Reference Design for Segment LCD Control Using GPIO Pins to Increase System Flexibility


Design files


The TIDA-00848 reference design provides an innovative solution for adding LCD functionality to any Smart Grid or IoT application, where seven-segment LCD operation is required but the LCD dsiplay does not have to be always on. Using a few resistors and optimized GPIO control software on a CC1310 SimpleLinkTM Wireless MCU, a seven-segment LCD support is implemented. This design approach can be used with any TI microcontrollers without an on-chip LCD controller module.

  • Innovative solution for driving Seven-segment LCD thru GPIOs by CC1310 SimpleLink Wireless MCU
  • Only 26 I/Os needed for driving 80 seg-ments of a 4-MUX, 1/3-biased LCD
  • Sensor controller peripheral senses the capacitive touch PCB area and reads out the LMT70A sensors periodically
  • 2-layer PCB With HCA form factor using a 96-segment 4-MUX LCD and cap touch area for LCD ON/OFF
  • Average current: 835 nA @ 3.6 V (LCD OFF); 338 uA @ 3.6 V (80 LCD segments ON) under TI RTOS framework

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data

TIDRM27.PDF (487 K)

Detailed schematic diagram for design layout and components

TIDRM28.PDF (161 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRM29.PDF (212 K)

Detailed overview of design layout for component placement

TIDRM31.ZIP (904 K)

Files used for 3D models or 2D drawings of IC components

TIDCC90.ZIP (688 K)

Design file that contains information on physical board layer of design PCB

TIDRM30.PDF (1341 K)

PCB layer plot file used for generating PCB design layout

TIDRM32.PDF (939 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Sub-1 GHz products

CC1310SimpleLink™ 32-bit Arm Cortex-M3 Sub-1 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML
Analog temperature sensors

LMT70A±0.1°C Matching Accuracy Precision Analog Temperature Sensor

Data sheet: PDF | HTML

Start development



TIDA-00848 Firmware — TIDCC91.ZIP (8946 K)

Technical documentation

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Type Title Date
* Design guide Segment LCD Control Using GPIO Pins To Increase System Flexibility Design Guide (Rev. A) Jun. 16, 2016
Technical article Importance of heat-cost allocators in smart meter designs Aug. 05, 2016
More literature TIDA-00848 Firmware Jun. 03, 2016

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