INTEGRATED CIRCUITS DATA SHEET PCF1178C 4-digit duplex LCD car clock Product specification Supersedes data of September 1993 File under Integrated Circuits, IC16 1997 Apr 16 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C FEATURES GENERAL DESCRIPTION • Internal voltage regulator is electrically programmable for various LCD voltages The PCF1178C 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 duplex 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 • 28-lead plastic SMD (SO28) • 1 Hz set mode. ORDERING INFORMATION PACKAGE TYPE NUMBER NAME DESCRIPTION plastic small outline package; 28 leads; body width 7.5 mm(1) PCF1178CT SO28 PCF1178CU − PCF1178CU/10 − chip-on-film frame carrier PCF1178CU/5 − wafer(2) uncased chip in unsawn SOT136-1 − tray(2) (FFC)(2) − − 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 VERSION 2 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C PINNING SYMBOL PIN DESCRIPTION BP1 1 backplane 1 BP2 2 backplane 2 AM/PM 3 segment driver A2/ADEG1 4 segment driver B1/C1 5 segment driver F2/E2 6 segment driver G2/D2 7 segment driver B2/C2 8 A4/COL F3/E3 BP1 1 28 S1 BP2 2 27 DATA segment driver AM/PM 3 26 OSC IN 9 segment driver A2/ADEG1 4 25 OSC OUT 10 segment driver B1/C1 5 24 V SS 23 MODE 22 V PP G3/AD3 11 segment driver F2/E2 6 B3/C3 12 segment driver G2/D2 7 F4/E4 13 segment driver G4/D4 14 segment driver B4/C4 15 segment driver S2 16 minute adjustment input SEL 17 EEPROM select input FLASH 18 VDD PCF1178CT B2/C2 8 21 TS A4/COL 9 20 ENABLE F3/E3 10 19 V DD G3/AD3 11 18 FLASH colon option input B3/C3 12 17 SEL 19 positive supply voltage F4/E4 13 16 S2 ENABLE 20 enable input (for S1 and S2) G4/D4 14 15 B4/C4 TS 21 test speed-up mode input VPP 22 programming voltage input MODE 23 12/24-hour mode select input VSS 24 negative supply voltage OSC OUT 25 oscillator output OSC IN 26 oscillator input MSB229 DATA 27 EEPROM data input S1 28 hour adjustment input 1997 Apr 16 Fig.1 Pin configuration, PCF1178CT, (SO28). 3 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C FUNCTIONAL DESCRIPTION AND TESTING The average voltages across the segments are: Outputs 1. VON(RMS) = 0.79 VDD 2. VOFF(RMS) = 0.35 VDD. The circuit outputs 1 : 2 multiplexed data (duplex) to the LCD. Generation of BP1 and BP2 (three-level backplane signals) and the output signals are shown in Fig.4. A2 A1 AM PM B1 F2 A3 F3 B2 B3 F4 G2 G1 A4 G3 B4 G4 COL C1 E2 E1 C2 E3 C3 E4 D2 D1 D3 C4 D4 MLB251 Fig.2 Segment designation of LCD. BP1 VDD VDD /2 0 TIME BP2 PM VDD VDD /2 0 MSA993 (a) a. 12-hour mode. SEGMENT 1 SEGMENT 2 ON ON VDD 0 VDD OFF ON 0 VDD TIME ON OFF 0 MSA994 (b) VDD OFF OFF 0 b. 24-hour mode. MSB226 Fig.3 Typical displays. 1997 Apr 16 15.625 ms Fig.4 Backplane and output signals. 4 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C 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 duplex LCD car clock PCF1178C 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. If MODE is left open-circuit and a reset occurs, the mode will change from 12-hour to 24-hour mode or vice versa. 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 Test mode After connecting the supply, the start-up mode is: 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. MODE connected to VDD: 12-hour mode, 1:00 AM. MODE connected to VSS: 24-hour mode, 0:00. MODE left open-circuit: 24-hour mode, 0:00 or 1:00. Colon EEPROM If FLASH is connected to VDD the colon pulses at 0.5 Hz. If FLASH is connected to VSS the colon is static. VPP has a pull-up resistor but for reasons of safety it should be connected to VDD. Time setting 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. 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). 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. Set minutes When S2 is connected to VSS the time displayed in minutes advances by one and after one second continues with two advances per second until S2 is released (auto-increment). In addition to minute correction, the seconds counter is reset to zero. 1997 Apr 16 6 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C 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 = 7.63 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 15.633 1997 Apr 16 +7.6 2 15.641 +11.4 3 15.648 . . . . . . . . . +117.8 31 15.861 7 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C 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 PCF1178C V SS OSC OUT OSC IN C ext 47 µF R MSB230 12 V 6.8 kΩ Fig.6 Programming diagram. 1997 Apr 16 8 50 µs Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C 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 an 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 duplex LCD car clock PCF1178C 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 supply voltage voltage regulator programmed to 4.5 V at Tamb = 25 °C ∆VDD supply voltage variation S1 or S2 closed TC supply voltage variation due to temperature VDD 3 − 6 V − − 50 mV − −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 RO pull-up/pull-down resistance MODE 100 300 1000 kΩ IIL leakage current ENABLE, FLASH − − 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 duplex LCD car clock PCF1178C B1/C1 F2/E2 B2/C2 G2/D2 F3/E3 y A4/COL CHIP DIMENSIONS AND BONDING PAD LOCATIONS A2/ADEG1 G3/AD3 B3/C3 AM/PM F4/E4 BP2 G4/D4 BP1 PCF1178CU 2.92 mm B4/C4 S1 DATA S2 SEL OSC IN FLASH OSC OUT 0 0 1.92 mm VSS MODE VPP TS ENABLE VDD x MSB228 Chip area: 5.61 mm2. Bonding pad dimensions: 110 µm × 110 µm. Chip thickness: 381 ±25 µm. Fig.7 Bonding pad locations, PCF1178CU; 28 terminals. 1997 Apr 16 11 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C Table 2 Bonding pad locations (dimensions in µm) All x/y coordinates are referenced to the bottom left pad (VDD), see Fig.7. PAD S1 x y 1490 881 PAD x y G4/D4 −86 1588 DATA 1490 639 F4/E4 −86 1808 OSC IN 1490 408 B3/C3 −86 2028 OSC OUT 1490 188 G3/AD3 −86 2248 VSS 1352 0 F3/E3 −48 2476 MODE 969 0 A4/COL 352 2476 VPP 770 0 B2/C2 552 2476 TS 506 0 G2/D2 752 2476 ENABLE 306 0 F2/E2 952 2476 0 0 B1/C1 1352 2476 FLASH −86 188 A2/ADEG1 1490 2248 SEL −86 408 AM/PM 1490 2028 S2 −86 628 BP2 1490 1808 B4/C4 −86 848 BP1 1490 1588 chip corner (max. value) −305 −175 VDD 1997 Apr 16 12 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C APPLICATION INFORMATION BP1 1 3 segment drivers to LCD DECODER BP2 2 15 PCF1178C DECODER AM/PM COUNTER OSC IN 26 OSC OUT 25 SEL 17 DATA 27 S1 HOURS COUNTER MINUTES COUNTER SECONDS COUNTER ADJUSTABLE DIVIDER OSCILLATOR 6.8 kΩ EEPROM 28 S2 16 MODE 23 V SS 24 12 V CONTROL LOGIC VOLTAGE REGULATOR I DD 22 V PP 18 FLASH 21 TS 20 ENABLE 19 VDD (1) C ext 100 nF MSB227 (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 duplex LCD car clock PCF1178C PACKAGE OUTLINE SO28: plastic small outline package; 28 leads; body width 7.5 mm SOT136-1 D E A X c y HE v M A Z 15 28 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 14 e bp 0 detail X w M 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 (1) e HE L Lp Q v w y mm 2.65 0.30 0.10 2.45 2.25 0.25 0.49 0.36 0.32 0.23 18.1 17.7 7.6 7.4 1.27 10.65 10.00 1.4 1.1 0.4 1.1 1.0 0.25 0.25 0.1 0.9 0.4 0.012 0.096 0.004 0.089 0.01 0.019 0.013 0.014 0.009 0.71 0.69 0.30 0.29 0.050 0.42 0.39 0.055 0.043 0.016 0.043 0.039 0.01 0.01 0.004 0.035 0.016 inches 0.10 Z (1) θ Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT136-1 075E06 MS-013AE 1997 Apr 16 EIAJ EUROPEAN PROJECTION ISSUE DATE 91-08-13 95-01-24 14 o 8 0o Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all SO 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 SO 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 duplex LCD car clock PCF1178C 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 duplex LCD car clock PCF1178C NOTES 1997 Apr 16 17 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C NOTES 1997 Apr 16 18 Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1178C 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 01531