8980 Datasheet, PDF(5/8 Page) Allegro MicroSystems – SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER

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8980 Datasheet, PDF (5/8 Pages) Allegro MicroSystems – SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER

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8980

SUPERSERVOâ¢

SPINDLE & VOICE-COIL

ACTUATION MANAGER/DRIVER

VBOOST(L)

VPF(GATE)

VREF

VREF(x2)

POROUT

TRIP ADJ

CLK

SER DATA IN

CLK SER

LOAD

EXT XFR

AMUX1

AMUX2

DMUXOUT

OUTP

OUTN

VSENS(act)

Internally generated intermediate voltage for driving the gates of all sink-side power output

transistors, the bandgap reference, and fault monitors. This source is regulated and requires

a compensation capacitor from this terminal to ground.

Control voltage provided to drive the gate of an optional external enhancement-mode power

FET, augmenting the internal blocking FET between VCC(PWR) and VM.

Programmable reference voltage output. This reference tracks VREF(x2) and may be used as a

relative signal ground.

Programmable reference voltage output. Derived from a trimmed internal bandgap reference.

May be used as the reference for system DAC and ADC.

Power-on reset for the application system. Active low guaranteed by design to be active on

power up. Also occurs as a result of VCC(A) degrading below the BLACKOUT under-voltage

threshold.

VUV (TRIP); trip threshold adjust input (an external resistor divider between VCC(A) and ground) for

the under-voltage BLACKOUT fault monitor. A capacitor at this terminal can provide for time

domain filtering.

fCLK(2MHz); reference for all internal analog signal-processing functions. Affects frequency

domain placement of all poles, zeros, and bandwidths.

Non-inverting microcontroller serial-data input used for transferring data to all internal parameter

and mode-control registers.

fCLK(SER); reference for the serial data interface. Data is transferred on the positive-going edge

of this clock.

Active low. Begins and ends data transfer.

Direct clock gating data from temporary internal latch to control register. This continuous time

input is redundant to the XFR bit, which is embedded in the serial data format. It is internally

synchronized to the fCLK(2MHz) positive-going edge.

Analog input or output. Also used to drive internal nodes.

Analog input or output. Also used to drive internal nodes for calibration and measurement on

internal analog functions.

Non-inverting digital multiplexer output. Used to probe internal nodes allowing precise time-

domain measurements. Also used to extract internal status and diagnostic information.

VOUT(P); voice-coil power output. Full-bridge differential complement to VOUT(N).

VOUT(N); voice-coil power output. Full-bridge differential complement to VOUT(P).

The voltage at this terminal is proportional to voice-coil actuator current.

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