CS8441 CS8441 85mA Dual H-Bridge Odometer Driver with Divide by Select Features Description The CS8441 is a Stepper Motor Driver that implements an H-Bridge design in order to drive two coils in an eight step sequence per revolution in the divide by 1 mode; 16 step sequence in the divide by 2 mode. The H-Bridge is capable of delivering 85mA to the load. The sequencer insures that the odometer is monotonic. This sequencer is configured such that simultaneous conduction does not occur. Before each successive output sequence the part is taken through a state where both outputs are turned off individually. This tends to minimize the inductive kick back energy that the part must absorb. On chip clamp diodes are across each output to protect the part from the kick back energy that it must absorb. ■ No Cross-conduction in either H-bridge Additional part protection is provided by two functions. The first being Òshort circuit protectionÓ. This function will protect the part in the case of a shorted or partially shorted load. The second protection function is the Òovervoltage functionÓ. This function monitors the level of the supply voltage. In transient conditions such as load dump, the part will shut down, protecting itself. ■ Guaranteed Monotonic ■ Divide by 1 and Divide by 2 Mode ■ On Chip Flyback Diodes ■ Fault Protection Overvoltage Load Dump Protection to 60V Absolute Maximum Ratings Supply Voltage (VCC) (continuous) -40ûC to +105ûC ......................Ð0.5 to 24V (100ms pulse transient) -40ûC to +105ûC ..........................Ð0.5 to 60V Input Voltage (VIN) ..................................................................Ð0.3 to VCC +0.3V Storage Temperature Range (TSTG).............................................-65¡C to 150¡C Junction Temperature Range.......................................................Ð40¡C to 150¡C ESD (Human Body Model) .............................................................................2kV Lead Temperature Soldering Wave Solder(through hole styles only).............10 sec. max, 260¡C peak Block Diagram Package Options 8 Lead PDIP Gnd 1 V CC VCC COILA+ COILB+ COILAÐ COILBÐ SENSOR SENSOR Coil Driver A Input Comp. Sequencer SELECT Gnd SELECT COILA+ COILA- Overvoltage and Short Circuit Protection ¸1 ¸2 Coil Driver B COILB + COILB- Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com Rev. 9/2/92 1 A ¨ Company CS8441 Electrical Characteristics: Unless otherwise stated, these specifications apply for Ð40¡C²TA²105¡C,6.5V²VCC²15.5V. All voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16V. PARAMETER ■ Supply, VCC Supply Voltage Range Supply Current TEST CONDITIONS -40¡C ²TA²105¡C -40¡C²TA²25¡C Transient Pulse, 100ms VCC = 15.5 VDC Outputs not loaded TYP 6.5 6.5 24 Overvoltage Shutdown 16 ■ Speed Sensor Input, SENSOR Input Frequency Range Switching Threshold Hysteresis Input Bias Current 0.8VDC²VIN²VCC Input Voltage Range Operating Input Voltage 10k½ Resistor in Series Input Clamp Current I Clamp at VIN = 0 VDC 0.2 1.2 300 500 0.1 0 MAX UNIT 15.5 24.0 35.0 VDC VDC VDC 35 mA 23 V 1.0 2.4 kHz VDC mVDC µA ±1.0 VCC -15 to VCC -0.4 ■ Divider Select Input, SELECT Logic 0 Input Voltage Logic 1 Input Voltage Logic 0 Input Current 0V²VIN²100mV Logic 1 Input Current 3V²VIN²15.5 VDC ■ Coil Output Drivers Coil Load Coil Inductance Coil Resistance Temperature * Energized Coil Voltage (Both Polarities) A and B MIN -5.0 mA 100 mVDC VDC µA mA 3.0 +25¡C 198 -1 0.75 -100 2.00 210 80 222 Coefficient VCC = 6.5 VDC VCC = 10.0 VDC VCC = 15.5 VDC-20¡C²TA²105¡C VCC = 15.5 VDC,Ð40¡C²TA²Ð20¡C VCC -1.5V VCC -1.6V VCC-1.75V VCC-2.0V ■ Short Circuit Protection Short Circuit Threshold I Coil A + I Coil B Short Circuit Turn-Off Delay 275 5 * Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits. 2 0.35 ½ mH %/¡C ±100 VDC VDC VDC VDC µA 400 mA VCC -0.9V VCC -1.0V VCC -1.1V VCC -1.2V De-Energized Coil Leakage Current VDC VDC µs CS8441 Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION 8L PDIP 1 Gnd Ground connection. 2 COILA+ Output stage, when active, this pin supplies current to COIL A. 3 COILA- Output stage, when active, this pin supplies current to COIL A. 4 SENSOR Input signal from wheel speed or engine rpm. 5 SELECT Selects divide by 1 or divide by 2 mode. 6 COILB- Output stage, when active, this pin supplies current to COIL B. 7 COILB+ Output stage, when active, this pin supplies current to COIL B. 8 VCC Supply Voltage. Circuit Operation Speed Sensor Input SENSOR is a PNP comparator input which accepts a sine wave input or a square wave input. This input is protected from excursions above VCC as well as any below ground, as long as the current is limited to 1.5mA. It has an active clamp set to zero volts to prevent negative input voltages from disrupting normal operation. The sensor input can withstand 150VDC as long as the input current is limited to 1.5mA max using a series resistor of 100k½. Short Circuit VCC Q1 Q3 Sense Resistor Coil Q2 Coil Driver Outputs Q4 Short Circuit Gnd Sense Resistor Simultaneously energizing the source and sink on either leg is not permitted. i.e. Q1 & Q2 or Q3 & Q4 cannot be energized simultaneously. Circuit function is not affected by inductive transients due to coil loads as specified in Transition States section. Figure 1: Coil Driver Output The transition states occur as indicated in Table 1 without any intermediate states permitted. DIVIDE BY ONE MODE SELECT = VCC Table 1: Transition States State Output State Table Coil A Coil B 0 1 2 3 4 5 6 7 + OFF OFF + + + + + OFF OFF The polarity definition for the coil driver outputs is as follows: Polarity Positive (+) Negative (-) Connect Coil + VCC Gnd Figure 2: Divide by 1 SELECT Mode Connect Coil Gnd VCC DIVIDE BY TWO MODE SELECT = Gnd Divider Select Input The speed sensor input frequency is divided by one or divided by two by connecting the divider select input, (Pin 5) as follows: Logic 0 = divide by 2 Logic 1 = divide by 1 Figure 3: Divide by 2 SELECT Mode 3 Overvoltage and Short Circuit Protection CS8441 Odometer Application Diagram COIL A C1 - 10µF C2 - 0.1µF C3 - 0.01µF R1 - 3.9½, 500mW R2 - 100k½ R3 - 15k½ D1 - 1A, 600PIV Z1 - 50V, 500mW COIL A - 210±12½, 80mH COIL B - 210±12½, 80mH COILA+ COIL B COILAÐ COILB+ CS8441 VCC D1 COILBÐ SENSOR SELECT Gnd R1 IGN C2 C1 Z1 R3 Buffered Speed Signal (Open Collector Drive) R2 C3 Package Specification PACKAGE THERMAL DATA PACKAGE DIMENSIONS IN mm (INCHES) D Lead Count Metric Max Min 10.16 9.02 8L PDIP Thermal Data English Max Min .400 .355 RQJC RQJA 8 Lead PDIP 52 100 typ typ ûC/W ûC/W Plastic DIP (N); 300 mil wide 7.11 (.280) 6.10 (.240) 8.26 (.325) 7.62 (.300) 1.77 (.070) 1.14 (.045) 2.54 (.100) BSC 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) 0.39 (.015) MIN. .558 (.022) .356 (.014) REF: JEDEC MS-001 D Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same. Ordering Information Part Number CS8441XN8 Rev. 9/2/92 Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. Description 8 Lead PDIP 4 © 1999 Cherry Semiconductor Corporation