M54640P Stepper Motor Driver REJ03F0042-0100Z Rev.1.0 Sep.19.2003 Description The M54640P is a semiconductor IC to drive a stepper motor by the bipolar method. Features • • • • • • Bipolar and constant-current drive Wide current control rage (20 – 800mA) Wide supply voltage drive range (10 – 40V) Built in flywheel diodes Current level can be changed by steps or continuously. Built in a thermal shutdown circuit Application Printer, FDD, HDD, Fax Function The M54640P drives a stepper motor by the bipolar drive method to change the current direction of a single coil and controls the current direction with PHASE input pin. In order to obtain higher efficiency, the constant current drive system to control the coil current is introduced. The current value can be selected among four levels (0 to max.) by selecting the combination of three internal comparators by logic input. It also can be continuously changed by controlling the reference voltage. Conversion to voltage is conducted by the current value sensing resistor (Rs) and the voltage is sensed with each comparator, and then each comparator output triggers monomulti and the current is cut for a certain time (tOFF) by utilizing the inductance of the coil. Also, diodes needed for choppering and a thermal shutdown circuit as a countermeasure against overvoltage are built in this circuit. Pin Configuration 4 GND 5 Power supply VCC Output current value setting Output current direction switching I1 M54640P Output MB ← 1 One-shot-multi T→ 2 time constant Output power VMM 3 supply 16 → E Current sensor 15 → MA Output 14 13 GND 12 6 11 ← VR 7 10 ← C Ph → 8 9 Outline 16P4 Rev.1.0, Sep.19.2003, page 1 of 9 power VMM Output supply Io Comparator reference input Comparator input Output current setting M54640P Block Diagram Comparator reference input VCC VR 11 6 Output MA 15 1 Output MB Schmitt trigger Cutput current Ph 8 direction switcing 1 1 1 >1 >1 3 VMM 14 Output power supply I1 7 Output current value setting I0 9 00 10 01 11 VKH VKM Monostable tOFF = 0.69 • RT CT VKL 4 GND Current sensor 5 12 13 10 2 C Comparator input T One-shot-multi time constant 1 6 E Current sensor Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted.) Parameter Symbol Ratings Unit Supply voltage VCC −0.3 to 7 V Output supply voltage Logic input voltage VMM VL −0.3 to 45 −0.3 to 6 V V Analog input voltage Comparative input voltage VC VR −0.3 to Vcc −0.3 to 15 V V Logic input current Analog input current IL IC −10 −10 mA mA Output supply current Power dissipation IMM Pd ±1000 1.92 mA W Operating temperature Storage temperature Topr Tstg −20 to 75 −55 to 125 °C °C Conditions Mounted on a board Note : Every voltage value is measured when the voltage at GND pin is 0V. The maximum and the minimum of each voltage value are shown in absolute values. Regarding current directions, inflow current is shown in a positive value and outflow current is shown in a negative value. The maximum and the minimum of each current value are shown in absolute values. Rev.1.0, Sep.19.2003, page 2 of 9 M54640P Recommended Operating Condition (Ta = 25°C, unless otherwise noted.) Limits Parameter Symbol Min. Typ. Max. Unit Supply voltage Output supply voltage VCC VMM 4.75 10 5 5.25 40 V V Output current Logic input rise time IO tPLH 20 800 2 mA µS Logic input fall time Thermal shutdown temperature tPHL TON 2 µS °C 175 Electrical characteristics (Ta = 25°C, VCC = 5.0V, unless otherwise noted.) Limits Parameter Typ. Max. Unit Test conditions 2.0 VCC V VCC=5V 0 400 430 0.8 450 mV VCM VCL 240 75 260 90 280 100 Comparator input current Output cutoff current ICO IOFF −20 Saturation voltage Vsat Cutoff time tOFF Turnoff delay Supply current td ICC Logic input voltage Symbol Min. “H” VIH “L” VIL VCH Comparator threshold Logic input current “H” “L” IIH IIL Rev.1.0, Sep.19.2003, page 3 of 9 25 VR=5V, I0=I1=0 VR=5V, I0=1,I1=0 VR=5V, I0=0, I1=1 20 100 µA µA 4.0 V 30 35 µS The voltage at the sensing resistor is not included. IO=500mA VMM=10V, tON ≥ 5µs 1.6 2.0 25 µS mA Ta=25°C, dVK/dt ≥ 50mV/µs VCC=5V 20 −0.4 µA mA VI=2.4V VI=0.4V I0=I1=1(Ta=25°C) M54640P Switching Characteristics Test Circuit CT 1 MB E 16 MA 15 2 T VMM 14 3 VMM RT 4 RS CV VCC 13 GND GND 12 5 RC VR 11 6 VCC 7 I1 C 10 8 Phase I0 CC 9 RS :1Ω RC : 1kΩ RT : 56kΩ CC : 820pF CT : 820pF CV : 47µF Switching Waveforms VMA – VMB or VMB – VMA tOFF = 0.69RTCT 1 1/2 tON tOFF td VCH VCM VCL Rev.1.0, Sep.19.2003, page 4 of 9 M54640P Application Description • PHASE INPUT Phase input decides the output mode. Phase MA MB H H L L L H • I0, I1 I0 and I1 fixed based on the comparison voltage VR decide the output current level. The current level can be continuously changed by changing the voltage at VR continuously. I0 I1 Current level H L H H 0 Low H L L L Average High • Current sensor When the voltage fall at the current sensing resistor and the selected current level becomes of the same level, the comparator triggers the monostable. Then, the output stage is cut off for a certain time (tOFF). During this cutoff time, the current volume decreases slightly and falls short of the comparison level. After the cutoff time (tOFF), the output stage is in ON state again. This operation is repeated. • Single pulse generator At the comparator output rise edge, the monostable is triggered. The pulse width of the monostable at the external timing Rt and Ct is as follows. tOFF = 0.69 x RtCt Retrigger during tOFF is neglected. • Analog control The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the comparator. Rev.1.0, Sep.19.2003, page 5 of 9 M54640P Timing Chart 2-phase excitation Phase A Phase B I0, 1 = (A) = 0 I0, 1 = (B) = 0 1-2-phase excitation Phase A Phase B I0, 1 = (A) I0, 1 = (B) Microstep (divided into six) Phase A Phase B I0 (A) I1 (A) I0 (B) I1 (B) Rev.1.0, Sep.19.2003, page 6 of 9 M54640P Typical Characteristics (Absolute maximum ratings) Safety operating temperature 1.0 A : Recommended Output current Io (A) 0.8 B : Schottky diodes should be externally connected between output pins and power supply pins. B 0.6 C : Schottky diodes should be externally instaalled between output pins and power supply pins and between output pins and GND pin. 0.4 C A 0.2 0 0 10 20 30 40 45 50 Output VMM (V) Thermal derating 10.0 Allowable power dissipation (W) θj-c = 10°C/W A : Mounted on a 25cm2 glass epoxy board which is coated with copper on one side. θc-a = 45°C/W B : 10cm2 aluminum heat sink (1t) is used. θc-a = 25°C/W C : 100cm2 aluminum heat sink (1t) is used. θc-a = 10°C/W Tj(max) = 150°C 8.0 6.0 C 4.0 B A 2.0 0 0 25 50 Ambient (°C) Rev.1.0, Sep.19.2003, page 7 of 9 75 100 M54640P Application Example 1Ω 820pF 1kΩ 16 15 14 13 12 5V 11 10 9 6 8 M54640P 1 2 3 4 5 7 820pF Phase A 56kΩ I0A I1A 1Ω 820pF 1kΩ 24V 47µF 16 15 14 13 12 11 10 9 Stepper motor M54640P 1 2 3 820pF 4 5 6 7 8 Phase B I0B 56kΩ I1B Precautions for use (1) When the whole output current changes by a large margin (for example, when overheat protection operation causes intermittent flow of output current), the supply voltage may undergo a change. Therefore, selection and wiring of power supply should be conducted cautiously to avoid such a situation that the supply voltage exceeds the absolute maximum ratings. (2) When the supply voltage changes by a large margin, the operation of this IC may become unstable. In this case, the change of supply voltage can be controlled by connecting a capacitor at the point near to IC pin between Vcc pin and GND pin. (See above application example.) (3) Thermal shutdown function • The state of thermal shutdown operation may differ according to the way of wiring within a board. Therefore, sufficient board evaluation should be conducted before use. When the board is changed, operation on the replacing board should be evaluated. • The circuit board on which this IC is mounted is designed to realize low impedance between power supply and output pin. Therefore, it is desirable to take a safe measure such as fixing a fuse to avoid such a situation that the board is damaged by a fire when output pin is internally short-circuited by excessively applied surge voltage by accident. Rev.1.0, Sep.19.2003, page 8 of 9 SEATING PLANE EIAJ Package Code DIP16-P-300-2.54 e D b 8 1 b2 Lead Material Alloy 42/Cu Alloy 9 Weight(g) 1.0 16 JEDEC Code — b1 A A1 A2 b b1 b2 c D E e e1 L Symbol Plastic 16pin 300mil DIP c MMP A L E A2 A1 Rev.1.0, Sep.19.2003, page 9 of 9 Dimension in Millimeters Min Nom Max — — 4.5 0.51 — — — 3.3 — 0.4 0.5 0.59 1.4 1.5 1.8 0.9 1.0 1.3 0.22 0.27 0.34 18.8 19.0 19.2 6.15 6.3 6.45 — 2.54 — — 7.62 — 3.0 — — 0˚ — 15˚ e1 16P4 M54640P Package Dimensions Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or (iii) prevention against any malfunction or mishap. Notes regarding these materials 1. These materials are intended as a reference to assist our customers in the selection of the Renesas Technology Corp. product best suited to the customer's application; they do not convey any license under any intellectual property rights, or any other rights, belonging to Renesas Technology Corp. or a third party. 2. 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