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CS8441 Stepper Motor Driver with Divide by Select
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 85 mA 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 “short circuit protection.” This function will protect the part in the case of a shorted or partially shorted load. The second protection function is the “overvoltage function.” This function monitors the level of the supply voltage. In transient conditions such as load dump, the part will shut down, protecting itself. Features • No Cross–Conduction in Either H–Bridge • Divide by 1 and Divide by 2 Modes • Guaranteed Monotonic • On–Chip Flyback Diodes • Fault Protection – Overvoltage – Load Dump Protection to 60 V
VCC Input Comp. Coil Driver A COILA+ COILA–
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DIP–8 N SUFFIX CASE 626
PIN CONNECTIONS AND MARKING DIAGRAM
1 CS8441YN8 AWL YYWW GND COILA+ COILA– SENSOR A WL, L YY, Y WW, W 8 VCC COILB+ COILB– SELECT
= Assembly Location = Wafer Lot = Year = Work Week
ORDERING INFORMATION
Device CS8441YN8 Package DIP–8 Shipping 50 Units/Rail
SENSOR
Sequencer
Overvoltage and Short Circuit Protection
SELECT
B1 B2 Coil Driver B COILB+ COILB–
GND
Figure 1. Block Diagram
© Semiconductor Components Industries, LLC, 2001
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February, 2001 – Rev. 3
Publication Order Number: CS8441/D
CS8441
ABSOLUTE MAXIMUM RATINGS*
Rating Supply Voltage (VCC) (Note 1.): Input Voltage (VIN) Storage Temperature Range (TSTG) Junction Temperature Range ESD (Human Body Model) Lead Temperature Soldering: 1. –40°C to +125°C. 2. 10 second maximum. *The maximum package power dissipation must be observed. Wave Solder: (through hole styles only) (Note 2.) Continuous 100 ms Pulse Transient Value –0.5 to 24 –0.5 to 60 –0.3 to VCC + 0.3 –65 to 150 –40 to 150 2.0 260 peak Unit V V V °C °C kV °C
ELECTRICAL CHARACTERISTICS (–40°C ≤ TA ≤ 125°C, 6.5 V ≤ VCC ≤ 15.5 V; unless otherwise stated. All voltage
shall be referenced to GND unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16 V.) Characteristic Supply, VCC Supply Voltage Range –40°C ≤ TA ≤ 125°C –40°C ≤ TA ≤ 25°C Transient Pulse, 100 ms VCC = 15.5 VDC, Outputs not loaded. – 6.5 6.5 – – 16 – – – 24 – 15.5 24 35 35 23 VDC VDC VDC mA V Test Conditions Min Typ Max Unit
Supply Current Overvoltage Shutdown Speed Sensor Input, SENSOR Input Frequency Range Switching Threshold Hysteresis Input Bias Current Input Voltage Range Operating Input Voltage Input Clamp Current Divider Select Input, SELECT Logic 0 Input Voltage Logic 1 Input Voltage Logic 0 Input Current Logic 1 Input Current Coil Output Drivers Coil Load Coil Inductance Coil Resistance Temperature Energized Coil Voltage (Note 3.) (Both Polarities) A and B
– – – 0.8 VDC ≤ VIN ≤ VCC – 10 kΩ Resistor in Series I Clamp at VIN = 0 VDC
– 1.2 300 – 0 – –
0.2 – 500 0.1 – – –0.4
1.0 2.4 – ±1.0 VCC –15 to VCC –5.0
kHz VDC mVDC µA VDC VDC mA
– – 0 V ≤ VIN ≤ 100 mV 3.0 V ≤ VIN ≤ 15.5 VDC
– 3.0 – –
– – –1.0 0.75
100 VCC –100 2.0
mVDC VDC µA mA
+25°C – Coefficient VCC = 6.5 VDC VCC = 10 VDC VCC = 15.5 VDC, –20°C ≤ TA ≤ 125°C VCC = 15.5 VDC, –40°C ≤ TA ≤ –20°C –
198 – – VCC – 1.5 V VCC – 1.6 V VCC – 1.75 V VCC – 2.0 V –
210 80 – VCC – 0.9 V VCC – 1.0 V VCC – 1.1 V VCC – 1.2 V –
222 – 0.35 – – – – ±100
Ω mH %/°C VDC VDC VDC VDC µA
De–energized Coil Leakage Current
3. Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
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CS8441
ELECTRICAL CHARACTERISTICS (continued) (–40°C ≤ TA ≤ 125°C, 6.5 V ≤ VCC ≤ 15.5 V; unless otherwise stated. All voltage shall be referenced to GND unless otherwise noted. Overvoltage shutdown of coils occurs when VCC > 16 V.)
Characteristic Short Circuit Protection Short Circuit Threshold I Coil A + I Coil B Short Circuit Turn–Off Delay – – – – 275 5.0 400 – mA µs Test Conditions Min Typ Max Unit
PACKAGE PIN DESCRIPTION
PACKAGE PIN # DIP–8 1 2 3 4 5 6 7 8 PIN SYMBOL GND COILA+ COILA– SENSOR SELECT COILB– COILB+ 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 .