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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 = 1.4 - 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 = 2.2 - 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 Spindle/VCM Motor Controller/ Drivers AT78C7015 Summary Description The AT78C7015 is a CMOS monolithic device that integrates Spindle and VCM controllers 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. 3439AS-NETST-2/04 Note: This is a summary document. A complete document is available under NDA. For more information, please contact your local Atmel sales office. Figure 1. AT78C7015 Block Diagram SCOMP ADVANCE BEMFO INDEX MUX SPT SYSCLK Prescaler CLK FLL UP DN Bemf Comp FLL SCMD CHP SPP Comp PWM A Voltage Limiter SPA OTA 10 bit DAC 1 SEQ B C SPB SPC VREF XIN XOUT SHOCKIN 3 bit DAC SPN Bemf Comp SSO VREF F40 SHOCKB Comp SDEN SERIAL PORT SCLK SDATA VREF BG TMON IREF RREF RTH CPOR PORB V25 VC25 V18 VC18 MCMD MSNS MCOMP CRET OTSD OTW VVCC VMP POR P EA VCMP 2.5V 1.8V N VCMN VGND -3V SA VCMS VCOMP BA RETO DRET RVCC RGND 14 bit DAC RETR 10bit ADC M U X S/H B S/H A VBO VSO VEO VDAC AGND 2 AT78C7015 3439AS-NETST-2/04 DGND DVCC AVCC Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel: (33) 4-76-58-30-00 Fax: (33) 4-76-58-34-80 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel: (33) 4-42-53-60-00 Fax: (33) 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Literature Requests www.atmel.com/literature 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. (c) Atmel Corporation 2004. All rights reserved. Atmel(R) 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. 3439AS-NETST-2/04 |
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