Spindle/ Motor Controller/ Drivers AT78C7005 Summary Description

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Spindle/ Motor Controller/ Drivers AT78C7005 Summary Description

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Operates from Single Supply: 3.3V Small Footprint 64-Pin TQFP Package Flip Chip Precision Low-voltage Monitor Circuitry Power Supply Master Power Reset Serial Port Interface with Read-back Capability Over-temperature Protection/Warning Shock Sensor Signal Processing On-chip 1.8V, 2.5V Regulators Power Consumption, Normal Mode Spindle Driver Commutator Driven High Immunity Jitter Programmable 10-bit Adjustable Slew Rate Control External Startup Capability 1.0A Current Capability with Digital Commutation Delay Blanking Programmable Delay from BEMF Zero Crossing External INDEX Signal Spin Lock Active Spindle Braking Capability Driver 0.4A Current Capability with Programmable 14-bit Ramp Load/Unload Capability with 10-bit Power-off Retract with Charge-pump Programmable Current Controlled Sense Resistor Available Variety Packages Depending Customer Requirements
Spindle/ Motor Controller/ Drivers AT78C7005 Summary
Description
AT78C7005 CMOS monolithic device that integrates Spindle controllers well power stages into chip. device operates from 3.3V power supply. AT78C7005 designed small-form-factor hard disk drive application. precision low-voltage detection circuit monitors power supply initiates retract voltage fault condition. 3-line serial port interface with read back capability provides interface microprocessor. Spindle driver features transconductance amplifier, current sense amplifier, power output drivers, sequencer, internal delay/masking logic, Spindle brake circuit, FLL, charge-pump locking spindle programmed rotational speed. driver features transconductance amplifier, differential input current sense amplifier, ramp load/unload capability, power output amplifier.
3432BS-NETST-5/04
Note: This summary document. complete document available under NDA. more information, please contact your local Atmel sales office.
Figure AT78C7005 Block Diagram
ADVANCE SCOMP BEMFO INDEX
SYSCLK
Prescaler
Bemf Comp
Comp
Voltage Limiter
VREF
XOUT
SHOCKIN
Bemf Comp
VREF
SHOCKB
Comp
SDEN SERIAL PORT SCLK SDATA
VC1.8 V1.8 VC2.5 V2.5 VC3.3 V3.3 VREF
1.8V TMON 2.5V 3.3V
OTSD VVCC
VREF IREF
VCMP
RREF CRET PORB
VCMN ERRO ERRI
DRET
CRET
PUMP
10bit
VCMS
RETO
DGND
DVCC
AGND
AVCC
RGND
RVCC
AT78C7005
3432BS-NETST-5/04
DACO
AT78C7005
Packaging Information
64A1 TQFP
IDENTIFIER
0°~7°
COMMON DIMENSIONS (Unit Measure SYMBOL 0.05 0.95 11.75 9.90 11.75 9.90 0.30 0.09 0.45 1.00 12.00 10.00 12.00 10.00 0.50 1.20 0.15 1.05 12.25 10.10 12.25 10.10 0.45 0.20 0.75 Note Note NOTE
Notes:
This package conforms JEDEC reference MS-026, Variation ACD. Dimensions include mold protrusion. Allowable protrusion 0.25 side. Dimensions maximum plastic body size dimensions including mold mismatch. Lead coplanarity 0.10 maximum.
4/22/2004 2325 Orchard Parkway Jose, 95131 TITLE 64A1, 64-lead, Body Size, Body Thickness, Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) DRAWING 64A1 REV.
3432BS-NETST-5/04
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3432BS-NETST-5/04

Spindle/ Motor Controller/ Drivers AT78C7005 Summary Description

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