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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
FEATURES * Internal voltage regulator is electrically programmable for various LCD voltages * Time calibration is electrically programmable (no trimming capacitor required) * LCD voltage adjusts with temperature for good contrast * 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 PCF1178CT PCF1178CU PCF1178CU/10 PCF1178CU/5 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. SO28 - - - uncased chip in unsawn wafer(2) tray(2) (FFC)(2) DESCRIPTION plastic small outline package; 28 leads; body width 7.5 mm(1) chip-on-film frame carrier GENERAL DESCRIPTION
PCF1178C
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). 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.
VERSION SOT136-1 - - -
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
PINNING SYMBOL BP1 BP2 AM/PM A2/ADEG1 B1/C1 F2/E2 G2/D2 B2/C2 A4/COL F3/E3 G3/AD3 B3/C3 F4/E4 G4/D4 B4/C4 S2 SEL FLASH VDD ENABLE TS VPP MODE VSS OSC OUT OSC IN DATA S1 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 DESCRIPTION backplane 1 backplane 2 segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver minute adjustment input EEPROM select input colon option input positive supply voltage enable input (for S1 and S2) test speed-up mode input
MSB229
PCF1178C
BP1 BP2 AM/PM A2/ADEG1 B1/C1 F2/E2 G2/D2 B2/C2 A4/COL F3/E3 G3/AD3 B3/C3 F4/E4 G4/D4
1 2 3 4 5 6 7
28 27 26 25 24 23 22
S1 DATA OSC IN OSC OUT V SS MODE V PP TS ENABLE V DD FLASH SEL S2 B4/C4
PCF1178CT
8 9 10 11 12 13 14 21 20 19 18 17 16 15
programming voltage input 12/24-hour mode select input negative supply voltage oscillator output oscillator input EEPROM data input hour adjustment input Fig.1 Pin configuration, PCF1178CT, (SO28).
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
FUNCTIONAL DESCRIPTION AND TESTING Outputs 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.
PCF1178C
The average voltages across the segments are: 1. VON(RMS) = 0.79 VDD 2. VOFF(RMS) = 0.35 VDD.
A1
A2
A3
A4
AM PM
B1 F2 G1 G2
B2 COL
F3 G3
B3 F4 G4
B4
E1
C1 E2
C2
E3
C3 E4
C4
D1
D2
D3
D4
MLB251
Fig.2 Segment designation of LCD.
BP1
VDD VDD /2 0 VDD VDD /2 0
TIME
PM
MSA993
BP2
(a)
SEGMENT 1 ON
SEGMENT 2 ON
VDD 0 VDD
a. 12-hour mode.
OFF
ON 0
TIME ON
MSA994
VDD OFF 0 VDD OFF OFF 0
MSB226
(b)
b. 24-hour mode.
15.625 ms
Fig.3 Typical displays.
Fig.4 Backplane and output signals.
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
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.
PCF1178C
-8 V SS (V) -6 (3) (2) -4 (1)
MSA995
-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
12/24-hour mode 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. Power-on After connecting the supply, the start-up mode is: 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 If FLASH is connected to VDD the colon pulses at 0.5 Hz. If FLASH is connected to VSS the colon is static. 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. 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 two advances per second until S2 is released (auto-increment). In addition to minute correction, the seconds counter is reset to zero. Segment test/reset
PCF1178C
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). Test 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. EEPROM 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. Time calibration To compensate for the tolerance in the quartz crystal frequency which has been positively offset (nominal deviation +60 x 10-6) by capacitors at the oscillator input and output, a number (n) of 262144 Hz pulses are inhibited every second of operation.
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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 s; SEL at VSS) NUMBER OF PULSES (n) 0 1 2 3 . . . 31 BACKPLANE PERIOD (ms) 15.625 15.633 15.641 15.648 . . . 15.861
OSCILLATOR-FREQUENCY DEVIATION f/f (x 10-6) 0 +3.8 +7.6 +11.4 . . . +117.8
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
PCF1178C
50 s V PP VDD VDD 5V 50 s VDD VDD 5V tE t E , t W = 4 to 6 ms t H = 1 s t L = 1 to 1.5 s 0V pulse generators tH tL tH n tL tH clears cells incrementing counters
50 s
store pulse
50 s
DATA
tW
V PP
SEL V DD
VSS
DATA
PCF1178C
OSC OUT C ext 47 F
V SS
OSC IN
MSB230
R 12 V 6.8 k
Fig.6 Programming diagram.
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VDD IDD VI Tamb Tstg Note PARAMETER supply voltage supply current input voltage operating ambient temperature storage temperature CONDITIONS with respect to VSS VSS = 0 V; note 1 all pins except VPP and DATA pins VPP and DATA - - -0.3 -3 -40 -55 MIN. 8 3
PCF1178C
MAX. V
UNIT mA V V C C
VDD + 0.3 VDD + 0.3 +85 +125
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
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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 ; CL = 12 pF; maximum frequency tolerance = 30 x 10-6; unless otherwise specified. SYMBOL Supply VDD VDD TC IDD CEXT Oscillator tosc f/f f/f Rfb Ci Co Inputs RO RO IIL td pull-up resistance pull-up/pull-down resistance leakage current debounce time S1, S2, TS, SEL and DATA MODE ENABLE, FLASH S1 and S2 only VPP = VDD - 5 V during programming 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 A = 10 k. b) VDD = 5 V; R typ. (12 V - 5 V)/900 A = 7.8 k (more reserve). c) IDD must not exceed 3 mA. DC offset voltage 200 k/1 nF - - 50 mV output resistance 100 A - - 5 k output resistance 100 A - - 3 k 45 100 - 30 90 300 - 65 - 500 180 1000 2 100 k k A ms A A start time frequency deviation frequency stability feedback resistance input capacitance output capacitance nominal n = 0 VDD = 100 mV - 0 - 300 - - - 60 x 10-6 - 1000 16 27 200 110 x 10-6 1 x 10-6 3000 - - k pF pF ms supply voltage supply voltage variation supply voltage variation due to temperature supply current capacitance voltage regulator programmed to 4.5 V at Tamb = 25 C S1 or S2 closed VDD = 4.5 V note 1 external capacitor 3 - - - 700 47 - - -0.35 -16 950 - 6 50 - - - - V mV %/K mV/K A F PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VPP programming voltage IO2 output current 70 - 700 -
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
CHIP DIMENSIONS AND BONDING PAD LOCATIONS
PCF1178C
A4/COL
G2/D2
B2/C2
B1/C1
y F3/E3
F2/E2
G3/AD3 B3/C3 F4/E4 G4/D4 PCF1178CU B4/C4 S2 SEL FLASH 0 VDD ENABLE MODE VPP VSS TS 0
A2/ADEG1 AM/PM BP2 BP1
2.92 mm
S1 DATA OSC IN OSC OUT x
1.92 mm
MSB228
Chip area: 5.61 mm2. Bonding pad dimensions: 110 m x 110 m. Chip thickness: 381 25 m.
Fig.7 Bonding pad locations, PCF1178CU; 28 terminals.
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
Table 2 Bonding pad locations (dimensions in m) All x/y coordinates are referenced to the bottom left pad (VDD), see Fig.7. PAD S1 DATA OSC IN OSC OUT VSS MODE VPP TS ENABLE VDD FLASH SEL S2 B4/C4 chip corner (max. value) x 1490 1490 1490 1490 1352 969 770 506 306 0 -86 -86 -86 -86 -305 y 881 639 408 188 0 0 0 0 0 0 188 408 628 848 -175 F4/E4 B3/C3 G3/AD3 F3/E3 A4/COL B2/C2 G2/D2 F2/E2 B1/C1 A2/ADEG1 AM/PM BP2 BP1 PAD G4/D4 x -86 -86 -86 -86 -48 352 552 752 952 1352 1490 1490 1490 1490
PCF1178C
y 1588 1808 2028 2248 2476 2476 2476 2476 2476 2476 2248 2028 1808 1588
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
APPLICATION INFORMATION
PCF1178C
BP1 1 BP2 2 DECODER
3 15 DECODER
segment drivers to LCD
PCF1178C
AM/PM COUNTER OSC IN OSC OUT SEL DATA S1 S2 MODE 26 25 17 27 28 16 23
HOURS COUNTER
MINUTES COUNTER
SECONDS COUNTER
OSCILLATOR
ADJUSTABLE DIVIDER
12 V 6.8 k
EEPROM
22 18
V PP FLASH TS ENABLE
I DD
CONTROL LOGIC
21 20
V SS
24
VOLTAGE REGULATOR
19
VDD
(1)
C ext
100 nF
MSB227
47 F
(1) To be placed close to the IC.
Fig.8 Typical application diagram.
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
PACKAGE OUTLINE SO28: plastic small outline package; 28 leads; body width 7.5 mm
PCF1178C
SOT136-1
D
E
A X
c y HE vMA
Z 28 15
Q A2 A1 pin 1 index Lp L 1 e bp 14 wM detail X (A 3) A
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 2.65 0.10 A1 0.30 0.10 A2 2.45 2.25 A3 0.25 0.01 bp 0.49 0.36 c 0.32 0.23 D (1) 18.1 17.7 0.71 0.69 E (1) 7.6 7.4 0.30 0.29 e 1.27 0.050 HE 10.65 10.00 0.42 0.39 L 1.4 0.055 Lp 1.1 0.4 0.043 0.016 Q 1.1 1.0 0.043 0.039 v 0.25 0.01 w 0.25 0.01 y 0.1 0.004 Z
(1)
0.9 0.4 0.035 0.016
0.012 0.096 0.004 0.089
0.019 0.013 0.014 0.009
8 0o
o
Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. OUTLINE VERSION SOT136-1 REFERENCES IEC 075E06 JEDEC MS-013AE EIAJ EUROPEAN PROJECTION
ISSUE DATE 91-08-13 95-01-24
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
SOLDERING Introduction 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. 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). Reflow soldering Reflow soldering techniques are suitable for all SO packages. 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. 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. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 C. Wave soldering
PCF1178C
Wave soldering techniques can be used for all SO packages if the following conditions are observed: * 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. 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. 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. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. 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.
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
PCF1178C
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
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
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
NOTES
PCF1178C
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
NOTES
PCF1178C
1997 Apr 16
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Philips Semiconductors
Product specification
4-digit duplex LCD car clock
NOTES
PCF1178C
1997 Apr 16
19
Philips Semiconductors - a worldwide company
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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 (c) Philips Electronics N.V. 1997
Internet: http://www.semiconductors.philips.com
SCA54
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
417087/1200/02/pp20
Date of release: 1997 Apr 16
Document order number:
9397 750 01531

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