AT78C7005 Datasheet | Atmel

Features - - - - - - - - - - Operates from Single Supply: 3.3V or 5V 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 m A in Normal Run Mode Spindle Driver - mutator is Driven by a FLL for High Immunity to Jitter - Programmable 10-bit DAC - Adjustable Slew Rate Control - External Startup Capability - 1.0A Current Capability with Ron = 1Ω - Digital mutation 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 = 1.5Ω - Programmable 14-bit DAC - Ramp Load/Unload Capability with 10-bit ADC - Power-off Retract with 9V Charge-pump - Programmable VCM Current Controlled by Sense Resistor - Available in a Variety of Packages Depending on Customer Requirements Spindle/ VCM Motor Controller/ Drivers AT78C7005 Summary Description The AT78C7005 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 or 5V power supply. The AT78C7005 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...