Datasheet > AT78C7015

AT78C7015

更新时间： 2024-01-10 00:42:45

品牌	Logo	应用领域
爱特美尔 - ATMEL		驱动器控制器
页数	文件大小	规格书
5页	134K
描述
Spindle/VCM Motor Controller/Drivers AT78C7015 Summary

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AT78C7015 数据手册

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

Spindle/VCM

Motor

Controller/

Drivers

– 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_on= 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

AT78C7015

Summary

– 0.4A Current Capability with R_on= 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.

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.

12 3 4 5

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