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NXP Semiconductors PCF8545ATT/AJ
- Part No.:
- PCF8545ATT/AJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCF8545ATT/AJ.pdf
- Description:
- IC DRVR 320 SEGMENT 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,203
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Product details
Overview
PCF8545ATT/AJ from NXP Semiconductors is an I²C-interface universal LCD controller/driver IC supporting up to 1:8 multiplexing, 320-segment drive capability, 4–8 backplane configuration, programmable 60–300 Hz frame frequency (factory-calibrated), and dual supply operation (1.8–5.5 V logic / 2.5–5.5 V LCD). It serves as the primary display interface in industrial panel meters and consumer appliance front panels.
For engineers reviewing the PCF8545ATT/AJ datasheet, PCF8545ATT/AJ pinout, PCF8545ATT/AJ application, or PCF8545ATT/AJ equivalent, this page delivers verified technical context, TSSOP56 package mapping, I²C bus timing constraints, bias/mux configuration options, and validated drop-in alternatives per NXP's PCN202102010F01.
Technical Context
The PCF8545ATT/AJ implements a dedicated LCD waveform generator synchronized to either its internal 230 kHz oscillator or an external 9.6 kHz/230 kHz clock applied to OSCCLK. Its display RAM auto-increments during I²C write bursts, minimizing microcontroller overhead for full-screen updates.
It supports three multiplex modes (1:4, 1:6, 1:8) and three bias configurations (1/2, 1/3, 1/4) via command registers, with backplane swapping (BPS bit) enabling flexible PCB routing. Frame frequency is set via 5-bit FD[4:0] register (32 steps), with default 199.7 Hz at q=24 for 230 kHz clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Interface | 400 kHz max clock rate; uses A0 pin for slave address selection (0x70 or 0x71) |
| LCD Drive Capacity | Up to 320 segments with 4–8 backplanes; enables 40×7-seg or 20×14-seg alphanumeric displays |
| Frame Frequency Range | 60–300 Hz in 10 Hz steps; factory-trimmed internal oscillator ensures ±3% accuracy at 200 Hz |
| Supply Voltages | VDD = 1.8–5.5 V; VLCD = 2.5–5.5 V; independent supplies allow optimized contrast and logic compatibility |
| Operating Temperature | −40 °C to +85 °C; qualified for industrial-grade embedded applications |
| Power-Down Mode | PD bit disables internal oscillator and forces all BP/S outputs to VSS; reduces current to <1 µA |
| Reset Behavior | Active-low RESET pin clears registers to defaults (1:8 mux, 1/4 bias, display disabled) but preserves RAM content |
Pinout & Package
TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–11, 20–31, 48–56 (S0–S39, S19, S20–S31) | LCD segment output | Drives individual LCD segments; pin mapping varies with BPS bit setting for routing flexibility |
| 12–19, 32–39 (BP0–BP7 / S32–S39) | LCD backplane output | Configurable as backplanes or segments depending on BPS; supports 4/6/8-backplane LCDs |
| 43 | RESET | Asynchronous active-low reset; initializes registers (not RAM) to power-on defaults in 1 ms |
| 44 | VSS | Ground reference for logic and LCD circuitry; must be tied to system ground |
| 45 | VDD | Digital supply input (1.8–5.5 V); powers internal logic, I²C interface, and RAM |
| 46 | OSCCLK | Configurable as internal oscillator output (230 kHz) or external clock input (9.6/230 kHz) |
| 47 | VLCD | Independent LCD bias supply (2.5–5.5 V); must be ≥ VDD to ensure proper contrast control |
| 40 | A0 | I²C slave address LSB; selects between 0x70 (A0 = low) and 0x71 (A0 = high) |
| 41 | SCL | I²C serial clock input; requires external pull-up; 400 kHz max frequency |
| 42 | SDA | I²C bidirectional data line; open-drain, requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Auto-incremented display RAM | 320-bit RAM allows burst writes without manual address updates-reduces I²C transaction count by >60% for full-screen refresh |
| Selectable inversion mode | Line inversion (INV=0) or frame inversion (INV=1); frame mode cuts dynamic power by ~35% but risks flicker above 100 Hz |
| Backplane swap (BPS) | BPS bit reassigns BP/S pins between sides of package-enables single-layer PCB routing without vias or jumpers |
| OTP-refresh calibration | One-time programmable cells store oscillator trim values; OTP-refresh command (after reset) loads factory calibration for frame frequency accuracy |
| Independent supply domains | VDD and VLCD separation allows optimizing logic noise immunity (low VDD) and display contrast (high VLCD) simultaneously |
Applications
| Industrial Panel Meter | Home Appliance Control Panel |
|---|---|
Use Scenario: Digital multimeter displaying voltage, current, and resistance readings with 4-digit numeric and unit symbols. IC Role / Device Role / Timing Role: Primary LCD controller generating multiplexed waveforms for 320-element segmented display; manages bias, frame timing, and RAM updates via I²C from MCU. Use Value: Enables compact, low-power display with factory-calibrated 200 Hz frame rate-eliminates need for external timing components and reduces firmware overhead. |
Use Scenario: Microwave oven front panel showing time, power level, and cooking mode using 14-segment alphanumeric characters. IC Role / Device Role / Timing Role: Dedicated display driver handling 20×14-seg layout; configured for 1:8 multiplex and 1/4 bias to maximize contrast across temperature range. Use Value: Independent VLCD supply allows stable contrast at varying ambient temperatures; BPS bit simplifies 2-layer PCB layout for cost-sensitive consumer design. |
| Portable Test Equipment | Building Automation Thermostat |
Use Scenario: Handheld insulation tester with graphical battery indicator, measurement status icons, and numeric readout. IC Role / Device Role / Timing Role: Graphics-capable LCD driver rendering custom symbols and digits; uses frame-frequency command to adjust refresh for battery life vs. flicker trade-off. Use Value: Programmable 60–300 Hz frame rate lets firmware dynamically lower refresh to 60 Hz during standby-extending battery life by 2.3× versus fixed 200 Hz. |
Use Scenario: Wall-mounted HVAC controller displaying temperature setpoint, current room temp, fan speed, and mode icons. IC Role / Device Role / Timing Role: Low-power display interface operating from 3.3 V logic supply while driving 5 V LCD; leverages PD bit for deep-sleep between UI updates. Use Value: Power-down mode draws <1 µA-critical for battery-backed thermostats requiring >1-year operation on CR2032 cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD controller/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8545ATT/AY | Identical functionality and pinout; dry-pack packaging replaces non-dry-pack of /AJ variant per PCN202102010F01 | Same industrial temperature range (−40 °C to +85 °C); preferred for moisture-sensitive assembly processes | Select /AY for new designs requiring JEDEC-compliant dry pack; /AJ remains viable for existing non-dry-pack production lines |
| PCF8576CT | Higher segment count (528), SPI-only interface, no I²C support; different pinout and command set | Targeted at larger displays (e.g., 66×8 dot matrix); requires SPI host and PCB redesign due to incompatible footprint | Choose only if >320 segments needed and SPI interface is acceptable; not a drop-in replacement for PCF8545ATT/AJ |
Compared with PCF8545ATT/AJ, PCF8545ATT/AY offers identical electrical and functional behavior with improved moisture protection, while PCF8576CT provides greater segment capacity at the cost of interface and layout incompatibility-making /AY the direct continuity path and PCF8576CT a functional alternative only for scaled-up display requirements.
Availability
PCF8545ATT/AJ is available at Aetrix Electronics and suitable for industrial panel meters, home appliance control panels, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCF8545ATT/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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with over 30 years of leadership in interface and display ICs.
The PCF8545 belongs to NXP's legacy LCD controller family designed for cost-sensitive, low-power embedded displays requiring flexible multiplexing and robust industrial qualification-targeting applications where reliability and long-term supply stability outweigh cutting-edge feature sets.
FAQ
What interface protocol does the PCF8545ATT/AJ use?
The PCF8545ATT/AJ uses a standard 400 kHz I²C-bus interface with two-wire bidirectional communication (SCL and SDA), plus an address-select pin (A0) for dual-device addressing. It does not support SPI-only the PCF8545BTT variant does. The I²C implementation complies with Philips I²C specification v2.1 and requires external pull-up resistors on both lines.
How many LCD segments can the PCF8545ATT/AJ drive?
The PCF8545ATT/AJ drives up to 320 LCD segments when configured for 1:8 multiplexing with eight backplanes. This supports configurations such as 40 seven-segment characters, 20 fourteen-segment alphanumeric characters, or arbitrary graphics layouts totaling ≤320 elements. Segment count scales down to 240 (1:6) or 160 (1:4) when fewer backplanes are used.
What is the purpose of the OTP-refresh command in the PCF8545ATT/AJ?
The OTP-refresh command reloads factory-trimmed oscillator calibration data from one-time-programmable memory into the PCF8545ATT/AJ's timing circuitry. It must be issued after every hardware reset or power-on before enabling the display to ensure frame frequency accuracy within ±3%. Skipping OTP-refresh results in uncalibrated frame rates that may deviate by up to ±15%.
Can the PCF8545ATT/AJ operate with separate logic and LCD supply voltages?
Yes-the PCF8545ATT/AJ supports independent VDD (1.8–5.5 V) and VLCD (2.5–5.5 V) supplies. VLCD must be ≥ VDD to maintain proper bias generation. This separation allows optimizing logic noise immunity (e.g., 3.3 V VDD) while maximizing display contrast (e.g., 5.0 V VLCD), a key advantage in mixed-signal industrial systems.
Is the PCF8545ATT/AJ pin-compatible with other variants in the PCF8545 family?
The PCF8545ATT/AJ is pin-compatible with PCF8545ATT/AY and PCF8545ATT/A, sharing identical TSSOP56 pinout and electrical behavior. It is not pin-compatible with PCF8545BTT (SPI variant), which substitutes CE and SDI for A0 and SDA. Pin compatibility is confirmed in NXP's ordering information tables and mechanical drawings (SOT364-1).
PCF8545ATT/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:
- 320 Segment
- Interface:
- I2C
- Digits or Characters:
- -
- Current - Supply:
- 30 µA
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 95°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
PCF8545ATT/AJ FAQ
1.How can I place an order for PCF8545ATT/AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8545ATT/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 PCF8545ATT/AJ reliable?
The price and inventory of PCF8545ATT/AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8545ATT/AJ is usually 5 days.
3.What payment methods are accepted for PCF8545ATT/AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8545ATT/AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8545ATT/AJ?
PCF8545ATT/AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8545ATT/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 PCF8545ATT/AJ?
For technical support, including PCF8545ATT/AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8545ATT/AJ requirements.
6.How does Aetrix verify that PCF8545ATT/AJ is sourced from the original manufacturer or authorized distributors?
All PCF8545ATT/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 PCF8545ATT/AJ meets industry standards.
7.What is the process for return or replacement of PCF8545ATT/AJ?
All PCF8545ATT/AJ units undergo pre-shipment inspection (PSI). If there is an issue with PCF8545ATT/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 PCF8545ATT/AJ part is unused and in its original packaging.
Return procedure for PCF8545ATT/AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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