at78c7015 ATMEL Corporation, at78c7015 Datasheet

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at78c7015

Manufacturer Part Number
at78c7015
Description
Spindle/vcm Motor Controller/drivers
Manufacturer
ATMEL Corporation
Datasheet
Features
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.
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
VCM Driver
Packaging: Variety Available Depending on Customer Needs
– 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 R
– Digital Commutation Delay and Blanking
– Programmable Delay from BEMF Zero Crossing
– External INDEX Signal for Spin Lock
– Active Spindle Braking Capability
– 0.4A Current Capability with R
– Programmable 14-bit DAC
– Ramp Load/Unload Capability with 10-bit ADC
– Programmable VCM Current Controlled by Sense Resistor
on
on
= 1.4Ω
= 2.2Ω
Note: This is a summary document. A complete document
is available under NDA. For more information, please con-
tact your local Atmel sales office.
Spindle/VCM
Motor
Controller/
Drivers
AT78C7015
Summary
3439BS–NETST–5/04

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at78c7015 Summary of contents

Page 1

... 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. ...

Page 2

... AT78C7015 2 AT78C7015 Block Diagram CLK Prescaler SYSCLK UP FLL SCMD Voltage Limiter 10 bit DAC VREF XIN XOUT SHOCKIN VREF F40 SHOCKB BG VREF IREF RREF RTH POR CPOR PORB V25 2.5V VC25 V18 1.8V VC18 MCMD -3V MSNS MCOMP CRET 14 bit RETO DAC DRET RVCC RGND ...

Page 3

... Ordering Information Ordering Code AT78C7015 64A1 64-lead Body Size, 1.0 mm Body Thickness, 0.5 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) 3439BS–NETST–5/04 Package 64A1 Package Type Operation Range 3 ...

Page 4

... This package conforms to JEDEC reference MS-026, Variation ACD. 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum plastic body size dimensions including mold mismatch. 3. Lead coplanarity is 0.10 mm maximum. 2325 Orchard Parkway San Jose, CA 95131 R AT78C7015 TITLE 64A1, 64-lead Body Size, 1 ...

Page 5

... Fax: (81) 3-3523-7581 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 ...

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