www.fairchildsemi.com KA2821D Stepping Motor Driver Features Description • • • • • • • The KA2821D is a monolithic integrated circuit, and suitable as a two-phase stepping motor driver of a 3.5-inch FDD system. 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 20-SOP-300 Typical Application Ordering Information • Floppy disk drive (FDD) • General stepping motor Device Package Operating Temp. KA2821D 20-SOP-300 −20 ~ +75°C Rev. 1.0.2 May. 2000. ©2000 Fairchild Semiconductor International 1 KA2821D Pin Assignments NC VCC 1 20 2 19 3 18 4 17 5 16 NC NC VSA AOUT SGND AOUT PGND KA2821D 6 PGND 15 PGND PGND 7 14 8 13 9 12 10 11 SGND BOUT DIRB BOUT CE VSB NC NC Pin Definitions Pin Number Pin Name I/O Pin Function Description Channel 1 NC - No connection 2 VCC - Logic part supply voltage A, B 3 DIRA I A-channel direction input A 4 SGND - Signal ground A, B 5 PGND - Power ground A, B 6 PGND - Power ground A, B 7 SGND - Signal ground A, B 8 DIRB I B-channel direction input 9 CE I Chip enable input 10 NC - No connection - B A, B - 11 NC - No connection - 12 VSB - B-channel seeking supply voltage B 13 BOUT O B-channel output B 14 BOUT O B-channel inverting output B 15 P-GND - Power ground A, B 16 P-GND - Power ground A, B 17 AOUT O A-channel inverting output A 18 AOUT O A-channel output A 19 VSA - A-channel seeking supply voltage A 20 NC - No connection - 2 KA2821D Internal Block Diagram VCC DIRA 19 VSA 18 AOUT 17 AOUT 16 PGND 12 VSB 14 BOUT 13 BOUT 15 PGND 2 3 TTL Interface TSD DIRB 8 CE 9 TTL Interface 3 KA2821D Absolute Maximum Ratings (Ta = 25°C) Parameter Symbol Value Unit VCC 7.0 V VSA, B 15.0 V Input voltage VIN 0 ~ VCC V Seeking output current (Continuouts) IOS 330 mA IOSPEAK 500 mA Logic part supply voltage Seeking supply voltage Seeking output current (Peak) Package power dissipation PD 1.0 W Operating temperature range TOPR −20 ~ 75 °C Storage temperature TSTG −40 ~ 125 °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 = 25°C) Parameter Logic part supply voltage Seeking supply voltage Symbol Min. Typ. Max Unit VCC 4.5 5.0 5.5 V VSA, B 4.5 - 13.8 V 4 KA2821D Electrical Characteristics (Ta=25°C, VCC=5V, VSA=12V, VSB=12V, unless specified otherwise) Parameter Symbol Conditions Min. Typ. Max. Units Digital input “L” voltage VIL - - - 0.8 V Digital high level input voltage VIH - 2.0 - - V Digital low input current IIL VIN=0.8V - 0 10 µA Digital high input current IIH1 VIN=2.0V - 1 10 µA IIH2 VIN=5V - 0.3 1.0 mA IVCCL CE=0.8V - 25 3 mA Supply current IVSL CE=0.8V - 6 10 mA IVCCH CE=0.8V - 25 33 mA IVSH CE=2.0V - 1 2 mA Output sustain voltage VSUS IO=10mA, CE=0.8V 18 - - V VSA, B output saturation voltage VSAT1 IO=300mA, CE=2.0V - 1.5 2.0 V VFU IO=130mA (Upper) - 3.0 5.0 V VFL IO=330mA (Lower) - 1.5 2.0 V TPLH Input pulse (2kHz) - 1.0 5.0 µs TPHL Input pulse (2kHz) - 1.0 5.0 µs Output clamp voltage Output delay time TSD operating temperature TSD hysterisis TSD - 125 150 - °C ∆TSD - - 25 - °C 5 KA2821D Application Information 1. MOTOR CONTROL LOGIC Mode selection-truth table Input Output CE DIRY YOUT YOUT L L L H L H H L H L X X H H X X 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 Operating Mode Seeking Mode Open Mode KA2821D Timing Chart CE DIRA, B TPLH TPHL 50% A, BOUT A, BOUT TPLH TPHL Typical Application Circuits 1 20 NC NC VCC(5V) VCC A-CH in DIRA SGND PGND 2 19 3 18 4 17 5 16 PGND 6 SGND DIRB KA2821D VSA AOUT Load A AOUT PGND 15 PGND 7 14 BOUT 8 13 BOUT 9 12 10 11 Load B B-CH in Chip enable in CE VSB NC 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. 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. www.fairchildsemi.com 12/1/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International