

Control bits:

REGISTER#0:
Bits [11,9] (RegNegClk[2,0]):The Negative supply (-3V) regulator needs a 500kHz clock. A programmable divider

genreates this frequency from the external clock ([15-33] Mhz). Programmation is on 3 bits.

Bits [8,7] (PrescFactor[1,0]):used to select the prescaler division factor (see next section: “commutation control”).
Bit 6 (BiasCT):used to bias the spindle centre tap at Vdd5/2 when the spindle outputs are disabled (Run/Stop = 0). The

back-EMF comparator remains operational when BiasCT = 1, to check if the spindle is running for instance.
Bit 5 (Run/Stop):after the power supply is turned on and PorN is high, the motor will start spinning when Run/Stop is

set to ‘1’. The spindle power output starts from state code 0 (see table 3). The motor will stop when this bit is set to ‘0’.
The 3 spindle power outputs are then switched off. No brake is applied.

bit 4 (PllEnable):enables the PLL to improve the speed accuracy.
Bit 3 (Manual):selects the manual commutation mode (Run/Stop bit also needs to be high). When getting out of the

manual mode (=> Manual = ‘0’) and keeping the Run/Stop bit high, the internal commutation block will start from the last
state programmed in manual mode.

Bits [2,0] (ManCom[2,0]):control the commutation in manual mode when Run/Stop = 1 & Manual = 1.

1999June10 11

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Table 3 Spindle power output states according to ManCom0, ManCom1, ManCom2 bit values.

MANCOM[2] MANCOM[1] MANCOM[0] SPINMOT A SPINMOT B SPINMOT C STATE CODE

0 0 0 low high float 0
0 0 1 low float high 1
0 1 1 float low high 2
1 1 1 high low float 3
1 1 0 high float low 4
1 0 0 float high low 5
1 0 1 low low low 6 (brake)
0 1 0 high low high 7 (tripolar)

REGISTER#1

bit [11,8] (StartUp[3,0]):programmable delay used to detect if the spindle is standing still at start-up.
bit [7,4] (ComDeLim[3,0]):Used to set a default value for the spindle commutation delay.
bit [3,0] (WatchDog[3;0]):programmable delay used to detect if the spindle is running backward at star-up.

REGISTER#2

bit [11,8] (BlankDelay[3,0]):programmable delay used to blank the first edge of the spindle inductive fly-backs.
bit 7 (DigOutMux):SpinDigOut pin is the commutation clock when DigOutMux = ‘1’ else back-EMF comparator output.
bit [6,4] (BdGapAdj[2,0]):used to adjust the internal BandGap reference voltage to improve several parameters.
bit 3 (VcmRetSoftRising):Enables the digital soft rising slope on the “full power retract” step.
bit [2,0] (Vretract[2;0]):used to program the VcmMinus output voltage during the “soft retract” step.

REGISTER#3

bit [11,9] (T_FullPower[2,0]):used to program how much time the full power retract step is applied.
bit [8,3] (T_SlowRetract[5,0]):used to program how much time the slow retract step is applied.
bit [2,0] (T_VcmBrake[2,0]):used to program how much time the VCM brake step is applied.

R

EGISTER#4

bit [11,10] (FlyBackSlope[1,0]):used to program the fly-back pulse leading edge slew rate.
bit [9,8] (ShockThresh[1,0]):set the shock sensor threshold value.
bit 7 (VcmRetract):activates a VCM retract when VcmRetract = ‘1’.
bit 6 (VcmSleep):puts the VCM section (except the VCM sense amplifier and the VCM 12-bit DAC) in sleep mode when

VcmSleep = ‘1’.

bit 5 (DAC12Sleep):puts the VCM 12-bit DAC & the VCM sense amplifier in sleep mode when Dac12Sleep = ‘1’.
bit 4 (RegNegSleep):puts the -3V regulator in sleep mode whenRegNegSleep = ‘1’.
bit 3 (ShockSleep):puts the Shock sensor section in sleep mode when ShockSleep = ‘1’.
bit 2 (SpinSleep):puts the Spindle section in sleep mode when SpinSleep = ‘1’ ; SpinMotA, B, C are floating then.
bit 1 (Reg3v3Enable):Enables the internal 3.3V regulator when bit 1= ‘1’.

1999June10 12

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

bit 0 (TempSelect):selects whether the TempMux pin is a digital output (temperature-high warning) when
TempSelect = ‘0’ or an analog output (temperature monitor) when TempSelect = ‘1’.

REGISTER#5

bit [11,9] (Speed[14,12]):division factor used to set the spindle speed controlled by onboard FLL/PLL (2 MSBs only).
bit [8,7] (PllCur[0,1]):Programmable current for the PLL charge pump.
bit 6 (Dac6ToVcm):6-bit DAC is connected to the VCM section when Dac6ToVcm = ‘1’, else connected to the spindle.
bit [5,0] (Dac6[5,0]):6-bit word converted to a current by the 6-bit DAC.

REGISTER#6
bit [11,0] (Speed[11,0]):division factor used to set the spindle speed controlled by onboard FLL/PLL (12 LSBs only).

REGISTER#7
bit [11,0] (Dac12a[11,0]):12-bit word sent to the VCM 12-bit DAC. Low gain selected for the VCM loop.

REGISTER#8
bit [11,0] (Dac12b[11,0]):12-bit word sent to the VCM 12-bit DAC. High gain selected for the VCM loop.
REGISTER#9

bit [10] (Shock thresh[23):set the shnock sensor threshold value.

1999June10 13

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Commutation control

DELAYS
The spindle block contains both the low-side and high-side drivers configured as a H bridge for a three phase DC

brushless, sensorless motor. In each of the six possible states, two outputs are active, one sourcing current and one
sinking current. The third output presents a high impedance to the motor which enables measurement of the BEMF in
the corresponding motor coil. The back-EMF comparator output (available on pin SpinDigOut) is processed by the
commutation logic circuit to calculate the correct time for the next commutation, which will change the output state.

The commutation block measures then the time between 2 consecutive zero-crossings and determines the actual
commutation time and the next motor coils state. All the following situations must be taken into account:
=> Start up, No start, Backwards spin, Run and Manual commutation.

The commutation logic keeps the motor spinning by commutating the motor each time a zero-crossing is detected. The
delay between the zero-crossing and the actual output driver change is either internally calculated or programmable via
the serial port (useful at start-up: no delay has been measured!).

The internal commutation clock can be monitored on pin SpinDigOut (44). The falling edges are the relevant
informations: they are caused by the zero-crossings. If preferred, SpinDigOut can be set to become the back-EMF
comparator output, to check if the spindle is already spinning at power up for instance. If the spindle outputs are floating,
don’t forget to bias them, using the “BiasCT” bit, before considering the BemfCompOut value.
Fig.6 and Fig.7 show typical motor commutation timing diagrams.

State Code

SpinMotA

SpinMotB

SpinMotC

Commutation
Clock

BemfCompOut

0

L

H

F

Zero-crossing

1

L

F

HH

234

F

LL

Fig.7 Input commutations to output drivers

HH

F

F

L

5

F

H

L

1999June10 14

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

SpinMotA

SpinMotB

SpinMotC

ZOOM

Blank1

WatchDog

Blank2

StartUp

Commutation

delay

CENTER TAP

Commutation

Zc

1

fly-back pulse

The digital control block ignores any crossing while theBlank1 timer is counting. This means that the zero-crossing
caused by the fly-back pulse leading edge (ZC1) is not seen by the commutation block.

TheWatchDog timer makes sure that the motor is running forward. If the motor is going backwards, the BEMF voltage
will be inverted and the second crossing (ZC2) of the inductive pulse will not occur until the actual BEMF zero crossing.
Therefore, if the WatchDog timer expires before a zero-crossing occurs, the motor is assumed to be turning backwards.
The commutation is advanced one step to correct this condition. The second inductive zero-cross (ZC2) must occur within
the WatchDog time. Therefore, the WatchDog must be set to a time that is greater than the fly-back pulse duration
measured when the motor is standing still.

Zc

2

false zero crossings

Zc

3

Fig.8 A typical motor commutation diagram

true zero crossing

Commutation

TheBlank2 timer starts counting as soon as the second zero-cross (ZC2) occurs. After the second inductive
zero-crossing all extra zero-crossings are ignored during the Blank2 time. This allows the coil voltage to ring slightly
without causing a commutation advance.To make the chip smaller, Blank1 and Blank2 have the same value: Blank.

If the motor is not spinning, no BEMF zero-crossing will occur. TheStartUp timer detects this if it expires before the true
zero-crossing (ZC3) has occurred. It will advance the commutation one step if this happens.

The Commutation Delay Limiter (ComDeLim) allows to control the maximum commutation delay time. This commutation
delay time is equal to half the measured delay between 2 zero crossings(∆Zc

1999June10 15

measured

). ComDeLim value should be

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

programmed to be the
If∆Zc
If∆Zc

measured
measured

is lower than ComDeLim, the next commutation delay will be∆Zc
is higher than ComDeLim, the next commutation delay will be ComDeLim value divided by 2.

maximum allowable delay value

.

measured

divided by 2.

ComDeLim can be limited to guarantee a faster lock after the motor has gone out of lock.
The clock used in the commutation control block is obtained by dividing the master clock of the chip (CLOCK: pin #38)

by a clock divider (PRESCALER). This internal clock is named ClockOutPrescaler.
All the delays described above (Blank, WatchDog and StartUp) are generated by a down-counter (called TIMER1). The
time between two zero-crossings is measured by a second counter called TIMER2. The commutation delay and the
ComDeLim are derived from TIMER2. Both counters are clocked on ClockOutPrescaler clock, which is programmable
through the serial interface, using bit 7 & 8 of register #0: (ClockOutPrescaler should be chosen as typically 1MHz)

Table 4 Clock configurations

PRESCFACTOR1

(BIT 8, REG#0)

0 0 CLOCK/4
0 1 CLOCK/8
1 0 CLOCK/16
1 1 CLOCK/32

TIMER1

PRESCFACTOR0

(BIT 7, REG#0)

CLOCKOUTPRESCALER

Timer 1 isused to generate Blank, WatchDog andStartUp delays: It loads one of these programmed values and counts
down till it reaches zero. All LSB bits are internally set to ‘1’: bits [2:0] for Blank, bits [8:0] for WatchDog, bits [13:0] for
StartUp.

WatchDogStartUp

Blank

Fig.9 Timer 1 configuration.

Calculations:
The actual delay will be: Delay = (Value * Step) + min, where:

Value = the decimal value programmed in the considered register
Step size = 2
Min = (2

maximum = (2

LSB

/

ClockOutPrescaler

LSB

-1) /

ClockOutPrescaler

(MSB+1)

-1) /

(bits from 0 to (LSB-1) are internally set to 1)

ClockOutPrescaler

01234567891011121314151617

1999June10 16

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Table 5 Numeral application with CLOCK = 16 MHz

DELAYS

CLOCKOUTPRESCALER=

CLOCK/4 = 4 MHZ

CLOCKOUTPRESCALER=

CLOCK/8 = 2 MHZ

CLOCKOUTPRESCALER=

CLOCK/16 = 1 MHZ

CLOCKOUTPRESCALER=
CLOCK/32

= 0.5 MHZ

MIN STEP MAX MIN STEP MAX MIN STEP MAX MIN STEP MAX

Blank 3µs4µs63µs7µs8µs 127µs 15µs 16µs 255µs31µs32µs511µs

WatchDog 127µs 128µs 2.05ms255µs 256µs 4.0ms

StartUp 4.1ms 65.5ms65.5ms 8.2ms 8.2ms 131ms

511µs 512µs 8.2ms1023µs1024µs16.4ms

16.4ms 16.4ms 262ms32.8ms32.8ms524ms

TIMER2
TIMER2 is used to measure the delay between two zero-crossings and also to set the maximum commutation delay

through comdelim delay:

01234567891011

ComDeLim

Explanation: COMDELIM is the maximum value that can be reached by TIMER 2. So, this is the maximum delay

between 2 zero-crossings

Calculations:
Delay between 2 zero-crossings (∆Zc):

step size = 2
min = (2
maximum = (2

. The maximum commutation delay is then

LSB

/

ClockOutPrescaler

LSB

-1) /

(MSB+1)

ClockOutPrescaler

- 1) /

ClockOutPrescaler

Fig.10 Timer 2 configuration.

half this value!

(bits from 0 to (LSB-1) are internally set to 1)

Maximum commutation delay:

step size = 2
maximum = (2

(LSB-1)

(MSB)

/

ClockOutPrescaler

- 1) /

ClockOutPrescaler

Table 6 Numeral application with CLOCK = 16MHz

DELAYS

CLOCKOUTPRESCALER=

CLOCK/4 = 4 MHZ

CLOCKOUTPRESCALER=

CLOCK/8 = 2 MHZ

MIN STEP MAX MIN STEP MAX MIN STEP MAX MIN STEP MAX

∆ Z

C

ComDeLim 31µs32µs 511ms 63µs64µs 1.02ms

63µs64µs 1.02ms127µs 128µs 2.05µs 255µs 256µs 4.1ms 511µs 512µs 8.2ms

1999June10 17

CLOCKOUTPRESCALER=

CLOCK/16 = 1MHZ

127µs 128µs 2.05ms255µs 256µs 4.1ms

CLOCKOUTPRESCALER=

CLOCK/32 = 0.5MHZ

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Spindle current loop

The spindle current I

is sensed by internal current mirrors and copied to an internal resistor R

Spin

SpinLoopGain

. The current
loop input is controlled by the internal FLL/PLL speed loop. The transconductance is defined by the following formula
(see Fig.3) :

∆I

G

A()V()⁄[]

Spin

--------------------------------------------­∆V

Spin

SpinSpeedFilter

530

-----------------------------------­R

SpinLoopGain

530

-----------------­1700Ω

312mAV⁄====

(1)

The spindle current loop bandwidth is given by the following formula : (gm means transconductance : di/dv)

R

SpinLoopGain

× gm

-----------------------------------­530

2π⋅ C×

NMOS

SpinCompens

are : gm

×

= 50µA/V & gm

OTA

NMOS

65.510

⋅

NMOS

6–

×==

I

Spin

-----------------------------------­C

SpinCompens

= 2.62 x Sqrt(I

Spin

(2)

)A/V

BW

SpinCurLoop

where the typical values for gm
BW

SpinCurLoop

should be kept <= 20kHz, whatever the current. Take care of the fact that the higher the current, the higher

gm

OTA

--------------------------------------------------------------------------------------------

and gm

OTA

the BandWidth => the bandwidth is maximum at Start-Up.
To make sure that the OTA output is 0V when Run/Stop bit = ‘0’, a 30mV (typ.) offset is introduced inside the OTA. By

this way, we make sure that SpinCompens external capacitor is kept discharged until the next start-up.

Spindle FLL/PLL speed loop :

An internal speed loop is provided, intended to work with12 polesspindle motors. It is mainly composed of a Frequency
Locked Loop. A Phase Locked Loop can be associated when bit 9 in register #5 (PllOn/Off) is ‘1’. The typical FLL charge
pump current is 500µA while the typical PLL charge pump current is given in table 7 :

Table 7 PLL charge pump typical current (PllCur[1,0] are bits 8 & 7 in register #5):

PLLCUR[1,0] PLL CH. PUMP CURRENT

00 0.25µA
01 0.5µA
10 0.75µA

11 1µA

A 15-bit division factor (Speed[14,0]) is used to set the required speed split in bits [11,9] in register #5 and bits [11,0]
in register #6:

The Speed[14,0] division factor can be calculated by :

Speed140,[]

5

×=

--­3

CLOCK

------------------------------------------------------------­SpindleSpeedrpm()

(3)

Where CLOCK is between 10MHz and 33MHz.
When the spindle is not running (Run/Stop = ‘0’) the FLL charge pump discharge current is active so that the external

filter is discharged before the next start-up. When the spindle is running (Run/Stop = ‘1’), the speed can be continuously
monitored on pin SpinMechClock (1 pulse per revolution / 50% duty cycle waveform).

SPINDLE / VCM 6-bit current DAC:

An internal 6-bit current DAC is used to limit the spindle start-up current (bit 6 in register #5 : Dac6ToVcm = ‘0’) or to
cancel the VCM loop offset ( Dac6ToVcm = ‘1’).

1999June10 18

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

When the 6-bit DAC is used for the spindle, the LSB current is set externally, by means of a 33kΩ resistor (to have a
very good absolute accuracy). The Spindle Current limit is then set by 31 steps of 20mA. Please note that only the
positive codes of the 6-bit DAC can be used, so only (25 - 1) = 31 steps can be defined.

Table 8 Spindle Start-up current limit according to the spindle 6-bit DAC code :

INPUT CODE SPINDLE START-UP CURRENT

000000 0mA
000001 20mA

011111 620mA

When the 6-bit DAC is used for the VCM section, the LSB current is set by an internal resitor to have a good matching
with the 2 internal resistors used to set the VCM loop Gain. The VCM current offset is set by steps of :

I

VCMOffsetLSB()

1.613103–⋅

------------------------------­R

Sense

Table 9 VCM current offset according to the spindle 6-bit DAC code (assuming that R

A()=

= 1Ω, 1LSB = 1.613mA) :

Sense

(4)

INPUT CODE VCM OFFSET CURRENT

011111 +50mA
000000 0µA
1111111 -1.613mA
100001 -50mA
100000 -50mA

VCM driver

The VCM is a linear, AB class type with both low-side and high-side drivers configured as a H-bridge. The zero-current
reference voltage for the VCM loop is internally set at Vdd5/2=2.5V. The sense resistor R

enables the VCM current

sense

to be measured through the sense amplifier. The gain of the sense amplifier is internally set to typically 3. The output
VcmSenseOut is given by the following equation:

VcmSenseOut 3 VcmSenseInPVcmSenseInM–()VcmRef+×=

(5)

Figure 14 presents the VCM sense amplifier.

VcmRef

18

I

VCM

3R

R = 10 kΩ

23

VcmSenseInP

R

+

Rsense

VcmSenseInM

22

R

Fig.11 VCM sense amplifier

1999June10 19

-

3R

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

The error amplifier compares the VcmDacOut(49) input command and the VcmSenseOut(18) sense amplifier output
signal to generate the control voltage of the power drivers.

I

VcmSenseInP

VcmSenseInM

VCM

23

+

SENSE

22

AMPLIFIER

G=3

-

R

in

sense

R

VcmDacOutVcmRef–

-----------------------------------------------------------------

R

VcmCompensIn

Fig.12 VCM transconductance gain schematic.

VcmSenseOutVcmRef–

-------------------------------------------------------------------------

FB

R

FB

VcmRef

18

19

+

ERROR

AMP

-

3R

× I

==

----------------------------------------------

VcmCompensOut

R

in

×

sense

VCM

R

FB

17

VcmInput

to the power

drivers

20

(6)

Finally, the transconductance gain of the VCM loop is given by the following equation:

G

A()V()⁄[]

VCM

I

----------------------------------------------------------------­VcmDacOutVcmRef–

VCM

R

---------­R

FB

in

×

--------------------------­3R

×

1

sense

0.4

===

----------------­R

sense

(7)

VCM 12-bit resistive ladder DAC:

The VCM loop input voltage is provided by an internal signed 12-bit resistive ladder DAC. The output voltage is a linear
function of the input code written in register #7 (low gain) or register #8 (high gain), bits [11:0] :

Table 10Dac12 output voltage versus the input code (1 LSB=125µV) when writing in register #7 :

INPUT CODE DAC12 VOLTAGE

(7FF)
(000)

(FFF)

(800)

H
H

H

H

1.732V-1LSB

1.482V

1.482V-1LSB

1.232V

Table 11Dac12 output voltage versus the input code (1 LSB = 500µV) when writing in register #8 :

INPUT CODE DAC12 VOLTAGE

(7FF)

(000)

(FFF)

(800)

H
H

H

H

2.482V-1LSB

1.482V

1.482V-1LSB

0.482V

Warning : at power up, the 12-bit DAC needs to be programmed so that it is in a defined state.
VCM back-EMF amplifier

To prevent any actuator crash on the disk when a ramp load is used, an internal VCM back-EMF amplifier is build to
monitor the actuator speed. Indeed, the VCM back-EMF is a picture of the actuator speed. The voltage across the VCM
motor is divided in several contributions:

1999June10 20

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Act+

L

dI

----------------

VCM

dt

VCM

e++=

+

I

I

VCM

If the VCM current I

Figure 14 presents the VCM back-EMF amplifier as it is implemented in the TDA5345HT:

VcmMinus

VCM

Act-

V

VCM

can be considered as constant, the back-EMF becomes:

VCM

Act+

V

VCM

R2

(6)

(ext.)

(30)

<=>

VCM

R

VCMIVCM

eV

(ext.)

R

VCM

Fig.13 VCM motor model

×()L

VCM

R

VCMIVCM




VCM

×()–=

×

R1

OpAmpOut

(ext.)

Rsense

OpAmpInM

(31)

2RR

VCM

back-EMF

e

+

R = 10 kΩ

Act-

(8)

(9)

I

(ext.)

VCM

(22)

VcmSenseInM

VCM

VcmPlus

(11)

Fig.14 VCM back-EMF amplifier

The first operational amplifier output voltage (OpAmpOut) is:

OpAmpOut VcmSenseInM

The VCM back-EMF amplifier output voltage (VcmBemf) is:

VcmBemf 2 VcmPlusOpAmpOut–()× VcmRef+=



VcmBemf 2 VcmPlus VcmSenseInM

–× VcmRef+=



VcmBemf

R

(29)

2R

(18)

R1



–=

R

--------



R2

R1

R

-------­R2

VcmRef=1.482V

××

SenseIVCM

××〈〉–

SenseIVCM

(10)

(11)

(12)

1999June10 21

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

R1



+–

R

--------



R2

××

SenseIVCM

(13)

Where:

VcmBemf 2 V( cmPlusVcmSenseInM)



× VcmRef+=



V

VCM

VcmPlusVcmSenseInM–()–=

(14)

and if you set:

R1

R

× R

--------

Sense

R2

=

VCM

(15)

you get:

VcmBemf 2– V

VcmBemf 2– e×= VcmRef+

VCMRVCMIVCM

×–()×= VcmRef+

(16)

(17)

VCM ramp unload sequence :

The VCM ramp unload sequence can be ordered by either the serial interface or by internal emergency procedures:
power down or temperature shut down.It will not start if VcmSleep bit is ‘1’, because the actuator is supposed to be
on the ramp already.

Three different states are programmable : first a VCM brake, second a VCM slow retract and then a VCM full power
retract.

In all cases, the spindle isolation switch is cut off. If the power transistors are still supplied, the VCM current will come
from the power supply, through the isolation switch parasitic diode. If the power transistors are no more supplied, the
VCM current will come from the spindle itself. It is used as a generator, thanks to its back-EMF.

When the sequence is initiated by a Power down detection, PorN signal will not go up until the end of the sequence.
Figure 14 shows the link created between the spindle and the VCM power structures to transfer the spindle energy to

the actuator :

1999June10 22

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

63

62

(ext.)

Isolation switch, used in reverse mode

VDD=5V

(ext.)

1

PA

MotA

NA

(ext.)

Fig.15 Power transistors structure during a retract phase

During the VCM brake, VCM power transistors N- & N+ are switched fully On while transistors P- & P+ are switched off.
During the soft retract step, N- transistor is switched off while the retract PMOS brings some current to the VCM. The
control loop is drawn in figure 14 (the voltage on VcmMinus is regulated).

SpinRectBemf

2

PB

NB

5

10

PC

MotB

NC

15

(ext.)

PA (resp. PB, PC) is switched On

NA (resp. NB, NC) is switched On

Retract PMOS

4

Off

MotC

P-

Off

N-

GND=0V

The back-EMF is synchronously rectified
by the spindle power transistors:

when MotA (resp. MotB, MotC) is aboveSpinRectBemf

when MotA (resp. MotB, MotC) is belowGND

Vcm-

Vcm+

9

VCM

Rsense

14

Off

P+

On

N+

(ext.)

VcmMinus

(6)

Fig.16 VCM retract circuitry

Rsense

(ext.)

RetPmosDrain

(62)

Programmable

VCM

voltage divider

(11)

On

1999June10 23

VcmPlus

SpinRectBemf

Internal voltage reference
=> 125 mV in slow retract
=> 250mV in full power.

(2)

Retract PMOS

retract amplifier

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Table 12VcmMinus voltage during the slow retract step versus Vretract[2:0] programming (bits [2:0] in register #2):

VRETRACT[2:0] VCMMINUS VOLTAGE

111 1V

... ...

001 250mV
000 125mV

In full power mode, VcmMinus voltage is limited to 2.8V. When the spindle back-EMF is used as a supply (power down)
the voltage will not be so high. The loop is working in saturation mode and the retract PMOS is fully saturated.

It is possible to have a kind of “soft rising” slope on VcmMinus voltage when switching from the slow retract state
(VcmMinus voltage is small) to the full power state (VcmMinus voltage is high). An internal digital counter generates
some steps (250mV high) from V

VcmMinus

During all the VCM ramp unload sequence, a programmable state machine is activated, clocked by the spindle
back-EMF on SpinMotA.

(SlowRetract) to V

VcmMinus

(FullPower) when VcmRetSoftRis = ‘1’ (bit 3, reg #2).

If T

is the spindle back-EMF period, the steps duration will vary according to the following table:

bEMF

Table 13Brake duration versus the T_VcmBrake[2:0] programming (bits [2:0] in register #3):

T_VCMBRAKE[2:0] BRAKE DURATION

111 7*(2*T

... ...

010 2*(2*T
001 1*(2*T
000 0

bEMF

bEMF
bEMF

) +T

) +T
) +T

bEMF

bEMF
bEMF

Table 14Slow retract duration versus the T_SlowRet[5:0] programming (bits [8:3] in register #3):

T_SLOWRET[5:0] SLOW RET. DURATION

111111 63*T

... ...

000010 2*T
000001 1*T
000000 0

bEMF+TbEMF

bEMF+TbEMF
bEMF+TbEMF

Table 15Full Power retract duration versus the T_FullPower[2:0] programming (bits [11:9] in register #3):

T_FULLPOW[2:0] FULL POWER DURATION

111 7*(32*T

... ...

010 2*(32*T
001 1*(32*T
000 0

bEMF

bEMF
bEMF

) +T

) +T
) +T

bEMF

bEMF
bEMF

* Include typical waveform

1999June10 24

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

VCM+

SOFT RISING

VCM-

BRAKE

SOFT RETRACT

FULL POWER

BRAKE DELAY

FCK135

Fig.17 The states for the VCM retract

Spindle brake after retract sequence :

In case of power down, an emergency procedure is initiated by the PorN signal : the spindle back-EMF is synchronously
rectified to supply the VCM ramp unload function. At the end of the full power step, a spindle short-circuit brake is
activated (SpinMotA, SpinMotB & SpinMotC are together short-circuited to ground). It is supplied by an external reservoir
capacitor connected to pin BrakePower (60).

Shock sensor amplifier:

A complete circuitry is included on-chip to control an external shock sensor.
Figure 14 shows a typical application diagram:

1999June10 25

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Shock Sensor

C

sensor

(55)

Cgain

R

HPF

ShockAmpOut

Amplifier x20

-

(54)

+

-

2

+

3

ShockInput

1

+

-

Amplifier x16.3

(50)

ShockRef

Fig.18 Shock sensor control circuitry

The first amplifier gain is given by : G = C
220µV/G on the 1st stage output.

2V

gain/Csensor

. It has to be set so that the sensor voltage sensitivity becomes

(ext.)

(53)

ShockFiltOut

R

380kΩ

20kΩ

ShockCom

C

com

Window
comparator

(51)

C

4

programmable
threshold

ShockCompOut

(52)

The 2nd amplifier stage gain is internally set to 16.3. The 3rd amplifier stage gain is internally set to 20. The external
capacitor C
pass filter pole. The internal RC low pass filter pole is 8kHz typical. The window of the comparator input (ShockCompInP)
is programmable through the serial interface. The values are given in the following table:

Table 16Window comparator threshold versus ShockThresh[1:0] (bits [9,8] in register #4):

Temperature monitor:

The TDA5345HT includes an analog circuitry that monitors the junction temperature.
Figure 25 shows its diagram:

and R

com

SHOCKTHRESH[1:0] WINDOW

have to be chosen so that : C

HPF

000 74mV 227µV
001 148mV 454µV
010 222mV 681µV
011 296mV 908µV

100 370mV 1.135mV
101 444mV 1.362mV
110 518mV 1.589mV

111 592mV 1.816mV

com

x20kΩ = C

gainxRHPF

. This time constant makes the input high

2ND STAGE INPUT

SENSITIVITY

1999June10 26

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

junction thermometer

V

160_Deg

Temp shut

Voltage
Converter

V

145_Deg

Fig.19 Temperature monitor circuitry

The device is protected against over-temperature by the temperature shutdown circuit. When the temperature of the chip
exceeds 160°C, the device is automatically set to a VCM retract and a spindle disable mode. It remains in this mode
until the temperature goes below 160°C- 30°C= 130°C (30°C is an internal hysteresis).

During normal operation, the signal TempMux provides either a voltage that is function of the chip temperature when
TempSelect = ‘1’ or a digital warning when TempSelect = ‘0’.

When the analog information is selected, the equation of the voltage versus the temperature is:

V

TempMux

2.954 7.55103–⋅




Temperature°C()×–=

1

0

TempMux

55

TempSelect
(bit 0, reg#3)

(18)

When the digital information is selected, you get a temperature warning on pin TempMux (57). If the internal temperature
over passes 145°C, TempMux = ‘1’ and remains high until the temperature comes below 130°C (see Fig.19).

V

TempMux

Fig.20 V

IT IS STRONGLY ADVISED TO USE THE TempMux INFORMATION (analog or digital) TO GENERATE EMERGENCY
PROCEDURES INSTEAD OF WAITING FOR THE TEMPERATURE SHUT DOWN MODE TO TRIGGER. The
temperature shut down has to considered as an ultimate self-protection.

(V)

Vdd5

0

TempMux

0

behaviour versus temperature (TempSelect = ‘1’)

130

145

TEMPERATURE (°C)

1999June10 27

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Power on reset

The Power On Reset circuit monitors the voltage level of +5V supply voltage (pin named VddAna1).
The PorN output (pin #25) is set HIGH when the +5V supply voltage arise above a specified voltage threshold plus an

hysteresis. This LOW to HIGH transition is delayed by a time TC that is determined by the external PorCap capacitor
(connected to pin #26).

This PorN output remains HIGH until +5V supply drops below its voltage threshold. PorN output immediately becomes
LOW. A brake after retract is initiated and the digital section is reset while PorN remains LOW.

The C
reference voltage V

The T

capacitor is charged by a constant current I

PorCap

. The TC time is set then by the following equation:

PorRef

C

T

C

PorCap

time value only depends on the external C

C

VDD

V

hysteresis

1 V

POR_N

V

PorRef

× C

------------------­I

PorCap

PorCap

× C

PorCap

capacitor value.

PorCap

T

c

. The voltage on PorCap pin is compared to the POR circuit

1.23V

------------------­210

⋅

PorCap

6–

615103⋅×===

(19)

threshold

t

T

c

t

Fig.21 Power on reset timing

The value of the +5V supply threshold voltage can be adjusted by adding an external resistor divider on the Por5Adj(28)
. Internally, pin is designed as it is described in figure 20.

Por5Adj

(24)

VddAna1

(28)

R

H5

R

L5

(32)

GndAna2

to the POR circuit

Fig.22 Por5vAdj pin

It is advised to connect external capacitors on pins Por5Adj to filter the power supplies noise. See figure 21.

1999June10 28

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Supply

t

Por5Adj signal
with a capacitor

∆V

PorN

5V

Fig.23 Glitch detector timing

The PorN output can also be driven by the retract sequence manager:
If there is a power supply failure at the sequence start-up or during the sequence, PorN will be kept low during all the

programmed sequence, what ever the supply is restored or not.

0V

Vref=1.23V

Tc

Vdd5

4.1V

PorN

Tc

t

t

VCM-

FCK136

Fig.23

Caution !!

It is not allowed to wake the VCM up ( VcmSleep=‘0’’) if the spindle is not on speed, because a retract sequence would
start on a power supply failure without any clock (generated from the spindle back-EMF). PorN would be maintained low
by the retract manager, waiting for clock pulses.

1999June10 29

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

3.3V linear regulator:

The Tda5345HT includes an analog amplifier suited to drive an external NPN that will supply the 3.3V digital chips used
in the applicationtogether with the internal digital outputs (pins SpinDigOut (44), SpinMechClock (43), PowerFault
(37), ShockCompOut (52), TempMux (57)). The external pin Reg3v3PwrUp is used to enable (Reg3v3Pwr = 5V) or
disable the regulator (Reg3v3Pwr = 0V). When Reg3v3Pwr = 0V, it is possible however to wake the regulator up through
the Reg3v3Enable bit (bit number 1 in register #4).

It has been designed to minimise the external components count.
Figure 25 shows the regulator diagram:

Reg3v3Enable

(from serial interface)

Enable

1.23V

internal
BandGap
voltage
reference

Negative supply regulator (-3V) :

800Ω

2 kΩ

1.24 kΩ

Reg3v3PwrUp

(34)

(46)

RegNPNBase

RegSense

(47)

TempMux

SpinDigOut
PowerFault
SpinMechClock

ShockCompOut

Vdd5

2SC4210 or
similar NPN

3.26V

Fig.25 3.3V linear regulator

decoupling
cap

To 3.3V ICs

5µF

A capacitor-based negative supply regulator is also provided.
Due to process limitations, 2 external shottky diodes need to be added to the 2 external capacitors to make it work.

Figure 25 shows the regulator diagram:

1999June10 30

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

CLOCK

Programmable

divider

500 kHz

Switch

manager

Vdd5

PumpNeg3V

Neg3V

(36)

(35)

Load

3 bits

Band Gap

1.23V

RegNegClk[2,0]

Fig.26 -3V switched cap. regulator

Depending on the external CLOCK value, the programmable CLOCK divider has to be programmed according to the
following table :

Table 17Division factor to program in order to get 500kHz for the -3V switched cap. regulator :

CLOCK REGNEGCLK[2:0] DIVISION FACTOR

10MHz 000 20

12.5MHz 001 22
15MHz 010 30

16.5MHz 011 32
20MHz 100 40
25MHz 101 50
30MHz 110 60
33MHz 111 66

Adjustable bandgap :

An internal regulated voltage source (called BandGap) delivers a very accurate voltage to many different circuitry inside
the IC. This voltage (1.23V) is almost independant of power supply, temperature and process spread. However, there
is still a +/- 3% spread on this voltage. To come to about +/- 0.5%, it is possible to adjust this voltage from an external
micro controller with a very accurate voltage source and an ADC. The following table gives the voltage added or
substracted to the BandGap voltage according to the code written in register 2, bit 4 to 6.

1999June10 31

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

Table 18BandGap :

BDGAPADJ[2,0] VOLTAGE ADJUSTMENT

011 -27.6mV
010 -18.4mV
001 -9.2mV
000 0mV
111 9.2mV
110 18.4mV
101 27.6mV
100 0mV

1999June10 32

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply voltage
V

DD5A/D

Voice coil motor driver
I

out

R

DSon

Spindle motor driver
I

out_StartUp

I

out_Brake

R

DSon

+5V supply voltage 4.5 5.0 5.5 V

maximum VCM output current − 400 mA
VCM power MOS total on

resistance

Tj=140°C
V

= 4.5V

DD5

−−1.5 Ω

maximum spindle output current start-up - 620 mA
spindle output current Brake - - 1.5 A
spindle power MOS total on

resistance

Tj=140°C
V

= 4.5V

DD5

- - 1.5 Ω

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA5345HT TQFP64 plastic low profile quad flat package; 64 leads;

SOT 357BB6

body10x10x1.2mm

LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD5A/D

V

DD5A/D

V

PeakVCM

+5V supplies indefinite time period - 0.3 5.5 V
+5V supplies see note1 -0.3 7 V
VCM drive output voltage Inductance connected to

−0.5 V

+ 0.5 V

DD5

VCM+ and VCM-

I

PeakVCM

VCM drive output peak

peak < 0.5 s 1.0 A

current

V

PeakSpin

spindle drive output voltage Inductance connected to

-0.5 V

+ 0.5 V

DD5

SpinMotA, B & C.

I

PeakSpin

spindle drive output peak

peak < 0.5s 2.0 A

current

V

i

P

tot

T

stor

T

j(max)

other pins I < 1mA -0.5 V

+ 0.5 V

DD5

total Power dissipation 1.1 W
IC storage temperature −55 +125 °C
junction temperature − +140 °C

Note to the limiting values:

1.Stress beyond these levels may cause permanent damage to the device. This is a stress rating only and functional
operation of the device under this condition is not implied.

1999June10 33

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

RECOMMANDED OPERATING CONDITIONS

SYMBOL PARAMETER MIN MAX UNIT

V

DDN

T

AMB

T

JUNC

HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling MOS devices.

ESD according to MIL STD 883C - method 3015 (HBM 1 500Ω, 100pF) 3 pulses (+) and 3 pulses (-) on each pin versus
ground - Class 1: 0 to 1 999 V

THERMAL RESISTANCE

SYMBOL PARAMETER VALUE UNIT

R

th j-a

supply voltage 4.5 5.5 V
operating ambient temperature 0 85 °C
junctiontemperature 0 140 °C

from junction to ambient in free air (TQFP64, SOT 357BB6) 50 °C/W

This is obtained in a PCB tailored to heat dissipation : pin number 16, 32, 48, 64 have to be connected to a good ground
layer to improve the IC heat dissipation.

1999June10 34

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

ELECTRICAL CHARACTERISTICS
(Condition: V

1. Supply current

1-1 Analog and power supply (pin 4, 14, 63, 24, 56together) when there is no current in spindle & VCM motors

= 4.5-5.5V; T

DD5

= 0-85°C; unless otherwise specified); GBD means Guaranted by Design.

AMB

SYMBOL PARAMETER CONDITIONS MIN.

I

Sleep

I

Sleep1

I

Sleep2

I

Sleep3

I

Sleep4

I

Sleep5

sleep current all Sleep bits = ‘1’ 1.1 mA
sleep mode 1 current only Spindle is active 8.8 mA
sleep mode 2 current only ShockSen is active 2.7 mA
sleep mode 3 current only -3V reg is active 8 mA
sleep mode 4 current only DAC12 is active 4.4 mA
sleep mode 5 current only DAC12 & VCM are

TYP.

MAX.

9mA

active

I

Supply

supply current all sections are active 25.5 mA

1-2 digital supply (Vdd5Dig)

SYMBOL PARAMETER CONDITIONS MIN.

I

Sleep

I

Supply

sleep current spinSleep bits = ‘1’ 56 µA/MHz
supply current spinSleep bits = ‘0’ 78 µA/MHz

TYP.

MAX.

2. DIGITAL section

2-1 Inputs / Outputs (3.3V regulator ENABLED !)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

IH

V

IL

V

OH

V

OL

t

r/f

I

IN

high level input voltage 2.0 V
low level input voltage 0.8 V
high level output voltage (I
low level output voltage (I

= 100µA) V

OUT

= 100µA) 0.4 V

OUT

-0.5 V

3v3

rise/Fall time C = 20pF, GbD 20 ns
input leakage current +/- 1 µA

Unit

Unit

2-2 16-bit serial interface

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT.

f

SCLK

δ

SCLK

tr

SCLK

tf

SCLK

t

START

serial Clock GbD 33 MHz
serial Clock duty cycle GbD 30 50 70 %
serial Clock rise time GbD 10 ns
serial Clock fall time GbD 10 ns
chip Select to first Active

GbD T

/2 ns

SCLK

clock edge

t

SU

data to clock setup time GbD 8 ns

1999June10 35

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT.

t

HD

t

FINISH

t

WAIT

3. Spindle circuits

3-1 Spindle driver: (assuming that Resistor @ pin RefCurRes is exactly 33kΩ)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT.

R

DSon

I

StartMax

I

StartStep

I

StartRes

I

RUN

SR

1

SR

2

SR

3

SR

4

ACC

R_FB

V

fbmax

V

fbmin

I

BP

clock to data hold time GbD 2 ns
last active clock to chip

GbD T

/2 ns

SCLK

select inactive on write
time between successive

serial port accesses

total FET resistance I

GbD 5 CLOCK

cycles

= 620 mA 1.5 Ω

SPIN

maximum start-up current DAC6[5,0] = “011111” 620 mA
start-up current step 20 mA
start-up current resolution 5 5 bits
running current continuous 300 mA
fly-backs slew rate control FlyBackSlope[0,1] = “00” 19 26.5 34 mV/µs
fly-backs slew rate control FlyBackSlope[0,1] = “01” 48 59 70 mV/µs
fly-backs slew rate control FlyBackSlope[0,1] = “10” 105 124 143 mV/µs
fly-backs slew rate control FlyBackSlope[01] = “11” 222 256 290 mV/µs
relative accuracy on the 6

-20 +20 %

fly-backs slew-rate
max voltage on spinmotx positive fly-back, I

<100mA

Vdd5+

0.05

Vdd5+

0.2

Vdd5+

0.35
min voltage on spinmotx neg. fly-back, I <100mA -0.35V -0.2V -0.05V V
brake power leakage PorN = “0”, GbD 5 250 nA

V

3-2 Spindle current loop (assuming that Resistor @ pin RefCurRes is exactly 33kΩ)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

ACC

StCur

spindle start-up current

I

> 400mA -6 +6 %

StUp

accuracy

ACCR

StCur

current relative accuracy

I

> 400mA -5 + 5 %

StUp

between each phase

gm

OTA

OTA transconductance GbD 35 50 65 µA/V

3-3 Spindle Fll Charge Pump (assuming that Resistor @ pin RefCurRes is exactly 33kΩ)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

I

ch/disch

SYM

Cur

charge/discharge current 465 500 535 µA
charge/discharge currents

0.98 1.02

symetry

t

r/f

rise/Fall time GbD 1 2 ns

1999June10 36

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

3-4 Spindle Pll Charge Pump (assuming that Resistor @ pin RefCurRes is exactly 33kΩ)

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

I

ch/disch00

I

ch/disch01

I

ch/disch10

I

ch/disch11

SYM

Cur

3-5 back-EMF comparator

charge/discharge current PllCur[1,0] = “00” 0.212 0.25 0.287 µA
charge/discharge current PllCur[1,0] = “01” 0.425 0.5 0.575 µA
charge/discharge current PllCur[1,0] = “10” 0.612 0.72 0.828 µA
charge/discharge current PllCur[1,0] = “11” 0.808 0.95 1.09 µA
chargedischarge currents

0.93 1.07

symetry
rise/Fall time GbD 1 2 ns

SYMBOL PARAMETER CONDITIONS MIN.

V
V
V

OSen
OSdis
CT

comparator offset start up mode 1 8 15 mV
comparator offset running mode -5 0 5 mV
center tap bias voltage biasCt = ‘1’ or PorN = ‘0’ SpinRect

TYP.

Bemf/2

MAX.

4. VCM circuits 4-1 VCM driver

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

R

DSon

I

OS

I

Max+400

I

Max-400

I

Max+100

I

Max-100

total FET resistance (I
output offset current DAC12 = “00000000000”

maximum positive current high Gain, without offset 384 400 416 mA
maximum negative currenthigh Gain, without offset -416 -400 -384 mA
maximum positive current low Gain, without offset 92.5 98.5 102.5 mA
maximum negative currentlow Gain, without offset -102.5 -98.5 -92.5 mA

Lin transconductance linearity 3 different sections

= 400mA) 1.5 Ω

VCM

-10 +10 mA

& R

Sense

= 1Ω

-3 +3 %

measured

I

QUIES

V

VcmVdd5Div2

G

PD

quiescent current 2 legs of the H-bridge 3.4 15 mA
reference voltage accuracyRef = Vdd5/2 -3 +3 %
power driver gain 4.8 4.95 5.1 V/V

DISTO crossover distortion GbD 0
V

V

fbmax

fbmin

max voltage on Vcm+ or

positive fly-back, I<100mA Vdd5+

Vcm­min voltage on Vcm+/- negative fly-back,

0.1

Vdd5+

0.2

Vdd5+

0.3

-0.3 -0.2 -0.1 V

I<100mA

V

RetRefSR

V

RetRefFP

V

RetLim

R

RetTot

retract circutry ref voltage slow retract mode 110 125 140 mV
retract circutry ref voltage full power retract mode 220 250 280 mV
retract voltage limitation full power retract mode 2.45 2.8 3.14 V
total mos resistance in

retract mode

spinRectBemf >= 2.5V
GbD

3.5 Ω

Unit

V

V

1999June10 37

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

4-2 VCM current control

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNITS

GBW error amplifier bandwidth @ unity Gain, GbD 4 5.5 MHz
V

VcmRef

V

ClampOutL

V

ClampOutL

4-3 VCM current sense amplifier

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

ComMod

BW bandwidth GbD 260 530 kHz
R

FB

PSRR power supply rejection

CMRR common mode rejection

Vcm loop ref. voltage generated by DAC-12 1.402 1.482 1.562 V
error amp out clamping Vdd5 = 5V 1.2 1.3 1.4 V
error amp out clamping Vdd5 = 5V 3.6 3.7 3.8 V

input voltage range -0.3 V

DD5

+0.3

feed back resistor 2.5 3.145 3.9 kΩ

@ 1kHz, GbD 60 dB

ratio

@ 1kHz, GbD 60 dB

ratio

V

4-4 VCM back-EMF amplifier

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

ComMod

input voltage range both OpAmps -0.3 V

DD5

+0.3

V

OL

V

OH

minimum output voltage both OpAmps, GbD 100 mV
maximum output voltage both OpAmps, GbD V

DD5

-0.1

PSRR power supply rejection

ratio

CMRR common mode rejection

ratio

both OpAmps, @ 1kHz,
GbD

both OpAmps, @ 1kHz,
GbD

60 dB

60 dB

GBW unity-gain bandwidth 0.77 1.6 MHz

1rst stage input offset -5 +5 mV

G

BEMF2

V

OS2

2nd stage amplifier gain 1.96 2 2.04
2nd stage output offset -20 +20 mV

4-5 VCM DAC12

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

RESO
t

SET

Vref

HighHG

Vref

HighLG

Vref

Middle

Vref

LowLG

12

resolution 12 12 Bits
settling time to within 0.5LSB 2.0 µs
output voltage @ code 7FFcode written to register #8 2.382 2.482 2.582 V
output voltage @ code 7FFcode written to register #7 1.652 1.732 1.852 V
output voltage @ code 000 1.422 1.482 1.542 V

code written to register #7 1.192 1.232 1.272 V

V

V

1999June10 38

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

ClampOutL

INL

12

DNL

12

4-6 VCM offset current using DAC 6

output voltage @ code 800code written to register #8 0.462 0.482 0.502 V
integral non-linearity -5 +5 LSB
differential non-linearity -0.5 +0.5 LSB

SYMBOL PARAMETER CONDITIONS MIN.

RESO

t

SetFull

t

SetLSB

I

OffFullPos

I

OffFullNeg

INL

6

DNL

6

6

resolution 6 6 Bits
settling time, full range GbD 2.0 µs
settling time, 1LSB GbD 1.0 µs
full scale positive current 45 50 55 mA
full scale negative current -55 -50 -45 mA
integral non-linearity -1 +1 LSB
differential non-linearity -0.5 +0.5 LSB

5. Others features 5-1 Power-On-Reset circuit:

SYMBOL PARAMETER CONDITIONS MIN.

V

T5

threshold voltage level for
the 5V supply.

V

H5

R

L5

5V detection hysteresis 80 110 140 mV
resistor between Por5Adj

and GND

RATIO
i

CPOR

V

OP

V

OL

R

PU

t

RES

5v

por5Adj resistors ratio Ratio5 = RL5 / (RL5 + RH5) 0.3
por cap current charge 2.4 µA
minimum operating voltageGbD 0.5 V
low level output voltage IL = 1mA 0.5 V
pull up resistor between Vdd5 & PorN 14 20 26 kΩ
response time 0.5 1 µs

TYP.

TYP.

MAX.

MAX. UNIT

Unit

3.98 4.1 4.22 V

54 kΩ

5-2 Low voltage monitor circuit:

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

FAULT

V

Hfault

t

RES

fault detect voltage 4.08 4.2 4.32 V
fault detection hysteresis 70 100 130 mV
response time 0.5 1 µs

1999June10 39

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

5-3 Thermal monitor

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

OLT

V

OHT

V

ONT

K

TEMP

T

Warn

T

Why

T

Shut

T

Shy

5-4 Shock Sensor

output voltage at low temp T
output voltage at high tempT

= 0°C, TempSel = 1 2.954 V

JUNC
JUNC

= 150°C,

1.896 V

TempSel =1

output voltage at 25°CT

= 25°C, TempSel

JUNC

2.769 V

=1
temperature coefficient -7.55 mV/
thermal warning threshold tempSel = 0 145 °C
thermal warning hysteresistempSel = 0 15 °C
temperature Shutdown 160 °C
thermal Shutdown

30 °C

hysteresis

SYMBOL PARAMETER CONDITIONS MIN.

I

leak

S
Fc
V
V
V
V
V
V
V
V

in

RC
T1
T2
T3
T4
T5
T6
T7
T8

shockinput leakage current@ Vref = 2V, GbD 5 nA
input sensitivity @ 1kHz, GbD 35 µV
RC filter cut-off frequency 6 8 10 kHz
2nd stage input window shockThreh[2,0] = “000” 122 227 306 µV
2nd stage input window shockThreh[2,0] = “001” 386 454 522 µV
2nd stage input window shockThreh[2,0] = “010” 612 681 750 µV
2nd stage input window shockThreh[2,0] = “011” 816 908 1000 µV
2nd stage input window shockThreh[2,0] = “100” 1021 1135 1248 µV
2nd stage input window shockThreh[2,0] = “101” 1226 1362 1498 µV
2nd stage input window shockThreh[2,0] = “110” 1430 1589 1747 µV
2nd stage input window shockThreh[2,0] = “111” 1634 1816 1998 µV

5-5 3.3 V DC-DC linear converter

SYMBOL PARAMETER CONDITIONS MIN.

I

SOURCE

I

SINK

C

DEC

V

O

source current 5 mA
sink current 250 µA
external decoupling cap 4.7 µF
output voltage I

LOAD

constant

& NPN VBE <= 0.7V

V

O_4v1

output voltage same asVO +Vdd5 = 4.1V 3.05 3.2 3.45 V

TYP.

TYP.

MAX.

MAX.

Unit

Unit

3.15 3.3 3.45 V

BW control loopband width GbD 600 kHz

Note:

1.External NPN: 2SC4210 for instance

1999June10 40

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

5-5 -3 V switched capacitor regulator

SYMBOL PARAMETER CONDITIONS MIN.

I

OUT_max

V

OUT

V

OUT_4v1

maximum output current 100 mA
output voltage shottky diodes Vf<= 0.4V -2.88 -3.0 -3.12 V
output voltage shottky diodes Vf<= 0.4V,

tsw < 100ps & Vdd5 = 4.1V

R

O

output ripple Iout between 20 and

100mA + Note 1

Note:

1.C

>= 9.4µF , C

LOAD

PUMP

= 4.7µF

TYP.

MAX.

Unit

-2.7 V

30 mV

1999June10 41

Philips Semiconductors Preliminary specification

5V spindle & VCM driver combo TDA5345HT

+5V

(4) (14) (63) (40) (24) (56)

VcmVddM VcmVddP

IsoSwSo Vdd5Ana1Vdd5Ana2

Vdd5Dig

C2

R3

MR preamp

C6

R6

R5

R1

R2

C2

VCM

C4

R4

C1

C3

C5

(53)

ShockCom

(54)

ShockAmpOut

(51)

ShockFiltOut

(55)

ShockInput

(50)

ShockRef

(31)

OpAmpOut

(30)

OpAmpInM

(18)

VcmRef

(21)

VcmVdd5Div2

(11)

VcmPlus

(62)

RetPmDrain

(6)

VcmMinus

(23)

VcmSenseInP

(22)

VcmSenseInM

(17)

VcmCompensOut

(19)

VcmCompensIn

(20)

VcmInput

(49)

VcmDacOut

(45)

RetReset

(36)

Neg3V

(35)

PumpNeg3V

(33)

RefCurRes

(12)

NC1

(7)

NC2

SpinGndAB

SpinGndC GNDAna2GNDAna1

Reg3v3PwrUp(34)

RegNPNBase

RegSense

SpinMotA
SpinMotB

SpinCenterTap

SpinMotC

SpinRectBemf

SpinVddA

SpinVddBC

BrakePower

SpinSpeedFilter

SpinCompens

BdGap

VcmBemf

TempMux

CLOCK

SCLK

SDATA
SEN_N

SpinDigOut

SpinMechClock

ShockCompOut

PowerFault

PorN

PorCap

Por5Adj

VcmGndPow

GNDAna3

GndDig

(46)
(47)

(3)
(8)

(61)
(13)

(2)
(1)
(10)

(60)
(58)
(59)

(27)

(29)
(57)

(38)
(41)

(39)

(42)
(44)
(43)

(52)
(37)
(25)

(26)
(28)

(9)

C9

C11

T1

C14

Spindle

C13

C12

R7

Analog
to dig.
conv

ASIC

C7

3v3

C10

C8

(5)

Fig.27

TYPICAL APPLICATION SCHEMATIC

1999June10 42

(15)

(32)(16)

GND

(64)

(48)

Philips Semiconductors Preliminary specification

TDA5345HT5 V spindle & VCM driver combo

NOTES

1999 June 10

43

Philips Semiconductors Preliminary specification

TDA5345HT5 V spindle & VCM driver combo

Data sheet status

Data sheet
status

Objective
specification

Preliminary
specification

Product
specification

Product
status

Development

Qualification

Production

Definition

This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make changes at any time without notice in order to
improve design and supply the best possible product.

This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.

[1]

[1] Please consult the most recently issued datasheet before initiating or completing a design.

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one

or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can

reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.

Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone [phone]

 Copyright Philips Electronics North America Corporation 1999

All rights reserved. Printed in U.S.A.

Date of release: 09-99

Document order number: 9397 750 06404

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1999 June 10

44