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Silicon Labs CP2400-GQ
- Part No.:
- CP2400-GQ
- Manufacturer:
- Silicon Labs
- Category:
- Display Drivers
- Package:
- 48-TQFP
- Datasheet:
-
CP2400-GQ.pdf
- Description:
- IC DRVR 128 SEGMENT 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,486
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Product details
Overview
CP2400-GQ from Silicon Laboratories is a fixed-function SPI-interface LCD driver with integrated GPIO expander, real-time clock (SmaRTClock), 256-byte SRAM, and dual 16-bit timers. It drives up to 128 segments in 48-pin QFP packages, supports static/2–4-mux displays, features on-chip bias generation via internal charge pump, and operates from 1.8–3.6 V with ultra-low power LCD mode (<2.3 µA). It serves in battery-powered display interfaces requiring timekeeping and I/O expansion.
For engineers reviewing the CP2400-GQ datasheet, CP2400-GQ pinout, CP2400-GQ application, or CP2400-GQ equivalent, key selection criteria include its 48-pin QFP package, SPI-only interface (no SMBus/I²C), 128-segment LCD drive capability, 36 GPIO expansion pins, and SmaRTClock wake-up functionality - all validated for utility meters and thermostat displays operating at –40 to +85 °C.
Technical Context
The CP2400-GQ implements a dedicated segment COM/SEG architecture with programmable mux configuration (static, 2-/3-/4-mux) and integrated charge-pump-based LCD bias generation. Its SPI interface operates at up to 2.5 Mbps with synchronous external clock or 1 Mbps with internal clock, and uses dedicated NSS, RST, and INT pins for host control and wake-up signaling.
It integrates a self-contained SmaRTClock with 32.768 kHz crystal support, self-oscillate mode, and 36-hour programmable alarm; GPIOs are configurable as push-pull or open-drain outputs with two drive levels and internal pullups; all digital I/O pins are 5 V tolerant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LCD Drive Capacity | Up to 128 segments (48-pin QFP package); enables high-resolution alphanumeric or custom segment displays without external bias circuitry. |
| SPI Interface Speed | Up to 2.5 Mbps with synchronous external clock; ensures fast register access and segment RAM updates in dynamic display applications. |
| GPIO Expansion | 36 configurable I/O pins (48-pin package); supports mixed input/output roles with port match wake-up and 5 V tolerance for direct MCU interfacing. |
| SmaRTClock Current | <2.5 µA typical in RTC-enabled ultra-low-power mode; sustains accurate timekeeping for years on coin-cell batteries. |
| Operating Voltage | 1.8–3.6 V with integrated LDO; simplifies power design in single-supply embedded systems with Li-ion or alkaline battery sources. |
| Ultra-Low-Power LCD Mode | 2.1–2.3 µA typical (static–4-mux, no load); enables always-on display operation in handheld equipment with multi-year battery life. |
| Temperature Range | –40 to +85 °C; qualified for industrial and utility metering environments with extended thermal cycling requirements. |
Pinout & Package
Pb-free 48-pin QFP (9×9 mm footprint), designated by suffix "-GQ". Package includes exposed thermal pad per JEDEC MO-220 VKKD-4 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NSS | Slave Select Input | Active-low chip select; asserts device into low-power mode when deasserted, enabling power-gating without host intervention. |
| MOSI/MISO/SCK | SPI Data/Clock | Full-duplex 4-wire interface; supports burst reads/writes to internal registers and 256-byte SRAM with deterministic timing. |
| RST | Reset Input | Asynchronous active-low reset with internal weak pullup; guarantees known state after power-up or brownout events. |
| INT | Interrupt Output | Push-pull wake-up signal driven by SmaRTClock alarm, port match, or LCD blink completion - eliminates polling overhead. |
| XTAL1/XTAL2 | Crystal Oscillator | Supports 32.768 kHz watch crystal for RTC; also accepts CMOS clock input for crystal-less operation in cost-sensitive designs. |
| CAP | Charge Pump Output | Provides regulated LCD bias voltage; requires 10 µF decoupling capacitor to stabilize contrast across temperature and supply variation. |
| P0.0–P4.3 | GPIO/LCD Pins | Multi-function pins serving as LCD segment drivers (P0–P3) or COM lines (P2/P4); software-configurable as general-purpose I/O with programmable drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD Bias Generation | On-chip charge pump eliminates external resistive divider or DC-DC converter, reducing BOM count and PCB area in space-constrained meters. |
| Port Match Wake-Up | Configurable GPIO edge detection triggers INT pin without CPU polling, extending battery life in sensor-activated security panels. |
| Self-Oscillate RTC Mode | Enables crystal-free timekeeping using internal AGC-controlled oscillator (14 kHz typical), lowering system cost and component count. |
| 5 V Tolerant I/O | Allows direct connection to 5 V microcontrollers without level shifters, simplifying interconnect in legacy industrial control designs. |
| Ultra-Low-Power Shutdown | 0.02 µA typical shutdown current at 3.0 V; preserves battery energy during long-term storage or seasonal device deployment. |
Applications
| Utility Meter Display | Thermostat Interface |
|---|---|
Use Scenario: Digital electricity/gas/water meter with segmented LCD showing consumption, tariff, and status codes. IC Role / Device Role / Timing Role: Primary LCD driver and timekeeper; manages segment refresh, contrast adjustment, and daily billing timestamp via SmaRTClock. Use Value: Enables 10+ year battery life using ultra-low-power LCD mode (2.3 µA) and crystal-free RTC self-oscillate mode. | Use Scenario: Residential HVAC controller with 4-digit temperature readout and mode indicators. IC Role / Device Role / Timing Role: Segment driver + GPIO expander for buttons/LEDs + real-time clock for scheduling and daylight savings correction. Use Value: Reduces MCU GPIO load by 36 pins and provides accurate timekeeping without external RTC IC or crystal. |
| Handheld Test Equipment | Home Security Keypad |
Use Scenario: Portable multimeter or insulation tester with alphanumeric LCD and function keys. IC Role / Device Role / Timing Role: LCD controller with integrated SRAM buffer and GPIO for keypad scanning and backlight control. Use Value: 256-byte SRAM offloads display data buffering from host MCU; low-power modes extend AA/AAA battery life beyond 12 months. | Use Scenario: Wireless security panel with segmented entry code display and tamper-alert LEDs. IC Role / Device Role / Timing Role: Display driver and interrupt-driven I/O expander; wakes host MCU only on keypress or alarm event via Port Match. Use Value: Eliminates continuous keypad polling; achieves sub-µA average system current in armed standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD driver with RTC and GPIO expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CP2402-GM | SPI interface, 48-pin QFN (7×7 mm), same core functionality but different package and pinout; lacks PWR pin (not applicable as it's SPI-only). | Preferred where board space is constrained and QFN reflow is supported; requires PCB redesign due to incompatible footprint and pin mapping. | Select CP2402-GM only if QFN assembly infrastructure exists and thermal pad layout matches MO-220 VKKD-4. |
| PCF8576T/1 | I²C interface, 144-segment drive, no integrated RTC or GPIO expansion; requires external crystal and separate real-time clock IC. | Suitable for cost-sensitive, non-time-critical LCD displays where host MCU handles timing and I/O management. | Choose PCF8576T/1 only when I²C bus availability, lower segment count, and absence of RTC/GPIO requirements align with system architecture. |
Compared with CP2402-GM, CP2400-GQ offers identical feature set but in a larger QFP package suited for manual assembly and thermal management; versus PCF8576T/1, CP2400-GQ integrates RTC and GPIO - eliminating three external components and reducing firmware complexity in time-aware display systems.
Availability
CP2400-GQ is available at Aetrix Electronics and suitable for utility meters, thermostat displays, and handheld test equipment requiring stable component supply and long-term industrial lifecycle support.
Supply support for CP2400-GQ 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
Silicon Laboratories is a fabless semiconductor company specializing in timing, IoT, and mixed-signal solutions for embedded systems.
The CP2400 family was designed as an integrated display interface solution targeting battery-powered industrial and consumer devices needing LCD driving, real-time clock, GPIO expansion, and low-power operation - all in a single chip.
FAQ
What is the maximum LCD segment count supported by the CP2400-GQ?
The CP2400-GQ supports up to 128 segments when used in 48-pin QFP packages like the -GQ variant. This capacity is achieved using its multi-port segment driver architecture (P0–P3) and COM line assignment (P2/P4), enabling full alphanumeric or custom symbol displays without external multiplexing hardware. The 128-segment limit is fixed for this package and interface variant.
Does the CP2400-GQ support I²C or SMBus communication?
No, the CP2400-GQ exclusively supports the 4-wire SPI interface as indicated by its ordering designation and datasheet specifications. I²C/SMBus functionality is reserved for CP2401 and CP2403 variants (e.g., CP2401-GQ). Attempting I²C communication with CP2400-GQ will fail - only MOSI, MISO, SCK, and NSS pins are functional for host interaction.
What package type does the CP2400-GQ use, and what are its key mechanical dimensions?
The CP2400-GQ uses a Pb-free 48-pin TQFP package (9×9 mm body, 1.0 mm nominal height) per JEDEC MO-220 outline. Key dimensions include 0.5 mm pitch, 7.0 mm × 7.0 mm exposed pad, and 0.60 mm nominal lead length. This QFP variant facilitates manual soldering and thermal relief in industrial PCB layouts where QFN reflow may be impractical.
Can the CP2400-GQ operate without an external 32.768 kHz crystal?
Yes, the CP2400-GQ supports crystal-less operation via its SmaRTClock self-oscillate mode, which uses an internal AGC-controlled oscillator (14 kHz typical). While less accurate than crystal-based timekeeping, this mode eliminates the crystal and associated load capacitors - reducing BOM cost and board space in applications where ±5% time accuracy is acceptable.
How many GPIO pins does the CP2400-GQ provide, and what are their electrical characteristics?
The CP2400-GQ provides up to 36 GPIO pins (P0.0–P3.7 plus P4.0–P4.3) in its 48-pin QFP configuration. Each pin supports push-pull or open-drain output with selectable high/low drive strength, digital input with internal pullups, and 5 V tolerance. Output high voltage exceeds VDD – 0.7 V at 3 mA, and output low voltage stays below 0.6 V at 8.5 mA - ensuring robust interfacing with diverse MCUs.
CP2400-GQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Display Type:
- LCD
- Configuration:
- 128 Segment
- Interface:
- SPI
- Digits or Characters:
- -
- Current - Supply:
- 620 µA
- Voltage - Supply:
- 1.8V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP (7x7)
CP2400-GQ FAQ
1.How can I place an order for CP2400-GQ through Aetrix?
Please submit a Request for Quotation (RFQ) for CP2400-GQ 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 CP2400-GQ reliable?
The price and inventory of CP2400-GQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CP2400-GQ is usually 5 days.
3.What payment methods are accepted for CP2400-GQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CP2400-GQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CP2400-GQ?
CP2400-GQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CP2400-GQ 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 CP2400-GQ?
For technical support, including CP2400-GQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CP2400-GQ requirements.
6.How does Aetrix verify that CP2400-GQ is sourced from the original manufacturer or authorized distributors?
All CP2400-GQ 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 CP2400-GQ meets industry standards.
7.What is the process for return or replacement of CP2400-GQ?
All CP2400-GQ units undergo pre-shipment inspection (PSI). If there is an issue with CP2400-GQ, 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 CP2400-GQ part is unused and in its original packaging.
Return procedure for CP2400-GQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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