My Inquiry
My Account
NXP Semiconductors PCF1179CT,112
- Part No.:
- PCF1179CT,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCF1179CT,112.pdf
- Description:
- IC DRVR 7 SEGMENT 4 DIGIT 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,662
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PCF1179CT,112 from NXP Semiconductors is a single-chip 4.19 MHz automotive LCD clock IC delivering hours, minutes, and seconds with 4-digit duplex LCD drive capability. It integrates an electrically programmable voltage regulator, EEPROM-based time calibration, and 12/24-hour mode selection. Designed for battery-powered car dashboards, it operates across −40 °C to +85 °C with internal oscillator and push-button time setting.
For engineers reviewing the PCF1179CT,112 datasheet, PCF1179CT,112 pinout, PCF1179CT,112 application, or PCF1179CT,112 equivalent, key selection considerations include its SO28 package, LCD backplane voltage temperature compensation, 4.19 MHz crystal interface, EEPROM-programmable calibration, and dual-mode (12/24-hour) operation in automotive timing systems.
Technical Context
The PCF1179CT,112 implements a 4.194304 MHz crystal oscillator with ±30 ppm tolerance, driving a 1:2 multiplexed duplex LCD via 26 segment drivers and two backplane outputs (BP1/BP2). Its internal voltage regulator adjusts VDD between 3 V and 6 V based on ambient temperature to maintain LCD contrast - e.g., 5–6 V at −40 °C and 3–4 V at +85 °C when programmed to 4.5 V at 25 °C.
Time calibration compensates crystal frequency deviation by inhibiting up to 31 pulses of 262.144 Hz per second, stored non-volatily in on-chip EEPROM. Mode selection (12/24-hour), colon flashing (1 Hz or static), and test speed-up are controlled via dedicated digital inputs (MODE, FLASH, TS), all with internal pull-up/pull-down resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 4.194304 MHz - precisely matches standard quartz crystals for automotive clock accuracy |
| Operating Temperature | −40 °C to +85 °C - qualified for under-hood and dashboard environments |
| Supply Voltage Range | 3 V to 6 V - regulated internally from battery via external resistor; supports wide automotive input variation |
| LCD Drive | 4-digit duplex (1:2 multiplex) - drives common automotive 4-digit segmented displays without external drivers |
| EEPROM Functions | Voltage regulation & time calibration programming - eliminates trimming capacitors and manual calibration |
| Package | SO28 (SOT136-1), 7.5 mm body width - surface-mount compatible with standard reflow profiles |
| Supply Current | 700–950 µA typical - enables multi-year battery life in always-on vehicle clocks |
Pinout & Package
PCF1179CT,112 is housed in a 28-lead plastic small outline package (SO28, SOT136-1) with 7.5 mm body width and 1.27 mm lead pitch. The package supports standard reflow soldering and meets JEDEC moisture sensitivity level requirements for automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S1 | Hour adjustment input | Pull-up enabled; connects to VSS to increment hour display with auto-repeat after 1 s |
| DATA | EEPROM data input | Accepts programming pulses for voltage and calibration settings; requires VPP = VDD −5 V during write |
| OSC_IN / OSC_OUT | Crystal oscillator interface | Drives 4.194304 MHz quartz; supports CL = 12 pF and Rs = 50 Ω for stable timing |
| MODE | 12/24-hour mode select | Connected to VDD → 12-hour; VSS → 24-hour; open → toggles mode on reset |
| VPP | EEPROM programming voltage | Requires VDD −5 V for EEPROM writes; internal pull-up mandates explicit VDD connection in normal operation |
| TS | Test speed-up mode input | VSS enables accelerated display testing (64× faster debounce/auto-increment); pull-up requires VDD tie for safety |
| ENABLE | Time-setting enable control | VDD enables S1/S2 inputs; VSS disables time adjustment to prevent accidental changes |
| FLASH | Colon flash control | VDD → 1 Hz blinking colon; VSS → static colon display |
| B1–B4, G1–G4, etc. | LCD segment drivers | 26 dedicated outputs for 4-digit duplex LCD; support VON(RMS) = 0.79VDD and VOFF(RMS) = 0.35VDD |
| BP1 / BP2 | LCD backplane outputs | Generate three-level signals (VDD, VDD/2, 0) for 1:2 multiplexed contrast optimization |
Key Features
| Feature | Design Value |
|---|---|
| Electrically programmable voltage regulator | Adjusts LCD supply voltage across temperature to maintain consistent contrast without external components |
| EEPROM-based time calibration | Compensates crystal tolerance (±30 ppm) via 31-step pulse inhibition - no manual trimming required |
| Dual time format support | Hardware-selectable 12-hour or 24-hour mode via MODE pin; retains setting through power cycles |
| Integrated 4.19 MHz oscillator | Drives standard automotive quartz crystals directly; includes feedback resistor (300–3000 kΩ) and load capacitance support |
| Push-button time setting with debounce | Internal 30–100 ms debounce and auto-repeat logic simplifies mechanical switch interface in harsh environments |
| Segment test/reset function | Simultaneous S1+S2 low activates all LCD segments; release resets display - enables factory visual verification |
Applications
| Automotive Instrument Cluster Clock | Aftermarket Car Stereo Display |
|---|---|
Use Scenario: Real-time clock display in OEM instrument clusters with battery backup and temperature extremes. IC Role / Device Role / Timing Role: Primary timekeeping and LCD driver IC; generates accurate seconds/hours/minutes and drives 4-digit duplex LCD directly. Use Value: Eliminates external oscillator, voltage regulator, and calibration components - reduces BOM count and layout area while meeting AEC-Q200 ambient requirements. |
Use Scenario: Time display in third-party car audio head units requiring compact, low-power, and easy-to-integrate clock functionality. IC Role / Device Role / Timing Role: Standalone clock controller interfacing to existing MCU via push buttons; handles all timing, display drive, and user interaction. Use Value: Enables rapid integration with minimal firmware overhead - time setting, colon control, and mode selection handled entirely in hardware. |
| Commercial Vehicle Dashboard Timer | Industrial Control Panel Clock |
Use Scenario: Duty-cycle logging and operator shift timing in trucks and buses where reliability over wide temperature ranges is critical. IC Role / Device Role / Timing Role: Battery-backed real-time clock with EEPROM-stored calibration; maintains accuracy despite voltage sags and thermal cycling. Use Value: Ensures timestamp integrity across ignition cycles and extended parking periods - supports compliance with fleet management reporting standards. |
Use Scenario: Operator-facing time display in industrial HMIs exposed to vibration, ESD, and extended operating life requirements. IC Role / Device Role / Timing Role: Dedicated LCD clock subsystem; isolates timing functions from main controller to improve system robustness. Use Value: Delivers HBM-rated (±2000 V) ESD protection and latch-up immunity (100 mA), reducing field failure risk in unshielded enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LCD clock applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF1178CT,112 | Same SO28 package and pinout; lacks EEPROM-based voltage regulation - uses fixed internal regulator | Requires external contrast adjustment circuitry; less suitable for wide-temperature automotive use | Select only if cost sensitivity outweighs need for automatic LCD contrast compensation |
| RV-3028-C7 | RTC with I²C interface; no integrated LCD drivers; requires external display controller and voltage scaling | Designed for microcontroller-based systems needing flexible UI; not a drop-in replacement for direct LCD drive | Choose when system already includes an MCU with display driver resources and demands higher time accuracy (±5 ppm) |
Compared with PCF1179CT,112, PCF1178CT,112 sacrifices temperature-compensated LCD voltage control for lower cost, while RV-3028-C7 shifts complexity to the host processor but offers superior long-term stability and digital configurability - neither provides the same integrated, self-contained automotive clock solution.
Availability
PCF1179CT,112 is available at Aetrix Electronics and suitable for automotive instrument clusters, aftermarket infotainment displays, and commercial vehicle dashboards requiring stable component supply, long-lifecycle support, and AEC-aligned qualification.
Supply support for PCF1179CT,112 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 is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PCF1179CT,112 belongs to NXP's legacy automotive clock IC family, engineered specifically for cost-sensitive, high-reliability dashboard timing applications with integrated LCD drive and EEPROM programmability.
FAQ
What is the primary function of the PCF1179CT,112 in automotive systems?
The PCF1179CT,112 serves as a fully integrated automotive clock IC that generates accurate hours, minutes, and seconds and directly drives a 4-digit duplex LCD display. It incorporates a 4.194304 MHz oscillator, EEPROM-programmable voltage regulation for LCD contrast, and time calibration - eliminating external components required for battery-operated car dashboard clocks. Its design targets direct implementation in instrument clusters without MCU intervention.
How does the PCF1179CT,112 handle temperature-dependent LCD contrast?
The PCF1179CT,112 dynamically adjusts its regulated output voltage (VDD) based on ambient temperature to maintain optimal LCD contrast: at −40 °C, VDD ranges 5–6 V; at +25 °C, it is programmed to 4.5 V; and at +85 °C, it drops to 3–4 V. This behavior is implemented in hardware using an internal temperature sensor and programmable regulator - no external thermistor or firmware control is needed. The PCF1179CT,112 achieves this while sustaining VON(RMS) = 0.79VDD and VOFF(RMS) = 0.35VDD for reliable segment visibility.
Can the PCF1179CT,112 be used without EEPROM programming?
Yes, the PCF1179CT,112 operates immediately after power-up with factory-default EEPROM settings: VDD regulated to 4.5 V at 25 °C and time calibration set to zero pulses inhibited. No programming is required for basic functionality. However, EEPROM programming is necessary to fine-tune LCD voltage for specific display modules or compensate for crystal frequency deviation beyond nominal ±60 ppm offset. Programming requires applying VPP = VDD −5 V and pulsing the DATA pin - a one-time process typically performed during manufacturing calibration.
What are the key differences between PCF1179CT,112 and PCF1178CT,112?
The PCF1179CT,112 adds EEPROM-programmable voltage regulation and enhanced time calibration capability compared to the PCF1178CT,112. While both share identical SO28 packaging, pinout, and core timing functions, only the PCF1179CT,112 supports temperature-adaptive LCD voltage control and 31-step crystal deviation correction. The PCF1178CT,112 uses a fixed internal regulator and lacks EEPROM-based calibration - making the PCF1179CT,112 the preferred choice for automotive applications demanding consistent display performance across −40 °C to +85 °C.
Does the PCF1179CT,112 require an external crystal, and what are the specifications?
Yes, the PCF1179CT,112 requires an external 4.194304 MHz quartz crystal connected between OSC_IN (Pin 3) and OSC_OUT (Pin 4). The datasheet specifies CL = 12 pF, Rs ≤ 50 Ω, and frequency tolerance ±30 × 10⁻⁶. A feedback resistor (300–3000 kΩ) must be placed externally between OSC_OUT and VSS. The PCF1179CT,112's oscillator circuit is designed for fundamental-mode crystals and supports fast start-up (<200 ms), making it suitable for automotive applications where immediate time display after ignition is required.
PCF1179CT,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
PCF1179CT,112 FAQ
1.How can I place an order for PCF1179CT,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF1179CT,112 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 PCF1179CT,112 reliable?
The price and inventory of PCF1179CT,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF1179CT,112 is usually 5 days.
3.What payment methods are accepted for PCF1179CT,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF1179CT,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF1179CT,112?
PCF1179CT,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF1179CT,112 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 PCF1179CT,112?
For technical support, including PCF1179CT,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF1179CT,112 requirements.
6.How does Aetrix verify that PCF1179CT,112 is sourced from the original manufacturer or authorized distributors?
All PCF1179CT,112 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 PCF1179CT,112 meets industry standards.
7.What is the process for return or replacement of PCF1179CT,112?
All PCF1179CT,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCF1179CT,112, 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 PCF1179CT,112 part is unused and in its original packaging.
Return procedure for PCF1179CT,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCF1179CT,112 Tags
-
PCA8561AHN/AY
NXP Semiconductors
-
SN74LS47N
Texas Instruments
-
PCF85176T/1Y
NXP Semiconductors
-
PCF85176H/1,518
NXP Semiconductors
-
BU9796AMUV-E2
Rohm Semiconductor
-
PCA85176H/Q900/1,5
NXP Semiconductors
-
PCF8537AH/1,518
NXP Semiconductors
-
LM3914VX/NOPB
Texas Instruments
-
PCF85134HL/1,118
NXP Semiconductors
-
AS1115-BSST
ams-OSRAM USA INC.
-
PCA8534AH/Q900/1,5
NXP Semiconductors
-
LM3914V/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
