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NXP Semiconductors PCF8576CHL/1,157
- Part No.:
- PCF8576CHL/1,157
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 64-LQFP
- Datasheet:
-
PCF8576CHL/1,157.pdf
- Description:
- IC DRVR 7 SEGMENT 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,567
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Product details
Overview
PCF8576CHL/1,157 from NXP Semiconductors is a universal LCD controller and driver IC designed for low-multiplex-rate segment displays. It supports up to 4 backplanes and 40 segments, delivers internal LCD bias generation, operates from 2 V to 6 V logic/LCD supply, and communicates via I²C-bus - enabling direct interface with microcontrollers in battery-powered instrumentation and consumer display modules.
For engineers reviewing the PCF8576CHL/1,157 datasheet, PCF8576CHL/1,157 pinout, PCF8576CHL/1,157 application, or PCF8576CHL/1,157 equivalent, key selection criteria include static/1:2/1:3/1:4 multiplex drive mode support, 40 × 4-bit display RAM with auto-incremented addressing, integrated voltage-follower LCD bias buffers, power-saving mode operation, and LQFP64 package compatibility with plane-wiring optimization.
Technical Context
The PCF8576CHL/1,157 implements a synchronous LCD drive architecture with an internal oscillator (enabled via OSC–VSS) or external clock input (OSC–VDD), generating frame frequencies of 69 Hz (normal mode) or 65 Hz (power-saving mode). Its timing engine sequences display RAM → shift register → display register transfers while maintaining synchronization across cascaded devices using the SYNC pin.
It integrates a 40 × 4-bit static display RAM with bank-switching capability in static/duplex modes, subaddress decoding (A0–A2), and hardware-controlled blinking. The LCD bias generator produces 1/2 or 1/3 bias voltages from internal resistor dividers between VDD and VLCD, eliminating external bias components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Display Drive Capability | Up to 4 backplanes and 40 segments - supports static, 1:2, 1:3, or 1:4 multiplexed LCDs including 20×7-segment or 10×14-segment alphanumeric displays. |
| I²C Interface | Standard-mode (100 kHz) bidirectional bus - enables microcontroller communication with minimal software overhead and auto-incremented RAM addressing. |
| Supply Voltage Range | VDD = 2 V to 6 V - accommodates both low-threshold (e.g., STN) and high-threshold (e.g., twisted nematic) LCD panels without level-shifting. |
| Display RAM | 40 × 4-bit static RAM - stores full display state; data pointer auto-increments by 2 (1:4), 3 (1:3), 4 (1:2), or 8 (static) per byte write. |
| LCD Bias Generation | Internal voltage-follower buffers with selectable 1/2 or 1/3 bias - eliminates need for external resistive divider or charge pump in all configurations. |
| Power Modes | Normal-power and power-saving modes - reduces clock frequency by factor of 6 in power-saving mode for ultra-low current in battery applications. |
| Frame Frequency | 69 Hz (normal) or 65 Hz (power-saving) at fclk = 200 kHz - ensures flicker-free visible display while maintaining timing margin for I²C data throughput. |
Pinout & Package
LQFP64 package (SOT314-2), 10 × 10 × 1.4 mm body, with optimized pin layout for single- and multi-device plane wiring. Pin 1 is top-left corner (notch-mark side), pin count includes 4 no-connect (n.c.) positions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (10) | I²C serial data I/O | Open-drain bidirectional line - requires external pull-up; handles command/data transfer and ACK/NACK signaling. |
| SCL (11) | I²C serial clock input | Master-generated clock - synchronizes all I²C transactions; minimum 125 kHz required for 100 kHz bus rate. |
| SYNC (12) | Cascade synchronization I/O | Propagates timing alignment signal between daisy-chained PCF8576C devices to prevent frame skew. |
| CLK (13) | External clock I/O or output | Outputs internal oscillator signal when OSC = VSS; becomes input when OSC = VDD - enables system-wide clock distribution. |
| BP0–BP3 (25–28) | LCD backplane outputs | Drive four independent backplane waveforms; configurable for static, 1:2, 1:3, or 1:4 multiplex - unused pins may be left open. |
| S0–S39 (2–7, 29–32, 34–47, 49–64) | LCD segment outputs | 40 dedicated CMOS outputs - directly connect to LCD segment electrodes; unused outputs must remain unconnected. |
| VLCD (21) | LCD supply voltage input | Reference for internal bias generator - sets full-scale LCD operating voltage (Voper = VDD − VLCD); supports temperature compensation. |
| VDD (14), VSS (20) | Logic supply rails | Separate logic (VDD/VSS) and LCD (VLCD) supplies - allows independent voltage optimization for MCU interface and display contrast. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD bias generation | Eliminates external bias resistors or charge pumps - reduces BOM count and PCB area in space-constrained designs. |
| Auto-incremented RAM addressing | Reduces I²C transaction count during full-display updates - improves firmware efficiency and lowers CPU load in real-time UI systems. |
| Cascadable architecture | Enables expansion to 2560 display elements (64 × PCF8576C) using SYNC and CLK signals - supports large custom segment panels without FPGA or ASIC. |
| Selectable multiplex drive modes | Hardware-configurable 1:1 (static), 1:2, 1:3, or 1:4 drive - matches diverse LCD module requirements without redesigning driver circuitry. |
| Power-saving mode | Reduces dynamic power consumption by >80 % - extends battery life in portable meters, thermostats, and telecom handsets. |
Applications
| Industrial Panel Meters | Consumer Appliance Displays |
|---|---|
Use Scenario: Digital multimeter or flow meter with 4-digit 7-segment LCD and status icons. IC Role / Device Role / Timing Role: Primary LCD controller driving 4 backplanes and 32 segments; generates multiplexed waveforms and internal bias. Use Value: Single-chip solution replaces discrete bias generator + microcontroller GPIO expansion - cuts component count and simplifies EMC layout. | Use Scenario: Microwave oven or washing machine control panel with alphanumeric + icon display. IC Role / Device Role / Timing Role: Standalone segment driver interfacing to 8-bit MCU via I²C; manages blinking indicators and segment remapping. Use Value: Hardware subaddressing (A0–A2) allows multiple PCF8576CHL/1,157 on same bus - enables modular UI design with shared MCU resources. |
| Medical Diagnostic Devices | Telecom Handset Keypads |
Use Scenario: Portable blood glucose monitor with low-power static LCD and backlight control. IC Role / Device Role / Timing Role: Static-drive mode controller with VLCD-adjustable contrast; enters power-saving mode between readings. Use Value: 2 V minimum VDD enables direct Li-ion battery operation (3.0–4.2 V) with no regulator - improves energy efficiency and runtime. | Use Scenario: Feature phone keypad with segmented display showing signal strength, battery, and caller ID. IC Role / Device Role / Timing Role: Cascaded dual-PCF8576CHL/1,157 configuration driving 80 segments across two display zones. Use Value: SYNC pin synchronization ensures zero frame misalignment between upper/lower display sections - prevents visual tearing during scrolling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8576CT/1 | VSO56 package (56-pin), smaller footprint (7.2 × 4.4 × 1.2 mm), identical electrical specs and pinout mapping for SDA/SCL/BP/S pins. | Preferred for ultra-compact PCBs where height <1.2 mm is critical; lacks n.c. pins present in LQFP64 - requires revised layout. | Select PCF8576CT/1 when board space is constrained and thermal dissipation permits lower package mass. |
| PCF8575T | 16-bit I/O expander (no LCD bias, no multiplex timing engine); requires external LCD driver circuitry and bias network. | Only suitable for static LCDs with external drive - cannot replace PCF8576CHL/1,157 in multiplexed applications or where integrated bias is required. | Choose PCF8575T only if existing design already uses discrete LCD drivers and only needs GPIO expansion. |
Compared with PCF8576CT/1, the PCF8576CHL/1,157 offers superior thermal performance and mechanical robustness in LQFP64; versus PCF8575T, it delivers complete LCD subsystem integration - eliminating six external components and reducing firmware complexity by handling multiplex sequencing and bias generation in hardware.
Availability
PCF8576CHL/1,157 is available at Aetrix Electronics and suitable for industrial panel meters, consumer appliance displays, medical diagnostic devices, and telecom handset keypads requiring stable component supply and long-term lifecycle support.
Supply support for PCF8576CHL/1,157 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in mixed-signal IC design and embedded processing.
The PCF8576C product line was engineered specifically for cost-sensitive, low-power segment LCD interfaces - targeting applications where microcontroller GPIO scarcity, display complexity, and battery life constrain traditional driver approaches.
FAQ
What LCD configurations does the PCF8576CHL/1,157 support?
The PCF8576CHL/1,157 supports static (1 backplane), 1:2, 1:3, and 1:4 multiplexed LCDs with up to 40 segments. It drives up to 20 seven-segment characters, 10 fourteen-segment characters, or 160 graphic elements. Configuration is selected via mode-set commands and hardware subaddressing (A0–A2), with bias set to 1/2 or 1/3 depending on multiplex ratio - all verified in the PCF8576CHL/1,157 datasheet Section 7.3.
Does the PCF8576CHL/1,157 require external components for LCD biasing?
No, the PCF8576CHL/1,157 includes an internal LCD bias generator with voltage-follower buffers and selectable 1/2 or 1/3 bias configuration - eliminating external resistors, capacitors, or charge pumps. This is confirmed in Section 7.2 and Figure 6 of the PCF8576CHL/1,157 datasheet, and applies across all supported drive modes.
How does the PCF8576CHL/1,157 handle cascading for larger displays?
The PCF8576CHL/1,157 uses the SYNC pin for inter-device timing synchronization and CLK pin for clock distribution in cascaded systems. Display data auto-wraps to the next device when the subaddress counter matches hardware inputs (A0–A2), enabling up to 2560 elements with 64 devices - as specified in Section 7.13 and Table 5 of the PCF8576CHL/1,157 datasheet.
What is the power consumption behavior of the PCF8576CHL/1,157 in power-saving mode?
In power-saving mode, the PCF8576CHL/1,157 reduces its internal clock frequency by a factor of six, lowering dynamic power consumption significantly - ideal for battery-operated devices like handheld meters and telephones. Frame frequency drops from 69 Hz to 65 Hz at 200 kHz clock, and response time increases proportionally, but no data loss occurs - per Section 7.6 and Table 7 of the PCF8576CHL/1,157 datasheet.
Can unused segment or backplane outputs on the PCF8576CHL/1,157 be left unconnected?
Yes, unused segment outputs (S0–S39) and backplane outputs (BP0–BP3) on the PCF8576CHL/1,157 may be left open-circuit. Section 7.9 and 7.10 of the PCF8576CHL/1,157 datasheet explicitly state this, noting that in 1:2/1:3/1:4 modes, unused BP pins can be tied together to enhance drive capability - no pull-up/down or termination is required.
PCF8576CHL/1,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- Display Type:
- LCD
- Configuration:
- 7 Segment + DP, 14 Segment + DP + AP, Dot Matrix
- Interface:
- I2C
- Digits or Characters:
- 10 Characters, 20 Characters, 160 Elements
- Current - Supply:
- 120 µA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
PCF8576CHL/1,157 FAQ
1.How can I place an order for PCF8576CHL/1,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8576CHL/1,157 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 PCF8576CHL/1,157 reliable?
The price and inventory of PCF8576CHL/1,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8576CHL/1,157 is usually 5 days.
3.What payment methods are accepted for PCF8576CHL/1,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8576CHL/1,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8576CHL/1,157?
PCF8576CHL/1,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8576CHL/1,157 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 PCF8576CHL/1,157?
For technical support, including PCF8576CHL/1,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8576CHL/1,157 requirements.
6.How does Aetrix verify that PCF8576CHL/1,157 is sourced from the original manufacturer or authorized distributors?
All PCF8576CHL/1,157 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 PCF8576CHL/1,157 meets industry standards.
7.What is the process for return or replacement of PCF8576CHL/1,157?
All PCF8576CHL/1,157 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8576CHL/1,157, 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 PCF8576CHL/1,157 part is unused and in its original packaging.
Return procedure for PCF8576CHL/1,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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