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| CS8441 CS8441 85mA Dual H-Bridge Odometer Driver with Divide by Select 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. Additional part protection is provided by two functions. The first being Oshort circuit protectionO. This function will protect the part in the case of a shorted or partially shorted load. The second protection function is the Oovervoltage functionO. This function monitors the level of the supply voltage. In transient conditions such as load dump, the part will shut down, protecting itself. Features s No Cross-conduction in either H-bridge s Divide by 1 and Divide by 2 Mode s Guaranteed Monotonic s On Chip Flyback Diodes s Fault Protection Overvoltage Load Dump Protection to 60V Absolute Maximum Ratings Supply Voltage (VCC) (continuous) -40uC to +105uC ......................0.5 to 24V (100ms pulse transient) -40uC to +105uC ..........................0.5 to 60V Input Voltage (VIN) ..................................................................0.3 to VCC +0.3V Storage Temperature Range (TSTG).............................................-65C to 150C Junction Temperature Range.......................................................40C to 150C ESD (Human Body Model) .............................................................................2kV Lead Temperature Soldering Wave Solder(through hole styles only).............10 sec. max, 260C peak Block Diagram V CC Package Options 8 Lead PDIP Gnd 1 COILA+ COILA SENSOR VCC COILB+ COILB SELECT SENSOR Input Comp. Coil Driver A COILA+ COILA- Sequencer Overvoltage and Short Circuit Protection SELECT 1 2 Coil Driver B COILB + COILB- Gnd Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com Rev. 9/2/92 1 A Company CS8441 Electrical Characteristics: Unless otherwise stated, these specifications apply for 40CTA105C,6.5VVCC15.5V. All voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT s Supply, VCC Supply Voltage Range Supply Current Overvoltage Shutdown -40C TA105C -40CTA25C Transient Pulse, 100ms VCC = 15.5 VDC Outputs not loaded 6.5 6.5 24 16 15.5 24.0 35.0 35 23 VDC VDC VDC mA V s Speed Sensor Input, SENSOR Input Frequency Range Switching Threshold Hysteresis Input Bias Current 0.8VDCVINVCC Input Voltage Range Operating Input Voltage Input Clamp Current 10k1/2 Resistor in Series I Clamp at VIN = 0 VDC 0.2 1.2 300 0 500 0.1 1.0 2.4 1.0 VCC -15 to VCC kHz VDC mVDC A VDC VDC mA -0.4 -5.0 s Divider Select Input, SELECT Logic 0 Input Voltage Logic 1 Input Voltage Logic 0 Input Current 0VVIN100mV Logic 1 Input Current 3VVIN15.5 VDC s Coil Output Drivers Coil Load Coil Inductance Coil Resistance Temperature * Energized Coil Voltage (Both Polarities) A and B 100 3.0 -1 0.75 -100 2.00 mVDC VDC A mA +25C Coefficient VCC = 6.5 VDC VCC = 10.0 VDC VCC = 15.5 VDC-20CTA105C VCC = 15.5 VDC,40CTA20C 198 210 80 222 0.35 1/2 mH %/C VDC VDC VDC VDC A VCC -1.5V VCC -1.6V VCC-1.75V VCC-2.0V VCC -0.9V VCC -1.0V VCC -1.1V VCC -1.2V 100 De-Energized Coil Leakage Current s Short Circuit Protection Short Circuit Threshold I Coil A + I Coil B Short Circuit Turn-Off Delay 275 5 400 mA s * Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits. 2 CS8441 Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION 8L PDIP 1 2 3 4 5 6 7 8 Gnd COILA+ COILASENSOR SELECT COILBCOILB+ VCC Ground connection. Output stage, when active, this pin supplies current to COIL A. Output stage, when active, this pin supplies current to COIL A. Input signal from wheel speed or engine rpm. Selects divide by 1 or divide by 2 mode. Output stage, when active, this pin supplies current to COIL B. Output stage, when active, this pin supplies current to COIL B. 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 100k1/2. Short Circuit VCC Q1 Q3 Sense Resistor Overvoltage and Short Circuit Protection Coil Q2 Q4 Coil Driver Outputs 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. The transition states occur as indicated in Table 1 without any intermediate states permitted. Table 1: Transition States Figure 1: Coil Driver Output Short Circuit Gnd Sense Resistor DIVIDE BY ONE MODE SELECT = VCC State 0 1 2 3 4 5 6 7 Output State Table Coil A + OFF OFF + + Coil B + + + OFF OFF Figure 2: Divide by 1 SELECT Mode DIVIDE BY TWO MODE SELECT = Gnd The polarity definition for the coil driver outputs is as follows: Polarity Positive (+) Negative (-) Connect Coil + VCC Gnd Connect Coil Gnd VCC 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 CS8441 Odometer Application Diagram C1 - 10F C2 - 0.1F C3 - 0.01F R1 - 3.91/2, 500mW R2 - 100k1/2 R3 - 15k1/2 D1 - 1A, 600PIV Z1 - 50V, 500mW COIL A - 210121/2, 80mH COIL B - 210121/2, 80mH D1 IGN Z1 R3 Buffered Speed Signal (Open Collector Drive) C1 C2 R1 COIL A COIL B COILA+ COILA COILB+ COILB CS8441 SENSOR VCC SELECT Gnd R2 C3 Package Specification PACKAGE DIMENSIONS IN mm (INCHES) PACKAGE THERMAL DATA D Lead Count 8L PDIP Metric Max Min 10.16 9.02 English Max Min .400 .355 Thermal Data RQJC RQJA typ typ 8 Lead PDIP 52 100 uC/W uC/W Plastic DIP (N); 300 mil wide 7.11 (.280) 6.10 (.240) 8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115) 1.77 (.070) 1.14 (.045) 2.54 (.100) BSC .356 (.014) .203 (.008) 0.39 (.015) MIN. .558 (.022) .356 (.014) Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same. REF: JEDEC MS-001 D Ordering Information Part Number CS8441XN8 Rev. 9/2/92 Description 8 Lead PDIP 4 Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. (c) 1999 Cherry Semiconductor Corporation |
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