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INTEGRATED CIRCUITS
DATA SHEET
PCF1172C 31/2-digit LCD car clock
Product specification Supersedes data of September 1993 File under Integrated Circuits, IC16 1997 Apr 16
Philips Semiconductors
Product specification
31/2-digit LCD car clock
FEATURES * Driving standard indicators 31
2-digit
PCF1172C
GENERAL DESCRIPTION
LCD with AM and PM
* Internal voltage regulator for 5 V LCD * Option for external stabilized voltage supply * 4.19 MHz oscillator * Integrated oscillator output capacitor and polarization resistor * Operating ambient temperature: -40 to +85 C * 40-lead plastic SMD, face down (VSO40). ORDERING INFORMATION TYPE NUMBER PCF1172CT PCF1172CU Notes
The PCF1172C is a single chip, 4.19 MHz CMOS clock circuit indicating hours and minutes. It is designed to drive a 312-digit liquid crystal display (LCD) with AM and PM indicators. Two external single-pole, single-throw switches will accomplish all time setting functions. The circuit is battery-operated via an internal 5 V voltage regulator or by an external stabilized voltage supply.
PACKAGE NAME VSO40 - uncased chip in tray(2) DESCRIPTION plastic very small outline package; 40 leads; face down(1) VERSION SOT158-2 -
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.
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
PINNING SYMBOL OSC OUT OSC IN S1 S3 BP PM AM E2 D2 C2 E3 D3 C3 E4 D4 C4 B4 S2 S4 VSS S6 n.c. VDD A4 F4 G4 B3 A3 F3 G3 P1, P2 P3, P4 B2 A2 F2 G2 B1, C1 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 29 30 31 32 33 34 35 36 37 DESCRIPTION oscillator output oscillator input set hour 2 minute correction 64 Hz backplane driver (common of LCD) segment output for PM annunciator segment output for AM annunciator segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver segment driver set minutes internal voltage regulation negative supply selectable correction mode not connected positive supply segment driver segment driver segment driver segment driver segment driver segment driver segment driver colon flashing colon static segment driver segment driver segment driver segment driver segment driver
C4 16 B4 17 S2 18 S4 19 V SS 20
MSA986
PCF1172C
SYMBOL TR TS (VDD)
PIN 38 39 40
DESCRIPTION test reset; connect to (VDD) test speed-up; connect to (VDD) positive supply for test and oscillator inputs
OSC OUT OSC IN S1 S3 BP PM AM E2 D2
1 2 3 4 5 6 7 8 9
40 (V DD ) 39 TS 38 TR 37 B1, C1 36 G2 35 F2 34 A2 33 B2 32 P3, P4 31 P1, P2
C2 10
PCF1172CT
E3 11 30 G3 29 F3 28 A3 27 B3 26 G4 25 F4 24 A4 23 VDD D3 12 C3 13 E4 14 D4 15
22 n.c. 21 S6
Fig.1 Pin configuration, PCF1172CT, (VSO40).
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
PCF1172C
A2
A3
A4
AM PM
B1 F2 G2
B2
P1 (P3)
F3 G3
B3 F4 G4
B4
C1 E2
C2
P2 (P4)
E3
C3 E4
C4
D2
D3
D4
MSA989
Fig.2 Segment designation of LCD.
TIME
AM
MSA990
Fig.3 Display mode (12-hour with AM/PM annunciator).
OPERATIONAL INPUTS Operational inputs S1, S2 and S3 have an internal pull-up resistor to facilitate use of external single-pole, single-throw switches. A specific debounce circuit is integrated as protection against contact debounce and parasitic voltages. In the description below, an arrangement as shown in Fig.5 is assumed and S1, S2 and S3 refer to the external switches rather than the corresponding inputs. Set hours, switch S1 Closure of S1 increments the hours according to the correction mode selected by S6 (see Chapter "Input options").
Set minutes/reset seconds, switch S2 When S2 is closed, the minute setting is corrected according to the correction mode determined by S6 (see Chapter "Input options"). The seconds counter is reset to zero each time S2 is closed, and begins running each time S2 is opened. Segment test/reset, switches S1 and S2 If S1 and S2 are closed simultaneously all LCD segments are switched on. When the switches are released, the clock starts at 1 : 00.
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
Time correction 2 minutes, switch S3 .This switch operates in two ranges: * Displayed time 58 minutes 00 seconds * Displayed time 1 minute 59 seconds. When switch S3 is pressed in these ranges, the minutes and seconds are reset to zero. For displayed time 58 minutes 00 seconds, the hour is also incremented by one. INPUT OPTIONS In the description below S4 and S6 refer to the external switches shown in Fig.5 rather than to the corresponding inputs. In a real application, these inputs will normally be bonded to the appropriate level to give the required function mode. Internal/external regulation, switch S4 For internal regulation, S4 is closed, the internal voltage regulator is active and the voltage supply for the LCD is regulated to 5 V. For external regulation, S4 is open and the circuit has to be supplied with an externally regulated voltage.
PCF1172C
Single/continuous correction mode, switch S6 For single-set correction mode, S6 is connected to VDD. Each closure of S1 or S2 advances the counter by one. For continuous-set correction mode, S6 is connected to VSS. Momentary closure of S1 or S2 causes single increments as for single-set correction mode. If S1 or S2 is kept closed for more than 1s, the counter is automatically incremented by 1 for each full second that S1 or S2 is kept closed. TESTING In normal operation the test inputs TR (pin 38) and TS (pin 39) have to be connected to VDD (pin 23). A test frequency (64 Hz) is available at BP (pin 5). The test mode is activated by connecting TS to VSS (pin 20). All output frequencies are then increased by a factor of 65536. In this mode the maximum input frequency is 100 kHz (external generator at OSC IN). By connecting TR to VSS all counters (seconds, minutes and hours) are stopped. After connecting TR to VDD all counters start from an initial state. The switches/inputs described above also operate in the test mode.
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VDD VI Tamb Tstg 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". PARAMETER supply voltage with respect to VSS with internal regulation disconnected all input voltages operating ambient temperature storage temperature CONDITIONS note 1 - MIN. 8 MAX. V UNIT
VSS - 0.3 VDD + 0.3 V -40 -55 +85 +125 C C
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
PCF1172C
CHARACTERISTICS VDD = 5 V; VSS = 0 V; Tamb = -40 to +85 C; crystal: f = 4.194304 MHz; Rs = 50 ; CL = 12 pF; unless otherwise specified. SYMBOL Supply VDD supply voltage external regulation internal regulation IREG IDD regulation current with internal regulation current consumption IREG = 1 mA external regulation 3 3 4 0.2 all switches open; without LCD; 50 internal regulation disconnected; note 1 - - VDD = 100 mV - 0.1 - 19 - - 5 - 400 6 6 6 5 700 V V V mA A PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
ro tosc f/fosc Rfb Ci Co Ii td RS RBP fBP Voffset(DC) Notes
differential internal impedance IREG = 1 mA start time frequency stability feedback resistance input capacitance output capacitance
- - 0.2 x - - 24 10-6
150
Oscillator (pins 1 and 2; note 2) 200 1x 1 9 29 10-6 M pF pF A ms k k Hz mV ms
Switches S1, S2 and S3 (pins 18, 3 and 4) input current debounce time segment driver output resistance backplane driver output resistance backplane driver output frequency LCD DC offset voltage RL = 200 k; CL = 1 nF IL = 50 A IL = 250 A with inputs connected to VSS 50 32 - - - - 150 - 1 0.2 64 - 500 150 2.5 0.5 - 50
1. The current IEXT = IREG + IDD + 2 x Ii (+ LCD current). 2. For correct operation of the oscillator: VDD 3 V.
1997 Apr 16
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
CHIP DIMENSIONS AND BONDING PAD LOCATIONS
PCF1172C
y V DD n.c. VSS S6 S4 A4 S2 B4
F4 G4 B3 A3 F3 G3 2.66 mm P1, P2 P3, P4 B2 A2 F2 G2 0 0
C4 D4 E4 C3 D3 E3
PCF1172CU
C2 D2 E2 AM PM x V DD OSC IN S1 S3 B1, C1 OSC OUT TR TS BP
MSA988
2.36 mm
n.c. = not connected. Chip area: 6.28 mm2. Bonding pad dimensions: 110 m x 110 m. Chip thickness: 381 25 m.
Fig.4 Bonding pad locations, PCF1172CU; 40 terminals.
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
Table 1 Bonding pad locations (dimensions in m) All x/y coordinates are referenced to the pad G2, see Fig.4. PAD OSC OUT OSC IN S1 S3 BP PM AM E2 D2 C2 E3 D3 C3 E4 D4 C4 B4 S2 S4 VSS chip corner (max. value) x 1060 1260 1460 1680 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1920 1680 1460 1260 1060 -220 y 0 0 0 0 0 240 460 660 860 1060 1260 1460 1660 1860 2080 2320 2320 2320 2320 2320 -170 S6 n.c. VDD A4 F4 G4 B3 A3 F3 G3 P1, P2 P3, P4 B2 A2 F2 G2 B1, C1 TR TS VDD PAD x 860 660 460 240 0 0 0 0 0 0 0 0 0 0 0 0 240 460 660 860
PCF1172C
y 2320 2320 2320 2320 2320 2080 1860 1660 1460 1260 1060 860 660 460 240 0 0 0 0 0
1997 Apr 16
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
APPLICATION INFORMATION
PCF1172C
R = 4.7 k to 8.2 k battery I EXT C T = 5 pF to 25 pF 4.19 MHz
VDD S6 selectable correction mode VDD VSS S6 21 23
TR 38 39
TS
(VDD ) 40 2
OSC IN 1
OSC OUT
I REG
I DD
2 Ii 33 F to 100 F segment drivers to LCD (1)
S3 S3 2 minutes correction S2 set minutes S1 set hour S2 18 S1 3 4
SHUNT VOLTAGE REGULATOR
PCF1172C
19 S4 internal voltage regulation
20 VSS
S4
MSA987
(1) Only required if internal regulation is disconnected. From pin 2 (OSC IN) to any other pin the stray capacitance should not exceed 2 pF.
Fig.5 Typical application diagram.
1997 Apr 16
9
Philips Semiconductors
Product specification
31/2-digit LCD car clock
PACKAGE OUTLINE VSO40: plastic very small outline package; 40 leads; face down
PCF1172C
SOT158-2
D y c
E
A X
HE Z 40 21 L Lp (A 3)
vM A
A1 Q A2
A
pin 1 index detail X
1 e bp
20 wM
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 2.70 0.11 A1 0.3 0.1 A2 2.45 2.25 A3 0.25 bp 0.42 0.30 c 0.22 0.14 D (1) 15.6 15.2 E (2) 7.6 7.5 0.30 0.29 e 0.762 0.03 HE 12.3 11.8 0.48 0.46 L 2.25 Lp 1.7 1.5 Q 1.15 1.05 v 0.2 w 0.1 y 0.1 Z (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
0.067 0.089 0.059
0.045 0.024 0.008 0.004 0.004 0.041 0.012
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 SOT158-2 REFERENCES IEC JEDEC EIAJ EUROPEAN PROJECTION
ISSUE DATE 92-11-17 95-01-24
1997 Apr 16
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Philips Semiconductors
Product specification
31/2-digit 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 VSO 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
PCF1172C
Wave soldering techniques can be used for all VSO 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
31/2-digit LCD car clock
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
PCF1172C
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.
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
NOTES
PCF1172C
1997 Apr 16
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
NOTES
PCF1172C
1997 Apr 16
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Philips Semiconductors
Product specification
31/2-digit LCD car clock
NOTES
PCF1172C
1997 Apr 16
15
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/pp16
Date of release: 1997 Apr 16
Document order number:
9397 750 01527

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