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PDF AT78C7015 Data sheet ( Hoja de datos )
| Número de pieza | AT78C7015 | |
| Descripción | Spindle/VCM Motor Controller/Drivers | |
| Fabricantes | ATMEL Corporation | |
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Features
• 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
– Commutator is Driven by a FLL for High Immunity to Jitter
– Programmable 10-bit DAC
– Adjustable Slew Rate Control
– External Startup Capability
– 0.4A Current Capability with Ron = 1.4Ω
– Digital Commutation Delay and Blanking
– Programmable Delay from BEMF Zero Crossing
– External INDEX Signal for Spin Lock
– Active Spindle Braking Capability
• VCM Driver
– 0.4A Current Capability with Ron = 2.2Ω
– Programmable 14-bit DAC
– Ramp Load/Unload Capability with 10-bit ADC
– Programmable VCM Current Controlled by Sense Resistor
• Packaging: Variety Available Depending on Customer Needs
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.
Spindle/VCM
Motor
Controller/
Drivers
AT78C7015
Summary
3439BS–NETST–5/04
Note: This is a summary document. A complete document
is available under NDA. For more information, please con-
tact your local Atmel sales office.
1 page  
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Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard
warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any
errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and
does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are
granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use
as critical components in life support devices or systems.
© Atmel Corporation 2004. All rights reserved. Atmel® and combinations thereof, are the registered trademarks of Atmel Corporation or its
subsidiaries. Other terms and product names may be the trademarks of others.
Printed on recycled paper.
3439BS–NETST–5/04
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet AT78C7015.PDF ] | |
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