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NXP Semiconductors PCF8576CH/1,157
- Part No.:
- PCF8576CH/1,157
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 64-LQFP
- Datasheet:
-
PCF8576CH/1,157.pdf
- Description:
- IC DRVR 7 SEGMENT 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
PCF8576CH/1,157 from NXP Semiconductors is a single-chip LCD controller and driver IC designed for static or low-multiplex-rate LCDs with up to 4 backplanes and 40 segments. It features I²C-bus interface, 40 × 4-bit display RAM, internal LCD bias generation, and selectable 1:1–1:4 multiplex drive modes. It is used in battery-powered instrumentation displays, industrial panel meters, and consumer appliance UIs.
For engineers reviewing the PCF8576CH/1,157 datasheet, PCF8576CH/1,157 pinout, PCF8576CH/1,157 application, or PCF8576CH/1,157 equivalent, this page delivers verified technical context, exact pin functions for LQFP64, real drive-mode trade-offs (e.g., 1:4 multiplex @ 1/3 bias yields 0.577×VLCD Von(RMS)), and two validated alternative drivers with documented functional differences.
Technical Context
The PCF8576CH/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 display RAM auto-increments per drive mode: +8 addresses in static, +4 in 1:2, +3 in 1:3, and +2 in 1:4 multiplex.
It supports hardware subaddressing (A0–A2) for cascading up to 8 devices, uses SDA/SCL for I²C communication at ≤100 kHz, and provides four independent backplane outputs (BP0–BP3) with configurable pairing-e.g., BP0/BP2 and BP1/BP3 tied in 1:2 mode for enhanced current drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Display Capacity | Up to 40 segments × 4 backplanes = 160 LCD elements; supports 20×7-segment or 10×14-segment alphanumeric layouts. |
| LCD Drive Modes | Static (1:1), 1:2, 1:3, or 1:4 multiplex; bias configurable as static, 1/2, or 1/3 - directly determines Von(RMS)/Voff(RMS) ratio and contrast. |
| I²C Interface | Standard-mode (≤100 kHz); SDA/SCL pins support bidirectional data transfer with auto-incremented addressing across subaddress boundaries. |
| Power Supply Range | VDD = 2 V to 6 V; VLCD independently adjustable - enables direct drive of low-threshold (2 V) or high-threshold twisted nematic (6 V) LCDs. |
| Frame Frequency | 69 Hz in normal-power mode (fclk/2880); 65 Hz in power-saving mode (fclk/480) - reduces dynamic power by ~6× at same clock frequency. |
| Display RAM | 40 × 4-bit static RAM; bit-mapped to segment/backplane outputs; one-to-one correspondence between RAM bits and LCD element on/off state. |
Pinout & Package
LQFP64 package (SOT314-2), 10 mm × 10 mm × 1.4 mm body, lead pitch 0.5 mm. Pin 1 marked with dot; thermal pad exposed on underside (connected to VDD per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (10) | I²C serial data I/O | Open-drain bidirectional line; requires external pull-up; handles command/data transfers and ACK/NACK signaling. |
| SCL (11) | I²C serial clock input | Master-generated clock; synchronizes all I²C transactions; minimum pulse width defined for 100 kHz operation. |
| SYNC (12) | Cascade synchronization I/O | Drives next device's SYNC input when outputting; accepts upstream SYNC to align frame timing across multiple PCF8576Cs. |
| CLK (13) | External clock input/output | Outputs internal oscillator signal when OSC = VSS; becomes input when OSC = VDD - must always be driven to avoid DC LCD bias. |
| OSC (15) | Oscillator enable control | Logic LOW (VSS) enables internal oscillator; HIGH (VDD) disables it and enables external clock mode - critical for power mode selection. |
| BP0–BP3 (25–28) | LCD backplane outputs | Drive complementary waveforms per selected multiplex mode; unused outputs left open-circuit; BP0/BP2 and BP1/BP3 may be paralleled in 1:2 mode. |
| S0–S39 (2–7, 29–32, 34–47, 49–64) | LCD segment outputs | Direct connection to LCD segment electrodes; output voltage swing referenced to VLCD; unused segments left floating. |
| VDD (14), VSS (20), VLCD (21) | Supply rails | VDD powers logic core (2–6 V); VSS = ground reference; VLCD sets LCD operating voltage - externally temperature-compensated for stable contrast. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD bias generator | Eliminates external resistor network; internal 3-resistor divider with switchable center tap enables 1/2 or 1/3 bias without external components. |
| Auto-incremented RAM addressing | Data pointer increments by 2 (1:4), 3 (1:3), 4 (1:2), or 8 (static) per byte written - ensures correct RAM fill order matching multiplex waveform sequencing. |
| Hardware subaddressing (A0–A2) | Enables up to 8 cascaded PCF8576CH/1,157 devices on one I²C bus; subaddress counter matches A0–A2 to route data only to targeted device. |
| Power-saving mode | Reduces frame frequency denominator from /2880 to /480 - cuts dynamic power ~6× while maintaining display visibility in low-update-rate applications like thermostats. |
| No external components required | Full LCD drive functionality achieved with only VDD, VSS, VLCD, and LCD panel - no capacitors, resistors, or external oscillators needed even in multi-device systems. |
Applications
| Industrial Panel Meters | Consumer Appliance UIs |
|---|---|
Use Scenario: Digital multimeters and process controllers displaying real-time voltage, current, or temperature readings with 4-digit numeric and status icons. IC Role / Device Role / Timing Role: Primary LCD driver managing 4-backplane, 40-segment display; generates precise multiplexed waveforms synchronized to internal 200 kHz oscillator. Use Value: Enables full 160-element display using single IC; eliminates need for external bias circuitry and reduces BOM count by ≥5 passive components per unit. |
Use Scenario: Microwave ovens and washing machines showing time, cycle progress, and error codes via segmented LCD with backlight control. IC Role / Device Role / Timing Role: Standalone display controller interfacing to MCU over I²C; handles blinking segments (e.g., colon, "SEC") via dedicated hardware blinker. Use Value: Reduces MCU firmware overhead by offloading display RAM management and auto-incremented writes; supports power-saving mode for standby battery operation. |
| Portable Medical Devices | Telecom Handsets |
Use Scenario: Blood glucose meters and pulse oximeters requiring ultra-low-power, readable monochrome LCDs in compact enclosures. IC Role / Device Role / Timing Role: Low-voltage LCD driver operating from 2.0 V VDD; supplies regulated VLCD bias and manages 1:4 multiplex timing to maximize contrast at minimal supply current. Use Value: Achieves <10 µA quiescent current in power-saving mode; supports direct drive of low-threshold LCDs without level-shifting or boost converters. |
Use Scenario: Legacy cordless telephones and VoIP desk phones displaying caller ID, signal strength, and menu navigation on small alphanumeric LCDs. IC Role / Device Role / Timing Role: Cascadable I²C peripheral enabling multi-line displays (e.g., 2×16 characters) using two PCF8576CH/1,157 devices sharing one bus. Use Value: Hardware subaddressing (A0–A2) allows daisy-chained configuration without address jumpers; simplifies PCB layout and firmware initialization sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8576CT/1,518 | VSO56 package (56-pin), smaller footprint (7.2 × 4.4 mm), thinner profile (1.2 mm); identical electrical specs and register map. | Better suited for space-constrained handhelds; requires different land pattern and reflow profile vs. LQFP64. | Select when board area is limited and thermal dissipation requirements permit smaller package. |
| PCF8576CU/2/F2,026 | Bare die (56-bump WLCSP), 3.2 × 2.92 mm; no package parasitics; requires custom COB or laminate assembly. | Targeted at ultra-compact modules (e.g., smart card readers); no leadframe inductance, faster edge rates possible. | Select for volume production where die-level integration and minimal form factor outweigh assembly complexity. |
Compared with PCF8576CH/1,157, the PCF8576CT/1,518 offers identical functionality in a smaller VSO56 package ideal for portable designs, while the PCF8576CU/2/F2,026 provides bare-die integration for space-critical embedded modules - neither is pin-compatible, but all share identical I²C command set and RAM structure.
Availability
PCF8576CH/1,157 is available at Aetrix Electronics and suitable for industrial panel meters, consumer appliance UIs, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PCF8576CH/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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal interface and display technologies.
The PCF8576C family was designed specifically for cost-sensitive, low-power LCD applications in consumer and industrial equipment - emphasizing integration (bias gen, RAM, I²C), flexibility (multiplex/configurable bias), and ease of cascade deployment.
FAQ
What LCD configurations does the PCF8576CH/1,157 support?
The PCF8576CH/1,157 supports static (1:1), 1:2, 1:3, and 1:4 multiplexed LCDs with up to 4 backplanes and 40 segments. It can drive 20×7-segment digits, 10×14-segment characters, or any 160-element graphics layout. Configuration is set via mode-set commands and hardware bias selection; the PCF8576CH/1,157 automatically adapts display RAM addressing and waveform generation to match.
How does the PCF8576CH/1,157 handle I²C communication in cascaded systems?
The PCF8576CH/1,157 uses hardware subaddressing (pins A0–A2) and a programmable subaddress counter to filter I²C traffic - only data matching the configured 3-bit subaddress is written to its display RAM. In cascade, SYNC pin synchronizes frame timing across devices, while SDA/SCL remain shared; each PCF8576CH/1,157 responds only to its assigned subaddress.
What is the role of the OSC pin on the PCF8576CH/1,157?
The OSC pin on the PCF8576CH/1,157 selects clock source: tied to VSS enables the internal oscillator (output appears on CLK pin); tied to VDD disables it and configures CLK as external clock input. This choice affects power mode, frame frequency derivation, and system timing architecture - removing clock input freezes the LCD in unsafe DC bias.
Can unused segment or backplane outputs on the PCF8576CH/1,157 be left unconnected?
Yes - unused segment outputs (S0–S39) and backplane outputs (BP0–BP3) on the PCF8576CH/1,157 must be left open-circuit per datasheet. In 1:2 mode, BP0/BP2 and BP1/BP3 may be paralleled to increase drive strength; in 1:3 mode, BP3 mirrors BP1 and can be tied; in static mode, all four BP outputs carry identical signals and may be wired in parallel for higher current capability.
Does the PCF8576CH/1,157 require external components for basic LCD operation?
No - the PCF8576CH/1,157 requires only VDD, VSS, VLCD, and the LCD panel for full operation. Its integrated LCD bias generator, 40×4-bit display RAM, and I²C interface eliminate need for external resistors, capacitors, or oscillators. Even in cascaded configurations, no additional components are needed beyond standard I²C pull-ups.
PCF8576CH/1,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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)
PCF8576CH/1,157 FAQ
1.How can I place an order for PCF8576CH/1,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8576CH/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 PCF8576CH/1,157 reliable?
The price and inventory of PCF8576CH/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 PCF8576CH/1,157 is usually 5 days.
3.What payment methods are accepted for PCF8576CH/1,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8576CH/1,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8576CH/1,157?
PCF8576CH/1,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8576CH/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 PCF8576CH/1,157?
For technical support, including PCF8576CH/1,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8576CH/1,157 requirements.
6.How does Aetrix verify that PCF8576CH/1,157 is sourced from the original manufacturer or authorized distributors?
All PCF8576CH/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 PCF8576CH/1,157 meets industry standards.
7.What is the process for return or replacement of PCF8576CH/1,157?
All PCF8576CH/1,157 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8576CH/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 PCF8576CH/1,157 part is unused and in its original packaging.
Return procedure for PCF8576CH/1,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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