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NXP Semiconductors PCF8577CT/3,112
- Part No.:
- PCF8577CT/3,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 40-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
PCF8577CT/3,112.pdf
- Description:
- IC DRVR 32 SEGMENT 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,665
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Product details
Overview
PCF8577CT/3,112 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 targets low-power remote display systems in industrial control panels and portable instrumentation.
For engineers reviewing the PCF8577CT/3,112 datasheet, PCF8577CT/3,112 pinout, PCF8577CT/3,112 application, or PCF8577CT/3,112 equivalent, key selection criteria include I²C address (0x74), segment drive capability per mode, oscillator configuration via A0/OSC, power-on reset behavior, and compatibility with cascaded multi-device LCD systems up to 256 segments.
Technical Context
The PCF8577CT/3,112 implements a dual-bank register architecture (BANK A/B) with an 8-bit control register containing MODE (direct/duplex) and BANK select bits. Segment data loading uses auto-incremented Segment Byte Vector (SBV) addressing, enabling cross-device boundary writes when hardware subaddresses are contiguous.
In direct drive mode, SBV increments by two per byte load and BP1 serves as sole backplane; in duplex mode, SBV increments by one, BP2 is active, and A2/BP2 is repurposed as backplane output while A2 input is undefined. The I²C interface operates at ≤100 kHz with standard-mode timing compliance and supports slave address 0x74 (R/W bit = 0).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Slave Address | 0x74 (binary 01110100); fixed for all devices, enables parallel addressing on shared bus |
| Segment Drive Capability | 32 segments in direct mode; 64 segments in duplex mode - determines maximum display resolution per IC |
| Supply Voltage Range | 2.5 V to 6 V - supports battery-powered and mixed-voltage embedded systems |
| Oscillator Configuration | Single-pin A0/OSC with external R/C network (e.g., 1 MΩ + 680 pF) sets LCD frame rate (65–120 Hz) |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient conditions |
| Power Consumption | Typ. 25 µA at 5 V, 0 Hz SCL - enables ultra-low-power display standby operation |
| Display Memory | 8 × 1-byte segment registers (2 banks × 4 bytes); BANK bit selects active display bank without reloading data |
Pinout & Package
PCF8577CT/3,112 is housed in a plastic very small outline package (VSO40) with 40 leads (SOT158-1), optimized for compact PCB layout and single-plane wiring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S1–S32 | Segment outputs | Drive individual LCD segments; logic state controls AC waveform polarity relative to backplane(s) |
| BP1 | Backplane output / cascade sync input | Primary backplane signal in direct mode; synchronizes cascaded devices in master/cascade configurations |
| A2/BP2 | Hardware subaddress input / backplane output | Configures device subaddress in direct mode; becomes BP2 output in duplex mode (A2 undefined) |
| VDD | Supply voltage | 2.5–6 V main power rail; powers internal logic and segment drivers |
| A1 | Hardware subaddress input | Defines second bit of 3-bit subaddress (A2/A1/A0); must be tied to VSS or VDD for deterministic selection |
| A0/OSC | Subaddress input / oscillator pin | Third subaddress bit in direct mode; connects to external R/C network to generate LCD modulation clock |
| VSS | Ground supply | Reference for all analog and digital circuitry; required for oscillator start-up stability |
| SCL | I²C clock input | Accepts standard-mode I²C clock up to 100 kHz; synchronous interface for command/data transfer |
| SDA | I²C data I/O | Open-drain bidirectional line; requires external pull-up; carries control byte and segment register data |
Key Features
| Feature | Design Value |
|---|---|
| Direct/duplex drive modes | Configurable via MODE bit: direct mode supports 32-segment displays with bank-swappable content; duplex mode doubles segment count to 64 using dual backplanes |
| Auto-incremented loading | SBV increments automatically after each segment byte write, enabling efficient burst loading across multiple registers or cascaded devices |
| Display memory switching | BANK bit toggles between two independent 4-byte banks (A/B) without reloading segment data - enables flicker-free display updates |
| I²C-bus output expander use | When configured in direct mode with BP1 grounded and A0/OSC tied to VDD/VSS, functions as 32-bit general-purpose I²C output expander |
| Power-on reset | Clears all registers, sets segment outputs to VSS, and initializes I²C interface - ensures known display blank state at startup |
Applications
| Industrial Control Panel Display | Portable Medical Instrument LCD |
|---|---|
Use Scenario: 32-segment alphanumeric display in DIN-rail mounted PLC HMI with limited board space and battery backup. IC Role / Device Role / Timing Role: Direct-drive LCD controller managing static segment states via I²C; uses BANK switching for dual-screen content without MCU intervention. Use Value: Reduces MCU GPIO usage and firmware overhead; low 25 µA typical supply current extends battery life in maintenance-free deployments. |
Use Scenario: Compact handheld pulse oximeter requiring reliable 64-segment duplex LCD for real-time SpO₂ and pulse waveform visualization. IC Role / Device Role / Timing Role: Duplex-mode driver generating synchronized AC waveforms across BP1/BP2; oscillator set to 90 Hz for optimal LCD contrast and minimal flicker. Use Value: Eliminates need for external timing IC; integrated backplane generation ensures phase coherence across all segments in critical medical displays. |
| Smart Energy Meter Interface | Automotive Cabin Climate Display |
Use Scenario: Multi-device LCD system (8× PCF8577CT/3,112) driving 256-segment energy consumption dashboard in utility-grade meter. IC Role / Device Role / Timing Role: Cascaded slave in I²C network; BP1/BP2 signals daisy-chained for global synchronization; subaddressing enables selective register updates. Use Value: Enables scalable, modular display architecture with single I²C bus - simplifies BOM and reduces interconnect complexity versus discrete driver solutions. |
Use Scenario: Automotive HVAC control panel with segmented LCD showing temperature, fan speed, and mode icons under wide-temperature (-40°C to +85°C) operation. IC Role / Device Role / Timing Role: Direct-drive segment controller interfacing with automotive-grade microcontroller; power-on reset guarantees blank display during cold crank. Use Value: Qualified for extended temperature range and ESD robustness (±2 kV HBM); eliminates display artifacts caused by mismatched VLCD/VDD sequencing. |
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 drive circuitry or oscillator); lacks BP1/BP2, segment mapping, and display memory banks | Suitable only for general-purpose GPIO expansion - cannot drive LCD segments directly or generate required AC waveforms | Select PCF8577CT/3,112 when LCD segment driving with built-in timing and backplane control is required; PCF8575T/3,118 only if pure digital I/O extension is needed |
| MAX6955ATL+ | 16-segment LED driver with I²C interface; includes brightness control, scan limiting, and error detection - no LCD support or backplane outputs | Designed exclusively for multiplexed LED displays; incompatible with LCD voltage requirements and AC biasing needs | Choose PCF8577CT/3,112 for low-power reflective LCDs in industrial/portable equipment; MAX6955ATL+ only for LED-based status indicators or numeric displays |
Compared with PCF8575T/3,118 and MAX6955ATL+, the PCF8577CT/3,112 uniquely integrates LCD-specific functions - including dual backplane generation, programmable frame rate oscillator, and bank-switchable display memory - making it irreplaceable for segment-based LCD applications requiring AC drive compliance and low quiescent current.
Availability
PCF8577CT/3,112 is available at Aetrix Electronics and suitable for industrial control panels, portable medical instruments, smart energy meters, and automotive cabin displays requiring stable component supply and long-term lifecycle support.
Supply support for PCF8577CT/3,112 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in interface, power management, and display technologies.
The PCF8577C product line was designed specifically for cost-effective, low-power LCD segment driving in resource-constrained embedded systems, emphasizing I²C simplicity, cascading scalability, and robust operation across industrial temperature ranges.
FAQ
What is the I²C slave address of the PCF8577CT/3,112?
The PCF8577CT/3,112 has a fixed 7-bit I²C slave address of 0x74 (binary 01110100). This address is hardwired and identical across all PCF8577C variants, enabling parallel addressing on a shared I²C bus. The R/W bit is appended externally during communication, so the full address byte sent by the master is 0xE8 (write) or 0xE9 (read). No external address pins modify this value.
How does the PCF8577CT/3,112 support duplex LCD drive mode?
The PCF8577CT/3,112 enters duplex mode when the MODE bit in its control register is set to logic 1. In this mode, it drives 64 segments using two backplanes (BP1 and BP2), with odd-numbered segment registers mapped to BP2 and even-numbered to BP1. Pin A2/BP2 becomes the BP2 output, and A2 subaddress functionality is disabled - device selection relies solely on A0 and A1.
Can the PCF8577CT/3,112 be used as a general-purpose I²C I/O expander?
Yes - when configured in direct drive mode with BP1 tied to VSS and A0/OSC connected to VDD or VSS (disabling oscillator function), the PCF8577CT/3,112 acts as a 32-bit output expander. Its S1–S32 pins become controllable digital outputs, and the I²C interface loads data into segment registers as general-purpose latch states, as shown in Figure 15 of the datasheet.
What external components are required for the PCF8577CT/3,112 oscillator?
The PCF8577CT/3,112 requires an external resistor and capacitor connected to the A0/OSC pin to configure its built-in oscillator. A typical network uses 1 MΩ resistor and 680 pF capacitor, yielding a display frequency of 65–120 Hz. Both components must share the same VDD/VSS rails as the IC to ensure reliable oscillator start-up after power-on reset.
Does the PCF8577CT/3,112 support cascading with other PCF8577C devices?
Yes - the PCF8577CT/3,112 supports hardware cascading via BP1 and A2/BP2 pins. In master mode, BP1 drives the backplane and synchronizes downstream devices; in cascade mode, BP1 accepts sync input while A2/BP2 provides secondary sync. Up to eight devices can be cascaded to drive 256 segments, with subaddressing (A0/A1/A2) enabling selective register access.
PCF8577CT/3,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 40-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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/3,112 FAQ
1.How can I place an order for PCF8577CT/3,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8577CT/3,112 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 PCF8577CT/3,112 reliable?
The price and inventory of PCF8577CT/3,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8577CT/3,112 is usually 5 days.
3.What payment methods are accepted for PCF8577CT/3,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8577CT/3,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8577CT/3,112?
PCF8577CT/3,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8577CT/3,112 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 PCF8577CT/3,112?
For technical support, including PCF8577CT/3,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8577CT/3,112 requirements.
6.How does Aetrix verify that PCF8577CT/3,112 is sourced from the original manufacturer or authorized distributors?
All PCF8577CT/3,112 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 PCF8577CT/3,112 meets industry standards.
7.What is the process for return or replacement of PCF8577CT/3,112?
All PCF8577CT/3,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8577CT/3,112, 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 PCF8577CT/3,112 part is unused and in its original packaging.
Return procedure for PCF8577CT/3,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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