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NXP Semiconductors PCF8553DTT/AJ
- Part No.:
- PCF8553DTT/AJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCF8553DTT/AJ.pdf
- Description:
- IC DRVR 7 SEGMENT 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
PCF8553DTT/AJ from NXP Semiconductors is an ultra low-power 40 × 4 LCD segment driver IC with I²C- and SPI-bus interfaces, internal oscillator, and programmable bias generation. It delivers 4 backplane and 40 segment outputs, supports static to 1:4 multiplex drive modes, operates from 1.8 V to 5.5 V on both VLCD and VDD, and is rated for -40 °C to +85 °C - ideal for battery-powered metering and healthcare displays.
For engineers reviewing the PCF8553DTT/AJ datasheet, PCF8553DTT/AJ pinout, PCF8553DTT/AJ application, or PCF8553DTT/AJ equivalent, key selection criteria include its dual-interface flexibility (400 kHz I²C / 5 MHz SPI), independent VLCD/VDD supplies, auto-incrementing display RAM addressing, selectable blink frequencies (0.5/1/2 Hz), and support for up to 160-segment graphics or 20-digit 7-segment displays.
Technical Context
The PCF8553DTT/AJ integrates a display controller with instruction decoding, address pointer auto-increment, and register-mapped display RAM (04h–17h) organized per backplane in 1:4 multiplex mode. Its internal LCD bias generator provides 1/2 or 1/3 bias via buffered taps from VLCD–VSS, enabling precise RMS voltage control across COM/SEG outputs.
It supports hardware reset via active-low RST (≥10 µs pulse), Power-On Reset enable/disable via PORE pin, and software reset via SR[7:0] = 00101100 at address 00h. Clock source is configurable: internal oscillator (enabled/disabled via OSC bit) or external signal on CLK pin, with COE bit controlling clock output availability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Segment/Backplane Count | 40 segment drivers and 4 backplane outputs - supports up to 160-segment LCDs (e.g., 20×7-segment digits or 10×14-segment alphanumerics). |
| Interface Options | I²C bus (400 kHz max) and SPI bus (5 MHz max) - selectable via IFS pin; enables host MCU integration with minimal GPIO overhead. |
| Supply Voltage Range | VDD and VLCD each operate from 1.8 V to 5.5 V - allows single-supply systems or independent optimization of logic and LCD bias voltages. |
| Multiplex & Bias Modes | Selectable 1:1 (static), 1:2, 1:3, or 1:4 multiplex; with 1/2 or 1/3 bias - matches diverse LCD module requirements without external components. |
| Operating Temperature | -40 °C to +85 °C - qualified for industrial and consumer metering applications with extended thermal reliability. |
| Power Consumption | Ultra low-power design - minimizes battery drain in portable devices; power-down mode disables oscillator while retaining register state. |
| Blink Control | Programmable blink frequencies: 0.5 Hz, 1 Hz, or 2 Hz - implemented via Display_ctrl_2 register (BL[1:0]), with full-display blanking during off-phase. |
Pinout & Package
TSSOP56 package (SOT364-1), 6.1 mm body width, 56-pin plastic thin shrink small outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEG0–SEG39 | LCD segment output | 40 dedicated CMOS outputs driving LCD segments; pins 23–56 and 1–6 map directly to display elements in defined RAM order. |
| COM0–COM3 | LCD backplane output | 4 outputs (pins 7–10) generating multiplexed backplane waveforms; synchronized with SEG outputs per selected MUX mode. |
| VLCD | LCD supply input | Independent analog supply (pin 11) for LCD bias generation; decoupled separately from VDD to minimize noise coupling into display signals. |
| VDD / VSS | Digital supply / ground | VDD (pin 12) powers logic core; VSS (pin 14) is digital ground reference - requires local 100 nF decoupling per supply pin. |
| RST | Hardware reset input | Active-low asynchronous reset (pin 15); ≥10 µs pulse restores default registers, clears address pointer, and disables display/oscillator. |
| IFS | Interface select input | Configures bus protocol: tied to VSS for I²C, VDD for SPI (pin 13); determines SDA/CE and SDIO pin functionality. |
| SCL / SDA/CE / SDIO | I²C/SPI signal terminals | SCL (19) and SDA/CE (20) used for I²C; SDIO (16) and SCL (19) used for SPI data/clock - shared pins reduce footprint vs. dual-interface alternatives. |
| CLK | Oscillator I/O | Configurable as internal oscillator output or external clock input (pin 18); COE bit controls 3-state vs. driven output; duty cycle guaranteed 50:50. |
| PORE | POR enable input | Connect to VDD to enable internal Power-On Reset (pin 21); connect to VSS or leave open to disable - avoids need for external POR circuitry. |
| A0 / A1 | I²C address bits | Hardware-selectable device address (pins 17, 22); each tied to VSS (logic 0) or VDD (logic 1) sets unique 7-bit I²C address for multi-device buses. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD bias generator | On-chip fractional voltage divider with low-power buffers eliminates external resistors and op-amps for 1/2 or 1/3 bias generation. |
| Dual serial interface support | Single die supports both I²C (400 kHz) and SPI (5 MHz) via pin-strapped IFS - reduces BOM count and simplifies firmware reuse across platforms. |
| Auto-incrementing display RAM | Address pointer increments automatically after each write (04h → 05h → … → 17h), enabling efficient block-loading of segment data without manual address management. |
| Independent VLCD and VDD supplies | Separate analog (VLCD) and digital (VDD) rails allow optimal voltage selection: e.g., 3.3 V logic with 4.5 V LCD bias for enhanced contrast in low-temperature operation. |
| Configurable blink and inversion | BL[1:0] bits set blink frequency (0.5/1/2 Hz); INV bit selects line vs. frame inversion - ensures flicker-free, high-contrast display operation across temperature ranges. |
| Software and hardware reset | Hardware RST pin (≥10 µs) and Software_reset command (00101100 at 00h) provide flexible initialization paths - critical for field-upgradeable or watchdog-recovered systems. |
Applications
| Metering Equipment | Small Appliances |
|---|---|
|
Use Scenario: Digital electricity/water/gas meters with 4-line alphanumeric LCD readouts requiring long battery life and stable segment drive under varying temperature. IC Role / Device Role / Timing Role: Primary LCD segment driver managing all 160 segments across 4 backplanes; handles bias generation, multiplex timing, and host interface translation. Use Value: Ultra low-power operation extends 10-year battery life; 1:4 multiplex + 1/3 bias configuration ensures >1.7 discrimination ratio for reliable readability at -25 °C. |
Use Scenario: Microwave ovens, coffee makers, and induction cooktops with segmented time/temperature/status displays operating in thermally stressed environments. IC Role / Device Role / Timing Role: Dedicated display controller providing synchronized COM/SEG waveforms, blink control for timer alerts, and robust I²C communication with main MCU. Use Value: Independent VLCD/VDD supplies allow 5 V LCD bias for high-contrast segments while MCU runs at 3.3 V; -40 °C to +85 °C rating covers appliance internal temperature swings. |
| Consumer Healthcare Devices | Battery Operated Devices |
|
Use Scenario: Blood glucose monitors and digital thermometers with compact 7-segment or icon-based LCDs needing accurate, low-noise segment drive and minimal quiescent current. IC Role / Device Role / Timing Role: Standalone LCD driver handling display refresh, blinking indicators (e.g., measurement in progress), and power-down entry/exit sequencing. Use Value: BOOST bit enables enhanced drive strength for higher-capacitance medical-grade LCDs; power-down mode draws <1 µA, preserving coin-cell battery for >2 years. |
Use Scenario: Portable data loggers, handheld testers, and wireless sensors using monochrome LCDs where PCB space and component count are constrained. IC Role / Device Role / Timing Role: Integrated solution replacing discrete bias generators, shift registers, and interface logic - reduces layout complexity and EMI susceptibility. Use Value: TSSOP56 package fits dense layouts; dual I²C/SPI support allows reuse of existing MCU peripheral code; internal oscillator removes need for external crystal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8553DTT/AY | Identical electrical specs and pinout; dry-pack packaging (vs. non-dry pack for PCF8553DTT/AJ); documented drop-in replacement per PCN202102010F01. | No functional difference; preferred for moisture-sensitive assembly processes requiring dry-pack handling. | Select PCF8553DTT/AY when JEDEC-compliant dry packaging is required; otherwise PCF8553DTT/AJ remains valid for standard reflow. |
| PCF8576CT | 40 × 4 segment driver with I²C only (no SPI); wider VDD range (2.5–6.0 V); lacks BOOST bit and software reset command. | Suitable for simpler I²C-only systems but cannot support SPI-based legacy host designs or high-capacitance displays requiring enhanced drive. | Choose PCF8576CT only if SPI interface and BOOST functionality are unnecessary; verify compatibility with existing firmware register maps. |
Compared with PCF8553DTT/AY, PCF8553DTT/AJ offers identical performance with non-dry packaging - advantageous for standard SMT lines. Versus PCF8576CT, PCF8553DTT/AJ adds SPI support, BOOST capability, and software reset, making it more versatile for demanding or mixed-interface designs.
Availability
PCF8553DTT/AJ is available at Aetrix Electronics and suitable for metering equipment, small appliances, and consumer healthcare devices requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.
Supply support for PCF8553DTT/AJ 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 and display interface ICs.
The PCF8553 series was designed specifically for ultra low-power, multi-multiplex LCD segment driving in battery-operated and space-constrained embedded systems - emphasizing integration, flexibility, and thermal robustness.
FAQ
What is the primary function of the PCF8553DTT/AJ in an LCD system?
The PCF8553DTT/AJ serves as a fully integrated LCD segment driver IC, providing 40 segment and 4 backplane outputs with built-in bias generation, display RAM, and I²C/SPI interfaces. It manages waveform generation, multiplex timing, and host communication - eliminating the need for external bias networks or discrete driver logic in applications like digital meters and portable medical devices. The PCF8553DTT/AJ directly drives up to 160-segment LCDs while maintaining ultra low-power operation across -40 °C to +85 °C.
How does the PCF8553DTT/AJ handle LCD bias voltage generation?
The PCF8553DTT/AJ generates LCD bias internally using a resistor-divider network between VLCD and VSS, with buffered taps delivering precise 1/2 or 1/3 bias levels to the display. This eliminates external components and ensures stable RMS voltages across temperature. The bias mode is selected via the B bit in Display_ctrl_1 (address 02h), and the resulting discrimination ratio (e.g., 1.732 for 1:4 multiplex with 1/3 bias) is determined by VLCD, nMUX, and abias - all managed autonomously by the PCF8553DTT/AJ without host intervention.
Can the PCF8553DTT/AJ operate with different multiplex configurations?
Yes, the PCF8553DTT/AJ supports static (1:1), 1:2, 1:3, and 1:4 multiplex drive modes, configured via MUX[1:0] bits in Display_ctrl_1 (address 02h). Each mode activates the corresponding number of COM outputs (COM0 only for static; COM0–COM3 for 1:4) and adjusts internal timing and bias generation accordingly. The PCF8553DTT/AJ's register-mapped display RAM (04h–17h) reorganizes segment data per active backplane - ensuring seamless transition between configurations without firmware changes to data loading logic.
What are the reset mechanisms supported by the PCF8553DTT/AJ?
The PCF8553DTT/AJ supports three reset methods: hardware reset via active-low RST pin (≥10 µs pulse), Power-On Reset enabled by tying PORE to VDD, and software reset via writing 00101100 to register 00h. All restore default register states (1:4 multiplex, 1/3 bias, display disabled), clear the address pointer, and halt the oscillator. The PCF8553DTT/AJ retains display RAM contents during power-down mode, allowing rapid resume without reloading segment data after reset.
Is the PCF8553DTT/AJ compatible with both I²C and SPI host microcontrollers?
Yes, the PCF8553DTT/AJ is natively compatible with both I²C and SPI hosts. Interface selection is controlled by the IFS pin: tied to VSS for I²C (using SCL/SDA/CE), or VDD for SPI (using SCL/SDIO). The PCF8553DTT/AJ implements full protocol compliance - including 400 kHz I²C timing and 5 MHz SPI clock rates - and shares pins intelligently (e.g., SCL serves as clock in both modes). No external level shifters or protocol translators are needed, simplifying integration across diverse MCU platforms.
PCF8553DTT/AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- 7 Segment + DP, 14 Segment + DP + AP, Dot Matrix
- Interface:
- I2C, SPI
- Digits or Characters:
- 10 Characters, 20 Characters, 160 Elements
- Current - Supply:
- 1.2 µA
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
PCF8553DTT/AJ FAQ
1.How can I place an order for PCF8553DTT/AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8553DTT/AJ 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 PCF8553DTT/AJ reliable?
The price and inventory of PCF8553DTT/AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8553DTT/AJ is usually 5 days.
3.What payment methods are accepted for PCF8553DTT/AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8553DTT/AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8553DTT/AJ?
PCF8553DTT/AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8553DTT/AJ 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 PCF8553DTT/AJ?
For technical support, including PCF8553DTT/AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8553DTT/AJ requirements.
6.How does Aetrix verify that PCF8553DTT/AJ is sourced from the original manufacturer or authorized distributors?
All PCF8553DTT/AJ 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 PCF8553DTT/AJ meets industry standards.
7.What is the process for return or replacement of PCF8553DTT/AJ?
All PCF8553DTT/AJ units undergo pre-shipment inspection (PSI). If there is an issue with PCF8553DTT/AJ, 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 PCF8553DTT/AJ part is unused and in its original packaging.
Return procedure for PCF8553DTT/AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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