INTEGRATED CIRCUITS DATA SHEET PCF1174C 4-digit static LCD car clock Product specification Supersedes data of September 1993 File under Integrated Circuits, IC16 1997 Apr 16 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C FEATURES GENERAL DESCRIPTION • Internal voltage regulator is electrically programmable for various LCD voltages The PCF1174C is a single chip, 4.19 MHz CMOS car clock circuit providing hours, minutes and seconds functions. It is designed to drive a 4-digit static liquid crystal display (LCD). • Time calibration is electrically programmable (no trimming capacitor required) • LCD voltage adjusts with temperature for good contrast Two external single-pole, single-throw switches will accomplish all time setting functions. Time calibration and voltage regulator are electrically programmable via an on-chip EEPROM. The circuit is battery-operated via an internal voltage regulator and an external resistor. • 4.19 MHz oscillator • 12-hour or 24-hour mode • Operating ambient temperature: −40 to +85 °C • 40-lead plastic SMD, face down (VSO40). ORDERING INFORMATION TYPE NUMBER PACKAGE NAME PCF1174CT VSO40 PCF1174CU − DESCRIPTION plastic very small outline package; 40 leads; face uncased chip in VERSION down(1) Notes 1. See Fig.1 and Chapter “Package outline” for pin layout and package details. 2. See Chapter “Chip dimensions and bonding pad locations” for pad layout and package details. 1997 Apr 16 SOT158-2 − tray(2) 2 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C PINNING SYMBOL PIN DESCRIPTION BP 1 backplane output PM 2 segment driver AM 3 segment driver ADEG1 4 segment driver C1 5 segment driver E2 6 segment driver D2 7 segment driver C2 8 segment driver E3 9 segment driver C3 10 E4 BP 1 40 B1 segment driver PM 2 39 G2 11 segment driver AM 3 38 F2 D4 12 segment driver ADEG1 4 37 A2 C4 13 segment driver C1 5 36 B2 B4 14 segment driver E2 6 35 COL S1 15 hour adjustment input DATA 16 EEPROM data input D2 7 34 G3 OSC IN 17 oscillator input C2 8 33 F3 OSC OUT 18 oscillator output E3 9 32 AD3 VSS 19 negative supply C3 10 MODE 20 12/24-hour mode select input E4 VPP 21 programming voltage input TS 22 test speed-up mode input ENABLE 23 set enable input for S1 and S2 VDD 24 positive supply voltage FLASH 25 colon option input SEL 26 EEPROM select input S2 27 minute adjustment input A4 28 segment driver F4 29 segment driver G4 30 segment driver B3 31 segment driver AD3 32 segment driver F3 33 segment driver G3 34 segment driver COL 35 segment driver B2 36 segment driver A2 37 segment driver F2 38 segment driver G2 39 segment driver B1 40 segment driver 1997 Apr 16 31 B3 PCF1174CT 11 30 G4 D4 12 29 F4 C4 13 28 A4 B4 14 27 S2 S1 15 26 SEL 25 FLASH DATA 16 24 VDD OSC IN 17 23 ENABLE OSC OUT 18 VSS 22 TS 19 MODE 20 21 VPP MSA991 Fig.1 Pin configuration, PCF1174CT, (VSO40). 3 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C FUNCTIONAL DESCRIPTION AND TESTING The average voltages across the segments are: Outputs 1. VON(RMS) = VDD 2. VOFF(RMS) = 0 V. The circuit outputs static data to the LCD. Generation of BP and the output signals are shown in Fig.4. A2 A1 AM PM B1 F2 B2 G2 G1 C1 E2 E1 A3 C2 P1 (P3) P2 (P4) F3 B3 F4 G3 E3 B4 G4 C3 E4 D2 D1 A4 D3 C4 D4 MSA992 Fig.2 Segment designation of LCD. TIME PM VDD BP MSA993 (a) 0 a. 12-hour mode. SEGMENT VDD OFF 0 VDD ON TIME 0 MSA994 15.625 ms MSA996 (b) b. 24-hour mode. Fig.3 Typical displays. 1997 Apr 16 Fig.4 Backplane and output signals. 4 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C LCD voltage (see Fig.5) The adjustable voltage regulator controls the supply voltage (see Section “LCD voltage programming”) in relation to temperature for good contrast, for example when VDD = 4.5 V at +25 °C, then: VDD = 3 to 4 V at +85 °C. VDD = 5 to 6 V at −40 °C. MSA995 −8 V SS (V) −6 (3) (2) −4 (1) −2 0 40 0 40 80 T ( o C) 120 (1) Programmed to 4.0 V at 25 °C (value within the specified operating range). (2) Programmed to 4.5 V at 25 °C (value within the specified operating range). (3) Programmed to 5.0 V at 25 °C (value within the specified operating range). Fig.5 Regulated voltage as a function of temperature (typical). 1997 Apr 16 5 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C 12/24-hour mode Segment test/reset Operation in 12-hour or 24-hour mode is selected by connecting MODE to VDD or VSS respectively. When S1 and S2 are connected to VSS, all LCD segments are switched ON. Releasing switches S1 and S2 resets the display. No reset occurs when DATA is connected to VSS (overlapping S1 and S2). Power-on After connecting the supply, the start-up mode is: Test mode 1:00 AM; 12-hour mode. When TS is connected to VDD, the device is in normal operating mode. When connecting TS to VSS all counters (seconds, minutes and hours) are stopped, allowing quick testing of the display via S1 and S2 (debounce and auto-increment times are 64 times faster). TS has a pull-up resistor but for reasons of safety it should be connected to VDD. 0:00; 24-hour mode. Colon If FLASH is connected to VDD the colon pulses at 1 Hz. If FLASH is connected to VSS the colon is static. Time setting EEPROM Switch inputs S1 and S2 have a pull-up resistor to facilitate the use of single-pole, single-throw contacts. A debounce circuit is incorporated to protect against contact bounce and parasitic voltages. VPP has a pull-up resistor but for reasons of safety it should be connected to VDD. LCD voltage programming To enable LCD voltage programming, SEL is set to open-circuit and a level of VDD − 5 V is applied to VPP (see Fig.6). The first pulse (tE) applied to the DATA input clears the EEPROM to give the lowest voltage output. Further pulses (tL) will increment the output voltage by steps of typically 150 mV (Tamb = 25 °C). For programming, measure VDD − VSS and apply a store pulse (tW) when the required value is reached. If the maximum number of steps (n = 31) is reached and an additional pulse is applied the voltage will return to the lowest value. Set enable Inputs S1 and S2 are enabled by connecting ENABLE to VDD or disabled by connecting to VSS. Set hours When S1 is connected to VSS the hours displayed advances by one and after one second continues with one advance per second until S1 is released (auto-increment). Set minutes When S2 is connected to VSS the time displayed in minutes advances by one and after one second continues with one advance per second until S2 is released (auto-increment). In addition to minute correction, the seconds counter is reset to zero. 1997 Apr 16 Time calibration To compensate for the tolerance in the quartz crystal frequency which has been positively offset (nominal deviation +60 × 10−6) by capacitors at the oscillator input and output, a number (n) of 262144 Hz pulses are inhibited every second of operation. 6 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C The number (n) is stored in a non-volatile memory which is achieved by the following steps (see Fig.6): 1. Set SEL to VSS and a level of VDD − 5 V to VPP 2. The quartz-frequency deviation ∆f/f is measured and (n) is calculated (see Table 1) 3. A first pulse tE is applied to the DATA input clears the EEPROM to give the highest backplane frequency 4. The calculated pulses (n) are entered in (tH, tL). If the maximum backplane period is reached and an additional pulse is applied the period will return to the lowest value. 5. The backplane period is controlled and (when correct) fixed by applying the store pulse tW 6. Release SEL and VPP. Table 1 Time calibration (∆t = 3.81 µs; SEL at VSS) OSCILLATOR-FREQUENCY DEVIATION ∆f/f (× 10−6) NUMBER OF PULSES (n) BACKPLANE PERIOD (ms) 0 0 15.625 +3.8 1 15.629 1997 Apr 16 +7.6 2 15.633 +11.4 3 15.636 . . . . . . . . . +117.8 31 15.743 7 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C 50 µs V PP 50 µs VDD VDD 5V 50 µs clears cells incrementing counters store pulse VDD DATA VDD 5V tE tH tL tH tL n tH tW t E , t W = 4 to 6 ms t H = 1 µs t L = 1 to 1.5 µs 0V pulse generators V PP SEL VSS V DD DATA PCF1174C V SS OSC OUT OSC IN C ext 47 µF R MSA997 12 V 6.8 kΩ Fig.6 Programming diagram. 1997 Apr 16 8 50 µs Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VDD supply voltage with respect to VSS − 8 V IDD supply current VSS = 0 V; note 1 − 3 mA VI input voltage all pins except VPP and DATA −0.3 VDD + 0.3 V pins VPP and DATA −3 VDD + 0.3 V Tamb operating ambient temperature −40 +85 °C Tstg storage temperature −55 +125 °C Note 1. Connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 mA by the external resistor. HANDLING Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in “Data Handbook IC16, General, Handling MOS Devices”. 1997 Apr 16 9 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C CHARACTERISTICS VDD = 3 to 6 V; VSS = 0 V; Tamb = −40 to +85 °C; crystal: f = 4.194304 MHz; Rs = 50 Ω; CL = 12 pF; maximum frequency tolerance = ±30 × 10−6; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VDD supply voltage voltage regulator programmed to 4.5 V at Tamb = 25 °C 3 − 6 V ∆VDD supply voltage variation S1 or S2 closed − − 50 mV TC supply voltage variation due to temperature − −0.35 − %/K VDD = 4.5 V − −16 − mV/K IDD supply current note 1 700 950 − µA CEXT capacitance external capacitor 47 − − µF ms Oscillator tosc start time − − 200 ∆f/f frequency deviation nominal n = 0 0 60 × 10−6 110 × 10−6 ∆f/f frequency stability ∆VDD = 100 mV − − 1 × 10−6 Rfb feedback resistance 300 1000 3000 kΩ Ci input capacitance − 16 − pF Co output capacitance − 27 − pF Inputs RO pull-up resistance S1, S2, TS, SEL and DATA 45 90 180 kΩ IIL leakage current FLASH, ENABLE, MODE − − 2 µA td debounce time S1 and S2 only 30 65 100 ms VPP = VDD − 5 V 70 − 700 µA during programming − 500 − µA output resistance ±100 µA − − 3 kΩ output resistance ±100 µA − − 5 kΩ DC offset voltage 200 kΩ/1 nF − − 50 mV VPP programming voltage output current IO2 Backplane (high and low levels) RBP Segment RSEG LCD Voffset(DC) Note 1. A suitable resistor (R) must be selected (example): a) VDD = 5 V; R max. (12 V − 5 V)/700 µA = 10 kΩ. b) VDD = 5 V; R typ. (12 V − 5 V)/900 µA = 7.8 kΩ (more reserve). c) IDD must not exceed 3 mA. 1997 Apr 16 10 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C CHIP DIMENSIONS AND BONDING PAD LOCATIONS F2 A2 G2 B1 BP PM AM ADEG1 y C1 B2 E2 COL D2 G3 C2 F3 E3 AD3 C3 B3 PCF1174CU 3.02 mm E4 G4 D4 F4 C4 A4 B4 S2 S1 SEL 0 DATA FLASH 0 2.12 mm VDD ENABLE TS VPP MODE VSS OSC OUT OSC IN x MSA998 Chip area: 6.4 mm2. Bonding pad dimensions: 110 µm × 110 µm. Chip thickness: 381 ±25 mm. Fig.7 Bonding pad locations, PCF1174CU; 40 terminals. 1997 Apr 16 11 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C Table 2 Bonding pad locations (dimensions in µm) All x/y coordinates are referenced to the bottom left pad (OSC IN), see Fig.7. PAD x y PAD x y BP 600 2676 VPP 800 0 PM 400 2676 TS 1000 0 AM 200 2676 ENABLE 1200 0 0 2676 VDD 1400 0 C1 −138 2448 FLASH 1538 168 E2 −138 2228 SEL 1538 388 D2 −138 2008 S2 1538 608 C2 −138 1808 A4 1538 808 E3 −138 1608 F4 1538 1008 C3 −138 1408 G4 1538 1208 E4 −138 1208 B3 1538 1408 D4 −138 1008 AD3 1538 1608 C4 −138 808 F3 1538 1808 B4 −138 608 G3 1538 2008 S1 −138 388 COL 1538 2208 DATA −138 168 B2 1538 2448 ADEG1 OSC IN 0 0 A2 1400 2676 OSC OUT 200 0 F2 1200 2676 VSS 400 0 G2 1000 2676 B1 800 2676 MODE 600 0 chip corner (max. value) −360 −170 1997 Apr 16 12 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C APPLICATION INFORMATION BP 2 - 14 1 segment drivers to LCD DECODER 28 - 40 PCF1174C DECODER AM/PM COUNTER OSC IN 17 OSC OUT 18 SEL 26 DATA 16 S1 HOURS COUNTER MINUTES COUNTER SECONDS COUNTER ADJUSTABLE DIVIDER OSCILLATOR 6.8 kΩ EEPROM 15 S2 27 MODE 20 V SS 19 12 V CONTROL LOGIC I DD 21 V PP 25 FLASH 22 TS 23 ENABLE VOLTAGE REGULATOR VDD (1) C ext 100 nF MSA999 (1) To be placed close to the IC. Fig.8 Typical application diagram. 1997 Apr 16 13 47 µF Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C PACKAGE OUTLINE VSO40: plastic very small outline package; 40 leads; face down SOT158-2 D E A y X c HE v M A Z 40 21 L Lp θ A1 Q (A 3) A2 A pin 1 index detail X 1 20 w M bp e 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (2) e HE L Lp Q v w y Z (1) mm 2.70 0.3 0.1 2.45 2.25 0.25 0.42 0.30 0.22 0.14 15.6 15.2 7.6 7.5 0.762 12.3 11.8 2.25 1.7 1.5 1.15 1.05 0.2 0.1 0.1 0.6 0.3 0.012 0.096 0.017 0.0087 0.61 0.010 0.004 0.089 0.012 0.0055 0.60 0.30 0.29 0.03 0.48 0.46 0.067 0.089 0.059 inches 0.11 0.045 0.024 0.008 0.004 0.004 0.041 0.012 θ 7o 0o Note 1. Plastic or metal protrusions of 0.4 mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC JEDEC EIAJ ISSUE DATE 92-11-17 95-01-24 SOT158-2 1997 Apr 16 EUROPEAN PROJECTION 14 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all VSO packages if the following conditions are observed: 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. • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. • The longitudinal axis of the package footprint must be parallel to the solder flow. • The package footprint must incorporate solder thieves at the downstream end. 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 VSO 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. 1997 Apr 16 15 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C 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 Apr 16 16 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES 1997 Apr 16 17 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES 1997 Apr 16 18 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES 1997 Apr 16 19 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. 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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 417087/1200/02/pp20 Date of release: 1997 Apr 16 Document order number: 9397 750 01528