MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M56755AFP is a semiconductor integrated circuit designed for a single chip controller for CD-ROM spindle motor. M56755AFP has a both (forward and reverse) motor torque control by the motor speed control terminal. M56755AFP has the several braking mode that an user can flexibly select in order to generate the reverse torque. Also, this device includes a bias circuit for Hall Sensor, a current limit circuit and a thermal shut down function. FEATURES 1 36 W RDS 2 35 V FG 3 34 U CI 4 33 RS MODE2 5 32 MODE3 MODE1 6 31 MODE4 7 30 8 29 M56755AFP ● 3.3V DSP available. ● The supply voltage with wide range. (4.5V to 13.2V) ● High motor drive current (1.2A). ● Motor current control for the both motor torque is possible. ● Reverse torque mode select [SHORT BRAKING, etc] ● Sleep mode ● Hall amplifier sensitivity select ● Automatic stop select (with reverse detected signal pin) S/S 9 GND 10 11 APPLICATION Above 8 times speed CD-ROM, DVD, DVD-ROM etc. 28 GND 27 26 12 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+ Outline 36P2R-D BLOCK DIAGRAM 13 VCC2 14 V W S/S 34 35 36 1 RS VCC1 33 - VM U 17 6 MODE2 5 MODE4 31 I/I Converter BRAKING MODE CHANGE 120° MATRIX SENSE TSD MODE3 V/I Converter 32 FG 3 RDS 2 FG RDS + - + - + - Hall Bias 19 20 21 22 23 24 18 Hu+ Hu- Hv+ Hv- Hw+ Hw- HB 4 CI 15 16 EC ECR GND 25 to 30 MODE1 7 to 12 ++ Vref GND MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER PIN FUNCTION Pin No. 18 S/S RDS FG CI MODE2 MODE1 GND VM VCC2 EC ECR VCC1 HB 2 pin[RDS] and 1 2 3 4 5 6 7 – 12 13 14 15 16 17 *The Symbol Function Pin No. 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 3 19 20 21 22 23 24 25 – 30 31 32 33 34 35 36 Symbol Hu+ HuHv+ HvHw+ HwGND MODE4 MODE3 RS U V W 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] are with pull-up resistor (10kohm). ABSOLUTE MAXIMUM RATING (Ta = 25°C) Symbol VM VCC2 VCC1 Io 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 pin maximum input voltage 17 pin maximum input voltage *Note 1 13 14 19 – 24 pins Free Air Free Air *Note1; There is no overing Pt (power dissipation) or the area of safety operation. Rating Units 16 16 7.0 1.5 V V V A 4.5 V 1.2 9.6 150 -20 – +75 -40 – +125 W mW/°C °C °C °C MITSUBISHI <CONTROL / DRIVER IC> M56755AFP 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 Max. 5.5 13.2 13.2 700 Units V V V mA ELECTRICAL CHARACTERISTICS (VCC = 5V, VCC2 = 12V ,VM = 12V, Ta = 25°C unless otherwise noted.) Symbol Parameter ICC1 ICC2 ICC3 Sleep Mode Supply current - 1 Sleep Mode Supply current - 2 Supply current - 3 Vsat Saturation voltage ECdeadECdead+ ECR EC Gio Vlim VH com VHmin1 VHmin2 Control voltage dead zone Reference voltage Input range Control voltage Input range Control gain Control limit Hall sensor amp common mode input range Hall sensor amp. input signal revel Conditions 13 and 14 pin total Input Current [ 1 pin lo or open] 17 pin Input Current [ 1 pin lo or open] 17 pin Input Current (EC = ECR = 2.5V) [ 1 pin Hi] Top and Bottom saturation voltage Load current 500mA EC < ECR EC > ECR 16 pin Input voltage range [3.3V DSP available] 15 pin Input voltage range [3.3V DSP available] Io = Gio / Rsense [A/V] Ilim = Vlim / Rsense [A] 19 – 24 pins input range 19 – 24 pins input signal MODE4 = open MODE4 = GND Min. — — — Limits Typ. 0 — — Max. 100 500 6.0 — 1.2 1.9 -40 0 0.5 0.5 0.25 0.27 -21 +21 1.65 1.65 0.3 0.3 0 +40 4.0 4.0 0.35 0.33 V V V/V V 1.2 — 4.5 V 50 35 — — — — mVp-p Units µA µA mA V mV MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER ELECTRICAL CHARACTERISTICS (VCC = 5V, VCC2 = 12V ,VM = 12V, Ta = 25°C unless otherwise noted.) Symbol Min. Limits Typ. Max. 0.6 0.85 1.2 V — — 30 mA pin input voltage when makes the motor start up. *The ICs will be the active condition. *The hall bias will be available. 2.0 — — V pin input voltage when makes the motor stop. *The ICs will be the sleep condition. *The hall bias will be off. — — 0.8 V Parameter Conditions Units VHb Hall bias terminal output voltage IHb Hall bias terminal sink current 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. 2.0 — — V 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. — — 0.8 V VOL 2 pin[RDS], low voltage at Io current = 1mA — — 0.5 V Load current (IHb) 10mA. 1 1 3 pin[FG] output ELECTRICAL CHARACTERISTICS (VCC=5V, VM=12V, Ta=25°C Unless otherwise noted.) Reverse Torque Current limit 0.6A/V 0 – +40mV 0 0.6A/V EC - ECR 0 – -40mV The relationship between the EC (control voltage), ECR (reference voltage) and the torque is as shown in Figure 1. The current gain is 0.6A/V (at sensing resistor: 0.5ohm) in the both torques and a dead zone is ±0mV to ±40mV. Current limit Forward Torque Figure 1. The characteristics of the control voltage and motor current (Torque). MITSUBISHI <CONTROL / DRIVER IC> M56755AFP 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 Outer loator Hall inputs W U V W U V W SOURSE V V U W U Output current SINK U W V U W 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 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. Figure 3. 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 1 pin [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 1 pin goes high, the all of circuits will be available. MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER 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. FORWARD AND REVERSE ROTATION DETECT 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 V CC1 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. FG FUNCTION 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 BRAK-ING 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 MODE3 OPEN or HIGH GND AUTOMATIC STOP UN-AUTOMATIC (NON-STOP) Figure 6. RDS MODE3 FG VCC1 Hu+ VCC1 FG-amp Hu- Hv+ Hv- Hw+ + CI . - Q D Q + T R - Hall sensor-amp EC-ECR FORWARD Hw+ Hv+ Hu+ REVERSE Comparator Hystelesis RDS D D T T Q Q High High Low High FG Low Figure 5. RDS Low FG High Low Hw+ Hu+ Hv+ Hw- MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER 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 control flexibly in match with the situation of junction temperature. Figure 7 shows the reverse torque mode select function table. BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE 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 MODE2 HIGH LOW or OPEN COMMUTATED SHORT BRAKING HIGH REVERSE BRAKING SHORT ALL BRAKING SHORT (2) BRAKING 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> M56755AFP 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 1.05 11.0 Output Voltage (V) 1.18 10.5 This device can use this voltage value due to motor drive. 1.5 1.0 0.38 0.5 0.13 0.07 0.76 0.62 0.49 Bottom side saturation voltage 0.25 0.32 0 0 200 400 600 800 1000 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. (Condition Vcc2=6V,Vm=5V,Vcc=5V) 5.0 0.29 0.06 0.12 4.5 0.35 0.47 0.23 Top side saturation voltage 0.62 Output Voltage (V) 4.0 0.83 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 0.76 0.62 Bottom side saturation voltage 0.25 0.32 0 0 200 400 600 Load current (mA) 800 1000 1200 MITSUBISHI <CONTROL / DRIVER IC> M56755AFP 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 20 10 40 30 50 Hall current (mA) THERMAL DERATING 6.0 (W) With infinite heatsink Power Dissipation (Pdp) 5.0 4.5 4.0 Without heatsink 3.0 2.0 1.2 1.0 0 25 50 75 100 Ambient Temperature (Ta) 125 150 (°C) MITSUBISHI <CONTROL / DRIVER IC> M56755AFP SPINDLE MOTOR DRIVER APPLICATION CIRCUIT µcom control Forward reverse rotation signal BRAKING MODE SELECT FG signal 12V Motor power supply 0 to 1.5 10uF 13 14 5 6 31 32 3 2 5V BRAKING MODE CHANGE SENSE FG RDS Hall bias resistance + 20 - 34 19 Hu 104 - 35 + 22 120° MATRIX 21 Hv 104 104 + 24 - 36 23 Hw Hall Bias 18 I/I Converter 4 ++ - Motor current sense resistor 33 0.5 Vlim 17 16 V/I Converter 15 Control PWM1 Start / Stop 1 TSD 104 Reference PWM2 7 to 12 and 25 to 30 5V Power Supply 10uF