MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M56785FP is a semiconductor integrated circuit in order to drive the spindle motor. N.C 1 42 N.C S/S 2 41 W RDS 3 40 V FG 4 39 U CI 5 38 RS MODE2 6 37 MODE3 MODE1 7 36 MODE4 8 35 9 34 FEATURES 10 11 GND M56785FP ● Large power dissipation (Power Package). ● 3.3V DSP available. ● The supply voltage with wide range. ● High motor drive current . ● Low saturation voltage. (typical 1.2V at load current 500mA) ● Motor current control for both motor torque directions. ● Reverse torque mode select [SHORT BRAKING,etc]. ● Sleep mode. (Zero total current ) ● Hall amplifier sensitivity select. (Minimum voltage : 35mVp-p or 50mVp-p) ● FG signal output terminal. ● Automatic stop select. (Removable function) ● Reverse detected signal pin. 33 32 APPLICATION 12 CD-ROM,DVD,DVD-ROM,DVD-RAM etc. 13 30 14 29 GND 31 VM 15 28 Hw- VCC2 16 27 Hw+ EC 17 26 Hv- ECR 18 25 Hv+ VCC1 19 24 Hu- HB 20 23 Hu+ N.C 21 22 N.C Outline 42P9R-A N.C: no connection VCC2 16 MODE1 7 MODE2 6 W S/S RS VCC1 39 40 41 2 38 19 Vref I/I Converter BRAKING MODE CHANGE MODE4 SENSE TSD MODE3 V/I Converter 37 FG 4 RDS 3 FG RDS GND 120° MATRIX 36 GND 29 to 35 15 V 8 to 14 VM U ++ - BLOCK DIAGRAM + - + - + - Hall Bias 23 24 25 26 27 28 20 5 17 18 Hu+ Hu- Hv+ Hv- Hw+ Hw- HB CI EC ECR MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER PIN DESCRIPTION Pin No. Symbol 20 N.C S/S RDS FG CI MODE2 MODE1 GND VM VCC2 EC ECR VCC1 HB 21 N.C 1 2 3 4 5 6 7 – 14 8 15 16 17 18 19 Function ABSOLUTE MAXIMUM RATING (Ta=25 Parameter 42 N.C 24 25 26 27 28 – 35 36 37 38 39 40 3 pin [RDS] and 4 Function Hu+ Sensor amp. input Hu- Sensor amp. input Hv+ Sensor amp. input Hv- Sensor amp. input Hw+ Sensor amp. input Hw- Sensor amp. input GND Hall amplifier sensitivity select Automatic stop select Motor current sense Motor drive output U Motor drive output V Motor drive output W pin[FG]. ) Conditions Rating Unit pin pin 19 pin Note 1 16 16 7.0 1.5 V V V A – 28 pins 4.5 V Power dissipation Free Air 1.2 W Thermal derating Junction temperature Operating temperature Storage temperature Free Air 9.6 150 -20 – +75 -40 – +125 mW/˚C ˚C ˚C ˚C VM VCC2 VCC1 Io Motor supply voltage 12V supply voltage 5V supply voltage Output current VH(c) Sensor amp. Differential input range Pt Kθ Tj Topr Tstg 41 23 29 Symbol N.C Hu+ HuHv+ HvHw+ HwGND MODE4 MODE3 RS U V W 22 Start / Stop Reverse detected signal Frequency generator output Phase Compensation Reverse torque mode select 2 Reverse torque mode select 1 GND Motor supply voltage 12V supply voltage Motor speed control The reference voltage for EC 5V supply voltage Bias for Hall Sensor * Pull-up resistors (10kohm) are included in the circuits connected to Symbol Pin No. 15 16 23 *Note1 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER RECOMMENDED OPERATING CONDITIONS Symbol VCC1 VCC2 VM Io Parameter Limits Typ. 5.0 12.0 12.0 Min. 4.5 4.5 4.5 5V Power supply 12V Power supply Motor Power supply Output drive current Unit Max. 5.5 13.2 13.2 700 V V V mA ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V, VM=12V, Ta=25˚C unless otherwise noted.) Symbol Icc1 Icc2 Icc3 Parameter Sleep Mode Supply current- 1 Sleep Mode Supply current- 2 Supply current- 3 Conditions Limits Typ. Max. 0 100 µA 500 µA 6.0 mA 1.2 1.9 V -40 0 -21 +21 0 +40 mV Min. 15 and 16 pin total Input Current ( 2 pin low or open) 19 pin Input Current ( 2 pin low or open) 19 pin Input Current (EC=ECR=2.5V) [ 2 pin High] Unit Vsat Saturation voltage Top and Bottom saturation voltage. (Load current :500mA) ECdeadECdead+ Dead Zone Control voltage dead zone EC < ECR EC > ECR ECR Reference voltage Input range 18 pin [3.3v DSP available] 0.5 1.65 4.0 V EC Control voltage Input range 17 pin [3.3v DSP available] 0.5 1.65 4.0 V Gio Vlim Control gain Control limit Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A] 0.25 0.27 0.3 0.3 0.35 0.33 V/V V VH com Hall sensor amp common mode input range 23 – 28 pins 4.5 V VHmin1 VHmin2 Hall sensor amp. input signal revel 23 – 28 pins VHb Hall bias terminal output voltage Load current (IHb) =10 mA. IHb Hall bias terminal sink current Von Motor start voltage 2 pin input voltage when it starts up the motor. *The IC is in the active condition. *The hall bias is available. Voff Motor stop voltage 2 pin input voltage when it stops the motor. *The IC is in the sleep condition. *The hall bias is off. ViH mode pin input high voltage 7 pin[MODE1], 6 pin[MODE2], 37 pin[MODE3] and 36 pin[MODE4] input voltage when they are HIGH. ViL VOL mode pin input low voltage 3pin[RDS],4pin[FG] output low voltage 1.2 MODE4=OPEN or HIGH MODE4=GND 50 35 0.6 mV p-p 0.85 1.2 V 30 mA 2.0 V 0.8 2.0 V V 7 pin[MODE1], 6 pin[MODE2], 37 pin[MODE3] and 36 pin[MODE4] input voltage when they are LOW. 0.8 V Io current = 1mA 0.5 V MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V, VM=12V, Ta=25˚C Unless otherwise noted. ) The relationship between the EC-ECR (the difference between EC<(control voltage> and ECR <reference voltage> ) and the torque is shown in Figure 1. The current gain is 0.6A/V (at sensing resistor :0.5ohm) in both torque directions, and the dead zone is from ±0mV to ±40mV. When the all short brake mode is selected, the coil current under the reverse torque control depends on the back emf. and the coil resistance. Reverse Torque Current limit 0.6A/V 0 – +40mV 0 0.6A/V EC - ECR 0 – -40mV Current limit Forward Torque Figure 1. The characteristics of the control voltage and motor current ( Torque ). THERMAL DERATING 6.0 (W) This IC's package is POWER-SSOP, so improving the board on which the IC is mounted enables a large power dissipation without a heat sink. For example, using an 1 layer glass epoxy resin board, the IC's power dissipation is 2.7W at least. And it comes to 4.0W by using an improved 2 layer board. The information of the H, I, J type board is shown in the board information. 4.0W using A-type board Power Dissipation (Pdp) 5.0 3.0W using B-type board 4.0 2.7W using C-type board 3.0 2.0 1.0 0 25 50 75 Ambient Temperature 100 Ta ( 125 ) 150 MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 2. Hw+ Hv+ Hu+ Hall elements U V Hall inputs V U Outer loator U V W SOURSE W W V V U W U Output current REVERSE EC>ECR W V SINK U W V U W FORWARD EC<ECR Figure 2. HALL AMPLIFIER INPUT SENSITIVITY SELECT MODE4 OPEN or HIGH GND 120 degree switching 120 degree soft switching ** Io current changes sharply. The hallamp minimum input voltage is 50 mVp-p. Figure 3 shows the hall amplifier input sensitivity select function. You are able to select a sensitivity of a hall amplifier out of two levels which is suitable for the hall elements type. If the output minimum level of the hall elements is lower than 50mVp-p, please connect the MODE4 pin to external GND. In this case, the output current changes shaply. If the output minimum level of the hall elements is higher than 50mVp-p, please make the MODE4 pin open, then the output current is commutated softly. We recommend that the output level of the hall elements be set between 80mVp-p and 120mVp-p, and the MODE4 pin is an open. The hallamp minimum input voltage is 35 mVp-p. Figure 3. SLEEP MODE FUNCTION START / STOP ( 2 pin) LOW or OPEN HIGH Motor Stop Motor on Bias off Bias on Hall-Bias of Hall-Bias on Figure 4. Figure 4 shows the sleep mode function. If the 2 pin [S/S] is set to be open or low, the motor drive outputs have high impedance and the motor stops. Then, the IC bias current wil be a slight current (please refer to the electrical characteristics), and the hall bias output will be cut off. When the 2 pin input is high, all the circuits will work. MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER FORWARD AND REVERSE ROTATION DETECT FUNCTION Figure 5 shows the circuits and the functions of the forward and reverse rotation detect . The output of the RDS pin is determined by the signals of hall inputs ( Hu+, Hu-, Hv+ and Hv- ) which indicate the direction of rotation. When the motor is spinning forward, the RDS pin output will be low. When the motor rotates reversely in stop mode, it will be high. The RDS pin is pulled-up to VCC1 by internal resistor (typ.10kohm). RDS MODE3 FG VCC1 Hu+ VCC1 Hu- Hv+ Hv- + FG-amp CI - Q Q D R + T Hall sensor-amp - EC-ECR FORWARD Hw+ Hv+ REVERSE Hu+ Comparator Hysteresis RDS FG Figure 5. Hw+ D D T T Q Q High High Low High Low RDS FG Low High Low Hw+ Hu+ Hv+ Hw- MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER AUTOMATICALY STOP AFTER REVERSE BRAKING FUNCTION Figure 5 also shows the automaticaly stop (after the reverse braking) circuit. Figure 6 is its function table which shows whether the automaticaly stop function is on or off, and its state is determined by MODE3 input. When the MODE3 is open or high, the motor will stop rotating automaticaly after the reverse braking. When the MODE3 is low or connected to GND, the motor will continue the reverse rotation. This function is useful for the case that the system doesn't require the automaticaly stop function, and in the system a motor receives a stop command from the outside of this IC. For example, a µcom can detect the reverse rotation from the RDS pin output, and can control all the torque of a motor. So it can stop the motor outside this IC. FG FUNCTION Figure 5 also shows the circuits and the functions of the frequency generator. The FG pin outputs the square pulse signal synchronizing with the hall inputs [Hv+ and Hv-] timming . The FG pin is pulled-up to VCC1 by an internal resistor [typ. 10Kohm]. MODE3 OPEN or HIGH REVERSE TORQUE MODE SELECT FUNCTION In the 4 times speed and the 6 times speed CDROM drive system, the reverse braking style has been used for a deceleration of the rotation speed. However, in the CDROM drive system above an 8 times speed, the motor current above 0.5A is needed, because a high speed access time are required for motor driver ICs. If the reverse braking is used at 0.5A, the IC junction temperature will be too much high, and the heat loss of the IC will be large. Therefore, this motor driver has the braking mode select function (REVERSE BRAKING MODE and SHORT BRAKING MODE). The breaking mode can be determined by the external logic signals synchronizing with servo timing, and it can make a heat loss of the IC smaller by adjusting the junction temperature. Figure 7 shows the reverse torque mode select function table. If you want the former braking style (the reverse braking ), please select only the REVERSE BRAKING mode [MODE1=LOW or OPEN and MODE2=HIGH]. But the heat loss will be larger, and sometimes external heat sink would be necessary. If it is possible to get ports more than two from µcom, you can flexibly control the four kinds of BRAKING MODE. So the heat loss can be half as usual. For example, the REVERSE BRAKING MODE is on under the CLV control, and the ALL SHORT BRAKING MODE is for seeking. When the motor should be stopped, the ALL SHORT BRAKING MODE or the REVERSE BRAKING MODE is available. If you can only get one port, you can control only the MODE2. At this time, you can control the two kinds of BRAKING MODE [commutated short or reverse] on condition that the MODE1 is set to be LOW or OPEN. GND BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE MODE1 AUTOMATIC STOP Figure 6. UN-AUTOMATIC (NON-STOP) LOW or OPEN HIGH LOW or OPEN COMMUTATED SHORT BRAKING ALL SHORT BRAKING HIGH REVERSE BRAKING OUTPUT OPEN [only inertia] MODE2 Figure 7. MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER REVERSE TORQUE MODE SELECT FUNCTION Figure 8 shows an example for the reverse torque mode select. The CASE1 is an example for controlled REVERSE and COMMUTATED SHORT BRAKING. The CASE2 is an example for controlled REVERSE and ALL SHORT BRAKING. CASE 1 CASE 2 REVERSE AND COMMUTATED SHORT BRAKING SELECT REVERSE AND ALL SHORT BRAKING SELECT EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V] EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V] 5.0V 5.0V 3.0V ECR 2.5V 2.0V 3.0V ECR 2.5V 2.0V 0V 0V HIGH HIGH MODE2 MODE2 LOW LOW MODE1 MODE1 LOW LOW Commutated short BRAKING BRAKING MODE +1A FORWARD CURRENT REVERSE TORQUE CURRENT -1A BRAKING MODE REVERSE BRAKING REVERSE BRAKING +1A MOTOR CURRENT [ Rsense = 0.5 ohm ] +60 0mA -60 0mA ALL SHORT BRAKING MOTOR CURRENT +60 0mA FORWARD CURRENT MOTOR STOP REVERSE TORQUE CURRENT -1A -60 0mA MOTOR STOP ( Vbemf-Vd-Vsat ) / Ra Vd ; diode voltage Vsat ; npn transistor saturation voltage Ra ; motor inner resistance Figure 8. MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER BASICALLY CHARACTERISTICS This data is an example for typical sample. Output saturation voltage and Load current Characteristics. (Condition Vcc2=Vm=12V, Vcc=5V) 12.0 Top side saturation voltage 11.5 0.76 0.79 0.86 0.89 0.91 0.98 11.0 1.05 Output Voltage (V) 1.18 10.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.76 0.62 0.49 0.38 0.5 0.07 0.13 0.25 Bottom side saturation voltage 0.32 0 0 200 400 600 800 1000 1200 Load current (mA) Output saturation voltage and Load current Characteristics. (At bootstrap) By taking advantage of bootstrap function, the output saturation voltage can be lower. (Condition Vcc2=6V,Vm=5V,Vcc=5V) 5.0 0.06 0.29 0.12 0.35 0.47 0.23 4.5 0.83 4.0 Output Voltage (V) Top side saturation voltage 0.62 3.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.38 0.5 0.07 0.13 0.49 0.62 0.76 0.25 Bottom side saturation voltage 0.32 0 0 200 400 600 Load current (mA) 800 1000 1200 MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER HB terminal voltage and Hall current characteristics. (Condition :Vcc=4.4V – 7V) 1.6 1.4 HB terminal voltage (V) 1.2 1.0 0.85 0.8 0.6 0.4 0.2 0 0 10 20 30 Hall current (mA) 40 50 MITSUBISHI <CONTROL / DRIVER IC> M56785FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT Forward reverse rotation signal µcom control BRAKING MODE SELECT FG signal 12V Motor power supply 0 to 1.5 10µF 15 16 6 7 36 37 4 3 5V BRAKING MODE CHANGE SENSE FG RDS Hall bias resistor + 24 - 39 23 HU 104 104 - 40 + 26 120° MATRIX 25 HV 104 + 28 - 41 27 HW Hall Bias 20 I/I Converter 5 ++ Motor current sense resistor 38 Vlim 0.5 19 18 V/I Converter 17 Control PWM1 Start / Stop 2 TSD 104 Reference PWM2 8 to 14 and 29 to 35 5V Power Supply 10µF