MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M56755FP is a semiconductor integrated circuit designed for a single chip controller for CD-ROM spindle motor. 1 36 W RDS 2 35 V FG 3 34 U select in order to generate the reverse torque. Also, this device CI 4 33 RS includes a bias circuit for Hall Sensor, a current limit circuit and a MODE2 5 32 MODE3 thermal shut down function. MODE1 6 31 MODE4 7 30 8 29 by the motor speed control terminal. M56755FP has the several braking mode that an user can flexibly FEATURES ●The supply voltage with wide range. M56755FP S/S M56755FP has a both (forward and reverse) motor torque control 9 GND (4.5V to 13.2V) ●High motor drive current (1.2A) 10 11 ●Motor current control for the both motor torque is possible. 12 ●Reverse torque mode select (SHORT BRAKING, etc) ●Sleep mode ●Hall amplifier sensitivity select GND 27 26 25 VM 13 24 Hw- VCC2 14 23 Hw+ EC 15 22 Hv- ECR 16 21 Hv+ VCC1 17 20 Hu- HB 18 19 Hu+ ●Automatic stop select (with reverse detected signal pin) APPLICATION 28 CD-ROM, DVD, DVD-ROM etc. Outline 36P2R-D BLOCK DIAGRAM U V W S/S RS VCC1 34 35 36 1 33 17 7 VM 13 VCC2 14 MODE1 6 MODE2 5 - 8 ++ Vref GND 10 I/I converter BRAKING MODE CHANGE 9 11 120˚ 12 MATRIX 25 MODE4 31 SENSE 26 TSD MODE3 V/I converter 27 32 FG 3 RDS 2 FG RDS + - + - + - 28 Hall bias 29 30 19 20 21 22 Hu+ Hu- Hv+ Hv- 23 24 18 4 15 16 Hw+ Hw- HB CI EC ECR GND MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 to 12 13 14 15 16 17 18 19 20 21 22 23 24 25 to 30 31 32 33 34 35 36 * The Symbol S/S RDS FG CI MODE2 MODE1 GND VM VCC2 EC ECR VCC1 HB Hu+ HuHv+ HvHW+ HWGND MODE4 MODE3 RS U V W Function 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 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 2 pin[RDS] and 3 pin[FG] are with pull-up resistor (10kohm). ABSOLUTE MAXIMUM RATING (Ta=25˚C) Symbol VM VCC2 VCC1 lo VH(c) Pt Kθ Tj Topr Tstg Parameter Motor supply voltage 12V supply voltage 5V supply voltage Output current Sensor amp. Differential input range Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature Conditions pin maximum input voltage 14 pin maximum input voltage 17 pin maximum input voltage *Note 1 19 to 24 pins Free Air Free Air 13 *Note1 ; There is no overing Pt (power dissipation) or the area of safety operation Rating 16 16 7.0 1.5 4.5 1.2 9.6 150 -20 – +75 -40 – +125 Unit V V V A V W mW/˚C ˚C ˚C ˚C MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER RECOMMENDED OPERATING CONDITIONS Symbol VCC1 VCC2 VM lo Parameter 5V Power supply 12V Power supply Motor Power supply Output drive current Min. 4.5 4.5 4.5 Limits Typ. 5.0 12.0 12.0 Max. 5.5 13.2 13.2 700 Unit V V V mA ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V, VM=12V, Ta=25˚C unless otherwise noted) Symbol lcc1 lcc2 lcc3 Parameter Sleep Mode Supply current-1 Sleep Mode Supply current-2 Supply current-3 Test conditions and 14 pin total Input Current [ 1 pin lo or open] pin Input Current [ 1 pin lo or open] 17 pin Input Current (EC=ECR=2.5V) [ 1 pin Hi] 13 17 Top and Bottom saturation voltage. Load current 500mA EC < ECR ECdead- Control voltage EC > ECR ECdead+ dead zone 16 pin Input voltage range. (3.3V DSP available) Reference voltage Input range ECR 15 pin Input voltage range. (3.3V DSP available) Control voltage Input range EC Control gain Gio lo = Gio /Rsense [A/V] Control limit llim=Vlim / Rsense [A] Vlim VH com Hall sensor amp common mode input range 19 – 24 pins input range. 19 – 24 pins MODE4 = open VHmin1 Hall sensor amp. input signal level input signal VHmin2 MODE4 = GND Hall bias terminal output voltage VHb Load current (IHb) 10mA. Hall bias terminal sink current IHb Vsat Min. Saturation voltage 1 pin input voltage when makes the motor start up. *The ICs will be the active condition. *The hall bias will be available. Von Motor start voltage Voff Motor stop voltage ViH mode pin input high voltage 6 pin [MODE1], 5 pin [MODE2], 32 pin [MODE3] and 31 pin [MODE4] input voltage when makes high level. ViL mode pin input low voltage 6 pin [MODE1], 5 pin [MODE2], 32 pin [MODE3] and 31 pin [MODE4] input voltage when makes low level. VOL 2 1 pin [RDS], 3 -50 +5 0.5 0.5 1.95 0.27 1.2 50 35 0.6 1.2 1.9 -25 +25 1.65 1.65 2.3 0.3 -5 +50 4.0 4.0 2.65 0.33 4.5 Unit µA µA mA V mV V V V/V V V mVp-p 0.85 1.2 30 2.0 pin input voltage when makes the motor stop. *The ICs will be the sleep condition. *The hall bias will be off. pin [FG] output low voltage at Io current = 1mA Limits Typ. Max. 100 0 500 6.0 V mA V 0.8 V V 2.0 0.8 V 0.5 V MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC=5V, VM=12V, Ta=25˚C, Unless otherwise noted.) Reverse torque Current limit 0 4.6A/V The relationship between the EC (control voltage), ECR (reference voltage) and the torque is as shown in Figure 1. The current gain is 4.6A/V (at sensing resistor : 0.5ohm) in the both torques and a dead zone is ±5mV to ±50mV. 4.6A/V +5 – +50mV EC - ECR -5 – -50mV Current limit Forward Torque Figure 1. The characteristics of the control voltage and motor current (Torque). MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER HALL AMPLIFIER INPUT AND COMMUTATION The relationship between the hall amplifier inputs voltage and the motor current outputs is as shown in Figure 2. Hw+ Hv+ Hu+ Hall elements U V Hall inputs Outer loator U V U W V SOURSE Output current W V U W U SINK U W V U W W V REVERSE EC>ECR W V FORWARD EC<ECR Figure 2. HALL AMPLIFIER INPUT SENSITIVITY SELECT MODE4 OPEN or HIGH 120 degree soft switching The hall amp input voltage minimum is 50mVp-p. GND 120 degree switching ** Io current will be shape. The hall amp input voltage minimum is 35mVp-p. Figure 3. Figure 3 shows the hall amplifier input sensitivity select function. An user is able to select the sensitivity of a hall amplifier to match with the hall elements type. If the output minimum level of a hall elements is a low level as below 50mVp-p, please connect the MODE4 to GND at external. In this case, the output current will be shape. If the output minimum level of a hall elements is more higher than 50mVp-p, please make the MODE4 to open, then the output current will be commutated softly. We recommend that the output level of a hall element is used for 80mVp-p to 120mVp-p and the MODE4 is made to open. SLEEP MODE FUNCTION START / STOP LOW or OPEN HIGH Motor Stop Motor on Bias off Bias on Hall-Bias off Hall-Bias on Figure 4. Figure 4 shows the sleep mode function. If the 1pin [S/S] is set to open or low, the current output will be high impedance and then the motor will be stop. Also, the IC bias current wil be a slight current (please make reference the electrical characteristics). At the same time, the hall bias output will be cut off. When the 1pin goes high, the all of circuits will be available. MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER FORWARD AND REVERSE ROTATION DETECT FG FUNCTION Figure 5 shows the circuits and function of the forward and reverse rotation detect. The RDS is the output signal pin that detected by the signal of hall inputs (Hu+,Hu-,Hv+ and Hv-). The RDS pin is pulled-up to VCC1 by internal resistor (typ. 10kohm). When the motor is spinning at forward, the RDS pin output will be a low level. When the rotation of motor is reversed at stop mode, it will be a high level. Figure 5 shows the circuits and function of the frequency generator, too. The FG is the pin that output the signal synchronize with the hall inputs [Hv+ and Hv-] timming. The FG pin is pulled-up to VCC1 by internal resistor [typ.10Kohm]. AUTOMATICALY STOP AFTER REVERSE BRAKING Figure 5 shows the automaticaly stop circuits after the reverse braking, too. Figure 6 shows its function table. The MODE3 is the input pin in order to be selected either the automaticaly stop or non-stop. When the MODE3 is open, the motor rotation will be stopped automaticaly after the reverse braking in order to make stop the motor. When the MODE3 is connected to GND, the motor will continue the reversed rotation. This mode [MODE3=GND] is available for the case that an user hope to control the motor stopping at external. MODE3 OPEN or HIGH GND AUTOMATIC STOP UN-AUTOMATIC (NON-STOP) Figure 6. RDS MODE3 FG VCC1 Hu+ Hu- Hv+ Hv- Hw+ Hw- VCC1 FG-amp + CI Q D Q + T R - Hall sensor-amp EC-ECR FORWARD Hw+ Hv+ Hu+ REVERSE Comparator Hysteresis D D T T Q Q High RDS RDS Low FG High Low Figure 5. High Low FG High Low Hw+ Hu+ Hv+ MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER control flexibly in match with the situation of junction temperature. Figure 7 shows the reverse torque mode select function table. If you hope original(the reverse braking) style, please only select REVERSE BRAKING mode [MODE1=LOW or OPEN and MODE2 =HIGH] at external. If it is possible to get two more port from µcom, you can flexibly control the four kinds of BRAKING MODE. If you can only get one more port, you can control only the MODE2. Then, you can control the two kinds of BRAKING MODE [commutated short or reverse] under the MODE1 is set to LOW or OPEN. REVERSE TORQUE MODE SELECT FUNCTION At the 4 times speed and the 6 times speed CDROM drive system, the reverse braking style has been used for the reverse torque. However, at the 8 times speed CDROM drive system,the motor current will be needed above 0.7A, if an user of driver IC require a high speed access time. If the reverse braking is used at 0.7A, the IC junction temperature will be too much high. Therefore, MITSUBISHI new motor driver has the braking mode select function. This mode select function is available in order to Figure 8 shows an example for the reverse torque mode select. The CASE1 is an controlling example for REVERSE and COMMUTATED SHORT BRAKING. The CASE2 is an controlling example for REVERSE and ALL SHORT BRAKING. MODE1 LOW or OPEN HIGH LOW or OPEN COMMUTATED SHORT BRAKING HIGH REVERSE BRAKING ALL SHORT BRAKING MODE2 OUTPUT OPEN [only inertia] Figure 7. 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] +600mA -600mA ALL SHORT BRAKING MOTOR CURRENT +600mA FORWARD CURRENT MOTOR STOP REVERSE TORQUE CURRENT -1A -600mA MOTOR STOP ( Vbemf-Vd-Vsat ) / Ra Vd ; diode voltage Vsat ; npn transistor saturation voltage Ra ; motor inner resistance Figure 8. MITSUBISHI <CONTROL / DRIVER IC> M56755FP SPINDLE MOTOR DRIVER THERMAL DERATING BASICALLY CHARACTERISTICS This data is an example for typical sample. Output Saturation Voltage and Load current characteristics Condition (Vcc2=Vm=12V, Vcc=5V) 6.0 (W) 11.5 With infinite heatsink 5.0 4.5 Output voltage (V) Power dissipation (Pdp) Top side saturation voltage 12.0 4.0 Without heatsink 3.0 2.0 0.76 0.79 0.86 0.89 0.91 0.98 1.05 11.0 1.18 10.5 ~ ~ 1.5 This device can use this voltage value due to motor drive. 1.0 1.2 1.0 0.5 0.07 0.13 0 25 50 75 100 125 Ambient temperature (Ta) 0 150 0 200 (˚C) 0.38 0.49 0.32 400 600 800 0.25 0.62 1000 0.76 Bottom side saturation voltage 1200 Load current (mA) Output saturation voltage and Load current Characteristics. (At bootstrap) If you use a bootstrap as below, it is possible to make low the output saturation voltage. HB terminal voltage and Hall current characteristics. Condition (Vcc2=6V, Vm=5V, Vcc=5V) 0.06 0.12 Output voltage (V) 4.5 0.29 0.35 0.23 0.47 0.62 4.0 Condition (Vcc=4.4V–7V) Top side saturation voltage 0.83 3.5 ~ ~ 1.5 This device can use this voltage value due to motor drive. 1.0 0.5 0 0.07 0.13 0 200 0.25 0.38 0.32 400 600 0.49 800 Load current (mA) 0.62 1000 0.76 Bottom side saturation voltage 1200 1.6 1.4 HB terminal voltage (V) 5.0 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> M56755FP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT µcom control Brake mode select Forward/reverse FG rotation signal signal 12V Motor power supply 0 to 1.5 2 3 32 6 31 5 14 10uF 13 5v BRAKING MODE CHANGE SENSE FG RDS Hall bias resistance + 19 34 Hu - 20 104 120˚ MATRIX + 21 Hv 22 - 23 35 + 36 Hw - 24 104 TSD Hall bias 18 1 Start/Stop I/I converter 104 104 4 + + Motor current sense resistor V/I converter 15 33 Vlim Control PWM1 0.5 16 17 Reference PWM2 7 8 9 10 11 12 25 26 27 28 29 30 5V power supply 10uF 7