KA2821D

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 ~ +75°C Rev. 1.0.2 May. 2000. ©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...