STCC05-B ® HOME APPLIANCE CONTROL CIRCUIT APPLICATIONS ■ ■ ■ ■ Home Appliance digital control AC Power drive and functional safety management Air Conditioner, Refrigerator and Oven applications Compressor, fan, heater and valve drive circuit FEATURES ■ Wide range input supply voltage operation: 7 to 18V ■ 5 V +/- 5% full tolerance voltage regulator and 50mA output current DIP-20 ■ MCU reset circuit with activation delay time and hysteresis (3.75V Hi, 3.4V Lo) Table 1. Order Code ■ 30µs digitally filtered inverting Zero Voltage Synchronization Part Number Marking ■ Three 50mA relay coil drivers with demagnetizSTCC05-BD4 STCC05-B ing diode ■ One 150mA relay coil driver with demagnetizing diode for a 20A relay ■ One 30mA peak enhanced buzzer driver with enable pin and soft turn off ■ 12 to 5V robust non inverting level shifter for speed sensor or door switch interface ■ Ambient temperature: - 20 to 85°C BENEFITS ■ Higher module compactness with reduced component count ■ Drastic reduction of soldered pins on the board for lower use of lead metal ■ Faster module assembly time ■ High transient burst immunity and ESD robustness compliant with IEC61000-4 standards ■ Enhanced functional reliability ■ Enhanced circuit parametric quality ■ Easy to design for short time to market Figure 1: STCC05 based Air Conditioner application diagram STCC05 VPS COMPRESSOR RELAY V PS RL 4 IN4 RL3 P04 20A RELAY DRIVER V PS IN3 P03 RELAY DRIVER V PS RL2 POWER RELAYS IN2 P02 RELAY DRIVER V PS RL1 IN1 P01 RELAY DRIVER BZ2 ENBZ V PS P06 RS BUZZER BUZZER DRIVER BZ1 VDD INBZ PWM VPS V PS V PS V DD VDD 5V REGULATOR SMPS COM RESET ZERO VOLTS SYNC. SYN ZVS LEVEL SHIFTER INS OUTS P07 EMI FILTER MCU CUP RINS AC Line CDD /RS T NMI 30µs FILTER VPS VSS RST\ VPS JP SPEED SENSOR October 2004 REV. 1 1/13 STCC05-B Figure 2. Block diagram Figure 3. Pin-out connections VPS RL4 20A RELAY DRIVER VPS RL3 RELAY DRIVER IN4 VPS 1 20 VDD IN3 SYN 2 19 /RST IN2 INS 3 18 ZVS IN1 RL1 4 17 OUTS RL2 5 16 IN1 RL3 6 15 IN2 RL4 7 14 IN3 BZ1 8 13 IN4 BZ2 9 12 INBZ 10 11 COM VPS RL2 RELAY DRIVER VPS RL1 RELAY DRIVER VPS BZ2 BUZZER DRIVER ENBZ INBZ BZ1 VPS VPS VDD 5V REGULATOR COM RST\ RESET ZERO VOLTS SYNC. SYN ZVS 30µs FILTER ENBZ LEVEL SHIFTER INS OUTS EMI FILTER FUNCTIONAL DESCRIPTION The STCC05 is a control circuit embedding most of the analog & power circuitry of an air conditioner or refrigirator control module. It interfaces the micro-controller MCU with the AC power and cooling process sections. The voltage supply The 5V voltage regulator supplies the micro-controller MCU. Its input voltage ranges from 7V to 18V; and its average DC output current up to 50mA. With an output filtering capacitor of 100µF, its output voltage accuracy is better than +/- 5% in the whole operating range of the ambient temperature TAMB, the load current IDD and the input voltage VPS , contributing directly to the ADC accuracy. The regulator includes also an over current limiter and a thermal shutdown. The over current limiter protects the regulator against output short circuits and inrush currents during the power up. The current limiter is made of a serial shunt resistance as current sensor and a circuit that regulates the input current. Moreover, the thermal shutdown protects the whole circuit against overload operations. It is made of a thermal sensing junction and a hysteresis comparator that is able to switch off the passing element. ■ RSENSE VPS VDD Thermal Shutdown VDD VDD VDD 1.25 V Reference R1 3kΩ VH = 3.75 V VDD /RST RUP > 100kΩ RESET VL R2 6kΩ VH VL = 3.40 V 2/13 MCU Over current Limiter CUP = 100nF STCC05-B ■ The reset circuit This circuit ensures a Low Voltage Detection (LVD) of the output of the regulator. Most micro-controllers have an active RESET pin in the low state: so, the /RST pin will be active at low state. The reset comparator senses the regulator voltage VDD. The /RST pin goes high when VDD is higher than the high threshold VH = 3.75V and after a delay time TUP; and is low when the VDD decreases below the low threshold VL = 3.4V after the delay time TDW. These delays are set by an external capacitor CUP connected to the /RST pin and depend on the trigger thresholds of /RST: For CUP = 100nF, TUP= 400µs with VTH= VH/2; TDW= 200µs with VTH= VL/2. ■ The Zero Voltage Synchronization ZVS circuit The Zero Voltage Synchronization ZVS circuit generates the signal ZVS that synchronizes the whole operation with the AC line cycle (20 ms on 50 Hz or 16.7 ms on 60 Hz). This signal allows the MCU to control the AC loads and achieve the timing functions. The input pin SYN is an image of the mains voltage. It is connected to either the power supply transformer through a resistor RZV or an opto-coupler that is controlled directly by the AC line voltage. The circuit is protected against fast line transient voltages: a robust ESD protection and a 30µs digital filter are implemented to provide a higher immunity to the MCU operation. Its output signal ZVS is inverted respect to the input signal VSYN. VDD 30 µs FILTER 25 kΩ S1 Q SYN 70 kΩ ZVS S2 30 kΩ COM ■ The relay coil drivers These robust circuits allow a DC relay coil to be driven by an MCU output. The relay coil has a minimum resistance of 580Ω and has a power up to 0.25W for VPS = 12 V. These characteristics are representative of 3A relays such as FTR-F3AA-12V or JQ1A-12V series. The output stage is made of a transistor and a demagnetization diode. The transistor is referred to the ground COM, has a DC current rating of 50mA; and its collector is connected to the output RLI (I=1, 2, 3). The diode is connected between the output pin RLI and the supply pin VPS. Moreover, a fourth coil driver has an extended 150mA current capability to be able to drive the coil of a relay having a 130Ω minimum resistance and a 1.1W maximum power. These characteristics are representative of 20A relays such as G4A-E-DC12, OMIF-S-112 or UKH12S series. 3/13 STCC05-B VPS VPS Demagnetizing Diode 4 kΩ INI 10 kΩ ROH = 1kΩ RL I VIN 10 kΩ BZ 2 ENBZ Relay Transistor RBZ= 1kΩ BZ 1 VIN INBZ The buzzer driver with enable control The MCU can excite a warning buzzer with a 50% PWM signal. The buzzer driver amplifies this signal in current and translates it from the 5V MCU output to the VPS supply to produce the right sound level from the buzzer. The output stage is made of a NPN transistor, a PNP transistor and two 1kΩ resistors. The NPN transistor, referred to the power ground COM, is controlled by the input INBZ; its collector is connected to the output BZ1. The input INBZ is driven by a simple push-pull MCU buffer. The PNP transistor, referred to the VPS polarity, is controlled by the input ENBZ; and its collector is connected to the output BZ2 through a 1kΩ resistor. The input ENBZ is driven by a simple push-pull MCU buffer. The pin BZ2 is the supply terminal of the buzzer; and the circuit has a DC current rating of 9mA and the PWM section runs from 10Hz up to 5kHz. A 1kΩ resistor RBZ is connected between the BZ1 and BZ2 pins to discharge the buzzer periodically. Moreover, the addition of an external capacitor-resistor network on BZ2 pin will allow the buzzer to turn on and off smoothly when the pin ENBZ is toggling. ■ ■ The speed sensor level shifter The OUTS signal is generated by an electronic signal such as the indoor fan speed clock issued of a Hall Effect sensor or a door switch signal and is transmitted to the MCU. As the INS input may be disturbed; a spike suppressor and a simple EMI filter are added to increase the input robustness. The output signal OUTS is not inverted with respect to the input signal INS. VDD VDD EMI Filter 50 kΩ 500Ω INS 50 kΩ 50 kΩ 4/13 OUT S STCC05-B Table 2: Absolute Ratings (limiting values) Symbol VDD VPS VSYN Pin VDD VPS, INS SYN BZ1, BZ2, RLx, x = 1 to 4 Parameter name & conditions Output supply voltage Power supply voltage, level shifter input ZVS input voltage, RZV = 15kΩ VI IN1, IN2, IN3 Input logic voltage VO ZVS, OUTS, /RST Output logic voltage VPS Maximum sourced current pulse, tp = 10ms Maximum sunk driver current pulse, tp = 10ms Maximum DC sunk current Maximum sunk driver current pulse, tp = 10ms Maximum DC sunk current Maximum diver diode reverse current Average output current Peak output current, tp = 50µs Maximum DC sunk current in all relay drivers VPS = 16V, TAMB= 70°C, IDD= 50mA, DIP-20 Maximum DC sunk current in all relay drivers VPS = 16V, TAMB= 85°C, IDD= 25mA, DIP-20 Maximum dissipation, DIP-20, TAMB= 70°C Operating ambient temperature Operating junction temperature Storage junction temperature VMO RLx, x = 1 to 3 IM RL4 IBZ AV IBZ PK RLx, x = 1 to 4 BZ1, BZ2 BZ1, BZ2 ΣIM RLx, l = 1 to 4 PDIS TAMB All AII TJ All Output voltage Value - 0.3 to 6 - 0.3 to 20 - 1 to 20 - 0.3 to VPS + 0.3 - 0.3 to VDD + 0.3 - 0.3 to VDD + 0.3 500 60 50 160 150 1 ±2 ± 50 Unit V V V V V V mA mA mA mA mA mA mA mA 220 mA 300 0.90 - 20 to 85 - 10 to 150 - 25 to 150 W °C °C °C Table 3: Electromagnetic Compatibility Ratings (TJ = 25°C, according to typical application diagram of page 1, unless otherwise specified) Symbol Node Parameter name & conditions Value VESD All pins ESD protection, MIL-STD 883 method 3015, HBM model ±2 VESD INS, SYN, VPS, VDD ESD protection, IEC 61000-4-2, per intput, in air (1) ±2 ESD protection, IEC 61000-4-2, per intput, in contact (1) ±2 VPPB All pins Total peak pulse voltage Burst, IEC 61000-4-4, (2) ±4 Unit kV Note 1: System oriented test circuit with RZV = 15kΩ, RINS = 2.2kΩ and CDD = CPS = 100nF Note 2: System oriented test circuit; refer to application section Table 4: Thermal Resistance Symbol Parameter Value Unit Rth(j-a) DIP-20 thermal resistance junction to ambient Single PCB with a copper thickness = 35µm and surface SCU = 0.5cm2 90 °C/W 5/13 STCC05-B Table 5: Electrical Characteristics (TJ = 25°C, VCC = 12V, unless otherwise specified) Symbol Pin Name Conditions Min. Typ Voltage supply IDD = 5 to 40mA Tamb = 0 to 70°C VPS = 9 to 16V CDD = 100µF VIN1 to 4 = 0V VDD VDD Output voltage supply VPS ISQ VPS VPS Input supply voltage Quiescent supply current IIN_SC VPS Limiting input current TOFF ∆T VDD V VH VL VHYS VDD Shutdown temperature Releasing thermal hysteresis Reset circuit Disabling reset threshold Enabling reset threshold Threshold hysteresis CUP = 100nF, VTH = VH/2, Disabling reset delay time RUP = 100kΩ TUP /RST TDW TD VTH ISYN VOH VOL IIN4 VON IINx VON VRL H VINx VINBZ FBUZ ROH 4.75 VDD = 5V, IDD = 0 (open) VDD = 0V Output in short circuit 50 BZ2 VON BZ1 VENBZ RBZ ENBZ 5 5.25 V 1.3 18 2 V mA 80 120 mA 170 15 °C °C 3.4 3.1 3.75 3.4 0.35 4 3.6 200 400 800 200 400 30 1.1 0.3 0.9 70 1.4 CUP = 100nF, VTH = VL/2, 100 RUP = 100kΩ Zero Voltage synchronization circuit ZVS Transition filtering time Rising and falling step 10 SYN Transition threshold 0.6 VSYN = 5V SYN Input nominal current VSYN = 18V Level shifter, zero voltage synchronization, reset circuits LVOUT High level output voltage 0.8 VDD /RST ZVS Low level output voltage INBZ Unit 7 Enabling reset delay time IN4 RL4 IN1 to 3 RL1 to 3 RL1 to 4 IN1 to 4 Max. Relay coil drivers VIN4 = 5V ION = 150mA, VIN4 > 3.1V VINx = 5V ION = 50mA, VINx > 3.1V VINx < 50.8V, RL = 580Ω Input activating current On state output voltage Input activating current On state output voltage Off state output voltage 0.9 VPS Transition threshold 0.8 Buzzer driver with enable control Input muting voltage 0.8 Buzzer PWM frequency Duty cycle = 50% 0.01 On state output resistance VINBZ = 0V, VENBZ > 3.1V, IBZ2 = 5mA On state output voltage ION = 25mA, VINBZ > 3.1V, VENBZ = 0V, tp = 50µs Enable threshold voltage 0.8 BZ1 - BZ2 Buzzer resistance V µs 1.5 µs V mA V 0.85 1 0.85 1 1.9 1.5 0.2 VDD V 1.4 1.2 1.4 1.2 VPS 3.1 mA V mA V V V 3.1 5 V kHz 1 kΩ 1 1.4 V 2 1 3.1 V kΩ 18 0.8 800 V V µA Speed sensor level shifter VINS H VINS L IINS 6/13 INS High level detection Low level detection Internal input current 7 VINS = 12V 500 STCC05-B DC CHARACTERISTICS Figure 4: Typical regulator voltage VDD variation versus its output current IDD at TJ = 25°C Figure 5: Typical regulator voltage VDD variation versus its junction temperature at VIN = 12V 5.2 Vdd (V) 5.1 5.05 5 Vdd (V) 5.025 4.9 4.8 5 4.7 4.975 4.6 4.5 4.95 4.4 Vin = 9V 4.3 Idd = 5mA 4.925 Vin = 16V 4.2 4.1 Idd (mA) -25 4 0 20 40 60 80 Idd = 40mA Tj(°C) 4.9 0 25 50 75 100 125 150 100 Figure 6: Typical relay driver RL (1 to 3) onstate voltage variation versus its current 1.1 Figure 7: Typical compressor relay driver RL4 onstate voltage variation versus its current 1.1 Von (V) Von (V) 1 1 0.9 0.9 0.8 0.8 0.7 0.7 Tj = -25ºC Tj = -25ºC Tj = 25ºC 0.6 0.6 Tj = 85ºC Tj = 25ºC Tj = 85ºC Ion (mA) Ion (mA) 0.5 0.5 0 10 20 30 40 50 0 50 100 150 AIR CONDITIONER APPLICATION CONSIDERATIONS ■ IMMUNITY IMPROVEMENT OF STCC05 AND THE MICROCONTROLLER Some basic rules can be applied to improve the STCC05 immunity in its application: - The power ground of VPS should be split from the signal ground of VDD, - The STCC05 is placed as close as possible of the MCU, - The supply capacitors would increase the system immunity by being placed closed to the blocks they feed, or putting decoupling capacitors (f.i. CDD = CPS = 100nF) - Large supply wire on the PCB should be avoided to reduce sensitivity to radiated interferences. - A decoupling capacitor can be put on the pin INS of the speed sensor interface and the MCU reset pin (f.i. CINS = 10nF; CUP = 100nF). (1) (2) (3) (4) Depending of the PCB layout quality, others capacitors may be put on sensitive pins such as the output regulator pin VDD and the zero crossing synchronization input pin SYN. 7/13 STCC05-B Figure 8: Example of PCB layout improvement for higher immunity 2 VPS VPS VDD VDD 5VREG 3 3 RST\ Reset RST\ 4 MCU SMPS STCC05 VSS COM 1 1 STCC05 ELECTROMAGNETIC COMPATIBILITY Standards such as IEC61000-4-x evaluate the electromagnetic compatibility of appliance systems. To test the immunity level of the STCC05 to the IEC61000-4-4 (Electrical Fast Transient Bursts), a board representative of usual application control unit should be considered by applying the immunity design rules defined in the previous paragraph. IEC61000-4-4 test does not allow any measurement equipment to be connected to the tested system, as it would corrupt the test results. That is why this board should include a remote monitoring circuit based on optic fibers. Thus, without any electrical link with an oscilloscope, it is possible to monitor the VDD voltage as well as the /RST or the ZVS outputs of the STCC05, during the IEC61000-4-4 test. This optical link detects parasitic commutations of outputs as short as 60ns. With this board, and the burst generator coupled to the mains as specified in the IEC61000-4-4 standard (see the following principle diagram), the STCC05 has been tested successfully at 4kV. ■ Figure 9: IEC61000-4-4 Electrical Fast Transient Burst general STCC05 test circuit Figure 10: Test circuit schematic MAINS TR1 15V 5VA VPS Rzv 15k Cps_1 100uF VDD Cps_2 100nF D1~D4 1N4002 U1 STCC05-B 1 2 MAINS FILTER L Czv 15nF 3 4 SPEED SENSOR MAINS VPS 5 PE Rins 2.2k 6 7 0.5 kV to 4 kV N Cins 10nF 8 BUZZER tr : 5ns tp : 50 ns BURST COUPLER RELAY 1 BURST GENERATOR VDD SYN RST INs ZVS RL1 OUTs RL2 IN1 RL3 IN2 RL4 IN3 BZ1 IN4 BZ2 INBZ ENbz COM Cdd_2 100nF RST 20 19 18 17 16 Cup 100nF ZVS LS SW1 15 14 VDD SW2 13 12 SW3 11 SW4 L PE 9 10 SYSTEM TESTED Cdd_1 100uF Vps RELAY 2 RELAY 3 COMPRESSOR RELAY STCC05 Rs 560 Cs 47uF BATTERY N VPS 9V5 Oscilloscope 10 cm Optical Receiver HFBR-0410 Optic Fiber Optical Transmitter VDD RST LS ZVS TEST BOARD 8/13 STCC05-B ■ STCC05 POWER PERFORMANCE VERSUS ITS THERMAL CAPABILITY Figure 11: Driver current sum versus regulator current at TAMB = 85°C for VPS = 12, 14, 16, 18V Figure 12: Driver current sum versus regulator current at TAMB = 70°C for VPS = 12, 14, 16, 18V Σ IM(A) Σ IM(A) 0.35 0.35 VPS=12V & 14V VPS=12V 0.3 0.25 0.3 0.25 VPS=14V VPS=16V 0.2 0.2 TAMB =85°C TAMB =70°C VPS=16V 0.15 0.15 VPS=18V 0.1 0 0.01 0.02 0.03 IDD(A) 0.04 0.05 VPS=18V 0.1 IDD(A) 0 0.01 0.02 0.03 0.04 0.05 The main heat sources of the circuit during operation are the voltage regulator and the relay coil drivers. Depending of the power supply voltage VPS, the ambient temperature TAMB, and the thermal of resistance of the package Rth(j-a), the sum of all the coil driver currents ΣIM is linked to the output regulator current IDD. In order to avoid spurious thermal shutdown of the system, it is advised to respect this relationship as shown on figures 7 and 8. ■ EXTENSION OF THE REGULATOR CURRENT CAPABILITY The output current capability of the STCC05 voltage regulator can be increased in a cost effective manner by adding an external ballast transistor and two biasing resistors. With such a circuit, the output voltage regulation remains at 5V 5%, and the current limitation is still active. Such a topology generates also power losses in the external power transistor especially when the supply voltage VPS is high or the regulator is in current limiting mode. Therefore it is advised to use a package with a suitable thermal resistance (Rth j-a). An example is proposed in the following figure doubling the regulator current capability of the solution to 100mA while producing a current limitation typically at 110mA. Figure 13: Circuit diagram to extend the STCC05 regulator current to 100mA Figure 14: Application diagram of the buzzer drive VPS VPS RE Q1 27Ω ½W BD136 ROH = 1kΩ BZ 2 10 kΩ RS= 560 Ω ENBZ RB 20 Ω ¼W STCC05 5V-50mA Regulator RBZ= 1kΩ VDD CS= 47 µF VIN INBZ BZ 1 ■ FLOATING BUZZER OPERATION The sound produced by the buzzer is controlled by the frequency of the square signal applied to the INBZ input pin. The external RS CS network connected to the BZ2 output pin produces a soft sound by smoothing the buzzer supplying envelope at power up and power down. Contrary to basic drivers, which directly apply 9/13 STCC05-B the voltage to the buzzer, this circuit feeds the buzzer with the exponential voltage induced by the charge and the discharge of the RS CS network. The ROH and RS resistors contribute to reduce high harmonic sound distortions. Indeed, they limit the peak current through the buzzer, feed the buzzer with the CS capacitor voltage, and limit the current through the low side NPN transistor of the driver. Therefore to set rising/falling durations of the sound shape, it is advised to adjust only the value of the CS capacitor. The integrated RBZ resistor is selected to discharge the buzzer when the low side transistor is off, especially at the maximum operating frequency. The buzzer is completely discharged within five times the time constant of the resistor-buzzer with τ = RBZ x CBUZZER. Therefore, RBZ < 1 / (10 x FMAX x CBUZZER). Since the buzzer capacitance CBUZZER is about 20nF at the maximum operating frequency of driver is 5kHz, this RBZ resistance is set at 1kΩ. Figure 15: Buzzer terminal voltages VBZ1 & VBZ2 and buzzer current IBZ Figure 16: Buzzer terminal voltage VBZ2 with buzzer enable and input circuit signals VBZ2 VBZ1 INBZ VBZ2 IBZ ENBZ Time : 100µs/div , VBZ1 & VBZ2 : 4V/div , IBZ : 20mA/div Time : 100ms/div , VBZ2 , ENBZ & INBZ : 5V/div ZERO CROSSING DETECTION CIRCUITS The detection of the zero crossing of the AC line voltage can be achieved at least on two ways with the STCC05, depending of the power supply unit. When the power supply uses a magnetic 50/60Hz transformer, the input pin SYN is connected to a transformer output through a resistor RZV, the electrical path being closed by the low side bridge diodes. ■ Figure 17: ZVS circuit operation using the AC secondary of a transformer VTF VAC VSYN VZVS VDD 20µs FILTER 15 kΩ AC LINE RZV 25 kW S1 Q ZVS S2 VSYN VTF 10/13 SYN 100 kΩ COM VZVS The delay between the real Zero Crossing event and the falling edge of ZVS depends on the internal filtering time, the resistance RZV, the rectifier drop voltage VF, the VPS supply load and the temperature. The STCC05 contribution to this delay can be evaluated by measuring the delay between its input voltage VTF and its output voltage VZVS. When using VF = 0.8V, RZV = 15kΩ, VPS = 15V, ICC = 20mA, it is about 50 µs on rising voltage VTF and 115 µs on falling voltage VTF. When the power supply uses a switch mode power supply, the input pin SYN is synchronized by an opto-coupler, which is connected to the mains terminals through high resistances. The isolator output is on all the time except during the zero crossing where no more current feeds the input and the output transistor switches off. STCC05-B Finally, the opto-coupler could be connected directly in high side mode between the SYN and the VDD pins: the ZVS signal is then made of high level pulses synchronized with the zero crossing. However, the coupler could be connected in low side mode with an external 10k pull-up resistor to VDD: the ZVS is now inverted with low level pulses. Figure 18: ZVS circuit operation with an opto-coupler V AC V AC IOPTO IOPTO VSYN VSYN VZVS VZVS V DD V DD V DD V DD RUP 20µs FILTER 20µs FILTER VAC SYN 25 kΩ 10 kΩ ZVS S1 SYN 25 kΩ V SYN 100 kΩ ZVS S1 Q Q S2 S2 VAC V SYN V ZVS 100 kΩ V ZVS COM COM Figure 19: Ordering Information Scheme STCC X - B Z Circuit configuration and related application 05 = Air conditioner control Typical power supply voltage B = 12V Package D4 = DIP-20 11/13 STCC05-B Figure 20: DIP-20 Package Mechanical Data DIMENSIONS REF. I a1 L B b b1 e F e3 Z Millimetres Min. Typ. Max. Min. a1 0.508 0.020 B 1.39 1.65 0.055 E 20 11 1 10 Typ. Max. 0.065 b 0.45 0.018 b1 0.25 0.010 D D Inches 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.279 I 3.93 0.155 L 3.3 Z 0.130 1.34 0.053 Table 6: Ordering Information Part Number Marking Package Weight Base qty STCC05-BD4 STCC05-B DIP-20 1.4 g 20 Table 7: Revision History 12/13 Date Revision 05-Oct-2004 1 Description of Changes First issue Delivery mode Tube STCC05-B Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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