TDA5345HT datasheet(6/44 Pages) PHILIPS

6 / 44 page

1999 June 10

Philips Semiconductors

Preliminary speciﬁcation

5 V spindle & VCM driver combo

TDA5345HT

SCLK

serial port Clock

SEN_N

serial port ENABLE line: active low

SpinMechClock

spindle rotation speed (1 pulse / revolution)

SpinDigOut

spindle back-EMF comparator output or commutation clock

RetReset

external capacitor used to reset the retract sequence state machine

RegNPNBase

3v3 DC-DC converter output (drives an external NPN)

RegSense

3v3 DC-DC converter input

GndDig

digital ground

GROUND

VcmDacOut

12-bit VCM DAC output

ShockRef

shock sensor reference voltage

ShockFiltOut

shock sensor RC low pass ﬁlter output

ShockCompOut

shock sensor comparator output

ShockCom

shock sensor input common mode

ShockAmpOut

shock sensor ampliﬁer output

ShockInput

shock sensor input

Vdd5Ana2

analog power supply

SUPPLY

TempMux

internal thermal monitor circuitry voltage output

SpinSpeedFilter

external FLL/PLL speed loop ﬁlter

SpinCompens

spindle current loop compensation capacitor

BrakePower

external capacitor to supply the spindle brake at power down

SpinCenterTap

spindle centre tap connection

RetPmosDrain

retract Pmos transistor drain connection

IsoSwSo

spindle power outputs supply

SUPPLY

GNDAna3

analog ground

GROUND

SYMBOL

PIN #

DESCRIPTION

I/O

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