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AT78C7015 Datasheet

  • AT78C7015

  • Spindle/VCM Motor Controller/Drivers

  • atmel   atmel

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Features
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Operates from Single Supply: 3.3V
Small Footprint 64-Pin TQFP Package or Flip Chip
Precision Low-voltage Monitor Circuitry for the Power Supply
Master Power on Reset
Serial Port Interface with Read-back Capability
Over-temperature Protection/Warning
Shock Sensor Signal Processing
On-chip 1.8V, 2.5V and -3V Regulators
Low Power Consumption, 9 mA in Normal Run Mode
Spindle Driver
鈥?Commutator is Driven by a FLL for High Immunity to Jitter
鈥?Programmable 10-bit DAC
鈥?Adjustable Slew Rate Control
鈥?External Startup Capability
鈥?0.4A Current Capability with R
on
= 1.4鈩?/div>
鈥?Digital Commutation Delay and Blanking
鈥?Programmable Delay from BEMF Zero Crossing
鈥?External INDEX Signal for Spin Lock
鈥?Active Spindle Braking Capability
鈥?/div>
VCM Driver
鈥?0.4A Current Capability with R
on
= 2.2鈩?/div>
鈥?Programmable 14-bit DAC
鈥?Ramp Load/Unload Capability with 10-bit ADC
鈥?Programmable VCM Current Controlled by Sense Resistor
鈥?/div>
Packaging: Variety Available Depending on Customer Needs
Spindle/VCM
Motor
Controller/
Drivers
AT78C7015
Summary
Description
The AT78C7015 is a CMOS monolithic device that integrates Spindle and VCM con-
trollers as well as power stages into one chip. The device operates from 3.3V power
supply. The AT78C7015 is designed for a small-form-factor hard disk drive application.
A precision low-voltage detection circuit monitors the power supply and initiates VCM
retract at voltage fault condition. A 3-line serial port interface with read back capability
provides interface to the microprocessor.
The Spindle driver features a transconductance amplifier, a current sense amplifier,
power output drivers, sequencer, internal delay/masking logic, Spindle brake circuit,
FLL, and charge-pump for locking the spindle to the programmed rotational speed.
The VCM driver features a transconductance amplifier, differential input current sense
amplifier, ramp load/unload capability, and power output amplifier.
3439BS鈥揘ETST鈥?/04
Note: This is a summary document. A complete document
is available under NDA. For more information, please con-
tact your local Atmel sales office.

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