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PHILIPS PCF1174C 4-digit Static LCD Car Clock User Manual & Data Sheet

Summary

The PCF1174C is a high-precision CMOS chip designed specifically for automotive applications, serving as a reliable time clock driver for 4-digit static LCD displays. This portable and battery-operated circuit provides fully programmable hours, minutes, and seconds functions, featuring an internal voltage regulator that adjusts with temperature for optimal contrast. The manual provides comprehensive technical data, covering operational modes (12/24 hour), detailed pin configurations, and functional specifications necessary for electronics designers creating reliable car clock systems.

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查询PCF1174C供应商

INTEGRATED CIRCUITS

DATA SHEET

PCF1174C 4-digit static LCD car clock

Product specification Apr

Supersedes data of September File under Integrated Circuits, IC16

Page Summary Contents For PHILIPS PCF1174C 4-digit Static LCD Car Clock User Manual & Data Sheet

Page 1 查询PCF1174C供应商 INTEGRATED CIRCUITS DATA SHEET PCF1174C 4-digit static LCD car clock Product specification Apr Supersedes data of September File under Integrated Circuits, IC16
Page 2 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C FEATURES GENERAL DESCRIPTION Internal voltage regulator is electrically programmable The PCF1174C is a single chip, 4...
Page 3 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C PINNING SYMBOL PIN DESCRIPTION BP backplane output PM segment driver AM segment driver ADEG1 segment driver C1 segmen...
Page 4 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C FUNCTIONAL DESCRIPTION AND TESTING The average voltages across the segments are: 1. VON(RMS) VDD Outputs 2. VOFF(RMS)...
Page 5 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 progra...
Page 6 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 When S1 and S2 are connected t...
Page 7 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...
Page 8 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C 5 VVDD clears cells incrementing counters store pulse 5 VVDD t , t = 4 to 6 ms WE t = 1 to 1.5 µs L pulse generators ...
Page 9 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...
Page 10 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C CHARACTERISTICS VDD to V; VSS V; Tamb −40 to +85 °C; crystal: f 4.194304 MHz; Rs Ω; CL p F; maximum frequency toleran...
Page 11 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C CHIP DIMENSIONS AND BONDING PAD LOCATIONS E2 COL C2 LE F3 E3 AD3 PCF1174CU 3.02 mm S1 SEL DATA FLASH MSA998 2.12 mm C...
Page 12 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), ...
Page 13 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C APPLICATION INFORMATION BP segment drivers DECODER to LCD DECODER PCF1174C AM/PM HOURS MINUTES SECONDS COUNTER COUNTE...
Page 14 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 pin 1 index detail X 10 mm sc...
Page 15 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 con...
Page 16 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 prod...
Page 17 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES
Page 18 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES
Page 19 Philips Semiconductors Product specification 4-digit static LCD car clock PCF1174C NOTES
Page 20 Philips Semiconductors – a worldwide company Argentina: see South America Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB, Tel. +31 82785, Fax. +31 Australia: 34 Waterloo Road, NORTH RYDE, NSW...

Manual Details

Brand Philips
Pages 20
File Size 121.21 KB
Published July 04, 2026
4 views

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Frequently Asked Questions

Is a trimming capacitor needed for time calibration?

No trimming capacitor is required because the time calibration and oscillator voltage are electrically programmable via an EEPROM.

How can I switch between 12-hour or 24-hour timing modes?

The mode is set by connecting the MODE input either to Vcc for 12-hour or to GND for 24-hour operation.

What are the environmental limits for this component?

The circuit operates across an ambient temperature range from −40 to +85 °C.

How does the device maintain contrast despite temperature changes?

An adjustable voltage regulator controls the supply voltage in relation to temperature, ensuring good screen contrast.