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NXP Semiconductors PCA8551BTT/AJ
- Part No.:
- PCA8551BTT/AJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Display Drivers
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PCA8551BTT/AJ.pdf
- Description:
- IC DRVR 144 SEGMENT 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
PCA8551BTT/AJ from NXP Semiconductors is an AEC-Q100 Grade 2 automotive LCD segment driver with 36 segment and 4 backplane outputs, SPI-bus interface (5 MHz), internal oscillator, and independent VLCD/VDD supplies (1.8 V to 5.5 V). It supports 1:4 multiplex drive with 1/3 bias and enables up to 144-segment graphical displays in instrument clusters.
For engineers reviewing the PCA8551BTT/AJ datasheet, PCA8551BTT/AJ pinout, PCA8551BTT/AJ application, or PCA8551BTT/AJ equivalent, this page delivers verified technical context, exact pin functions, real-world display configurations, and validated alternative options for automotive LCD subsystem design.
Technical Context
The PCA8551BTT/AJ implements a dedicated SPI-bus controller (CE, SCL, SDIO) and integrates on-chip LCD bias generation with selectable 1/2 or 1/3 bias modes and static/2/3/4-backplane multiplexing. Its display controller supports auto-incrementing register writes and frame/line inversion for DC voltage compensation.
It features hardware Power-On Reset enable via PORE pin, software reset command (0x2C), and configurable frame frequency (32–256 Hz). The device operates across –40 °C to +105 °C and maintains register state in power-down mode until display enable (DE) bit is set.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | SPI-bus: CE (active-low chip enable), SCL (serial clock), SDIO (bidirectional data) - requires 3-wire host control. |
| Segment/Backplane Count | 36 segment outputs (SEG0–SEG35) and 4 backplane outputs (COM0–COM3) - supports up to 144-element LCDs (e.g., 18×7-seg or 9×14-seg). |
| Supply Ranges | VDD and VLCD both 1.8 V to 5.5 V - allows flexible biasing and single-supply system integration with independent voltage optimization. |
| Multiplex & Bias Modes | Selectable 1:1 (static), 1:2, 1:3, or 1:4 multiplex; 1/2 or 1/3 bias - determines required LCD module construction and contrast performance. |
| Frame Frequency | Configurable 32 Hz to 256 Hz (8 steps) - adjusts flicker suppression and power consumption per display refresh requirement. |
| Operating Temperature | –40 °C to +105 °C - qualified per AEC-Q100 Grade 2 for under-hood and instrument cluster deployment. |
| Blink Control | Programmable blink at 0.5 Hz, 1 Hz, or 2 Hz - enables visual status indication without host MCU intervention. |
Pinout & Package
TSSOP48 package (SOT362-1): plastic thin shrink small outline, 48 leads, body width 6.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 18–48 | SEG0 to SEG35 | Active-low segment drivers - directly connect to LCD segment electrodes; each drives one element in selected multiplex phase. |
| 6–9 | COM0 to COM3 | Backplane outputs - generate time-multiplexed common electrode waveforms synchronized with segment data. |
| 10 | VLCD | Dedicated LCD supply input - powers internal bias generator and sets RMS voltage levels for contrast control. |
| 11 | VDD | Digital core supply - powers logic, SPI interface, and register bank; independent from VLCD for optimal noise isolation. |
| 12 | VSS | Ground reference - common return for digital and analog sections; requires low-impedance PCB connection. |
| 13 | SDIO | SPI bidirectional data line - carries command/data during write and read operations; requires pull-up for read mode. |
| 14 | CLK | Oscillator I/O - outputs internal clock when COE=1; accepts external clock when OSC=1; must be open if unused. |
| 15 | SCL | SPI serial clock input - synchronizes all data transfers; driven by host MCU; edge-triggered sampling. |
| 16 | CE | Chip enable (active-low) - enables SPI communication only when asserted; allows multi-device bus sharing. |
| 17 | PORE | Power-On Reset enable - tie to VDD to activate internal POR; tie to VSS to disable and require software/hardware reset. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Validated for automotive operation from –40 °C to +105 °C - eliminates need for additional thermal derating in instrument panel designs. |
| Independent VLCD and VDD supplies | Enables optimized contrast (via VLCD tuning) and stable logic operation (via separate VDD) - critical for wide-temperature LCD readability. |
| Internal LCD bias generation | On-chip 3-resistor divider with buffered 1/2 or 1/3 taps - removes external resistor networks and reduces BOM count and layout area. |
| Auto-incrementing display RAM access | Sequential register writes (04h–17h) update display data without repeated address bytes - cuts SPI transaction overhead by ~40 %. |
| Versatile blinking and inversion modes | Hardware-controlled blink (0.5/1/2 Hz) and frame/line inversion - ensures long-term LCD reliability without firmware polling or timer resources. |
| Enhanced power drive (BOOST) | Increases segment drive current for high-capacitance displays (e.g., large automotive modules) - prevents dimming or ghosting at full segment count. |
Applications
| Automotive Instrument Cluster | Industrial Control Panel |
|---|---|
|
Use Scenario: Driving analog-style speedometer, fuel gauge, and warning icons in a vehicle dashboard with 144-segment LCD. IC Role / Device Role / Timing Role: Primary segment driver managing 4 backplanes and 36 segments via SPI; generates precise multiplexed waveforms with 1/3 bias and 128 Hz frame rate. Use Value: Enables AEC-Q100-compliant, flicker-free display operation at –40 °C to +105 °C using single-chip bias generation and no external timing components. |
Use Scenario: Displaying status, setpoints, and alarms on a factory HMI with alphanumeric 14-segment characters and custom icons. IC Role / Device Role / Timing Role: Standalone LCD controller/driver handling 9×14-seg layout (126 segments) with programmable blink and frame inversion. Use Value: Reduces MCU GPIO and timer usage via hardware blink control and auto-incrementing RAM writes - simplifies firmware and improves real-time response. |
| Portable Medical Device | Smart Appliance Interface |
|
Use Scenario: Power-efficient display for battery-operated blood glucose meter or pulse oximeter with numeric and symbol segments. IC Role / Device Role / Timing Role: Ultra-low-power LCD driver using 1.8 V VDD/VLCD, static or 1:2 drive mode, and software-controlled power-down. Use Value: Achieves sub-10 µA standby current while retaining display RAM contents - extends battery life without display reinitialization on wake-up. |
Use Scenario: Consumer appliance display showing cooking time, temperature, and cycle progress using 7-segment digits and fixed icons. IC Role / Device Role / Timing Role: Cost-optimized segment driver supporting 18×7-seg (126 segments) with integrated bias and SPI host interface. Use Value: Eliminates external bias resistors and clock source - reduces total solution size and component count versus discrete driver + controller approach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF8576DT/1,118 | 40-segment × 4-backplane; I²C interface (400 kHz); same TSSOP48 package; AEC-Q100 Grade 2. | Higher segment count but lacks SPI interface and BOOST mode; requires external bias resistors. | Choose for I²C-based systems needing extra segments; avoid when SPI host or enhanced drive capability is required. |
| RA8835-GN | Parallel 8-bit interface; 132 × 64 dot-matrix support; no built-in bias generator; requires external Vop. | Targets graphic LCDs, not segment-based; demands more MCU pins and external power circuitry. | Choose only for dot-matrix displays; not suitable as drop-in replacement for segment-only applications like PCA8551BTT/AJ. |
Compared with PCF8576DT/1,118 and RA8835-GN, the PCA8551BTT/AJ uniquely combines SPI interface, on-chip bias generation, BOOST mode for high-load segments, and AEC-Q100 qualification - making it optimal for space-constrained, automotive-grade segment LCDs requiring minimal external components.
Availability
PCA8551BTT/AJ is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMIs, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA8551BTT/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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal and display interface ICs.
The PCA8551 product line delivers integrated LCD segment drivers for automotive-grade instrumentation, emphasizing AEC-Q100 compliance, ultra-low power, and simplified bias architecture to reduce system-level design complexity.
FAQ
What interface does the PCA8551BTT/AJ use, and how does it differ from the PCA8551ATT/AJ?
The PCA8551BTT/AJ uses a 3-wire SPI interface (CE, SCL, SDIO) operating up to 5 MHz, while the PCA8551ATT/AJ uses a 2-wire I²C interface (SCL, SDA) at 400 kHz. Pin assignments differ: PCA8551BTT/AJ replaces RST and SDA with CE and SDIO, and its CLK pin functions as oscillator I/O. This makes PCA8551BTT/AJ suitable for faster, deterministic host communication in resource-constrained automotive microcontrollers.
Does the PCA8551BTT/AJ require external components for LCD bias generation?
No, the PCA8551BTT/AJ includes an internal LCD bias generator with buffered 1/2 or 1/3 voltage taps derived from VLCD, eliminating external resistor dividers. This reduces BOM cost and PCB area while improving temperature stability. External capacitors (≥100 nF) are still required on VDD and VLCD for decoupling, as specified in the datasheet.
How does the BOOST feature in the PCA8551BTT/AJ improve display performance?
When the BOOST bit is set in Display_ctrl_1 register, the PCA8551BTT/AJ increases segment output drive strength to support LCDs with higher effective capacitance - such as large automotive modules or stacked-glass displays. This prevents segment dimming or slow response, though it raises VLCD current consumption. It is enabled only when needed, preserving ultra-low-power operation otherwise.
Can the PCA8551BTT/AJ operate with different multiplex configurations, and how is this controlled?
Yes, the PCA8551BTT/AJ supports static (1:1), 1:2, 1:3, and 1:4 multiplex drive modes via MUX[1:0] bits in Display_ctrl_1 register. Each mode activates a specific number of COM outputs (1–4) and configures waveform timing and bias. For example, 1:4 mode uses COM0–COM3 and 1/3 bias, enabling full 144-segment utilization; 1:2 mode uses only COM0–COM1 and supports 72 segments with optional 1/2 or 1/3 bias.
What is the role of the PORE pin on the PCA8551BTT/AJ, and how should it be configured?
The PORE (Power-On Reset Enable) pin controls activation of the internal POR circuit. Tie PORE to VDD to enable automatic reset on power-up; tie to VSS (or leave open) to disable POR and require explicit software or external reset. A series resistance ≤1 kΩ is mandatory if pulled to VDD. Disabling POR allows deterministic initialization in systems with tightly controlled power sequencing.
PCA8551BTT/AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- 144 Segment
- Interface:
- SPI
- Digits or Characters:
- 9 Characters, 18 Characters, 144 Elements
- Current - Supply:
- 1.8 µA
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
PCA8551BTT/AJ FAQ
1.How can I place an order for PCA8551BTT/AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA8551BTT/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 PCA8551BTT/AJ reliable?
The price and inventory of PCA8551BTT/AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8551BTT/AJ is usually 5 days.
3.What payment methods are accepted for PCA8551BTT/AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8551BTT/AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA8551BTT/AJ?
PCA8551BTT/AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA8551BTT/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 PCA8551BTT/AJ?
For technical support, including PCA8551BTT/AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8551BTT/AJ requirements.
6.How does Aetrix verify that PCA8551BTT/AJ is sourced from the original manufacturer or authorized distributors?
All PCA8551BTT/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 PCA8551BTT/AJ meets industry standards.
7.What is the process for return or replacement of PCA8551BTT/AJ?
All PCA8551BTT/AJ units undergo pre-shipment inspection (PSI). If there is an issue with PCA8551BTT/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 PCA8551BTT/AJ part is unused and in its original packaging.
Return procedure for PCA8551BTT/AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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