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4.2″ PCAP Touchscreen LCD GUI (Production Module) – SuRG42-CP
4.2″ PCAP Touchscreen LCD GUI (Production Module) – SuRG42-CP - Image 2
4.2″ PCAP Touchscreen LCD GUI (Production Module) – SuRG42-CP - Image 3
4.2″ PCAP Touchscreen LCD GUI (Production Module) – SuRG42-CP - Image 4

4.2″ PCAP Touchscreen LCD GUI (Production Module) – SuRG42-CP

Part #: SuRG42-CP (Production Module)
Request a volume price quote from FDI: Request Quote Form
For distribution pricing, click on the Purchase Info tab.

Status: Prototypes (coming April 2026)
Production guaranteed: Until 2035
Warranty: 1 Year (Extended available)

Associated Part #: SuRG42-CP-DK (Development Kit)

  • 4.2″ Sunlight-Readable TFT Display
  • 400 x 300 three color display with Projected Capacitive (PCAP) Touchscreen
  • FreeRTOS Real Time Operating System Project Files
  • Advanced Rapid Software Development Platform provided by STM32Cube IDE
  • STM U585 160MHz MCU (Arm Cortex M33) with 2MB Internal Flash, 768K Internal SRAM
  • 16MB QSPI Flash, 2MB Low Power SRAM, 128KB EEPROM, ESP32-WROOM32 Wireless
  • Expansion: UART, I²C, SPI, ADC, GPIO, CAN, USB Host/Device

>> See the brochure

SKU: SuRG42-CP (Production Module) Categories: , ,

Overview

The SuRG42-CP delivers what battery-powered and outdoor applications demand: a sunlight-readable 4.2″ PCAP touchscreen with exceptional power efficiency. Built on a high-performance STM32 MCU (ARM Cortex M33) with 2MB flash, 768KB RAM, and FreeRTOS support, the SuRG42-CP provides a ready-to-code platform with advanced graphics capabilities and rapid development through STM32Cube IDE.

The crystal-clear display eliminates backlight power consumption in outdoor and well-lit environments, dramatically extending battery runtime while maintaining excellent readability. An optional PWM-controllable frontlight Bluetooth enables usage in low-ambient conditions, providing complete operational flexibility while preserving the ultra-low power advantage when lighting isn’t needed.

By leveraging a transmissive reflective display that remains clearly visible without backlighting, the SuRG42-CP consumes minimal power – just 4.4mW idle and 71.23mW active – making it ideal for applications where every milliwatt counts.

Power Consumption Details (with Vin at 3V):

     Input Current
  • Idle: 1.4mA (Images on the display are visible)
  • Idle, w/ Touch Wakeup: 2.6mA (Images on the display are visible)
  • Active: 24mA (Able to update images on the display)
  • Active, with Frontlight: 61mA
  • Power Down: 30uA (MCU powered down)
     Input Power Consumption
  • Idle: 4.4mW (Images on the display are visible)
  • Idle, w/ Touch: 7.7mW (Images on the display are visible)
  • Active: 71mW (Able to update images on the display)
  • Active, with Frontlight: 184mW
  • Power Down: 80uW (MCU powered down)

     System current consumption fluctuates based on peripheral utilization and display writes. 
     Characterization shows a current variation of ±6% (Idle) and ±11% (Active) relative to reported averages.

Quick Start Documentation

Quick Start Guide

Associated Kit Contents:

  • 4.2” PCAP Touch Screen LCD GUI Production Module (PN: SuRG42-CP)
  • One USB Type A to USB Type C Cable
  • AC to 5V USB Wall Power Adapter
  • High Speed microSDHC Card (4GB or larger)
  • J-Link Debugger/Programmer Probe (PN: J-link Lite CortexM-9)
  • Tag-Connect 10 to 6 pin Cable with leg clamps (PN: TC2030-CTX 6-Pin Cable for ARM Cortex)
  • One USB Type A to USB Type Mini-B Cable
  • One SuRG DEMO BOARD with Cable
  • Expansion board with 70-pin breakout, MicroSD Card socket, Input Power connector and not-usable RS232 (for SuRG42-CP)
  • 50 Pin Flex Cable

Specifications

Microcontroller

STM U585
- Speed

160MHz
- Internal SRAM

768KB
- Internal Flash

2MB
External Flash

16MB
External Flash Type

QSPI (4 Bit serial)
Non-volatile data storage

Internal 128Kb EEPROM
SD Card Bus interface

4-Bit SD mode @ 50MHz
USB

USB Device Mini-AB for Host or Device Operation
Expansion

50-pin Fine Pitch I/O Connector for External Expansion:Serial Ports, UART, I²C, SPI, USB Host/Device interface
Temperature Sensor

Yes
JTAG

Cortex-M 6-pin SWD JTAG Debug Tag-Connect
RTC

Internal RTC, Supercap backup
Audio

On-board Buzzer
Operating Temperature:

-20° to 70° C
Storage Temperature:

-30° to 80° C
Power Input

Alt Power Connector or USB-C (5V 3A) Connector
Input Voltage:

3.0 to 24.0 VDC (±5%) (Alt Power or Expansion Connector)
5.0VDC (USB C Connector)
Power Consumption (@3V):

1.4mA (Idle), 2.6mA (Idle, w/ Touch), 24mA (Active), 61mA (Active, w/ Frontlight)
Overall Size

116:84(W) x 78.61(H) x 17.68 (D) mm
Mounting:

#6 screws in 4 corners
Weight:

98 grams (typ)
RoHS Compliant:

Yes
Screen Size (diagonal)

4.2 inches
Display Technology

Reflective TFT-LCD
Resolution

400 x 300
Brightness (when front light is on)

~20 nits
Ambient Contrast Ratio (ACR)

17:1 (frontlight off), 15:1 (frontlight on)
Aspect Ratio

4 x 3
Colors:

3 (RWB) (2-bit)
Vertical Viewing Angle:

60/60° U/D
Horizontal Viewing Angle:

60/60° L/R
Surface Finish:

Anti-glare
Touchscreen type

Projected Capacitive
Active Area:

63.60 x 84.80 MM
Response Time:

30ms Tr+Tf (typ)
Kit Available?

Yes

Documentation

Initial Release Rev = 2.2

TitleTypeFormatDate
BrochureBrochurepdf04/08/2026
SuRG42-CP Quick Start GuideQuick Start Guidepdf04/08/2026
Start-Here GuideStart Here Guidepdf03/18/2026
SuRG42-CP User's ManualUser's Manualpdf04/08/2026

Software

TitleTypeFormatDate
Converting Images for Use on SuRGInstruction Document.pdf09/23/2025
SD Card FilesSD Card Files.zipmm/dd/yyyy
SuRG Image Conversion ScriptsScripts in .zip.zip09/23/2025
FDI Software

SuRG® Source Files
SuRG® is an open source, embedded middleware platform providing underlying RTOS and processor abstraction features enhancing portability of application code to multiple ARM platforms with high reusability.

Recommended 3rd Party Software

STM32CubeIDE
STM32 compiler and development suite.

FreeRTOS
Developed in partnership with the world’s leading chip companies over a 12 year period, FreeRTOS is the market leading real time operating system (or RTOS), and the de-facto standard solution for microcontrollers and small microprocessors.

LVGL
LVGL is an open-source, lightweight library for designing Graphical User Interfaces (GUI) for any embedded application that operates with a graphical LCD. It is compatible with single-task and multitask environments. It may be adapted to any size physical and virtual display with any LCD controller and CPU.

J-Link Software Downloads
Various Various Download latest software and drivers from the SEGGER website.

Resources

J-Link Product Page
SEGGER J-Links are the most widely used line of debug probes available today. They’ve been proven for more than 10 years with over 250,000 units sold, including OEM versions and on-board solutions. This popularity stems from the unparalleled performance, extensive feature set, large number of supported CPUs, and compatibility with all popular development environments.

Support

Support

Once you’ve picked up your SuRG Unit, FDI is with you every step of the way. We offer support and documentation on our forums.

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SuRG Software

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Quick Start GUI Program
  • Customer Provides Menu Inputs
  • Photoshop, PowerPoint or even napkin drawings
  • Simple Menus and Functions usually less than 8 screens
  • 1-2 week turnaround for $5,000 or less
  • Customer starts API level application development immediately

Partners

NXP
Renesas

ARM
SEGGER

STMicroelectronics
SAFERTOS

FreeRTOS