LD-SPM-VCM-0010-050 SPINDLE/VCM MEGACELL
The LD-SPM-VCM-0010-050 Spindle/VCM megacell is a CMOS monolithic device that integrates spindle and VCM controllers as well as power stages into one megacell. The device operates from 3.3V power supply and 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, 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.
FEATURES
General Features:
- Operates from single supply, 3.3V
- 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
- Includes 1.8V, 2.5V and -3V regulator
- Low power consumption, 9mA 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
- 0.4 A current capability with Ron = 1.4 W
- Digital commutation delay and blanking
- Programmable delay from Bemf zero crossing
- External INDEX signal for spin lock
- Active spindle braking capability
Active spindle braking capability
- 0.4 Amp current capability with Ron = 2.2 W
- Programmable 14-bit DAC
- Ramp load/unload capability with 10-bit ADC
- Programmable VCM current controlled by sense resistor
SYSTEM OVERVIEW
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