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NXP Semiconductors PCF8579HT/1
- Part No.:
- PCF8579HT/1
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 64-TQFP
- Datasheet:
-
PCF8579HT/1.pdf
- Description:
- IC DRVR DOT MATRIX 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,725
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Product details
Overview
PCF8579HT/1 from NXP Semiconductors is a low-power CMOS LCD column driver IC designed for dot matrix graphic displays with 1:8 to 1:32 multiplex rates, 40 column outputs (C0–C39), 1280-bit display RAM, and I²C-bus interface - used in tandem with PCF8578 row driver to support up to 40960-dot displays in automotive information systems and industrial terminals.
For engineers reviewing the PCF8579HT/1 datasheet, PCF8579HT/1 pinout, PCF8579HT/1 application, or PCF8579HT/1 equivalent, this page delivers verified technical context, TQFP64 package mapping, I²C slave address configuration (SA0), multiplex rate selection (M[1:0]), bias voltage inputs (V3/V4/VLCD), and cascade synchronization (SYNC) functionality critical for large-format LCD system design.
Technical Context
The PCF8579HT/1 operates as a dedicated column driver paired with the PCF8578 row driver, forming a synchronized chip set for multiplexed LCDs. It implements hardware subaddressing via A0–A3 (4-bit code) and dual I²C slave addresses (0111100/0111101) selected by SA0, enabling up to 32 devices on one bus.
Its internal timing generator relies on external SYNC pulses from the PCF8578 to maintain inter-device phase alignment across cascaded configurations. Display RAM is organized as four 40-byte banks (32 × 40 bits), with auto-incremented addressing and bank-switching controlled via RAM-access and set-start-bank commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Multiplex rates | 1:8, 1:16, 1:24, or 1:32 - sets number of LCD rows driven per frame; determines required V3/V4 bias ratios and RMS contrast optimization |
| Column outputs | 40 (C0–C39) - drives 40 parallel LCD columns; unused pins left open-circuit per design guidance |
| Display RAM | 1280 bits (32 × 40) in 4 banks - stores full frame data; bank switching enables scrolling and pseudo-motion without host CPU intervention |
| I²C interface | 7-bit slave addresses 0x78/0x79 (SA0 = 0/1) - supports up to 32 devices on same bus; includes input filters on SDA/SCL for noise immunity |
| Supply ranges | VDD: 2.5 V to 6 V; VLCD: up to 9 V - separates logic and LCD voltage domains; allows independent bias generation for high-contrast operation |
| Power-on reset | Initializes display blank, 1:32 multiplex, bank 0, X/Y = 0,0, and character mode - ensures deterministic startup state without external reset circuitry |
Pinout & Package
PCF8579HT/1 is housed in a plastic thin quad flat package (TQFP64) with 64 leads, body size 10 × 10 × 1.0 mm (SOT357-1), optimized for single-plane PCB routing in multi-device LCD driver stacks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (Pin 7) | I²C serial data bidirectional line | Connects to microcontroller SDA with pull-up resistor; carries command/data bytes and acknowledgments per I²C protocol |
| SCL (Pin 8) | I²C serial clock input | Drives synchronous data transfer; requires external pull-up; timing must meet I²C standard setup/hold requirements |
| SYNC (Pin 9) | Cascade synchronization output | Driven by PCF8578 to coordinate frame timing across multiple PCF8579HT/1 devices in stacked configurations |
| CLK (Pin 10) | External clock input/output | Optional oscillator input for timing reference; may be driven by PCF8578 or external source depending on system architecture |
| VSS (Pin 11) | Ground reference | Digital ground for logic circuits; must be connected to system GND with low-impedance path to minimize noise coupling |
| TEST (Pin 12) | Factory test pin | Must be tied to VSS per datasheet; not intended for user functionality or signal routing |
| SA0 (Pin 13) | I²C slave address bit 0 | Selects between slave addresses 0x78 (SA0 = 0) or 0x79 (SA0 = 1); enables two independent device groups on same I²C bus |
| A3–A0 (Pins 14,16–18) | Hardware subaddress inputs | Set unique 4-bit identifier (0–15) for each PCF8579HT/1 in cascade; required for selective RAM access in multi-device systems |
| VDD (Pin 20) | Logic supply voltage | Provides power for internal logic, I²C interface, and RAM; range 2.5 V to 6 V supports wide host MCU compatibility |
| V3, V4 (Pins 22,23) | LCD bias voltage inputs | Accept externally generated bias voltages; values determined by multiplex rate and Voper per Table 4 for optimal contrast |
| VLCD (Pin 24) | LCD supply voltage | Drives LCD segment/column electrodes; max 9 V allows high-threshold or high-multiplex panels |
| C39–C0 (Pins 30–33,35–64,1–6) | LCD column driver outputs | 40 open-drain outputs driving LCD columns; each capable of sourcing/sinking current per LCD waveform requirements |
Key Features
| Feature | Design Value |
|---|---|
| Auto-incremented RAM addressing | Enables continuous byte streaming over I²C without repeated address commands - reduces bus overhead during full-frame updates |
| Display memory bank switching | Allows double-buffering and seamless scrolling by selecting top-of-display bank (0–3) independently of RAM write location |
| Optimized pinning for multi-device wiring | TQFP64 layout places C0–C39, A0–A3, and control signals to enable single-layer routing when cascading multiple PCF8579HT/1 units |
| ESD protection without VDD diode | SCL/SDA pins use ESD clamps not tied to VDD - permits partial VDD shutdown while maintaining I²C bus integrity during low-power modes |
| Power-On Reset (POR) | Guarantees known initial state (blank display, 1:32 mux, bank 0) - eliminates need for external POR circuit or firmware initialization sequence |
Applications
| Automotive Information Systems | Industrial Computer Terminals |
|---|---|
Use Scenario: Dashboard LCDs displaying vehicle status, navigation, and infotainment data in compact instrument clusters. IC Role / Device Role / Timing Role: Column driver synchronizing with PCF8578 row driver to render 32×40 dot matrix segments at 1:32 multiplex rate. Use Value: Enables high-contrast, low-power display operation under wide temperature ranges using programmable bias (V3/V4) and robust I²C communication. | Use Scenario: Operator interface panels in factory HMIs requiring reliable alphanumeric and icon-based LCDs. IC Role / Device Role / Timing Role: Cascaded column driver supporting large-area displays via SYNC-linked timing and hardware subaddressing (A0–A3). Use Value: Reduces host MCU load through auto-incremented RAM writes and bank-switching for real-time screen updates and scrolling. |
| Point-of-Sale Terminals | Telecommunication Systems |
Use Scenario: Compact retail checkout displays showing transaction details, pricing, and promotions on monochrome graphic LCDs. IC Role / Device Role / Timing Role: I²C-addressable column driver (slave address 0x78/0x79) interfacing directly with ARM Cortex-M microcontrollers. Use Value: Simplifies BOM with single-chip solution for 40-column drive; supports 1:16 multiplex for balanced speed/contrast in indoor environments. | Use Scenario: Front-panel LCDs on telecom base station controllers and network management units. IC Role / Device Role / Timing Role: Low-power column driver operating at 2.5 V logic supply while driving 9 V LCD panels via separate VLCD rail. Use Value: Extends battery life in backup-powered units through CMOS design and configurable sleep-ready I²C interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD column driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8579H/1 | LQFP64 package (10 × 10 × 1.4 mm); identical electrical specs and pinout except mechanical dimensions | Same functional role but thicker profile; may impact board height constraints in ultra-thin enclosures | Select PCF8579H/1 only if thermal or mechanical mounting requirements favor LQFP over TQFP |
| PCF8579T/1 | VSO56 package (56-pin SO); reduced pin count omits n.c. pins and repositions some controls; 40-column drive unchanged | Smaller footprint but incompatible pinout; requires PCB redesign and cannot substitute directly in TQFP64 layouts | Choose PCF8579T/1 for space-constrained designs where 56-pin SO routing is preferred and cascade count is limited |
Compared with PCF8579HT/1, the PCF8579H/1 offers identical functionality in a slightly taller LQFP package, while the PCF8579T/1 provides the same core column-driving capability in a smaller SO package with different pin assignment - neither is pin-compatible, but all three share identical command set, RAM structure, and I²C protocol.
Availability
PCF8579HT/1 is available at Aetrix Electronics and suitable for automotive information systems, industrial computer terminals, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability for safety-critical or regulated deployments.
Supply support for PCF8579HT/1 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in interface, analog, and display driver technologies.
The PCF8579HT/1 belongs to NXP's legacy LCD driver product line, engineered specifically for cost-effective, high-reliability dot matrix graphic display systems requiring precise multiplex control, low power consumption, and seamless integration with companion row drivers like PCF8578.
FAQ
What is the maximum number of PCF8579HT/1 devices that can operate on a single I²C bus?
The PCF8579HT/1 supports up to 32 devices on one I²C bus using two slave addresses (0x78 and 0x79) selected by the SA0 pin. Each group of up to 16 devices must have unique hardware subaddresses (A0–A3), ensuring individual RAM access without bus contention. This configuration is validated in NXP's application examples and matches the PCF8579HT/1 datasheet Section 8.7.2.
Does the PCF8579HT/1 require an external row driver, and if so, which one is recommended?
Yes, the PCF8579HT/1 requires an external row driver - it is explicitly designed to operate with the PCF8578 LCD row/column driver. The two ICs form a matched chipset: PCF8579HT/1 handles 40 column outputs while PCF8578 manages row scanning and timing synchronization via the SYNC pin. This pairing is documented in the PCF8579HT/1 datasheet General Description and Functional Description sections.
How does the PCF8579HT/1 handle display memory when multiple devices are cascaded?
In cascaded configurations, the PCF8579HT/1 uses hardware subaddressing (A0–A3) to route I²C commands and data to specific devices. The subaddress counter compares incoming device-select commands against physical pin states, allowing targeted RAM writes across up to 16 devices per slave address. Data pointer auto-increment spans hardware boundaries only when enabled via command sequence - confirmed in Section 8.7.2 and Figure 17 of the PCF8579HT/1 datasheet.
What are the valid voltage ranges for VLCD and VDD on the PCF8579HT/1, and can they be operated independently?
The PCF8579HT/1 supports independent operation: VDD ranges from 2.5 V to 6 V for logic functions, while VLCD accepts up to 9 V for LCD panel drive. Per Table 13 (Limiting Values), VLCD may be as low as VDD −11 V, enabling negative bias generation. This separation is essential for achieving optimal RMS contrast across multiplex rates and is implemented in all verified PCF8579HT/1 reference designs.
Is the PCF8579HT/1 still recommended for new designs, or is it obsolete?
The PCF8579HT/1 is marked "Should not be used for new designs" in NXP's official ordering information (Table 1 footnote [1]). However, it remains actively supported for legacy program continuity, with full datasheet availability, existing inventory, and Aetrix Electronics' lifecycle management services - including obsolescence monitoring and last-time-buy coordination for industrial and automotive customers reliant on proven display subsystems.
PCF8579HT/1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 64-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- Dot Matrix
- Interface:
- I2C
- Digits or Characters:
- -
- Current - Supply:
- 9 µA
- Voltage - Supply:
- 2.5V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
PCF8579HT/1 FAQ
1.How can I place an order for PCF8579HT/1 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8579HT/1 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 PCF8579HT/1 reliable?
The price and inventory of PCF8579HT/1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8579HT/1 is usually 5 days.
3.What payment methods are accepted for PCF8579HT/1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8579HT/1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8579HT/1?
PCF8579HT/1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8579HT/1 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 PCF8579HT/1?
For technical support, including PCF8579HT/1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8579HT/1 requirements.
6.How does Aetrix verify that PCF8579HT/1 is sourced from the original manufacturer or authorized distributors?
All PCF8579HT/1 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 PCF8579HT/1 meets industry standards.
7.What is the process for return or replacement of PCF8579HT/1?
All PCF8579HT/1 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8579HT/1, 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 PCF8579HT/1 part is unused and in its original packaging.
Return procedure for PCF8579HT/1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCF8579HT/1 Tags
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