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Silicon Labs CP2400-GMR
- Part No.:
- CP2400-GMR
- Manufacturer:
- Silicon Labs
- Category:
- Display Drivers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
CP2400-GMR.pdf
- Description:
- IC DRVR 128 SEGMENT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,205
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Product details
Overview
CP2400-GMR from Silicon Laboratories is a fixed-function 48-pin QFN LCD driver with integrated GPIO expander, SmaRTClock RTC, 256-byte SRAM, and dual 16-bit timers. It supports up to 128-segment LCDs (4-mux), operates from 1.8–3.6 V, delivers ultra-low power LCD mode current of 2.3 µA (typ), and features 5 V-tolerant I/O pins. It serves as a system peripheral in battery-powered display interfaces requiring timekeeping and I/O expansion.
For engineers reviewing the CP2400-GMR datasheet, CP2400-GMR pinout, CP2400-GMR application, or CP2400-GMR equivalent, key selection criteria include its SPI interface (not SMBus/I²C), 48-pin QFN-7×7 mm package, 128-segment LCD drive capability, 36 GPIO expansion pins, and <1.5 µA RTC operating current - all critical for low-power embedded display subsystems.
Technical Context
The CP2400-GMR implements a dedicated LCD controller with on-chip charge pump bias generation, supporting static, 2-/3-/4-mux configurations without external components. Its SmaRTClock uses either a 32.768 kHz crystal, self-oscillate mode, or external CMOS clock, enabling programmable 36-hour alarm wake-up.
It integrates a 20 MHz internal oscillator and accepts external CMOS clock input via CLK pin; host communication occurs over 4-wire SPI at up to 2.5 Mbps (synchronous) or 1 Mbps (internal clock). All digital I/O pins are 5 V tolerant, and power management includes Ultra Low Power LCD Mode (<3 µA typical) and Shutdown Mode (0.02 µA typ at 3.0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LCD Drive Capacity | 128 segments (4-mux), enabling compact multi-digit alphanumeric displays without external segment drivers |
| Interface Type | SPI only (4-wire: MOSI/MISO/SCK/NSS); no I²C/SMBus support - requires SPI-capable host controller |
| GPIO Expansion | Up to 36 configurable I/O pins (push-pull/open-drain/digital input), with port match interrupt wake-up capability |
| RTC Accuracy & Power | SmaRTClock with 32.768 kHz crystal option; 2.5 µA typical supply current in RTC-only mode |
| Supply Voltage Range | 1.8–3.6 V with integrated LDO - compatible with single-cell Li-ion or 3.3 V regulated systems |
| Ultra-Low Power Modes | ULP LCD Mode: 2.3 µA (4-mux, 60 Hz, crystal); Shutdown Mode: 0.02 µA at 3.0 V |
| Package | Pb-free 48-pin QFN (7×7 mm footprint, 0.5 mm pitch) - suitable for space-constrained PCB layouts |
Pinout & Package
Pb-free 48-pin QFN package (7×7 mm body, 0.5 mm pitch), thermally enhanced with exposed pad. Pin count and function mapping align with CP2400-GM/GQ variants per Silicon Labs Rev. 1.1 documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports 32.768 kHz watch crystal for RTC; XTAL1 accepts external CMOS clock input |
| NSS / SCK / MOSI / MISO | SPI bus interface | 4-wire SPI slave interface; NSS enables low-power entry; SCK max 2.5 Mbps with synchronous clock |
| INT | Interrupt output | Push-pull active-low interrupt signal for RTC alarm, port match, or LCD blink events |
| RST | Reset input | Asynchronous active-low reset with internal weak pullup; 15 µs minimum pulse width required |
| CAP | Charge pump output | Drives 10 µF decoupling capacitor to generate LCD bias voltage; no external components needed |
| P0.0–P4.3 | GPIO/LCD segment/COM drivers | Multi-function pins: P0–P3 serve as LCD segment outputs; P2/P4 serve as COM outputs in 48-pin config |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD bias generation | On-chip charge pump eliminates need for external resistive divider or DC-DC converter for LCD contrast control |
| Port Match wake-up | Configurable GPIO change-detection interrupt allows host MCU to remain in deep sleep until specific I/O event occurs |
| Self-oscillate RTC mode | Enables crystal-less RTC operation using internal AGC-controlled oscillator (14 kHz typ), reducing BOM cost and board area |
| 5 V tolerant I/O | All GPIO and interface pins withstand 5 V logic levels - simplifies level-shifting in mixed-voltage systems |
| Dual 16-bit timers | Independent general-purpose timers usable for PWM generation, interval timing, or event capture in host-coordinated applications |
Applications
| Handheld Equipment | Utility Meters |
|---|---|
Use Scenario: Portable diagnostic tool with segmented LCD display, push-button interface, and battery runtime optimization. IC Role / Device Role / Timing Role: CP2400-GMR drives 128-segment LCD, expands MCU GPIO for keypad scanning, and maintains accurate time/date via SmaRTClock. Use Value: Reduces component count by integrating LCD driver, RTC, and GPIO expander; ULP LCD mode extends battery life beyond 5 years on coin cell. | Use Scenario: Smart electricity meter with LCD display, tamper detection inputs, and real-time energy logging. IC Role / Device Role / Timing Role: CP2400-GMR provides LCD segment control, monitors external sensors via GPIO inputs, and timestamps consumption data using 32.768 kHz crystal. Use Value: 5 V-tolerant I/O interfaces directly with legacy metering peripherals; shutdown current <0.05 µA ensures compliance with IEC 62053-21 low-power requirements. |
| Thermostat Display | Home Security Systems |
Use Scenario: Wireless thermostat with 4-digit LCD, temperature sensor interface, and scheduled HVAC control. IC Role / Device Role / Timing Role: CP2400-GMR manages LCD refresh, reads ambient sensor status via GPIO, and triggers daily schedule alarms using 36-hour programmable counter. Use Value: Integrated 256-byte RAM stores calibration offsets and schedule tables locally; eliminates need for external EEPROM in cost-sensitive designs. | Use Scenario: Panel-mounted security keypad with backlit LCD, door/window contact monitoring, and system arming timer. IC Role / Device Role / Timing Role: CP2400-GMR drives LCD segments, scans zone inputs via GPIO, and provides precise 24-hour countdown for entry delay using SmaRTClock alarm. Use Value: Port match wake-up reduces host MCU wake cycles; ultra-low shutdown current preserves backup battery during AC power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD driver + RTC + GPIO expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CP2400-GQ | Same SPI interface, identical electrical specs, but in 48-pin TQFP (9×9 mm) package instead of QFN | TQFP offers easier prototyping and rework; QFN provides better thermal performance and smaller footprint | Select CP2400-GQ for hand-soldered prototypes or legacy TQFP-compatible layouts; CP2400-GMR for volume production with automated assembly and space constraints |
| CP2402-GM | SPI interface variant with COM pins relocated to Port 2 (P2.0–P2.3), reducing available GPIO by 4 pins vs. CP2400-GMR | Optimized for simpler 32-pin LCD configurations (64 segments); not suitable for full 128-segment designs requiring P4.x COM pins | Choose CP2402-GM only when display mux count ≤ 2 and PCB layout prioritizes pin count reduction over GPIO flexibility |
Compared with CP2400-GQ, CP2400-GMR offers superior thermal dissipation and 30% smaller PCB area; versus CP2402-GM, it retains full 36 GPIO and P4.x COM routing essential for 4-mux 128-segment displays - making it the only variant supporting maximum LCD complexity in QFN form factor.
Availability
CP2400-GMR is available at Aetrix Electronics and suitable for handheld equipment, utility meters, and thermostat display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CP2400-GMR 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 mixed-signal ICs for timing, wireless, MCU, and sensor applications.
The CP2400 family was designed to integrate LCD driving, real-time clock, GPIO expansion, and memory into a single low-power peripheral IC for cost-sensitive, battery-operated display systems.
FAQ
What interface protocol does the CP2400-GMR support?
The CP2400-GMR supports only the 4-wire SPI interface (MOSI, MISO, SCK, NSS) and does not implement SMBus or I²C. It operates at up to 2.5 Mbps with synchronous external clocking or 1 Mbps using its internal 20 MHz oscillator. This distinguishes it from CP2401/CP2403 variants, which use SMBus/I²C.
Does CP2400-GMR require an external crystal for RTC operation?
No - CP2400-GMR supports three RTC clock sources: external 32.768 kHz crystal (XTAL1/XTAL2), external 32 kHz CMOS clock input (via XTAL1), or self-oscillate mode using internal AGC-controlled oscillator (14 kHz typical). Crystal is optional and used only when highest RTC accuracy is required.
How many GPIO pins can be configured on CP2400-GMR?
CP2400-GMR provides up to 36 GPIO pins (P0.0–P3.7 plus P4.0–P4.3) in its 48-pin QFN package. Each pin supports push-pull or open-drain output with two drive strength levels, or digital input with optional internal pullups - enabling flexible peripheral interfacing without external buffers.
What LCD multiplexing configurations does CP2400-GMR support?
CP2400-GMR supports static, 2-mux, 3-mux, and 4-mux LCD configurations. In 4-mux mode with 32 COM lines (P2.0–P2.3 and P4.0–P4.3), it drives up to 128 segments (32 × 4), making it suitable for multi-digit alphanumeric displays common in utility meters and thermostats.
Is CP2400-GMR pin-compatible with other CP2400 family members?
CP2400-GMR shares identical pinout and functionality with CP2400-GM (same QFN-48 package and SPI interface), differing only in tape-and-reel packaging and moisture sensitivity level. It is not pin-compatible with CP2401/CP2403 (SMBus/I²C) or CP2402 (relocated COM pins), as those variants have different pin assignments for interface and COM signals.
CP2400-GMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-QFN (7x7)
CP2400-GMR FAQ
1.How can I place an order for CP2400-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for CP2400-GMR 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-GMR reliable?
The price and inventory of CP2400-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CP2400-GMR is usually 5 days.
3.What payment methods are accepted for CP2400-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CP2400-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CP2400-GMR?
CP2400-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CP2400-GMR 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-GMR?
For technical support, including CP2400-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CP2400-GMR requirements.
6.How does Aetrix verify that CP2400-GMR is sourced from the original manufacturer or authorized distributors?
All CP2400-GMR 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-GMR meets industry standards.
7.What is the process for return or replacement of CP2400-GMR?
All CP2400-GMR units undergo pre-shipment inspection (PSI). If there is an issue with CP2400-GMR, 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-GMR part is unused and in its original packaging.
Return procedure for CP2400-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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