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NXP Semiconductors PCF8545BTT/AJ
- Part No.:
- PCF8545BTT/AJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCF8545BTT/AJ.pdf
- Description:
- IC DRVR 320 SEGMENT 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,279
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Product details
Overview
PCF8545BTT/AJ from NXP Semiconductors is a SPI-interface universal LCD driver IC supporting up to 1:8 multiplexing, 320-segment drive capability, 5 MHz SPI bus operation, and programmable frame frequency (60–300 Hz). It operates from 1.8 V to 5.5 V logic supply and 2.5 V to 5.5 V LCD supply, enabling direct integration into industrial panel meters and consumer appliance displays.
For engineers reviewing the PCF8545BTT/AJ datasheet, PCF8545BTT/AJ pinout, PCF8545BTT/AJ application, or PCF8545BTT/AJ equivalent, key selection considerations include its TSSOP56 package, SPI-only interface (no I²C), backplane configuration flexibility (4/6/8 BP), factory-calibrated frame frequency, and requirement for OTP-refresh after reset before display enable.
Technical Context
The PCF8545BTT/AJ implements a dedicated LCD waveform generator synchronized to either internal 230 kHz oscillator or external 9.6 kHz / 230 kHz clock via OSCCLK pin. Its display RAM (320-bit) supports auto-incremented addressing for efficient microcontroller write operations over SPI.
Control is executed via nine discrete command codes-including mode-settings (BPS/INV/PD/E), set-MUX-mode (1:4/1:6/1:8), set-bias-mode (1/2, 1/3, 1/4), and frame-frequency (5-bit prescaler)-all communicated through CE-controlled SPI transfers with no address byte overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | SPI-bus only (CE, SCL, SDI); no I²C support - requires dedicated chip-select timing and serial clock coordination |
| Max Segments | 320 segments - supports up to 40×7-segment digits or full-graphic 320-element displays without external segment expansion |
| Multiplex Rate | Configurable 1:4, 1:6, or 1:8 - selects number of backplanes (4/6/8) and determines maximum display complexity and bias requirements |
| Frame Frequency | 60 Hz to 300 Hz in 10 Hz steps - factory-calibrated; avoids flicker while maintaining low power in battery-operated devices |
| Supply Range | VDD = 1.8 V to 5.5 V; VLCD = 2.5 V to 5.5 V - enables independent voltage scaling for logic and LCD bias optimization |
| Operating Temp | −40 °C to +85 °C - qualified for industrial environments including HVAC controls and instrumentation panels |
| Package | TSSOP56 (SOT364-1), 6.1 mm body width - surface-mount compatible with standard reflow profiles and automated assembly |
Pinout & Package
PCF8545BTT/AJ is housed in a plastic thin shrink small outline package (TSSOP56) with 56 leads and 0.5 mm pitch. Pin functions are defined per NXP datasheet Rev. 2 (2021), with SPI-specific assignments distinguishing it from the I²C variant PCF8545ATT/AJ.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–11, 20–31, 48–56 (S0–S43) | LCD segment output | Drives individual LCD segments; pin mapping varies with backplane swap (BPS bit); total 320 segments addressable across configurations |
| 12–19, 32–39 (BP0–BP7) | LCD backplane output | Provides common backplane signals; configurable as 4/6/8 backplanes depending on M[1:0] setting; pins double as segments when BPS=1 |
| 40 | CE | SPI chip enable - active LOW; must be asserted before each command/data transfer and deasserted between transactions |
| 41 | SCL | SPI serial clock input - synchronizes all data transfers; max 5 MHz operation defines minimum MCU SPI clock setup time |
| 42 | SDI | SPI serial data input - receives command opcodes and display RAM data; no bidirectional data path (unlike I²C SDA) |
| 43 | RESET | Active LOW hardware reset - restores register defaults (E=0, PD=0, M[1:0]=00, B[1:0]=00) but preserves RAM content |
| 44 | VSS | Ground reference - must be connected directly to system ground plane; shared return for logic and LCD drive circuits |
| 45 | VDD | Digital supply - powers internal logic, SPI interface, and RAM; must be ramped simultaneously with VLCD to prevent static charge buildup |
| 46 | OSCCLK | External clock input / internal oscillator output - configured via OSC/COE bits; required for frame timing when external clock used |
| 47 | VLCD | LCD supply voltage - powers LCD bias generator; must be ≥ VDD and stable during display operation to avoid contrast shift or artifacts |
Key Features
| Feature | Design Value |
|---|---|
| 320-bit display RAM | Stores full display state locally - eliminates continuous MCU polling and reduces SPI traffic during static display updates |
| Selectable backplane count | Hardware-configurable 4/6/8 backplanes - matches diverse LCD glass designs without redesigning driver firmware or PCB layout |
| Factory-calibrated frame frequency | 60–300 Hz range with ±5 % accuracy - removes need for external crystal or trimming components in cost-sensitive applications |
| Backplane swapping (BPS) | Reassigns BP/S pin locations - simplifies PCB routing for single-layer or constrained-layout industrial front panels |
| Line/frame inversion control | INV bit selects DC compensation method - line inversion for flicker-critical displays; frame inversion for ultra-low-power modes |
| OTP-refresh command | Reloads factory calibration data after reset - ensures consistent frame timing without requiring external calibration circuitry |
Applications
| Industrial Panel Meter | Consumer Appliance Display |
|---|---|
Use Scenario: Digital multimeter or energy monitor with 4-line alphanumeric LCD showing voltage, current, power, and status icons. IC Role / Device Role / Timing Role: Primary LCD controller driving 320 segments at 1:8 multiplex; manages bias, frame timing, and RAM refresh via SPI from ARM Cortex-M0+ MCU. Use Value: Eliminates need for external bias resistors or frame-timing crystals; 1.8 V logic compatibility enables direct connection to low-voltage MCU I/O. | Use Scenario: Microwave oven or washing machine control panel with segmented numeric display and function indicators. IC Role / Device Role / Timing Role: Standalone display driver handling all segment/backplane timing and data latching; interfaces via SPI to 8-bit MCU with minimal GPIO usage. Use Value: Reduces BOM count by integrating bias generation and oscillator; OTP calibration ensures consistent contrast across production units. |
| Medical Device Status Display | Building Automation Thermostat |
Use Scenario: Portable blood pressure monitor with dual 7-segment lines and symbol indicators operating in battery-powered mode. IC Role / Device Role / Timing Role: Low-power LCD driver using frame inversion (INV=1) and power-down (PD=1) between readings to extend battery life. Use Value: Achieves <10 µA standby current with display disabled; factory-calibrated 120 Hz frame rate prevents visible flicker under clinical lighting. | Use Scenario: Wall-mounted HVAC controller with 2-row alphanumeric LCD showing temperature, mode, fan speed, and schedule status. IC Role / Device Role / Timing Role: SPI-connected peripheral managing display RAM updates and real-time contrast adjustment via VLCD regulation. Use Value: Independent VLCD/VDD supplies allow dynamic contrast tuning across ambient temperatures without affecting MCU operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8545BTT/AY | Same die, dry-pack packaging; identical electrical specs and pinout | Designed for moisture-sensitive assembly environments requiring J-STD-033 compliance | Select PCF8545BTT/AY for high-volume SMT lines with humidity-controlled storage and bake-out protocols |
| PCF8576CT | 44-segment, 4-backplane driver; I²C-only interface; no frame frequency programming | Limited to smaller displays; lacks OTP-refresh and programmable bias/frame settings | Choose only for simple 2-digit displays where cost and footprint are prioritized over configurability |
Compared with PCF8545BTT/AY, the PCF8545BTT/AJ offers identical functionality but requires non-dry-pack handling; versus PCF8576CT, the PCF8545BTT/AJ delivers 7× more segment drive capacity, SPI flexibility, and precision frame control essential for complex industrial UIs.
Availability
PCF8545BTT/AJ is available at Aetrix Electronics and suitable for industrial panel meters, consumer appliance displays, medical device status interfaces, and building automation thermostats requiring stable component supply across extended product lifecycles.
Supply support for PCF8545BTT/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 leadership in interface, power management, and display technologies.
The PCF8545 product line delivers universal, low-power LCD drivers optimized for cost-sensitive, space-constrained embedded systems requiring flexible multiplexing and factory-trimmed timing - targeting industrial HMI, white goods, and portable instrumentation.
FAQ
What interface does the PCF8545BTT/AJ support?
The PCF8545BTT/AJ supports only the SPI interface (CE, SCL, SDI), not I²C. It requires chip-enable assertion before each transaction and operates at up to 5 MHz clock rate. This distinguishes it from the PCF8545ATT/AJ, which uses I²C (SCL/SDA/A0). The PCF8545BTT/AJ's SPI-only architecture simplifies protocol stack implementation in resource-limited MCUs but mandates precise CE timing control.
Does the PCF8545BTT/AJ require an external crystal?
No, the PCF8545BTT/AJ does not require an external crystal. It includes a factory-calibrated internal 230 kHz oscillator used for frame timing, and supports optional external 9.6 kHz or 230 kHz clocks via the OSCCLK pin. The internal oscillator eliminates BOM cost and board space for timing components, and its calibration ensures frame frequency accuracy within ±5 % across temperature and voltage ranges.
How many LCD segments can the PCF8545BTT/AJ drive?
The PCF8545BTT/AJ drives up to 320 LCD segments, configurable across 4, 6, or 8 backplanes (1:4, 1:6, or 1:8 multiplexing). This supports up to 40 seven-segment characters, 20 fourteen-segment alphanumeric characters, or arbitrary graphics layouts. Segment assignment is managed through its 320-bit display RAM and backplane swap (BPS) feature, enabling flexible PCB routing without changing glass design.
What is the purpose of the OTP-refresh command in the PCF8545BTT/AJ?
The OTP-refresh command reloads factory-programmed calibration data into the PCF8545BTT/AJ's timing circuitry after reset, ensuring accurate frame frequency generation. It must be issued once after power-on or hardware reset and before enabling the display. Failure to execute OTP-refresh may result in incorrect frame rates and visible display flicker. The command completes within 30 ms and requires an active clock source (internal or external).
Can the PCF8545BTT/AJ operate with separate logic and LCD supply voltages?
Yes, the PCF8545BTT/AJ supports independent VDD (1.8 V to 5.5 V) and VLCD (2.5 V to 5.5 V) supplies, allowing optimization of logic noise immunity and LCD contrast independently. VLCD must be ≥ VDD to ensure proper bias generator operation. Simultaneous ramp-up/ramp-down of both supplies is mandatory to prevent static charge accumulation on the LCD glass, which could cause temporary image retention or damage.
PCF8545BTT/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:
- SPI
- 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
PCF8545BTT/AJ FAQ
1.How can I place an order for PCF8545BTT/AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF8545BTT/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 PCF8545BTT/AJ reliable?
The price and inventory of PCF8545BTT/AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8545BTT/AJ is usually 5 days.
3.What payment methods are accepted for PCF8545BTT/AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8545BTT/AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF8545BTT/AJ?
PCF8545BTT/AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF8545BTT/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 PCF8545BTT/AJ?
For technical support, including PCF8545BTT/AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8545BTT/AJ requirements.
6.How does Aetrix verify that PCF8545BTT/AJ is sourced from the original manufacturer or authorized distributors?
All PCF8545BTT/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 PCF8545BTT/AJ meets industry standards.
7.What is the process for return or replacement of PCF8545BTT/AJ?
All PCF8545BTT/AJ units undergo pre-shipment inspection (PSI). If there is an issue with PCF8545BTT/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 PCF8545BTT/AJ part is unused and in its original packaging.
Return procedure for PCF8545BTT/AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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