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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Display Drivers

NXP Semiconductors PCF1175CT/F2,118

Name: PCF1175CT/F2,118
Brand: NXP Semiconductors
SKU: PCF1175CT/F2,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCF1175CT/F2,118

Manufacturer:: NXP Semiconductors

Category:: Display Drivers

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: PCF1175CT/F2,118.pdf

Description:: IC DRVR 7 SEGMENT 4 DIGIT 28SO

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Product details

Overview

PCF1175CT/F2,118 from NXP Semiconductors (formerly Philips) is a single-chip 4-digit duplex LCD car clock IC with integrated 4.19 MHz oscillator, programmable voltage regulator, and EEPROM-based time calibration. It drives automotive-grade LCD displays in 12- or 24-hour mode, operates from −40 to +85 °C, and supports battery-powered operation via external resistor and 47 µF capacitor.

For engineers reviewing the PCF1175CT/F2,118 datasheet, PCF1175CT/F2,118 pinout, PCF1175CT/F2,118 application, or PCF1175CT/F2,118 equivalent, this page delivers verified functional role, SO28 package mapping, segment/backplane driver architecture, temperature-compensated LCD voltage control, and real-world automotive timing use cases - all grounded in the 1997 Philips product specification.

Technical Context

The PCF1175CT/F2,118 implements a CMOS-based timekeeping system with a fixed 4.194304 MHz crystal oscillator, internal 1:2 multiplexed duplex LCD driver, and three-level backplane generation (BP1/BP2). Its EEPROM stores both LCD voltage programming steps (up to 31 × 150 mV increments) and time calibration pulses (n = 0–31) to compensate for crystal tolerance.

It uses electrically programmable internal voltage regulation with temperature-dependent output (e.g., VDD = 3–4 V at +85 °C; 5–6 V at −40 °C when programmed to 4.5 V at 25 °C), and features dedicated inputs for hour/minute adjustment (S1/S2), 12/24-hour mode selection (MODE), colon flashing (FLASH), and test speed-up (TS).

Key Specifications

Parameter	Value and Actual Design Meaning
Oscillator Frequency	4.194304 MHz - provides precise timebase for seconds/minutes/hours counters; nominal crystal deviation +60 ppm compensated via EEPROM-stored pulse inhibition.
LCD Drive Architecture	1:2 multiplexed duplex - enables 4-digit display with shared segment lines and two independent backplanes (BP1/BP2) for reduced pin count and power.
Operating Temperature	−40 to +85 °C - qualified for under-dash automotive environments; voltage regulator adjusts VDD to maintain contrast across full range.
Supply Current	700–950 µA typical - ultra-low power enables direct battery operation (e.g., 12 V via 6.8 kΩ resistor and 47 µF capacitor).
EEPROM Functions	Two independent non-volatile storage areas - one for LCD voltage (31-step 150 mV increments), one for time calibration (31-step backplane period adjustment).
Segment Output Drive	VON(RMS) = 0.79 VDD, VOFF(RMS) = 0.35 VDD - ensures high-contrast LCD operation with controlled RMS voltage across segments.
Package	SO28 (SOT136-1) - 28-lead plastic small outline, 7.5 mm body width, surface-mount compatible with reflow/wave soldering per JEDEC MS-013AE.

Pinout & Package

PCF1175CT/F2,118 is housed in a 28-lead plastic small outline package (SO28, SOT136-1), 7.5 mm body width, compliant with JEDEC MS-013AE. Pin 1 index marked; lead pitch 1.27 mm; max height 2.65 mm.

Pin/Terminal	Circuit Role	Design Meaning
S1	Hour adjustment input	Pull-up enabled; debounced; auto-increment on hold for rapid hour setting - no external RC required.
DATA	EEPROM data input	Serial programming interface for voltage and calibration settings; accepts tE/tL/tW pulses per Fig.6.
OSC IN / OSC OUT	Crystal oscillator terminals	Drive 4.194304 MHz quartz; internal feedback resistor (300–3000 kΩ) eliminates external component.
VSS / VDD	Negative / positive supply	Single-supply operation (3–6 V); internal regulator derives LCD bias from VDD; reverse-polarity safe up to 10 mA.
MODE	12/24-hour mode select	Connect to VDD for 12-hour, VSS for 24-hour; open-circuit toggles mode on reset.
FLASH	Colon display control	Connect to VDD for 1 Hz blinking colon; VSS for static colon - no software overhead.
BP1 / BP2	Three-level backplane outputs	Generate complementary 15.625 ms period waveforms; enable low-power duplex LCD drive with minimal external components.
B4/C4 to A2/ADEG1	Segment drivers	20 dedicated segment outputs (including AM/PM, COL, DEG) support full 4-digit alphanumeric display with colon and status indicators.

Key Features

Feature	Design Value
Electrically programmable LCD voltage	31-step adjustment (±150 mV/step) via EEPROM - eliminates trimming capacitors and enables field calibration for aging or temperature drift.
Temperature-compensated VDD regulation	Output shifts from 5–6 V at −40 °C to 3–4 V at +85 °C when set to 4.5 V at 25 °C - maintains optimal LCD contrast without external thermal sensing.
No-external-component time calibration	Crystal tolerance compensated by inhibiting 262144 Hz pulses (n = 0–31 stored in EEPROM) - achieves ±7.63 µs/day accuracy without hardware mods.
Dedicated 1 Hz set mode	Hardware-accelerated time setting: S1/S2 auto-increment at 1/sec after 1 sec hold - enables fast, bounce-immune manual adjustment with SPST switches.
Integrated 4.19 MHz oscillator	On-chip feedback resistor (300–3000 kΩ) and 16/27 pF input/output capacitance - reduces BOM by eliminating external R and C for crystal drive.

Applications

Automotive Instrument Cluster	Aftermarket Car Stereo Display
Use Scenario: Integrated into OEM or Tier-1 dashboard modules requiring compact, low-power time display with high-temperature reliability. IC Role / Device Role / Timing Role: Primary timekeeping and LCD driver - replaces discrete counter + driver + regulator solution with single SO28 IC. Use Value: Reduces PCB area by >60% vs. multi-chip alternatives; eliminates manual trimmer adjustment; withstands −40 to +85 °C without contrast loss.	Use Scenario: Used in replacement head units where space-constrained PCBs must support 4-digit time, AM/PM, and colon indicators. IC Role / Device Role / Timing Role: Standalone clock controller - interfaces directly to generic 4-digit duplex LCD glass with no microcontroller involvement. Use Value: Enables plug-and-play time display using only two SPST switches (S1/S2) and no firmware - ideal for cost-sensitive consumer audio systems.
Commercial Vehicle Telematics Panel	Industrial Dashboard Timer
Use Scenario: Mounted in truck cab HMI panels requiring long-term time accuracy and resistance to vibration-induced contact bounce. IC Role / Device Role / Timing Role: Robust time source with hardware debounce (30–100 ms) and EEPROM-retained calibration - immune to switch chatter during rough-road operation. Use Value: Guarantees reliable time setting even with low-quality mechanical switches; retains calibration through battery disconnect cycles.	Use Scenario: Embedded in factory automation HMIs where display must remain legible across wide ambient temperature swings (e.g., unheated warehouses). IC Role / Device Role / Timing Role: Temperature-adaptive LCD driver - dynamically adjusts VDD to preserve contrast from −40 to +85 °C without external thermal compensation circuitry. Use Value: Eliminates need for thermistor networks or microcontroller-based VDD scaling - cuts BOM and firmware complexity.

Automotive Instrument Cluster

Aftermarket Car Stereo Display

Use Scenario: Integrated into OEM or Tier-1 dashboard modules requiring compact, low-power time display with high-temperature reliability.

IC Role / Device Role / Timing Role: Primary timekeeping and LCD driver - replaces discrete counter + driver + regulator solution with single SO28 IC.

Use Value: Reduces PCB area by >60% vs. multi-chip alternatives; eliminates manual trimmer adjustment; withstands −40 to +85 °C without contrast loss.

Use Scenario: Used in replacement head units where space-constrained PCBs must support 4-digit time, AM/PM, and colon indicators.

IC Role / Device Role / Timing Role: Standalone clock controller - interfaces directly to generic 4-digit duplex LCD glass with no microcontroller involvement.

Use Value: Enables plug-and-play time display using only two SPST switches (S1/S2) and no firmware - ideal for cost-sensitive consumer audio systems.

Commercial Vehicle Telematics Panel

Industrial Dashboard Timer

Use Scenario: Mounted in truck cab HMI panels requiring long-term time accuracy and resistance to vibration-induced contact bounce.

IC Role / Device Role / Timing Role: Robust time source with hardware debounce (30–100 ms) and EEPROM-retained calibration - immune to switch chatter during rough-road operation.

Use Value: Guarantees reliable time setting even with low-quality mechanical switches; retains calibration through battery disconnect cycles.

Use Scenario: Embedded in factory automation HMIs where display must remain legible across wide ambient temperature swings (e.g., unheated warehouses).

IC Role / Device Role / Timing Role: Temperature-adaptive LCD driver - dynamically adjusts VDD to preserve contrast from −40 to +85 °C without external thermal compensation circuitry.

Use Value: Eliminates need for thermistor networks or microcontroller-based VDD scaling - cuts BOM and firmware complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD car clock applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCF1176CT	Same SO28 package and pinout; adds 24-hour alarm output (ALM pin) and separate alarm enable (ALEN); identical oscillator, EEPROM, and LCD drive architecture.	Required when audible/visual alarm functionality is needed alongside time display - not drop-in; ALM/ALEN pins must be routed and driven.	Select PCF1176CT only if alarm feature is mandatory; otherwise PCF1175CT/F2,118 offers lower cost and simpler layout.
PCF1174CT	SO28 package; lacks EEPROM-based voltage programming and time calibration - uses external trimmer for LCD bias and fixed crystal load; no VPP/SEL/DATA programming interface.	Suitable for cost-sensitive, non-field-serviceable designs where factory-set calibration suffices and temperature drift is mitigated mechanically.	Choose PCF1174CT for lowest BOM cost in high-volume production where field recalibration is unnecessary; PCF1175CT/F2,118 preferred for serviceability and wide-temp reliability.

Compared with PCF1176CT, PCF1175CT/F2,118 omits alarm logic but simplifies design and reduces layout risk; versus PCF1174CT, it trades minor cost increase for field-programmable accuracy and contrast stability - critical for automotive deployments requiring zero-touch maintenance.

Availability

PCF1175CT/F2,118 is available at Aetrix Electronics and suitable for automotive instrument clusters, aftermarket stereo displays, commercial vehicle telematics panels, and industrial dashboard timers requiring stable component supply across extended temperature ranges and long lifecycle commitments.

Supply support for PCF1175CT/F2,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-reliability automotive and industrial ICs, with deep expertise in timing, display, and power management solutions for harsh-environment applications.

The PCF1175CT/F2,118 belongs to Philips' legacy car clock IC family designed specifically for cost-effective, standalone LCD timekeeping in automotive dashboards - prioritizing EEPROM programmability, temperature resilience, and minimal external component count.

FAQ

What is the primary function of the PCF1175CT/F2,118?

The PCF1175CT/F2,118 is a dedicated 4-digit duplex LCD car clock IC that integrates timekeeping (hours/minutes/seconds), 4.19 MHz crystal oscillator, programmable voltage regulator, EEPROM-based calibration, and segment/backplane LCD drivers in a single SO28 package. It requires no microcontroller and operates autonomously with only two SPST switches for time setting.

How does the PCF1175CT/F2,118 achieve temperature-stable LCD contrast?

The PCF1175CT/F2,118 uses an internal voltage regulator whose output varies with temperature: when programmed to 4.5 V at 25 °C, it delivers 5–6 V at −40 °C and 3–4 V at +85 °C. This compensates for LCD's voltage-dependent contrast shift, maintaining readability across the full −40 to +85 °C operating range without external sensors or circuitry.

Can the PCF1175CT/F2,118 be used without EEPROM programming?

Yes - the PCF1175CT/F2,118 powers up and functions with factory-default EEPROM values: LCD voltage preset to mid-range and time calibration set to n = 0. Programming (via VPP, SEL, DATA) is optional and only required for fine-tuning contrast or correcting crystal tolerance beyond nominal +60 ppm deviation.

What are the key differences between PCF1175CT/F2,118 and PCF1174CT?

The PCF1175CT/F2,118 includes EEPROM-based LCD voltage programming and time calibration, while the PCF1174CT relies on external trimmers for both. PCF1175CT/F2,118 also features temperature-compensated regulation and higher integration - making it suitable for field-serviceable or wide-temp automotive use where PCF1174CT serves cost-optimized, factory-calibrated applications.

Does the PCF1175CT/F2,118 support both 12-hour and 24-hour time formats?

Yes - the PCF1175CT/F2,118 supports both modes via the MODE pin: connect MODE to VDD for 12-hour format (e.g., "1:23 PM"), or to VSS for 24-hour format (e.g., "13:23"). An open-circuit MODE pin causes automatic mode toggle on power-on reset, enabling flexible configuration without hardware changes.

PCF1175CT/F2,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Display Type:: LCD

Configuration:: 7 Segment

Interface:: -

Digits or Characters:: 4 Digits

Current - Supply:: 950 µA

Voltage - Supply:: 3V ~ 6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SO

PCF1175CT/F2,118 FAQ

1.How can I place an order for PCF1175CT/F2,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCF1175CT/F2,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PCF1175CT/F2,118 reliable?

The price and inventory of PCF1175CT/F2,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF1175CT/F2,118 is usually 5 days.

3.What payment methods are accepted for PCF1175CT/F2,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF1175CT/F2,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCF1175CT/F2,118?

PCF1175CT/F2,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCF1175CT/F2,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PCF1175CT/F2,118?

For technical support, including PCF1175CT/F2,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF1175CT/F2,118 requirements.

6.How does Aetrix verify that PCF1175CT/F2,118 is sourced from the original manufacturer or authorized distributors?

All PCF1175CT/F2,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCF1175CT/F2,118 meets industry standards.

7.What is the process for return or replacement of PCF1175CT/F2,118?

All PCF1175CT/F2,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCF1175CT/F2,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PCF1175CT/F2,118 part is unused and in its original packaging.

Return procedure for PCF1175CT/F2,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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