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NXP Semiconductors PCF8577CT/3,118
- Part No.:
- PCF8577CT/3,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 40-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
PCF8577CT/3,118.pdf
- Description:
- IC DRVR 32 SEGMENT 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,123
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Product details
Overview
PCF8577CT/3,118 from NXP Semiconductors is an I²C-bus LCD segment driver supporting direct drive (32 segments) or duplex drive (64 segments), operating from 2.5 V to 6 V supply, with built-in single-pin oscillator and hardware subaddressing (A0/A1/A2). It serves as a remote display interface IC in battery-powered instrumentation and industrial control panels requiring low-power, minimal-wiring LCD backplanes.
For engineers reviewing the PCF8577CT/3,118 datasheet, PCF8577CT/3,118 pinout, PCF8577CT/3,118 application, or PCF8577CT/3,118 equivalent, key selection criteria include I²C slave address (0x74), segment drive capability per mode, oscillator component requirements (ROSC/COSC), and BP1/BP2 signal routing in duplex configuration.
Technical Context
The PCF8577CT/3,118 implements a segmented LCD driver architecture with dual-bank register memory (BANK A/B), auto-incremented SBV addressing across up to eight cascaded devices, and hardware-controlled MODE/BANK bits for drive-mode and display-data selection. Its I²C interface supports standard-mode (100 kHz) operation with ACK-based protocol and subaddress boundary rollover.
It features a shared A0/OSC pin for oscillator configuration or hardware address input, A2/BP2 dual-function pin enabling either subaddressing (direct mode) or second backplane output (duplex mode), and ESD-protected SCL/SDA pins without VDD-connected diodes to support partial VDD shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Slave Address | 0x74 (binary 01110100); fixed address enables multi-device bus without software address reconfiguration |
| Segment Drive Capacity | 32 segments in direct mode; 64 segments in duplex mode using BP1 + BP2 backplanes |
| Supply Voltage Range | 2.5 V to 6 V; supports single-cell Li-ion, 3.3 V, and 5 V systems without level-shifting |
| Display Frequency | 65–120 Hz (typ. 90 Hz); set by external ROSC/COSC on A0/OSC pin |
| Operating Temperature | −40 °C to +85 °C; qualified for industrial ambient environments |
| Power Consumption | 25–125 µA (typ. at 5 V, 100 kHz SCL); ultra-low quiescent current enables long-life battery operation |
| Pin Count & Package | 40-pin VSO40 (SOT158-1); very small outline package optimized for compact PCB layouts |
Pinout & Package
PCF8577CT/3,118 is housed in a plastic very small outline package (VSO40, SOT158-1) with 40 leads, designed for surface-mount assembly and single-plane PCB routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S1–S32 | Segment outputs | Drive individual LCD segments; each pin sources/sinks AC waveform synchronized to BP1/BP2 |
| BP1 | Backplane output / cascade sync input | Primary backplane signal in direct mode; sync input when cascading multiple PCF8577Cs |
| A2/BP2 | Hardware subaddress input / secondary backplane output | In direct mode: A2 address bit; in duplex mode: dedicated BP2 output for 64-segment drive |
| VDD | Positive supply | 2.5–6 V logic and LCD driver supply; powers internal registers, oscillator, and output drivers |
| A1 | Hardware subaddress input | Defines device address bit (A1); tied to VSS or VDD to select one of four subaddresses |
| A0/OSC | Oscillator input / hardware subaddress input | Connect external R/C for LCD modulation clock; or tie to VDD/VSS for A0 address bit |
| VSS | Ground supply | Reference for all logic, analog, and LCD outputs; must be common with VLCD return path |
| SCL | I²C clock input | Standard-mode (≤100 kHz) clock line; open-drain with external pull-up required |
| SDA | I²C data I/O | Open-drain bidirectional data line; requires external pull-up and ACK timing compliance |
Key Features
| Feature | Design Value |
|---|---|
| Direct/duplex drive mode selection | Configurable via MODE bit in control register; enables 32-segment (low pin count) or 64-segment (high-density) LCDs without hardware change |
| Auto-incremented loading across devices | SBV increments across contiguous subaddresses, allowing seamless data writes to multi-IC segment banks without host address management |
| Display memory switching (BANK A/B) | BANK bit toggles between two independent 32-byte segment data sets, enabling flicker-free page updates or dual-screen content |
| Single-pin oscillator with external R/C | Eliminates need for crystal or external clock source; ROSC = 1 MΩ and COSC = 680 pF yield ~90 Hz display frequency |
| I²C-bus output expander capability | Can drive 32 general-purpose outputs (S1–S32) in static mode-no LCD required-extending microcontroller GPIO count over I²C |
Applications
| Industrial Control Panel | Portable Medical Instrument |
|---|---|
|
Use Scenario: Front-panel LCD display on programmable logic controller (PLC) HMI with 24-segment status indicators and 8-digit numeric readout. IC Role / Device Role / Timing Role: Primary segment driver managing all 32 segments via I²C from ARM Cortex-M host; provides BP1 synchronization and BANK switching for real-time parameter updates. Use Value: Reduces wiring complexity vs. parallel interface; enables firmware-driven display reconfiguration without PCB redesign. |
Use Scenario: Low-power blood glucose meter with 16-segment alphanumeric display and battery voltage indicator. IC Role / Device Role / Timing Role: Direct-drive LCD controller powered from 3.3 V coin cell; uses power-on reset to blank display until firmware initializes. Use Value: Ultra-low IDD (25 µA typ.) extends battery life beyond 12 months; integrated oscillator eliminates external timing components. |
| Smart Energy Meter | Home Appliance Keypad Display |
|
Use Scenario: DIN-rail mounted electricity meter with 4-line, 16-character LCD showing kWh, tariff, and fault codes. IC Role / Device Role / Timing Role: Duplex-mode driver (64 segments) controlled by metering SoC; BP1/BP2 driven from PCF8577CT/3,118 to minimize EMI on sensitive analog front-end. Use Value: Dual-backplane architecture reduces RMS voltage stress on LCD glass, improving contrast stability over temperature range. |
Use Scenario: Microwave oven control panel with segmented icons (timer, power level, function keys) and 4-digit countdown display. IC Role / Device Role / Timing Role: I²C-expander mode driving 32 discrete LED/segment outputs; decouples display control from main MCU during cooking cycles. Use Value: Enables independent display refresh at 100 Hz while MCU handles high-priority RF and thermal monitoring tasks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8575T/3,118 | 16-bit I²C I/O expander; no LCD-specific timing, oscillator, or backplane outputs | Lacks direct LCD drive capability; requires external AC generation circuitry for segment bias | Choose only if driving LEDs or simple GPIO expansion-not for native LCD interfacing |
| MAX6955ATL+ | 16-segment + 8-digit LED/LCD driver; supports only 16 segments, not 32/64; integrated charge pump for VLCD | Lower segment count; limited to 4-mux LCDs; no duplex mode or BANK switching | Select when system requires integrated VLCD boost and smaller display size; not scalable to 64 segments |
Compared with PCF8577CT/3,118, PCF8575T/3,118 lacks LCD-specific hardware (oscillator, BP outputs, MODE control), while MAX6955ATL+ offers fewer segments and no auto-incremented multi-device loading-making PCF8577CT/3,118 uniquely suited for scalable, low-power, I²C-connected LCDs up to 256 segments.
Availability
PCF8577CT/3,118 is available at Aetrix Electronics and suitable for industrial control panels, portable medical instruments, smart energy meters, and home appliance displays requiring stable component supply and long-term lifecycle support.
Supply support for PCF8577CT/3,118 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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal interface ICs.
The PCF8577C product line was designed specifically for cost-sensitive, low-power LCD display subsystems in resource-constrained embedded systems-emphasizing I²C integration, minimal external components, and flexible drive modes.
FAQ
What is the I²C slave address of the PCF8577CT/3,118?
The PCF8577CT/3,118 has a fixed I²C slave address of 0x74 (binary 01110100). This address is hardwired and cannot be changed via software or external pins. All PCF8577CT/3,118 devices on the same bus respond to this address, with device selection handled exclusively through hardware subaddress lines A0, A1, and A2 during data loading.
How does the PCF8577CT/3,118 support 64-segment LCDs?
The PCF8577CT/3,118 supports 64 segments in duplex drive mode by using both BP1 and BP2 backplane signals. In this mode, the A2/BP2 pin functions as the second backplane output, and segment data is distributed across BANK A (BP1) and BANK B (BP2). The MODE bit in the control register must be set to logic 1 to enable duplex operation.
Can the PCF8577CT/3,118 operate without an external oscillator component?
No-the PCF8577CT/3,118 requires external ROSC and COSC connected to the A0/OSC pin to generate the LCD modulation frequency. Typical values are 1 MΩ and 680 pF for ~90 Hz operation. Leaving A0/OSC unconnected or tying it directly to VDD/VSS disables oscillator functionality and prevents proper LCD drive waveform generation.
What happens to the display during power-on reset of the PCF8577CT/3,118?
During power-on reset, the PCF8577CT/3,118 blanks the display by setting all segment outputs (S1–S32) and backplane outputs (BP1, A2/BP2) to VSS, clearing all segment byte registers and the control register, and initializing the I²C-bus interface. This ensures a known, non-flickering state before firmware loads display data.
Is the PCF8577CT/3,118 suitable for use as a general-purpose I²C I/O expander?
Yes-the PCF8577CT/3,118 can function as a 32-bit I²C output expander by configuring it in direct drive mode with static segment outputs. In this mode, S1–S32 behave as open-drain-compatible outputs (with appropriate external pull-ups), enabling GPIO extension without requiring LCD-specific timing or backplane signals.
PCF8577CT/3,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 40-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- 32 Segment
- Interface:
- I2C
- Digits or Characters:
- -
- Current - Supply:
- -
- Voltage - Supply:
- 2.5V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSO
PCF8577CT/3,118 FAQ
1.How can I place an order for PCF8577CT/3,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8577CT/3,118 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 PCF8577CT/3,118 reliable?
The price and inventory of PCF8577CT/3,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8577CT/3,118 is usually 5 days.
3.What payment methods are accepted for PCF8577CT/3,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8577CT/3,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8577CT/3,118?
PCF8577CT/3,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8577CT/3,118 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 PCF8577CT/3,118?
For technical support, including PCF8577CT/3,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8577CT/3,118 requirements.
6.How does Aetrix verify that PCF8577CT/3,118 is sourced from the original manufacturer or authorized distributors?
All PCF8577CT/3,118 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 PCF8577CT/3,118 meets industry standards.
7.What is the process for return or replacement of PCF8577CT/3,118?
All PCF8577CT/3,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8577CT/3,118, 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 PCF8577CT/3,118 part is unused and in its original packaging.
Return procedure for PCF8577CT/3,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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