Spindle/vcm Motor Controller/drivers At78c7015 Summary

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 By ATMEL Corporation