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| www.fairchildsemi.com KA2821D Stepping Motor Driver Features * * * * * * * Built-in chip enable function (Active low) Low saturation voltage Low power dissipation Input level: TTL, LSTTL, 5V CMOS compatible Standard MPU direct interface Built-in Thermal Shutdown(TSD) circuit 2-CH H-bridge driver Description The KA2821D is a monolithic integrated circuit, and suitable as a two-phase stepping motor driver of a 3.5-inch FDD system. 20-SOP-300 Typical Application * Floppy disk drive (FDD) * General stepping motor Ordering Information Device KA2821D Package 20-SOP-300 Operating Temp. -20 ~ +75C Rev. 1.0.2 May. 2000. (c)2000 Fairchild Semiconductor International 1 KA2821D Pin Assignments 1 2 3 NC 4 SGND 5 PGND 6 PGND 7 SGND 8 DIRB 9 CE 10 NC 11 NC 12 VSB 13 BOUT 14 BOUT 16 17 AOUT PGND 15 PGND 20 19 18 AOUT NC VCC NC VSA KA2821D Pin Definitions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name NC VCC DIRA SGND PGND PGND SGND DIRB CE NC NC VSB BOUT BOUT P-GND P-GND AOUT AOUT VSA NC I/O I I I O O O O Pin Function Description No connection Logic part supply voltage A-channel direction input Signal ground Power ground Power ground Signal ground B-channel direction input Chip enable input No connection No connection B-channel seeking supply voltage B-channel output B-channel inverting output Power ground Power ground A-channel inverting output A-channel output A-channel seeking supply voltage No connection Channel A, B A A, B A, B A, B A, B B A, B B B B A, B A, B A A A - 2 KA2821D Internal Block Diagram 19 VCC VSA 2 18 AOUT DIRA 3 TTL Interface 17 16 TSD AOUT PGND 12 14 8 VSB BOUT DIRB TTL Interface 13 CE BOUT 9 15 PGND 3 KA2821D Absolute Maximum Ratings (Ta = 25C) Parameter Logic part supply voltage Seeking supply voltage Input voltage Seeking output current (Continuouts) Seeking output current (Peak) Package power dissipation Operating temperature range Storage temperature Symbol VCC VSA, B VIN IOS IOSPEAK PD TOPR TSTG Value 7.0 15.0 0 ~ VCC 330 500 1.0 -20 ~ 75 -40 ~ 125 Unit V V V mA mA W C C Power Dissipation Curve 1.33 Power Dissipation : PD[W] 1.0 1.0 0.5 0 0 25 50 75 100 125 150 175 Ambient temperature, Ta [C] Recommended Operating Conditions (Ta = 25C) Parameter Logic part supply voltage Seeking supply voltage Symbol VCC VSA, B Min. 4.5 4.5 Typ. 5.0 Max 5.5 13.8 Unit V V 4 KA2821D Electrical Characteristics (Ta=25C, VCC=5V, VSA=12V, VSB=12V, unless specified otherwise) Parameter Digital input "L" voltage Digital high level input voltage Digital low input current Digital high input current Symbol VIL VIH IIL IIH1 IIH2 IVCCL Supply current IVSL IVCCH IVSH Output sustain voltage VSA, B output saturation voltage Output clamp voltage Output delay time TSD operating temperature TSD hysterisis VSUS VSAT1 VFU VFL TPLH TPHL TSD TSD VIN=0.8V VIN=2.0V VIN=5V CE=0.8V CE=0.8V CE=0.8V CE=2.0V IO=10mA, CE=0.8V IO=300mA, CE=2.0V IO=130mA (Upper) IO=330mA (Lower) Input pulse (2kHz) Input pulse (2kHz) Conditions Min. 2.0 18 125 Typ. 0 1 0.3 25 6 25 1 1.5 3.0 1.5 1.0 1.0 150 25 Max. 0.8 10 10 1.0 3 10 33 2 2.0 5.0 2.0 5.0 5.0 Units V V A A mA mA mA mA mA V V V V s s C C 5 KA2821D Application Information 1. MOTOR CONTROL LOGIC Mode selection-truth table Input CE L L H H DIRY L H L H YOUT L H X X Output YOUT H L X X Open Mode Operating Mode Seeking Mode Notes: DIRY: DIRA or DIRB (Direction input) YOUT: AOUT or BOUT (Non-inverting output) YOUT: AOUT or BOUT (Inverting output) Y: Indicate each channel (A and B) X: High impedance 2. MAXIMUM CURRENT DRIVE CAPACITY * Peak seeking output current: 0.5A * Continuous seeking output current: 0.33A * Holding output current: 0.2A 6 KA2821D Timing Chart CE DIRA, B TPLH TPHL A, BOUT 50% A, BOUT TPHL TPLH Typical Application Circuits 1 NC VCC(5V) VCC 2 20 NC 19 VSA A-CH in DIRA 3 18 AOUT Load A AOUT SGND 4 17 PGND 5 16 PGND PGND 6 KA2821D 15 PGND SGND B-CH in DIRB Chip enable in CE 7 14 BOUT Load B 8 13 BOUT 9 12 VSB 10 NC 11 NC 7 KA2821D DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 12/1/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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