INTEGRATED CIRCUITS DATA SHEET TDA5341 Brushless DC motor and VCM drive circuit with speed control Product specification File under Integrated Circuits, IC11 1997 Jul 10 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 FEATURES APPLICATIONS • Full-wave commutation (using push-pull output stages) without position sensors • Hard Disk Drive (HDD). • Built-in start-up circuitry GENERAL DESCRIPTION • Three push-pull MOS outputs: The TDA5341 is a BiCMOS integrated circuit used to drive brushless DC motors in full-wave mode. The device senses the rotor position using an EMF sensing technique and is ideally suited as a drive circuit for a hard disk drive motor. – 1 A output current – Low voltage drop – Built-in current limiter • Thermal protection The TDA5341 also includes a Voice Coil Motor driver (VCM), reset and park facilities and an accurate speed regulator. In addition, a serial port facilitates the control of the device. • General purpose operational amplifier • Reset generator • Motor brake facility • Actuator driver (H-bridge current-controlled) • Power-down detector • Automatic park and brake procedure • Adjustable park voltage • Sleep mode • Speed control with Frequency-Locked Loop (FLL) • Serial port • Friction reduction prior to spin-up. QUICK REFERENCE DATA Measured over full voltage and temperature range. SYMBOL PARAMETER MIN. TYP. MAX. UNIT VDD general supply voltage for logic and power 4.5 5.0 5.25 V IoMOT motor output current 1.3 1.6 1.9 A RDS(MOT) motor output resistance − 1.1 1.56 Ω IoACT actuator output current 0.7 1.1 1.4 A RDS(ACT) actuator output resistance − 2.0 2.5 Ω ORDERING INFORMATION TYPE NUMBER TDA5341G 1997 Jul 10 PACKAGE NAME LQFP64 DESCRIPTION plastic low profile quad flat package; 64 leads; body 10 × 10 × 1.4 mm 2 VERSION SOT314-2 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 BLOCK DIAGRAM handbook, full pagewidth CAPCP FREDENA TESTIN CAPCDM CAPCDS CAPTI CAPST BRAKE FG FMOT CAPXA CAPXB CAPYA CAPYB CNTRL 61 59 62 63 24 27 UPPER VOLTAGE CONVERTER DATA ENABLE RESET ROSC DPULSE RETRACT VCMIN1 VCMIN2 Vref GAINSEL 23 22 CURRENT LIMIT CONTROL 9 20 12 THERMAL SWITCH 18 ADAPTIVE COMMUTATION DELAY 19 2 TIMING OSCILLATOR 1 COMMUTATION AND OUTPUT DRIVING LOGIC START OSCILLATOR 11 POWER 1 60 POWER 2 8 POWER 3 21 7 BRAKE CONTROLLER 3 BAND GAP 2 10 26 58 43 POLES DIVIDER 44 UNDER-VOLTAGE DETECTOR 54 39 46 38 BAND GAP 1 SERIAL PORT 42 48 4 BRAKE AFTER PARK sleep 57 5 6 fill DIGITAL FREQUENCY COMPARATOR PROGRAMMING FREQUENCY DIVIDER PRESET MOT1 MOT2 MOT3 COMPARATORS 32 CHARGE PUMP 53 52 SENSE AMPLIFIER 35 51 MOT0 CLAMP1 CLAMP2 RESETOUT UVDIN1 UVDIN2 BRAKEDELAY AMPOUT AMPIN− AMPIN+ FILTER SENSEOUT SENSEIN+ SENSEIN− park 30 37 VCM H-BRIDGE 33 34 45 28 VCM PREAMPLIFIER 29 36 VCM+ VCM− FB1 FB2 TDA5341 15 50 14 55 31 49 VEED VEE1 VEE2 VEE3 VEE4 17 VEE 25 64 40 VDD1 VDD2 VDD3 Fig.1 Block diagram. 1997 Jul 10 ILIM CONTROL AMPLIFIER brake CLOCK CAPCPC 3 16 VDD 41 VDDD MGE817 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 PINNING SYMBOL PIN DESCRIPTION CAPST 1 external capacitor for starting oscillator CAPTI 2 external capacitor for timer circuit CLAMP1 3 external capacitor used to park the heads; must be externally connected to CLAMP2 AMPOUT 4 uncommitted operational amplifier output AMPIN− 5 uncommitted operational amplifier invert input AMPIN+ 6 uncommitted operational amplifier direct input MOT0 7 motor centre tap input MOT2 8 motor driver output 2 FREDENA 9 friction reduction mode enable input (active HIGH) FG 10 frequency generator (tacho) output BRAKE 11 brake input command (active LOW) TESTIN 12 test input for power output switch-off (active HIGH) TP1 13 test purpose 1 (should be left open-circuit) VEE1 14 ground for the spindle motor drivers GAINSEL 15 VCM gain adjustment input (switch ON when GAINSEL is LOW) VDD 16 general power supply VEE 17 general ground CAPCDM 18 external capacitor for adaptive commutation delay (master) CAPCDS 19 external capacitor for adaptive commutation delay (slave) PRESET 20 set the motor drivers into a fixed state: MOT1 = F (floating), MOT2 = L, MOT3 = H MOT3 21 motor driver output 3 CAPCPC 22 frequency compensation of the current control ILIM 23 current limit control input CNTRL 24 motor control VDD1 25 power supply 1 for the spindle motor drivers CLAMP2 26 external capacitor used to park the heads; must be externally connected to CLAMP1 CAPCP 27 external capacitor for the charge pump output FB1 28 output of the VCM preamplifiers FB2 29 switchable output of the VCM preamplifier RETRACT 30 park input command (active LOW) VEE3 31 ground 3 for the actuator driver FILTER 32 charge pump output to be connected to an external filter VCMIN1 33 VCM voltage control input VCMIN2 34 switchable VCM voltage control input DPULSE 35 data pulse input of the frequency comparator of the speed control Vref 36 voltage reference input VCM+ 37 positive output of the VCM amplifier DATA 38 input data of the serial port (active HIGH) CLOCK 39 clock input signal to shift DATA into SERIALIN register (active HIGH) VDD3 40 power supply 3 for the actuator driver 1997 Jul 10 4 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PIN TDA5341 DESCRIPTION VDDD 41 digital power supply ENABLE 42 enable input; enables the serial port, i.e. allows DATA to be shifted in (active LOW) RESETOUT 43 under-voltage detector output flag (active LOW) UVDIN1 44 external capacitor for the RESETOUT duration VCM− 45 negative output of the VCM amplifier BRAKEDELAY 46 delay control input for brake after park TP2 47 test purpose 2 (should be left open-circuit) ROSC 48 reference oscillator input for motor speed control VEE4 49 ground 4 for the actuator driver VEED 50 digital ground SENSEIN− 51 inverting input of the VCM sense amplifier SENSEN+ 52 non-inverting input of the VCM sense amplifier SENSEOUT 53 output of the VCM sense amplifier UVDIN2 54 external voltage reference for the under-voltage detector VEE2 55 ground 2 for the spindle motor drivers TP3 56 test purpose 3 (should be left open-circuit) RESET 57 reset input; forces all bits of the SERIALIN register to 0 (active HIGH) FMOT 58 tachometer output (one pulse per mechanical revolution) CAPXB 59 external capacitor for the charge pump output MOT1 60 motor driver output 1 CAPXA 61 external capacitor for the charge pump output CAPYA 62 external capacitor for the charge pump output CAPYB 63 external capacitor for the charge pump output VDD2 64 power supply for the spindle motor drivers 1997 Jul 10 5 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control 49 VEE4 50 VEED 51 SENSEIN− 52 SENSEIN+ 54 UVDIN2 55 VEE2 56 TP3 57 RESET 58 FMOT 59 CAPXB 60 MOT1 61 CAPXA 62 CAPYA 63 CAPYB 64 VDD2 handbook, full pagewidth 53 SENSEOUT TDA5341 CAPST 1 48 ROSC CAPTI 2 47 TP2 CLAMP1 3 46 BRAKEDELAY AMPOUT 4 45 VCM− AMPIN− 5 44 UVDIN1 AMPIN+ 6 43 RESETOUT MOT0 7 42 ENABLE MOT2 8 41 VDDD TDA5341 40 VDD3 Fig.2 Pinning diagram. 1997 Jul 10 6 31 32 VEE3 FILTER RETRACT 30 29 33 VCMIN1 FB2 16 28 VDD FB1 34 VCMIN2 27 15 CAPCP GAINSEL 26 35 DPULSE CLAMP2 14 25 VEE1 VDD1 36 Vref 24 13 CNTRL TP1 23 37 VCM+ ILIM 12 22 TESTIN CAPCPC 38 DATA 21 11 MOT3 BRAKE 20 39 CLOCK PRESET 10 CAPCDS 19 FG CAPCDM 18 9 VEE 17 FREDENA MGE816 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 • Speed control based on FLL technique FUNCTIONAL DESCRIPTION • Serial port DATAIN (24 bits) The TDA5341 offers a sensorless three-phase motor full-wave drive function. The device also offers protected outputs capable of handling high currents and can be used with star or delta connected motors. • Friction reduction prior to spin-up. TDA5341 modes description The TDA5341 can easily be adapted for different motors and applications. The TDA5341 can be used in two main modes, depending on whether they are controlled or not. The TDA5341 offers the following features: The ‘controlled modes’ (user commands) are executed by the TDA5341 without delay or priority treatment, either by software via the serial port or by hardware. BRAKE is a hardware command whereas RETRACT can be controlled in both ways. If it is preferable to control the heads parking via the serial bus, the equivalent pin can be left open-circuit. • Sensorless commutation by using the motor EMF • Built-in start-up circuit • Optimum commutation, independent of motor type or motor loading • Built-in flyback diodes • Three-phase full-wave drive The sleep mode is controlled by software only; it results from the combination of the spindle and actuator being disabled. The spindle is turned off by bit SPINDLE DISABLE, whereas the actuator is disabled towards bit VCM DISABLE of the serial port (see Section “Serial port”). In addition, a special spin-up mode can be activated in the event of high head stiction • High output current (1.3 A) • Low MOS RDSon (1 Ω) • Outputs protected by current limitation and thermal protection of each output transistor • Low current consumption • Additional uncommitted operational amplifier The ‘uncontrolled modes’ only result from different failures caused by either a too high internal temperature or an abnormally low power voltage, which will cause the actuator to retract and, after the spindle, to brake. The output signals mainly affected by those failures are RESETOUT, MOT1, 2 and 3, VCM+ and VCM−. This is summarised in Tables 1 and 2. • H-bridge actuator driver current controlled with an external series sense resistor • Automatic retract procedure • Adjustable park voltage • Sleep mode • Automatic brake (after park) procedure Table 1 Summary of controlled modes HARDWARE/ SOFTWARE VCM+ AND VCM− MODE MOT1, 2 AND 3 Software spindle disable high impedance high impedance HIGH spindle off Software VCM disable not affected high impedance HIGH spindle on; VCM off Hardware brake LOW not affected HIGH spindle coils ground Software/ hardware retract not affected VCM− = 0.65 V; VCM+ = 0 V HIGH heads parked Hardware friction reduction − not affected HIGH heads in vibration 1997 Jul 10 7 RESETOUT EFFECT Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control Table 2 TDA5341 Summary of uncontrolled modes FAILURE MOT1, 2 AND 3 VCM+ AND VCM− RESETOUT EFFECT Thermal shut-down high impedance → LOW VCM− = 0.65 V; VCM+ = 0 V LOW automatic park and brake Voltage shut-down high impedance → LOW VCM− = 0.65 V; VCM+ = 0 V LOW automatic park and brake Controlled modes FRICTION REDUCTION SPINDLE DISABLE Pulling FREDENA HIGH activates the friction reduction mode of the TDA5341. In that mode, a clock signal fed via pin TESTIN will cause the MOT outputs to sequentially switch-on and switch-off at the same frequency and, as a result, generate an AC spindle torque high enough to overcome the head stiction. The spindle circuitry is switched off when bit 23 (SPINDLE DISABLE) of the serial port is pulled HIGH. In that mode, the reference band gap generator is cut off so that all internal current sources are disabled. Both the spindle and actuator outputs will be set to the high impedance state because the upper converter is also turned off. Before start-up, the head stiction might be higher than normal due to condensation between the head(s) and the disk(s). Normal spin-up is not possible when this friction torque is higher than the start-up torque of the spindle motor. Spin-up is then only possible after friction has been reduced by breaking the head(s) free. Bringing a static friction system into mechanical resonance is an effective method to break static friction head(s) free. It should be noted that the uncommitted operational amplifier is also disabled in that mode. VCM DISABLE The actuator will be disabled when bit 22 (VCM DISABLE) is set to logic 1; the spindle circuitry is not affected in that mode. The retract circuitry also remains active, so that the heads can be parked although the VCM is disabled. In that mode, the current consumption can be reduced by ±4 mA. The resonance frequency is: 1 C f res = ------- × 0.5 ---- 2π J SLEEP MODE Where: The sleep mode is obtained by pulling both the SPINDLE and VCM DISABLE bits of the serial port HIGH. The power monitor circuitry only remains active in sleep mode. C = Stiffness of the head-spring(s) in direction of disk(s) rotation, (N/m) J = Inertia of the disk(s), (kg/m2). The external clock input frequency must be: 6 C f clk = ------- × 0.5 ---- 2π J RETRACT Retract is activated by pulling either bit 21 (PARK) HIGH or RETRACT (pin 30) LOW. When RETRACT is set LOW, a voltage of 0.65 V is applied to pin VCM− for parking. A burst of n × 6 clock pulse will bring the system into resonance and break the heads free (n > 2). Once the heads have been broken free, the normal spin-up procedure can be applied. It should be noted that the park voltage can be made adjustable by changing one of the interconnect masks. Accordingly, some different voltages, varying from 0.2 to 1.2 V, can quickly be obtained on customer demand. This mode does not affect the control of the spindle rotation. It should be noted that the clock frequency must be smaller than 40000/CAPCDM (nF). BRAKE MODE The brake mode is activated by pulling BRAKE (pin 11) LOW. When a voltage of less than 0.8 V is applied to pin BRAKE, the 3 motor outputs are short-circuited to ground, which results in a quick reduction of the speed until the motor stops completely. 1997 Jul 10 8 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 The system will only function when the EMF voltage from the motor is present. Consequently, a start oscillator is provided that will generate commutation pulses when no zero-crossings in the motor voltage are available. Uncontrolled modes POWER SHUT-DOWN If the power supply decreases to less than the voltage threshold determined by the ratio between R1 and R2 connected to UVDIN2 (see Fig.8) (for more than 1 µs), the TDA5341 will issue a reset (RESETOUT goes LOW) and the following operation will start: A timing function is incorporated into the device for internal timing and for timing of the reverse rotation detection. The TDA5341 also contains a control amplifier, directly driving output amplifiers. • Firstly, the MOT outputs are switched to the high impedance state so as to get back the rectified EMF issued from the motor itself. At the same time, the voltage upper converter is cut off in order to preserve the voltage on the charge pump capacitance at CAPCP. The energy supplied in that way is then used to park the heads in a safe position The TDA5341 also provides access to the user of some of its internal test modes. Firstly, a PRESET mode can be used for prepositioning the three motor output drivers into a fixed state. By pulling pin PRESET to 0.75 V above VDD, MOT3 goes HIGH, MOT2 goes LOW and MOT1 goes to the high impedance state. • Secondly, after a certain period of time, depending on the RC constant of the device connected to BRAKEDELAY, the lower MOS drivers will be turned on in order to stop the motor completely. In addition, when TESTIN is pulled HIGH (provided that FREDENA is LOW), the 3 motor output drivers are switched off. It should be noted that RESETOUT goes LOW in that particular event. THERMAL SHUT-DOWN Adjustments Should the temperature of the chip exceed +140 ±10 °C, a shut-down operation will also be processed. The actions described for power shut-down will be sequenced in the same manner. The system has been designed in such a way that the tolerances of the application components are not critical. However, the approximate values of the following components must still be determined: • The start capacitor; this determines the frequency of the start oscillator SPINDLE SECTION (see Fig.1) Full-wave driving of a three-phase motor requires three push-pull output stages. In each of the six possible states two outputs are active, one sourcing current and one sinking current. The third output presents a high impedance to the motor which enables measurement of the motor EMF in the corresponding motor coil by the EMF comparator at each output. The commutation logic is responsible for control of the output transistors and selection of the correct EMF comparator. • The two capacitors in the adaptive commutation delay circuit; these are important in determining the optimum moment for commutation, depending on the type and loading of the motor The zero-crossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment for the next commutation, i.e. the change to the next output state. The delay is calculated (depending on the motor loading) by the adaptive commutation delay block. This capacitor determines the frequency of the start oscillator. It is charged and discharged, with a current of 5.5 µA, from 0.05 to 2.2 V and back to 0.05 V. The time taken to complete one cycle is given by: • The timing capacitor; this provides the system with its timing signals. The start capacitor (CAPST) tstart = (0.78 × C); where C is given in µF. The start oscillator is reset by a commutation pulse and so is only active when the system is in the start-up mode. A pulse from the start oscillator will cause the outputs to change to the next state (torque in the motor). If the movement of the motor generates enough EMF the TDA5341 will run the motor. Because of high inductive loading the output stages contain flyback diodes. The output stages are also protected by a current limiting circuit and by thermal protection of the six output transistors. The zero-crossings can be used to provide speed information such as the tacho signal (FG). 1997 Jul 10 9 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control During the next commutation period this capacitor (CAPCDM) is discharged at twice the charging current. The charging current is 10 µA and the discharging current 20 µA; the voltage range is from 0.87 to 2.28 V. The voltage must stay within this range at the lowest commutation frequency of interest, fC1: If the amount of EMF generated is insufficient, then the motor will move one step only and will oscillate in its new position. The amplitude of the oscillation must decrease sufficiently before the arrival of the next start pulse, to prevent the pulse arriving during the wrong phase of the oscillation. The oscillation of the motor is given by: 1 --- f osc TDA5341 –6 10 × 10 7092 C = ------------------------ = ------------f × 1.41 f C1 P 2 0.5 = -------- × K t × I × ---- J Π Where C is in nF. Where: Kt = torque constant (N.m/A) If the frequency is lower, then a constant commutation delay after the zero-crossing is generated by the discharge from 2.28 to 0.87 V at 20 µA. I = current (A) p = number of magnetic pole-pairs Maximum delay = (0.070 × C) ms: Where C is in nF. J = inertia J (kg/m2). Example: nominal commutation frequency is 3240 Hz and the lowest usable frequency is 1600 Hz, thus CAPCDM = 7092/1600 = 4.43 (choose 4.7 nF) Example: J = 6.34 × 10−7 kg/m2, K = 4.5 × 10−3 N.m/A, p = 6 and I = 0.48 A; thus fosc = 22.7 Hz. Without damping, a start frequency of 48.4 Hz can be chosen or t = 24 ms, thus C = 0.024/0.78 = 0.031 µF, (choose 33 nF). The other capacitor, CAPCDS, is used to repeat the same delay by charging and discharging with 20 µA. The same value can be chosen as for CAPCDM. Figure 3 illustrates typical voltage waveforms. The Adaptive Commutation Delay (CAPCDM and CAPCDS) In this circuit capacitor CAPCDM is charged during one commutation period, with an interruption of the charging current during the diode pulse. handbook, full pagewidth voltage on CAPCDM voltage on CAPCDS MGE820 Fig.3 CAPCDM and CAPCDS voltage waveforms in normal running mode. 1997 Jul 10 10 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 The capacitor is charged, with a current of 60 µA, from 0.03 to 0.3 V. Above this level it is charged, with a current of 5 µA, up to 2.2 V only if the selected motor EMF remains in the wrong polarity (watchdog function). At the end, or, if the motor voltage becomes positive, the capacitor is discharged with a current of 30 µA. The watchdog time is the time taken to charge the capacitor, with a current of 5 µA, from 0.3 to 2.2 V. The value of CAPTI is given by: tm –6 C = 5 × 10 × ------- = 2.63t m 1.9 The Timing Capacitor (CAPTI) Capacitor CAPTI is used for timing the successive steps within one commutation period; these steps include some internal delays. The most important function is the watchdog time in which the motor EMF has to recover from a negative diode pulse back to a positive EMF voltage (or vice-versa). A watchdog timer is a guarding function that only becomes active when the expected event does not occur within a predetermined time. Where: C is in nF and t is in ms. The EMF usually recovers within a short time if the motor is running normally (<<ms). However, if the motor is motionless or rotating in the reverse direction, then the time can be longer (>>ms). Example: If, after switching off, the voltage from a motor winding is reduced, in 3.5 ms, to within 10 mV (the offset of the EMF comparator), then the value of the required timing capacitor is given by: A watchdog time must be chosen so that it is long enough for a motor without EMF (still) and eddy currents that may stretch the voltage in a motor winding. However, it must be short enough to detect reverse rotation. If the watchdog time is made too long, then the motor may run in the wrong direction (with little torque). C = 2.63 × 3.5 = 9.2 (choose 10 nF) Typical voltage waveforms are illustrated by Fig.4. handbook, full pagewidth VMOT1 voltage on CAPTI MGE821 If the chosen value of CAPTI is too small, then oscillations can occur in certain positions of a blocked rotor. If the chosen value is too large, then it is possible that the motor may run in the reverse direction (synchronously with little torque). Fig.4 Typical CAPTI and VMOT1 voltage waveforms in normal running mode. 1997 Jul 10 11 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 Other design aspects Current limiting There are other design aspects concerning the application of the TDA5341 besides the commutation function. They are as follows: Outputs MOT1 to MOT3 are protected against high currents in two ways; current limiting of the ‘lower’ output transistor and current limiting of the ‘upper’ one. This means that the current from and to the output stages is limited. • Generation of the tacho signal FG • Motor control It is possible to adjust the limiting current externally by using an external resistor connected between pin ILIM and ground, the value is determined by the formula: 2.54 I ILIM = 10020 × ----------R • Current limiting • Thermal protection. FG signal The FG signal is generated in the TDA5341 by using the zero-crossing of the motor EMF from the three motor windings and the commutation signal. Where R = R (min.) = 19.5 kΩ and IILIM = 1.3 A. If R < 19.5 kΩ, then IILIM is internally limited for device protection purposes. Output FG switches from HIGH-to-LOW on all zero-crossings and LOW-to-HIGH on all commutations and can source more than 40 µA and sink more than 1.6 mA. Thermal protection Thermal protection of the six output transistors of the spindle section is achieved by each transistor having a thermal sensor that is active when the transistor is switched on. The transistors are switched off when the local temperature becomes too high. In that event, a RESET is automatically generated to the external world by pulling RESETOUT LOW. Example: A three-phase motor with 6 magnetic pole-pairs at 1500 rpm and with a full-wave drive has a commutation frequency of 25 × 6 × 6 = 900 Hz and generates a tacho signal of 900 Hz. Motor control Figure 5 shows the spindle transconductance by giving the relative output current as a function of the voltage applied to pin CNTRL. This circuit provides the following: • An external signal that sends a RESETOUT (active LOW) to the disk drive circuitry at power-up and power-down • Causes actuator to retract (PARK). MGE822 handbook, halfpage Io Reset section 100 The power-up reset signal (RESETOUT) applied to external circuits as a digital output is typically 150 ms after power-up. In the same way, as soon as VDD goes below a threshold that is externally set (UVDIN2), RESETOUT goes LOW. The under voltage detection threshold is adjustable with external resistors (see Fig.8). (% of Imax) 80 60 The reset circuitry has a minimum output pulse (100 ms) even for brief power interruptions (higher than 1 ms). The pulse duration can be adjusted with an external capacitor (UVDIN1). 40 20 0 0 1 2 5 3 4 control voltage (V) Fig.5 Output current control. 1997 Jul 10 12 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control The power for retraction is received from the rectification of the EMF of the spindle before it is spun down. After retraction, a brake procedure is automatically settled. The time needed for retraction, prior to braking, can be precisely adjusted with the external RC device connected to pin BRAKEDELAY. The discharge of the capacitance across the resistance from VDD − 0.7 V down to 1 V will provide the desired time constant. TDA5341 An operational amplifier input allows passive external components for compensation and gain setting. The compensation amplifier is able to be pulled out of a saturation state within 5 µs and its output swing is VDD − 1.5 V. An actuator current-sense amplifier is provided for use by the disc drive controller. The gain from current-sense resistor to sense the amplifier output is typically 10 (±3%) and the output voltage swing is ±1.25 V. An input common mode range insures operation through all normal coil voltage excursions. Maximum recovery time from saturation is 20 µs (typ.). Actuator section The actuator driver has a control input voltage that is proportional to the actuator current which is capable of a closed-loop band-pass frequency higher than 10 kHz. TRANSFER FUNCTION handbook, full pagewidth actuator CL1 CL2 Rs RIN1 input FB2 RIN2 FB1 VCM− VCM+ SENSEIN− SENSEIN+ VCMIN2 GAINSEL Rf VCMIN1 PREAMP Vref SENSEOUT OUTPUT GAIN 11 SENSE AMP TDA5341 MGE825 Fig.6 VCM section application diagram. 1 T = – 11 × R f × Z L × -------------------------------------------------------------------------------------------------------------------- R IN × ( R f × R s + R f × Z VCM + 110 × R s × Z L ) With GAINSEL = HIGH; RIN = RIN1 R IN1 × R IN2 With GAINSEL = LOW; R IN = -----------------------------R IN1 + R IN2 1997 Jul 10 13 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control Speed control function Serial port Speed control is efficiently achieved by the frequency-locked loop circuitry which is enabled by bit D20 of the CONTROL register. The serial port operates as follows: When ENABLE is HIGH, the serial port is disabled, which means the TDA5341 functions regardless of any change at pins DATA and CLOCK. Its aim is to keep the tachometer signal set to a reference programmed by the user via the serial port (see Section “Serial port”). When ENABLE is set LOW some set-up time before the falling edge of CLOCK, the serial port is enabled, i. e. data is serially shifted into the 24-bit shift register on the falling edge of the CLOCK signal. The least significant bit (LSB = DATA 0) is the first in, DATA(23) the MSB is the last in. The FLL operates as follows: When power is first applied to the circuit, the FILTER pin is pulled HIGH so that maximum output current can be sourced for optimum torque. When ENABLE goes HIGH, the contents of the shift register are loaded into the internal fixed register (CONTROL register), it will not change until the next rising edge of ENABLE. FG pulses will appear rapidly so as to provide a ‘clean’ clock signal (FMOT) that will issue one pulse per mechanical revolution. This may be used for speed regulation, by re-entering the signal through the DPULSE pin. Then, after it has been synchronised to the ROSC clock, it is compared to an accurate reference derived from the ROSC clock and programmed by the user via the serial port. The resulting variation in frequency generates a speed error term that will switch a charge-pump up or down in order to charge or discharge an external RC filter (FILTER). The voltage at the FILTER pin is then used as an input to the current control amplifier that regulates the current in both upper and lower NMOS transistors. It should be noted that when RESET goes HIGH it will force all bits of the shift register and the control register to logic 0. However, there is no reset effect on both power-up and power-down i.e there is no correlation between RESET and RESETOUT. CLOCK can be stopped (either in the HIGH or LOW state) once RESET or ENABLE have been asserted. The 24-bit control register is organized as follows: • D23: SPINDLE DISABLE A velocity regulation based upon (maximum) one corrective action per mechanical revolution may be considered insufficient in some applications. That is the reason why the second input of the FLL circuitry was intentionally left open-circuit and directly accessible to the external world via pin DPULSE. In that way, total freedom is given to the user to use any signal coming out of the microcontroller in order to regulate the motor velocity with a finer accuracy. – When LOW, the spindle circuitry is enabled • D22: VCM DISABLE – When LOW, the actuator circuitry is enabled • D21: PARK – When HIGH, it enables the head retraction. This has the same effect as pin RETRACT pulled LOW • D20: FLL ENABLE Moreover, a mixed regulation is also possible: firstly, the FMOT signal is fed via DPULSE into the FLL circuitry and then once data is read out off the disc, it is switched to another clock signal with a higher frequency than FMOT. Simultaneously, a new division factor is programmed via the serial port. – When HIGH, it closes the complete speed regulation loop – When LOW, it will set the output of the charge pump (FILTER) to the high impedance state • D19 and D18 – The combination of these bits fixes the division factor to apply on the FG signal with respect to the number of poles. It should be noted that there is no need for external synchronization. However, it is recommended to change the division factor and the DPULSE clock rate during the period when FMOT is HIGH. 1997 Jul 10 TDA5341 14 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control Table 3 Division factor D19 D18 POLE PAIRS 0 0 4 0 1 6 1 0 8 1 1 12 TDA5341 Example: for a motor speed of 3600 rpm and a reference oscillation ROSC of 16 MHz, the division factor that has to be programmed via the bus, will be: –6 16 × 10 DIV = 7.5 × ------------------------ = 33333 3600 The resulting error will be less than 0.04 rpm. • D17 to D0 These bits program the division factor to apply to the ROSC signal so as to generate a reference that will precisely control the spindle rotation; – The division factor can range from 8 (DIV = 1) to 8 × [218 − 1] = 2097144 (DIV = 3FFFF) – The relationship between this division factor, ROSC and the motor frequency is as follows: DIVISION FACTOR = 7.5 × ROSC/MOTOR speed where the MOTOR speed is given in rpm and ROSC in Hz. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER MIN. MAX. UNIT VDD positive supply voltage − 5.5 Vi input voltage (all pins) −0.3 VDD + 0.3 V V V60,8,21 output voltage pins MOT1, MOT2 and MOT3 −0.25 +5.5 V45,37,53 output voltage pins VCM−, VCM+ and SENSEOUT 0.7 VDD + 0.7 V V1,2,18,19 input voltage pins CAPST, CAPTI, CAPCDM and CAPCDS − 2.5 V Tstg IC storage temperature −55 +150 °C Tamb operating ambient temperature 0 +70 °C Ptot total power dissipation V see Fig.7 HANDLING Every pin withstands the ESD test in accordance with MIL-STD-883C. Method 3015 (HBM 1900 Ω, 100 pF) 3 pulses positive and 3 pulses negative on each pin with reference to ground. Class 1 : 0 to 1999 V. THERMAL CHARACTERISTICS SYMBOL Rth j-a 1997 Jul 10 PARAMETER thermal resistance from junction to ambient in free air 15 VALUE UNIT 54 K/W Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 MGE823 3 handbook, halfpage Ptot (W) (2) 2 (1) 1 SAFE OPERATING AREA 0 0 50 100 Tamb (°C) 150 (1) Tj(max) = 130 °C. (2) Tj(max) = 150 °C. Fig.7 Power derating curve. CHARACTERISTICS (SPINDLE FUNCTION) VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VDD general supply voltage 4.5 5.0 5.25 V VDD1 supply voltage 1 for the spindle motor drivers 4.5 5.0 5.25 V VDD2 supply voltage 2 for the spindle motor drivers 4.5 5.0 5.25 V VDD3 supply voltage for the actuator driver 4.5 5.0 5.25 V IDD general supply current − 11 15 mA Iq(sm) quiescent current in sleep mode − 1.4 2 mA 130 140 150 °C − TSD − 30 − °C 2.5 − − V Thermal protection TSD local temperature at temperature sensor causing shut-down ∆T reduction in temperature before switch-on Vso test pin switch-off voltage 1997 Jul 10 after shut-down 16 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PARAMETER TDA5341 CONDITIONS MIN. TYP. MAX. UNIT MOT0 Vi input voltage level −0.3 − VDD − 1.7 V Ibias input bias current −1 − 0 µA VCSW comparator switching voltage level ±6.8 ±9.2 ±11.6 mV ∆VCWS variation in comparator switching voltage levels within one IC −3.4 − +3.4 mV Io = 250 mA − − 0.34 V Io = 250 mA; Tamb = 70 °C − − 0.39 V note 1 MOT1, MOT2 and MOT3; pins 60, 8 and 21 VDO drop-out voltage tr output rise time from 0.2 to 0.8VDD 10 25 35 µs tf output fall time from 0.8 to 0.2VDD 10 25 35 µs Output current limiting circuit; VILIM = 5 V; pin 23 IILIM limiting current (estimation) RILIM = 20 kΩ 1.15 1.25 1.35 A VILIM input voltage IILIM = 100 µA 2.43 2.51 2.60 V IILIM(CR) limiting current control range (estimation) Io I ILIM = --------------10000 0.01 − 1.3 A Output current control circuit; pin 24 VCNTRL input voltage level 0 − VDD V CCPC control loop stability capacitor − 100 − nF CAPCPC; pin 22 Io(sink) output sink current 30 40 50 µA Io(source) output source current −5.5 −3.5 −1.5 µA CAPCP; pin 27 CextCP external output capacitor for the charge pump note 2 22 − − nF Io(sink) output sink current VDD = 0 V; Vclamp = 1.2 V − 1 2.5 µA VCP charge pump voltage 9.0 9.9 10.8 V CAPST; pin 1 Io(sink) output sink current 4.5 6.0 7.5 µA Io(source) output source current −7.0 −5.5 −4.0 µA VSW(L) lower switching level − 0.20 − V VSW(M) middle switching level − 0.30 − V VSW(H) upper switching level − 2.20 − V 1997 Jul 10 17 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PARAMETER TDA5341 CONDITIONS MIN. TYP. MAX. UNIT CAPTI; pin 2 Io(sink) output sink current 25 35 45 µA IoH(source) HIGH level output source current −85 −70 −55 µA IoL(source) LOW level lower source current −7.5 −5.0 −2.5 µA VSW(L) lower switching level − 30 − mV VSW(M) middle switching level − 0.3 − V VSW(H) upper switching level − 2.2 − V CAPCDM; pin 18 Io(sink) output sink current 13 20 27 µA Io(source) output source current −13.5 −10 −6.5 µA Isink/Isource ratio of sink-to-source current −2.2 −2.0 −1.8 VIL LOW level input voltage 0.82 0.87 0.92 V VIH HIGH level input voltage 2.20 2.28 2.37 V CAPCDS; pin 19 Io(sink) output sink current 13 20 27 µA Io(source) output source current −27 −20 −13 µA Isink/Isource ratio of sink-to-source current −1.1 −1.0 −0.9 µA VIL LOW level input voltage 0.82 0.87 0.92 V VIH HIGH level input voltage 2.20 2.28 2.37 V FG; pin 10 VOL LOW level output voltage Io = 0 µA − − 0.5 V IOL LOW level output current VOL = 1 V 3.3 5.3 − mA IOH HIGH level output current VOH = 4.5 V − −83 −40 mA RF ratio of FG frequency and commutation frequency − 1 − δ duty factor − 50 − % BRAKE; pin 11 INM normal mode current −40 −27 − µA VNM normal mode voltage 2.65 − VDD V VBM brake mode voltage − − 2.35 V IBM brake mode current −40 −24 − µA VNM = 2.8 V Upper converter; pins 61 and 62 CXA external pump capacitor pin 61 − 10 − nF CYA external pump capacitor pin 62 − 10 − nF Notes 1. Switching levels with respect to MOT1, MOT2 and MOT3. 2. CAPCP value is dependant of the powerless park and brake operations. 1997 Jul 10 18 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 CHARACTERISTICS (RESET FUNCTION) VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT UVDIN1; pin 44 IUVDIN1 load capacitance current to control the reset pulse width −2.3 −1.7 −1.3 µA VUVDIN1 input voltage threshold to activate the reset output 2.4 2.55 2.75 V UVDIN2; pin 54 VUVDIN2 comparator voltage for power-up and power-down detection see Fig.8 1.280 1.315 1.340 V IUVDIN2 input current VUVDIN2 = 1.6 V −0.5 − +0.5 µA RESETOUT; pin 43 VPTH power threshold voltage see Fig.9 − 4.25 − V tdPU power-up reset delay C = 0.1 µF; see Fig.9 100 150 200 ms tdPD power-down reset delay see Fig.9 − − 4 µs tPDW power-down reset pulse width see Fig.9 1.0 − 4 µs tW(min) minimum output pulse width C = 0.1 µF 100 − − ms Rpu pull-up resistance 6 10 14 kΩ VOL LOW level output voltage IOL = 8.5 mA − − 0.5 V R2 handbook, halfpage R1 VDD UVDIN2 MGE818 ( R2 + R1 ) under-voltage threshold = 1.32 × ----------------------------R1 Fig.8 Reset mode threshold. 1997 Jul 10 19 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 VDD handbook, full pagewidth VPTH VDD tPDW < 1.2 µs tdPU tPDW > 4 µs tdPD td VOH RESETOUT VOL tW(min) MGE819 Fig.9 Reset mode timing. CHARACTERISTICS (VCM FUNCTION) VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT SENSEIN− and SENSEIN+; pins 51 and 52 VCS common input sense voltage 0 − VDD V IiSENSE input sense current −250 − +250 µA SENSEOUT; pin 53 ∆VSENSE differential output voltage 0.5 Vref ±1.25 4.0 V IoSENSE output sense current −250 − +250 µA GSENSE sense amplifier gain 9.9 10.2 10.5 fco cross-over frequency Vo(os) output offset voltage tRSA recovery time from saturation Vref = 1.9 to 2.6 V ISENSEIN = 0 − 40 − MHz −66 − +66 mV − 20 − µs Vref; pin 36 Vref reference input voltage 1.9 − 2.6 V Iref reference input current −5 − +5 µA 1997 Jul 10 20 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PARAMETER TDA5341 CONDITIONS MIN. TYP. MAX. UNIT VCM+ and VCM−; pins 37 and 45 VCMdo drop-out voltage − 0.8 1.0 V IoLIM output current limiting 0.7 1.15 1.5 A Gv power amplifier voltage gain 9 − 12 VoPARK output park voltage − 0.75 − V V Io = 400 mA RL = 40 Ω; note 1 VCMIN1 and VCMIN2 Vi input voltage level 1.9 − 2.6 Iibias input bias current − − 0.25 µA Ii(os) input offset current − 25 − nA GAINSEL; pin 15 VIH HIGH level input voltage 2 − − V VIL LOW level input voltage − − 0.8 V IIH HIGH level input current −10 − +10 µA IIL LOW level input current −20 − +10 µA RSW switch resistance GAINSEL = LOW − − 40 Ω GAINSEL = HIGH 10 − − MΩ −5 − +5 mV VDD = 5.25 V ±0.4 − ±VDD − 0.45 V 10 − MHz FB1 and FB2; pins 28 and 29 Vi(os) input offset voltage ∆VFB feed-back differential output voltage fco cross-over frequency − IoFB feed-back output current −250 +250 µA tRSB recovery time from saturation − 5 − µs RSW switch resistance GAINSEL = LOW − − 40 Ω GAINSEL = HIGH 10 − − MΩ V RETRACT; pin 30 VIH HIGH level input voltage 2 − − VIL LOW level input voltage − − 0.8 V IIH HIGH level input current −10 − +10 µA IIL LOW level input current −20 − +10 µA BRAKEDELAY; pin 46 VBM brake mode threshold voltage − 0.75 1.0 V VNM normal mode voltage VDD − 0.85 − − V 1997 Jul 10 21 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PARAMETER TDA5341 CONDITIONS MIN. TYP. MAX. UNIT Uncommitted operational amplifier; pins 4 to 6 Vi(os) input offset voltage −3.5 − +3.5 mV Ii(bias) input bias current −250 − +250 nA Ii(os) input offset current − 25 − nA VCM common mode voltage 1.7 − 2.6 V GOL open loop gain − 68 − dB fco cross-over frequency − 10 − MHz VOL LOW level output voltage IOL = 250 µA − − 0.7 V VOH HIGH level output voltage IOH = −250 µA 4.3 − − V Note 1. This is the PARK default value. Other values can be obtained with a metal mask change. CHARACTERISTICS (SPEED CONTROL FUNCTION) VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT FILTER; pin 32 Io(sink) output sink current 80 100 120 µA Io(source) output source current −110 −90 −70 µA Isink/Isource ratio of sink-to-source current 0.9 1.1 1.2 ILO charge pump leakage current −5 − +5 nA DATA, RESET and ENABLE; pins 38, 57 and 42 VIL LOW level input voltage − − 0.8 V VIH HIGH level input voltage 2.4 − − V Ii input current − 0 − µA VIL LOW level input voltage − − 0.8 V VIH HIGH level input voltage 2.4 − − V fclk clock frequency − − 18 MHz VIL LOW level input voltage − − 0.8 V VIH HIGH level input voltage 2.4 − − V frefOSC reference oscillator frequency 1 − 20 MHz CLOCK; pin 39 ROSC; pin 48 DPULSE; pin 35 VIL LOW level input voltage − − 0.8 V VIH HIGH level input voltage 2.4 − − V fDPULSE data pulse frequency − − 10 MHz 1997 Jul 10 22 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control SYMBOL PARAMETER TDA5341 CONDITIONS MIN. TYP. MAX. UNIT FMOT; pin 58 VOL LOW level output voltage δ duty factor IOL = 500 µA − − 0.1 V − 50 − % Timing; see Fig.10 tsu1 ENABLE set-up time 8 − − ns tsu2 DATA set-up time 6 − − ns th DATA hold time 10 − − ns handbook, full pagewidth CLOCK tsu1 ENABLE tsu2 th DATA SHIFTED DATA MGE824 Fig.10 Timing diagram. 1997 Jul 10 23 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 APPLICATION INFORMATION +5 V handbook, full pagewidth VDD1 VDD2 VDD3 VDD VDDD 64 40 16 41 25 CNTRL 24 C2 C1 FILTER CLAMP1 CLAMP2 3 26 60 8 32 R1 21 FREDENA CLOCK DATA ENABLE RESET ROSC to microcontroller TESTIN RESETOUT BRAKE FG FMOT DPULSE CAPCP CAPXA CAPXB CAPYA CAPYB CAPCDM CAPCDS CAPTI CAPST 7 9 23 MOT1 MOT2 SPINDLE MOTOR MOT3 MOT0 ILIM 39 22 38 CAPCPC 42 44 57 UVDIN1 48 12 54 UVDIN2 +5 V 43 11 TDA5341 10 30 58 15 35 45 37 27 51 61 52 59 53 62 33 63 28 18 34 19 29 2 46 1 50 14 55 31 49 17 VEED VEE1 VEE2 VEE3 VEE4 VEE RETRACT GAINSEL VCM− Rs VCM+ SENSEIN− SENSEIN+ Rf SENSEOUT RIN1 VCMIN1 FB1 CL1 RIN2 VCMIN2 FB2 CL2 BRAKEDELAY 36 Vref MGE826 Fig.11 Application diagram of the TDA5341 in a hard disk drive. 1997 Jul 10 24 input Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 PACKAGE OUTLINE LQFP64: plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm SOT314-2 c y X A 48 33 49 32 ZE e Q E HE A A2 (A 3) A1 wM θ bp pin 1 index 64 Lp L 17 detail X 16 1 ZD e v M A wM bp D B HD v M B 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e mm 1.60 0.20 0.05 1.45 1.35 0.25 0.27 0.17 0.18 0.12 10.1 9.9 10.1 9.9 0.5 HD HE 12.15 12.15 11.85 11.85 L Lp Q v w y 1.0 0.75 0.45 0.69 0.59 0.2 0.12 0.1 Z D (1) Z E (1) θ 1.45 1.05 7 0o 1.45 1.05 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC JEDEC EIAJ ISSUE DATE 94-01-07 95-12-19 SOT314-2 1997 Jul 10 EUROPEAN PROJECTION 25 o Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control If wave soldering cannot be avoided, the following conditions must be observed: SOLDERING Introduction • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. • The footprint must be at an angle of 45° to the board direction and must incorporate solder thieves downstream and at the side corners. Even with these conditions, do not consider wave soldering LQFP packages LQFP48 (SOT313-2), LQFP64 (SOT314-2) or LQFP80 (SOT315-1). This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “IC Package Databook” (order code 9398 652 90011). During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Reflow soldering Reflow soldering techniques are suitable for all LQFP packages. Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 °C within 6 seconds. Typical dwell time is 4 seconds at 250 °C. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 °C. Repairing soldered joints Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. Wave soldering Wave soldering is not recommended for LQFP packages. This is because of the likelihood of solder bridging due to closely-spaced leads and the possibility of incomplete solder penetration in multi-lead devices. 1997 Jul 10 TDA5341 26 Philips Semiconductors Product specification Brushless DC motor and VCM drive circuit with speed control TDA5341 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1997 Jul 10 27 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. Box 213, Tel. +43 160 1010, Fax. +43 160 101 1210 Belarus: Hotel Minsk Business Center, Bld. 3, r. 1211, Volodarski Str. 6, 220050 MINSK, Tel. +375 172 200 733, Fax. +375 172 200 773 Belgium: see The Netherlands Brazil: see South America Bulgaria: Philips Bulgaria Ltd., Energoproject, 15th floor, 51 James Bourchier Blvd., 1407 SOFIA, Tel. +359 2 689 211, Fax. +359 2 689 102 Canada: PHILIPS SEMICONDUCTORS/COMPONENTS, Tel. +1 800 234 7381 China/Hong Kong: 501 Hong Kong Industrial Technology Centre, 72 Tat Chee Avenue, Kowloon Tong, HONG KONG, Tel. +852 2319 7888, Fax. +852 2319 7700 Colombia: see South America Czech Republic: see Austria Denmark: Prags Boulevard 80, PB 1919, DK-2300 COPENHAGEN S, Tel. +45 32 88 2636, Fax. +45 31 57 0044 Finland: Sinikalliontie 3, FIN-02630 ESPOO, Tel. +358 9 615800, Fax. +358 9 61580920 France: 4 Rue du Port-aux-Vins, BP317, 92156 SURESNES Cedex, Tel. +33 1 40 99 6161, Fax. +33 1 40 99 6427 Germany: Hammerbrookstraße 69, D-20097 HAMBURG, Tel. +49 40 23 53 60, Fax. +49 40 23 536 300 Greece: No. 15, 25th March Street, GR 17778 TAVROS/ATHENS, Tel. +30 1 4894 339/239, Fax. +30 1 4814 240 Hungary: see Austria India: Philips INDIA Ltd, Band Box Building, 2nd floor, 254-D, Dr. Annie Besant Road, Worli, MUMBAI 400 025, Tel. +91 22 493 8541, Fax. +91 22 493 0966 Indonesia: see Singapore Ireland: Newstead, Clonskeagh, DUBLIN 14, Tel. +353 1 7640 000, Fax. +353 1 7640 200 Israel: RAPAC Electronics, 7 Kehilat Saloniki St, PO Box 18053, TEL AVIV 61180, Tel. +972 3 645 0444, Fax. +972 3 649 1007 Italy: PHILIPS SEMICONDUCTORS, Piazza IV Novembre 3, 20124 MILANO, Tel. +39 2 6752 2531, Fax. +39 2 6752 2557 Japan: Philips Bldg 13-37, Kohnan 2-chome, Minato-ku, TOKYO 108, Tel. +81 3 3740 5130, Fax. +81 3 3740 5077 Korea: Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL, Tel. +82 2 709 1412, Fax. +82 2 709 1415 Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR, Tel. +60 3 750 5214, Fax. +60 3 757 4880 Mexico: 5900 Gateway East, Suite 200, EL PASO, TEXAS 79905, Tel. +9-5 800 234 7381 Middle East: see Italy Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB, Tel. +31 40 27 82785, Fax. +31 40 27 88399 New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND, Tel. +64 9 849 4160, Fax. +64 9 849 7811 Norway: Box 1, Manglerud 0612, OSLO, Tel. +47 22 74 8000, Fax. +47 22 74 8341 Philippines: Philips Semiconductors Philippines Inc., 106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI, Metro MANILA, Tel. +63 2 816 6380, Fax. +63 2 817 3474 Poland: Ul. Lukiska 10, PL 04-123 WARSZAWA, Tel. +48 22 612 2831, Fax. +48 22 612 2327 Portugal: see Spain Romania: see Italy Russia: Philips Russia, Ul. Usatcheva 35A, 119048 MOSCOW, Tel. +7 095 755 6918, Fax. +7 095 755 6919 Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231, Tel. +65 350 2538, Fax. +65 251 6500 Slovakia: see Austria Slovenia: see Italy South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale, 2092 JOHANNESBURG, P.O. Box 7430 Johannesburg 2000, Tel. +27 11 470 5911, Fax. +27 11 470 5494 South America: Rua do Rocio 220, 5th floor, Suite 51, 04552-903 São Paulo, SÃO PAULO - SP, Brazil, Tel. +55 11 821 2333, Fax. +55 11 829 1849 Spain: Balmes 22, 08007 BARCELONA, Tel. +34 3 301 6312, Fax. +34 3 301 4107 Sweden: Kottbygatan 7, Akalla, S-16485 STOCKHOLM, Tel. +46 8 632 2000, Fax. +46 8 632 2745 Switzerland: Allmendstrasse 140, CH-8027 ZÜRICH, Tel. +41 1 488 2686, Fax. +41 1 481 7730 Taiwan: Philips Semiconductors, 6F, No. 96, Chien Kuo N. Rd., Sec. 1, TAIPEI, Taiwan Tel. +886 2 2134 2865, Fax. +886 2 2134 2874 Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd., 209/2 Sanpavuth-Bangna Road Prakanong, BANGKOK 10260, Tel. +66 2 745 4090, Fax. +66 2 398 0793 Turkey: Talatpasa Cad. No. 5, 80640 GÜLTEPE/ISTANBUL, Tel. +90 212 279 2770, Fax. +90 212 282 6707 Ukraine: PHILIPS UKRAINE, 4 Patrice Lumumba str., Building B, Floor 7, 252042 KIEV, Tel. +380 44 264 2776, Fax. +380 44 268 0461 United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes, MIDDLESEX UB3 5BX, Tel. +44 181 730 5000, Fax. +44 181 754 8421 United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409, Tel. +1 800 234 7381 Uruguay: see South America Vietnam: see Singapore Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD, Tel. +381 11 625 344, Fax.+381 11 635 777 For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 Internet: http://www.semiconductors.philips.com © Philips Electronics N.V. 1997 SCA55 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 297027/1200/01/pp28 Date of release: 1997 Jul 10 Document order number: 9397 750 02621