AN44066A

DATA SHEET Part No. Package Code No. AN44066A SSOP032-P-0300B Publication date: July 2009 SDL00014AEB 1 AN44066A Contents Overview ……………………………………………………………………………………………………………. 3 Features ……………………………………………………………………………………………………………. 3 Applications ………………………………………………………………………………………………………… 3 Package ……………………………………………………………………………………………………………. 3 Type ………………………………………………………………………………………………………………… 3 Application Circuit Example ………………………………………………………………………………………. 4 Pin Descriptions ……………………………………………………………………………………………………. 5 Absolute Maximum Ratings ………………………………………………………………………………………. 6 Operating Supply Voltage Range ………………………………………………………………………………… 6 Allowable Current and Voltage Range …………………………………………………………………………... 7 Electrical Characteristics …………….…………………………………………………………………………… 8 Electrical Characteristics (Reference values for design) …………….…………………………………………. 10 Technical Data …………………………………………………………………………………………………….. 11 I/O block circuit diagrams and pin function descriptions ……………………………………………………… 11 Control mode ………………………………….………………………………………………………………….. 16 PD ⎯ Ta diagram …………………………………………………………………………………………………. 21 Usage Notes ………………………………………….……………………………………………………………. 22 Special attention and precaution in using ……………………………………………………………………… 22 Notes of Power LSI ………………………………………………………………………………………………. 23 SDL00014AEB 2 AN44066A AN44066A Driver IC for Stepping Motor Overview AN44066A is a two channels H-bridge driver IC. Bipolar stepping motor can be controlled by this single driver IC. 2-phase, half-step, 1-2 phase, W1-2 phase can be selected. Features 2-phase input control by rationalization of interface (2-phase excitation, half-step, and 1-2 phase excitation enabled) 4-phase input control (W1-2 phase excitation enabled) Built-in CR chopping (with frequency selected) Built-in standby function Built-in thermal protection and low voltage detection circuit Built-in 5 V power supply Applications IC for stepping motor drives Package 32 pin Plastic Shrink Small Outline Package (SSOP Type) Type Bi-CDMOS IC SDL00014AEB 3 AN44066A Application Circuit Example BC1 18 0.01 μF BC2 17 PHB1 26 IN0 IN3 30 IN2 29 SQ Gate Circuit CHARGE PUMP 16 VPUMP 0.01 μF 3 BOUT2 5 RCSB R VREFB 20 TJMON 32 PWMSW 24 VREFA 19 PWMSW BLANK S5VOUT 7 BOUT1 15 VM2 0.1 μF OSC TSD UVLO 47 μF 1 VM1 9 AOUT2 11 RCSA R IN1 28 IN0 27 ENABLEA 31 PHA1 25 STBY 22 S5VOUT 21 0.1 μF Reg IN2 Gate Circuit VM 23 GND 13 AOUT1 Note) This application circuit is shown as an example but does not guarantee the design for mass production set. SDL00014AEB QS 4 AN44066A Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Pin name VM1 N.C. BOUT2 N.C. RCSB N.C. BOUT1 N.C. AOUT2 N.C. RCSA N.C. AOUT1 N.C. VM2 VPUMP BC2 BC1 VREFA VREFB S5VOUT STBY GND PWMSW PHA1 PHB1 IN0 IN1 IN2 IN3 ENABLEA TJMON Type Power supply — Output — Input / Output — Output — Output — Input / Output — Output — Power supply Output Output Output Input Input Output Input Ground Input Input Input Input Input Input Input Input Output Motor power supply 1 N.C. Phase B motor drive output 2 N.C. Phase B current detection N.C. Phase B motor drive output 1 N.C. Phase A motor drive output 2 N.C. Phase A current detection N.C. Phase A motor drive output 1 N.C. Motor power supply 2 Charge Pump circuit output Charge Pump capacitor connection 2 Charge Pump capacitor connection 1 Phase A torque reference voltage input Phase B torque reference voltage input Internal reference voltage (5 V output) Standby setting Signal ground PWM frequency selection input Phase A phase selection input Phase B phase selection input Phase A output torque control 1 Phase A output torque control 2 Phase B output torque control 1 Phase B output torque control 2 Phase A/B start/stop signal input VBE monitor Description SDL00014AEB 5 AN44066A Absolute Maximum Ratings Note) Absolute maximum ratings are limit values which are not destructed, and are not the values to which operation is guaranteed. A No. 1 2 3 4 5 6 7 Parameter Supply voltage (Pin 1, 15) Power dissipation Operating ambient temperature Storage temperature Output pin voltage (Pin 3, 7, 9, 13) Motor drive current (Pin 3, 7, 9, 13) Flywheel diode current (Pin 3, 7, 9, 13) Symbol VM PD Topr Tstg VOUT IOUT If Rating 37 0.427 –20 to +70 –55 to +150 37 ±0.8 0.8 Unit V W °C °C V A A Note *1 *2 *3 *3 *4 *4 *4 Notes) *1 : The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. *2 : The power dissipation shown is the value at Ta = 70°C for the independent (unmounted) IC package without a heat sink. When using this IC, refer to the PD-Ta diagram of the package standard and design the heat radiation with sufficient margin so that the allowable value might not be exceeded based on the conditions of power supply voltage, load, and ambient temperature. *3 : Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C. *4 : Do not apply external currents or voltages to any pin not specifically mentioned. For the circuit currents, "+" denotes current flowing into the IC, and "−" denotes current flowing out of the IC. Operating Supply Voltage Range Parameter Operating supply voltage range Symbol VM Range 10.0 to 34.0 Unit V Note * Note) *: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. SDL00014AEB 6 AN44066A Allowed Voltage and Current Ranges Notes) Rating Voltage is voltage of pin on GND Do not apply current or voltage from outside to any pin not listed above. For the circuit currents, "+" denotes current flowing into the IC, and "−" denotes current flowing out of the IC. Pin No. 5 11 16 17 18 19 20 22 24 25 26 27 28 29 30 31 Pin name RCSB RCSA VPUMP BC2 BC1 VREFA VREFB STBY PWMSW PHA1 PHB1 IN0 IN1 IN2 IN3 ENABLEA Rating 2.5 2.5 (VM – 1) to 43 (VM – 1) to 43 VM + 0.3 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 –0.3 to 6 Unit V V V V V V V V V V V V V V V V Note — — *1 *1 *1 — — — — — — — — — — — Pin No. 21 Pin name S5VOUT Rating –5 to 0 Unit mA Note *1 *2 Notes) *1 : Do not apply external voltages to this pin. Set not to exceed allowable range at any time. *2 : This is the rating under the condition that VM is used in the range between 16 V and 34 V. When VM is used in the range between 10 V and 16 V, the rating is –1.4 mA to 0. SDL00014AEB 7 AN44066A Electrical Characteristics at VM = 24 V Note) Ta = 25°C±2°C unless otherwise specified. B No. Power Block 1 2 3 4 5 6 Parameter Symbol Conditions Limits Min Typ Max Unit Note High-level output saturation voltage Low-level output saturation voltage Flywheel diode forward voltage Output leakage current Supply current (at when only control system and charge Pump circuit are ON) Supply current (at standby mode) VOH VOL VDI ILEAK IM ISTBY VINH VINL IINH IINL VPHAH VPHBH VPHAL VPHBL IPHAH IPHBH IPHAL IPHBL VENABLEAH VENABLEAL IENABLEAH IENABLEAL VPWMSWH VPWMSWL IPWMSWH IPWMSWL VSTBYH VSTBYL ISTBYH ISTBYL IIN = –0.5 A IIN = 0.5 A IIN = ±0.5 A VM = 37 V, VRCS = 0 V ENABLEA = 3.3 V STBY = 0 V STBY = 2.1 V VM – 0.47 — 0.5 — — — VM – 0.31 0.47 1.0 10 5.4 120 — 0.71 1.5 20 8.2 190 V V V μA mA μA V V μA μA V V μA μA V V μA μA V V μA μA V V μA μA — — — — — — I/O Block 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 High-level IN input voltage Low-level IN input voltage High-level IN input current Low-level IN input current High-level PHA1/PHB1 input voltage Low-level PHA1/PHB1 input voltage High-level PHA1/PHB1 input current Low-level PHA1/PHB1 input current High-level ENABLEA input voltage Low-level ENABLEA input voltage High-level ENABLEA input current Low-level ENABLEA input current High-level PWMSW input voltage Low-level PWMSW input voltage High-level PWMSW input current Low-level PWMSW input current High-level STBY input voltage Low-level STBY input voltage High-level STBY input current Low-level STBY input current 2.2 0 IN0 = IN1 = IN2 = IN3 = 5 V IN0 = IN1 = IN2 = IN3 = 0 V –10 –15 2.2 0 PHA1 = PHB1 = 3.3 V PHA1 = PHB1 = 0 V 16.5 –15 2.2 0 ENABLEA = 5 V ENABLEA = 0 V –10 –15 2.2 0 PWMSW = 3.3 V PWMSW = 0 V 8 –15 2.1 0 STBY = 5 V STBY = 0 V — –2 — — ― ― — — 33 ― — — ― ― — — 16.5 ― — — 30 ― 5.5 0.6 10 15 5.5 0.6 66 15 5.5 0.6 10 15 5.5 0.6 33 15 5.5 0.6 45 2 — — — — — — — — — — — — — — — — — — — — SDL00014AEB 8 AN44066A Electrical Characteristics (continued) at VM = 24 V Note) Ta = 25°C±2°C unless otherwise specified. B No. Parameter Symbol Conditions Limits Min Typ Max Unit Note Torque Control Block 27 28 29 30 31 Input bias current PWM frequency1 PWM frequency2 Pulse blanking time Comp threshold H (100%) IREFA IREFB fPWM1 fPWM2 TB VTH VREFA = 5 V VREFB = 5 V PWMSW = 0.6 V PWMSW = 2.2 V VREFA = VREFB = 0 V VREFA = VREFB = 3.3 V IN0 = IN1 = 0.6 V IN2 = IN3 = 0.6 V VREFA = VREFB = 3.3 V IN0 = 2.2 V, IN1 = 0.6 V IN2 = 2.2 V, IN3 = 0.6 V VREFA = VREFB = 3.3 V IN0 = 0.6 V, IN1 = 2.2 V IN2 = 0.6 V, IN3 = 2.2 V 83.3 34 17 0.38 627 100 52 26 0.75 660 125 70 35 1.12 693 μA kHz kHz μs mV — — — — — 32 Comp threshold C (67%) VTC 410 440 470 mV — 33 Comp threshold L (33%) VTL 200 220 240 mV — Reference Voltage Block 34 35 Reference voltage Output impedance VS5VOUT ZS5VOUT IS5VOUT = 0 mA IS5VOUT = –1.5 mA, –3.5 mA 4.5 — 5.0 18 5.5 27 V Ω — — SDL00014AEB 9 AN44066A Electrical Characteristics (Reference values for design) at VM = 24 V Notes) Ta = 25°C±2°C unless otherwise specified. The characteristics listed below are reference values derived from the design of the IC and are not guaranteed by inspection. If a problem does occur related to these characteristics, we will respond in good faith to user concerns. B No. Output Drivers 36 37 38 Parameter Symbol Conditions Reference values Min Typ Max Unit Note Output slew rate 1 Output slew rate 2 Dead time VTr VTf TD Output voltage rising edge Output voltage falling edge — — — 270 330 2.8 — — — V/μs V/μs μs — — — Thermal Protection 39 40 Thermal protection operating temperature Thermal protection hysteresis width TSDon ΔTSD ZVREFA ZVREFB — VREFA = 5 V VREFB = 5 V — — 150 40 — — ºC ºC — — VREF Block 41 42 Input impedance Input impedance precision 40 –20 50 — 60 20 kΩ % — — I/O Block 43 44 High-level PHA1/PHB1 input current 2 High-level PWMSW input current 2 IPHAH2 IPHBH2 IPWMSWH2 PHA1 = PHB1 = 5 V PWMSW = 5 V — — 68 42 — — μA μA *1 *1 Note) *1 : Refer to the “Usage Notes” (P.35) for the input current characteristics about PHA1, PHB1, PWMSW. SDL00014AEB 10 AN44066A Technical Data Circuit diagrams of the input/output part and pin function descriptions Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Pin No. Waveform and voltage Internal circuit 16 Impedance Description 3k 3 5 7 9 11 13 3k Pin3 BOUT2 7 BOUT1 9 AOUT2 13 AOUT1 Pin5 RCSB 11 RCSA Pin3 : Phase B motor drive output 2 5 : Phase B current detection 7 : Phase B motor drive output 1 9 : Phase A motor drive output 2 11 : Phase A current detection 13 : Phase A motor drive output 1 ― 100k ― 100k 4k 16 17 ― BC2 17 150k 125 VPUMP 16 ― Pin16 : Charge Pump circuit output 17 : Charge Pump capacitor connection 2 SDL00014AEB 11 AN44066A Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Pin No. Waveform and voltage Internal circuit Impedance Description 150 Pin18 : Charge Pump capacitor connection 1 18 ― 200 BC1 18 ― Pin19 VREFA 20 VREFB Pin19 : Phase A torque reference voltage input 20 : Phase B torque reference voltage input 19 20 ― 40k 50 kΩ 4k 3.98k 15.91k 10k SDL00014AEB 12 AN44066A Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Pin No. Waveform and voltage Internal circuit Impedance Description 21 ― 2k 102k Pin21 S5VOUT 21 ― Pin21 : Internal reference voltage (5 V output) Pin22 STBY 22 51.5k 22 ― 103k 154.5 kΩ Pin22 : Standby setting SDL00014AEB 13 AN44066A Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Pin No. Waveform and voltage Internal circuit Impedance Description Pin24 PWMSW 24 ― 4k 200 kΩ Pin24 : PWM frequency selection input 200k 50k Pin 25 PHA1 25 26 26 PHB1 ― 4k 100 kΩ Pin25 : Phase A phase selection input 26 : Phase B phase selection input 100k 50k SDL00014AEB 14 AN44066A Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Pin No. Waveform and voltage Internal circuit Impedance Description 27 28 29 30 31 Pin27 IN0 28 IN1 29 IN2 30 IN3 31 ENABLEA ― 4k ― 100k Pin27 : Phase A output torque control 1 28 : Phase A output torque control 2 29 : Phase B output torque control 1 30 : Phase B output torque control 2 31 : Phase A/B start/stop signal input 32 ― 32 800 ― Pin32 : VBE monitor Pin32 TJMON S5VOUT (Pin21) VM(Pin1, Pin15) Sym bols ― Diode Zener diode Ground ― ― SDL00014AEB 15 AN44066A Technical Data Control mode 1. Truth table 1) Control/Charge pump circuit STBY High Low Low 2) Output polarity ENABLEA Low Low High PHA1/PHB1 High Low — AOUT1/BOUT1 High Low OFF AOUT2/BOUT2 Low High OFF ENABLE — High Low Control/Charge pump circuit Output transistor OFF OFF ON OFF ON ON 3) Output current of 2-phase excitation / half step / 1-2 phase excitation IN0 Low High Low High IN2 Low Low High High A-ch. Output Current (VREF / 5) × (1 / Rs) 0 (VREF / 5) × (1 / Rs) B-ch. Output Current (VREF / 5) × (1 / Rs) (VREF / 5) × (1 / Rs) 0 Notes) Rs : current detection region IN1 = IN3 = Low level (VREF / 5) × (1 / Rs) × (2 / 3) (VREF / 5) × (1 / Rs) × (2 / 3) 4) Output current of W1-2 phase excitation A-ch. output IN0 Low Low High Low High B-ch. output IN0 Low Low High Low High IN2 Low Low Low High High IN3 Low High Low Don't care Low B-ch. Output Current (VREF / 5) × (1 / Rs) (VREF / 5) × (1 / Rs) × (1 / 3) (VREF / 5) × (1 / Rs) 0 (VREF / 5) × (1 / Rs) × (2 / 3) SDL00014AEB IN2 Low Low Low High High IN1 Low High Don't care Low Low A-ch. Output Current (VREF / 5) × (1 / Rs) (VREF / 5) × (1 / Rs) × (1 / 3) 0 (VREF / 5) × (1 / Rs) (VREF / 5) × (1 / Rs) × (2 / 3) Note) Rs : current detection region Note) Rs : current detection region 16 AN44066A Technical Data (continued) Control mode (continued) 2. Output wave 1) Drive of 2-phase excitation (4steps sequence) (IN0 to IN3 = Low) 1 2 3 4 1 2 3 4 VPHA1 VPHA1 VPHB1 VPHB1 A-ch. Motor current flow-in flow-out A-ch. Motor current flow-in flow-out B-ch. Motor current B-ch. Motor current FWD flow-in flow-out flow-in flow-out REV SDL00014AEB 17 AN44066A Technical Data (continued) Control mode (continued) 2. Output wave (continued) 2) Drive of half step (8-steps sequence) (IN1 = IN3 = Low) (Ex.) 12345678 12345678 VPHA1 VPHB1 VPHA1 VPHB1 VIN0 VIN0 VIN2 VIN2 A-ch. Motor current flow-in flow-out A-ch. Motor current flow-in FWD REV flow-in B-ch. Motor current flow-out B-ch. Motor current flow-out flow-in flow-out REV FWD SDL00014AEB 18 AN44066A Technical Data (continued) Control mode (continued) 2. Output wave (continued) 3) Drive of 1-2 phase excitation (8-steps sequence) (IN1 = IN3 = Low) (Ex.) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 VPHA1 VPHB1 VIN0 VPHA1 VPHB1 VIN0 VIN2 VIN2 A-ch. Motor current flow-in flow-out A-ch. Motor current flow-in flow-in B-ch. Motor current flow-out B-ch. Motor current flow-out flow-in flow-out FWD REV REV FWD SDL00014AEB 19 AN44066A Technical Data (continued) Control mode (continued) 2. Output wave (continued) 4) Drive of W1-2 phase excitation (16-steps sequence) 1 2 3 4 5 6 7 8 9 101112 13 1415 16 1 2 3 4 5 6 7 8 9 1011 12 131415 16 VPHA1 VPHB1 VIN0 VIN1 VIN2 VIN3 VPHA1 VPHB1 VIN0 VIN1 VIN2 VIN3 A-ch. Motor current flow-in flow-out A-ch. Motor current B-ch. Motor current B-ch. Motor current FWD REV flow-in flow-out flow-in flow-out flow-in flow-out REV FWD SDL00014AEB 20 AN44066A Technical Data (continued) PD ⎯ Ta diagram SDL00014AEB 21 AN44066A Usage Notes Special attention and precaution in using 1. This IC is intended to be used for general electronic equipment and driving stepping motor. Consult our sales staff in advance for information on the following applications: Special applications in which exceptional quality and reliability are required, or if the failure or malfunction of this IC may directly jeopardize life or harm the human body. Any applications other than the standard applications intended. (1) Space appliance (such as artificial satellite, and rocket) (2) Traffic control equipment (such as for automobile, airplane, train, and ship) (3) Medical equipment for life support (4) Submarine transponder (5) Control equipment for power plant (6) Disaster prevention and security device (7) Weapon (8) Others : Applications of which reliability equivalent to (1) to (7) is required 2. Pay attention to the direction of LSI. When mounting it in the wrong direction onto the PCB (printed-circuit-board), it might smoke or ignite. 3. Pay attention in the PCB (printed-circuit-board) pattern layout in order to prevent damage due to short circuit between pins. In addition, refer to the Pin Description for the pin configuration. 4. Perform a visual inspection on the PCB before applying power, otherwise damage might happen due to problems such as a solderbridge between the pins of the semiconductor device. Also, perform a full technical verification on the assembly quality, because the same damage possibly can happen due to conductive substances, such as solder ball, that adhere to the LSI during transportation. 5. Take notice in the use of this product that it might break or occasionally smoke when an abnormal state occurs such as output pinVM short (Power supply fault), output pin-GND short (Ground fault), or output-to-output-pin short (load short) . And, safety measures such as an installation of fuses are recommended because the extent of the above-mentioned damage and smoke emission will depend on the current capability of the power supply. Pay special attention to the following pins so that they are not short-circuited with the VM pin, ground pin, other output pin, or current detection pin. (1) AOUT1 (Pin 13), AOUT2 (Pin 9), BOUT1 (Pin 7), BOUT2 (Pin 3) (2) BC2 (Pin 17), VPUMP (Pin 16) (3) VM1 (Pin 1), VM2 (Pin 15), S5VOUT(Pin 21) (4) RCSA (Pin 11), RCSB (Pin 5) The higher the current capacity of power supply is, the higher the possibility of the above destruction or smoke generation. Therefore, it is recommended to take safety countermeasures, such as the use of a fuse. 6. When using the LSI for new models, verify the safety including the long-term reliability for each product. 7. When the application system is designed by using this LSI, be sure to confirm notes in this book. Be sure to read the notes to descriptions and the usage notes in the book. SDL00014AEB 22 AN44066A Usage Notes (continued) Notes of Power LSI 1. Perform thermal design work with consideration of a sufficient margin to keep the power dissipation based on supply voltage, load, and ambient temperature conditions. (The IC is recommended that junctions are designed below 70% to 80% of Absolute Maximum Rating.) 2. The protection circuit is incorporated for the purpose of securing safety if the IC malfunctions. Therefore, design the protection circuit so that the protection circuit will not operate under normal operating conditions. The temperature protection circuit, in particular, may be destructed before the temperature protection circuit operates if the area of safety operation of the device or the maximum rating is exceeded instantaneously due to the short-circuiting between the output pin and VM pin or a ground fault caused by the output pin and ground pin. 3. Unless specified in the product specifications, make sure that negative voltage or excessive voltage are not applied to the pins because the device might be damaged, which could happen due to negative voltage or excessive voltage generated during the ON and OFF timing when the inductive load of a motor coil or actuator coils of optical pick-up is being driven. 4. The product which has specified ASO (Area of Safe Operation) should be operated in ASO. 5. Verify the risks which might be caused by the malfunctions of external components. 6. Set the value of the capacitor between the VPUMP and GND pins so that the voltage on the VPUMP (Pin 16) will not exceed 43 V in any case regardless of whether it is a transient phenomenon or not while the motor standing by is started. 7. This IC employs a PWM drive method that switches the high-current output of the output transistor. Therefore, the IC is apt to generate noise that may cause the IC to malfunction or have fatal damage. To prevent these problems, the power supply must be stable enough. Therefore, the capacitance between the S5VOUT and GND pins must be 0.1 μF and the one for power supply stabilization between the VM and GND pins must be a minimum of 47 μF (recommendation) and as close as possible to the IC so that PWM noise will not cause the IC to malfunction or have fatal damage. SDL00014AEB 23 AN44066A Usage Notes (continued) 8. Pulse blanking time In order to prevent mistakes in current detection resulting noise, this IC is provided with a pulse blanking time of 0.75 μs (typ.). The motor current will not be less than the current determined by the pulse blanking time. Pay utmost attention at the time of minute current control. Fig.1 shows the relationship between the pulse blanking time and minimum current value. The increase or decrease in the motor current is determined by a load and a resistance of a internal winding in the motor, induced voltage, and PWM on-duty. Set current Normal operation The set current is less than the minimum current. TB 1/fPWM Minimum current Set current Fig. 1 RCS current waveform fPWM : PWM frequency TB : Pulse blanking time (Refer to No. 28 to No. 30 of Electrical Characteristics) 9. VREF voltage When VREF voltage is set to lower, an error detection of motor current might be caused by noise because Comp threshold voltage (No.31, 32, 33 in the “Electrical Characteristics” / P.10) becomes low. Use this IC after confirming there is no error detection when VREF voltage is less than the set value. 10. Notes on the interface Absolute maximum ratings of Pin 19, 20, 22 and Pin 24 to Pin31 are –0.3 V to 6 V. When the current setting for a motor is large and the lead line of GND is long, the potential of GND in this LSI will rise. Take notice that there is a possibility that potential of the interface pin is negative compared with that of GND in this LSI even if 0 V is applied to the interface pin. At that time, pay attention so that the input voltage of these pins might not exceed the values which are set in the allowable voltage range. SDL00014AEB 24 AN44066A Usage Notes (continued) 11. Notes at the clear of standby mode / the rise of VM supply In this LSI, all phases are forced OFF for about 300 μs (typ.) after the clear of standby mode or the rise of VM supply. (See the following figure.) This is why the operation mode can be started after the charge pump circuit voltage boosts efficiently at shift to operation mode from standby mode / VM supply = OFF, when the charge pump operation stops. Therefore, the excitation patterns input after the forced all phase OFF period are effect. When the charge pump circuit rises slowly owing to that the capacitance value between VPUMP-GND is made large etc. and the booster voltage cannot rise efficiently for the forced all phase OFF, the IC might overheat. In this case, clear the standby mode at ENABLE = High or restart after VM supply is turned ON, the booster voltage rises efficiently, and ENABLE is shifted to Low. The thermal protection is same operation as that at VM supply OFF. [In case that standby mode is cleared] STBY High Low Standby Standby Standby mode clear Motor output All phase OFF Forced all phase OFF About 300 μs(typ) Start-up (at ENABLE = Low) All phase OFF (at ENABLE = High) [In case that VM supply rises] After VM supply exceeds threshold VM = 8.8 V(typ), all phases are forced OFF for about 300 μs(typ). VM Low High Motor output All phase OFF (Low voltage protection) Forced all phase OFF Start-up (at ENABLE = Low) All phase OFF (at ENABLE = High) About 300 μs(typ) SDL00014AEB 25 AN44066A Usage Notes (continued) 12. PWMSW, PHA1, PHB1 pins Under conditions where VM power supply is shutdown in standby mode (STBY pin = High level), when applying approx. 0.7 V (TYP) or more to PWMSW (Pin 24), PHA1 (Pin 25), PHB1 (Pin 26), the current flows into above-mentioned pins owing to parasitic elements in the LSI and the current flowing into the above-mentioned pins varies from the current determined by pull down resistance. In addition, the current flowing into PHA1/PHA2 is 341.4 μA (impedance = approx. 9.1 kΩ) at 3.3 V, while that into PWMSW is 323.2 μA (impedance = approx. 9.7 kΩ) at 3.3 V. There is no problem that the voltage up to rating is applied to the above-mentioned pins. However, it is recommended to set the voltage applied to the above-mentioned to 0.7 V or less at shutdown of VM power supply in standby mode. Also, in case of the voltage of above-mentioned pins > S5VOUT(Pin 21) – 0.2 V at power on to VM power supply, the current flows owing to parasitic elements in the LSI, and the current flowing into the above-mentioned pins varies (refer to Fig. 2, 3). As the same as at standby, there is no problem that the voltage up to rating is applied to the above-mentioned pins. However, it is recommended to set the voltage applied to the above-mentioned pins to 4.3 V or less. PHA1/PHB1 current [μA] PHA1/PHB1電流[uA] 400 300 200 100 0 0 1 2 3 4 5 6 PHA1/PHB1=4.3V _____ PHA1/PHB1 voltage [V] Z = 200 kΩ Z =≅ 4.7 kΩ Z 約4.7 kΩ S5VOUT = 4.5 V S5VOUT = 5.0 V S5VOUT = 5.5 V Fig. 2 Input impedance of PHA1/PHB1 at VM power supply power on PWMSW current [μA] PWMSW電流[uA] 400 350 300 250 200 150 100 50 0 0 1 3 4 5 PWMSW=4.3V PWMSW電圧[V] PWMSW voltage [V] 2 S5VOUT = 4.5 V S5VOUT = 5.0 V S5VOUT = 5.5 V Z = 200 kΩ Z = 約4.7kΩ Z ≅ 4.7 kΩ 6 Fig. 3 Input impedance of PWMSW at VM power supply power on SDL00014AEB 26 AN44066A Usage Notes (continued) 13. In the case of measuring the chip temperature of the IC, measure the voltage of TJMON (Pin 32) and presume chip temperature from following data. Use the following data as reference data. Before applying the IC to a product, conduct a sufficient reliability test of the IC along with the evaluation of the product with the IC incorporated. The temperature characteristic of TJMON VBE[V] ΔVBE / Δtemp = –1.82 [mV / °C] 0 150 Temp[°C] 14. Power supply start up speed and shutdown speed Set the rising speed to 0.1 V/μs or less for VM voltage at power on to VM (Pin 1, 15). It is recommended that the falling speed of VM voltage is set to 0.1 V/μs or less on condition of STBY = High or ENABLE = High at shutdown. In case of shutdown at motor drive (STBY = Low and ENABLE = Low), the motor current might flow back to the power supply and supply voltage might not fall stably. If the rising or falling speed of power supply is too high, which might cause malfunctions or destruction on the IC. In this case, perform the long-term reliability test and confirm the sufficient evaluation for products. Power Supply VM Rising edge every 0.1 V/μs or less Falling edge every 0.1 V/μs or less time SDL00014AEB 27 AN44066A Usage Notes (continued) 15. RCS line Take consideration in the following figure and the points and design PCB pattern. (1) Point 1 Design so that the wiring to the current detection pins of this IC (RCSA, RCSB) should be thick and short in order to lower the impedance. This is why the current cannot be detected correctly owing to the wiring impedance, and the current might not be supplied to a motor sufficiently. (2) Point 2 Design so that the wiring between the current detection resistor and the connector GND (Point 2 in the following figure) should be thick and short in order to lower the impedance. As the same as Point 1, a sufficient current might not be supplied due to the wiring impedance. In addition, if there is a common impedance between GND and RCSA or RCSB, a peak detection may be detected by mistake. Therefore, connect the wiring between GND and RCSA or RCSB independently. (3) Point 3 Connect the GND of this IC to the connector on PCB independently. Separate the wiring which is a large current line (Point 2) from that of GND, and make these wirings with one-point shorted at the connector as the following figure. That can minimize the fluctuation of GND. Point 2 Connector GND Current limit detection resister (A) RCSA/RCSB IC Point 3 GND Point 1 Motor 16. A high current flows into this IC. Therefore, the common impedance of the PCB pattern cannot be ignored. Take the following points into consideration and design the PCB pattern of the motor. A high current flows into the line between the VM1 (Pin 1) and VM2 (Pin 15) pins. Therefore, noise is generated with ease at the time of switching due to the inductance (L) of the line, which may result in the malfunctioning or destruction of the IC. (Fig. 4) As shown in the circuit diagram on the right-hand side, the escape way of the noise is secured by connecting a capacitor to the connector close to the VM pin of the IC. This makes it possible to suppress the direct VM pin voltage of the IC. Make the settings as shown in the circuit diagram on Fig. 5 as much as possible. Low spike amplitude due to the capacitance between the VM pin and ground pin VM L VM IC C RCS GND VM L VM IC C RCS GND GND GND Fig. 4 Deprecated PCB SDL00014AEB Fig. 5 Recommended PCB 28 Request for your special attention and precautions in using the technical information and semiconductors described in this book (1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and regulations of the exporting country, especially, those with regard to security export control, must be observed. (2) The technical information described in this book is intended only to show the main characteristics and application circuit examples of the products. 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Consult our sales staff in advance for information on the following applications: – Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. – Any applications other than the standard applications intended. (4) The products and product specifications described in this book are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions (operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products. 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