Reference Design For Segmented LCD LCD Screen Control

Seven-stage LCD displays are very popular in the ultra-low market!

Power metering and diving applications, such as thermal cost dividers, water and heat meters, are usually controlled by a dedicated on-chip LCD controller module in a single chip computer. This design shows an alternative, patent-pending solution for any timcu without such an on-chip module.

Using some resistors and GPIO control software, LCD drivers have been featured in the CC1310 wireless MCU. This design shows how to add LCD functionality to any application where the LCD is required but not always turned on. The LCD itself is turned off in most cases and only enabled when necessary. The available GPIO line wireless MCU is supported LCD segments.

CC1310 Simple link wireless MCU control, seven segment LCD display via gpios only 4 COM, 2 control lines and 20 segment lines (total 26 I/O) need to drive 80 LCD segments (4-MUX, 4-MUX, 4-MUX, 4-MUX, 4-MUX) 1/3- offset) Sensor controller peripherals sense capacitance touching PCB area and reading LMT70A periodic sensor using 96-segment LCD (4-MUX) and touch cover area LCD screen on/off average current: 835 mA, 3.6 volts (LCD off); 38-A to 3.6V (80 LCD segments open)

Does any measuring and diving subsystem use the ti-mcu's segmented lcd function without an on-chip LCD controller? The 433- or 868MHz bands with Ti-MCUs and SevenSegmentLcds feature TIMCU's Internet of Things (IoT) applications and seven-segment LCDS

Critical system specification

The CC1310 wireless MCU operates from 1.8 to 3.8V (3.9V is the absolute maximum allowed). The LMT70A operates at 2.0 to 5.5V (the matched CMOS temperature sensor operates at 30°C at 0.1°C); When the temperature drops to 0°C, at least 2.1V is needed, while at 20°C, 2.0V is sufficient.
When the thermal cost distributor (HCA) starts recording at temperatures of 20°C or above, the voltage of the public supply TIDA-00848 is 2.0 to 3.8V.

This is ideal for primary battery chemistry, rated at 3.6 or 3.0 volts. The CC131033 operates at an ambient temperature of Ta=-40°C to 85°C, while the LMT70A has a wider TA operating range of -55°C to 150°C. Many low-cost surveying and diving applications require seven-stage LCD capabilities due to the low power consumption, low cost, and small size of these displays. All of these LCD-based applications can keep the LCD always on or can tolerate a temporary shutdown of the LCD to save power. Water and calorimeters and HCAS products already deployed in the field can be allocated to either of these two categories. Sometimes, depending on the regulations of a particular country, it may be necessary to always turn on the LCD function.

If this is the case, then the on-chip LCD controller module in the microcontroller must have the lowest power consumption. Another way is to have a solution that allows users to read the LCD when they like; In most cases, when no one is reading the monitor, the LCD function will be disabled to preserve power. For the latter application, tida-00848 has proposed an innovative ti patent-filing solution. Software controlled GPIO for driving seven-segment LCD. Such as CC13xx, CC26xx or MSP43x product family. tida-00848 represents a single chip computer hca design reference design HCAS for wm bus at 868mhz that meets these EN834 requirements:

Two LMT70A temperature sensors, matched in production to 0.1°C at 30°C (maximum) with CC1310 wireless SOCs, WM bus TIDA-00848 for 868MHz RF subsystems with S, T and C modes drives LCD seven-segment displays and special software via a dedicated external resistance network, Provided as an open source example. The CC1310's sensor controller peripherals are directly connected to two LMT70A sensors, which are periodically enabled to measure temperature; Otherwise, the sensor is powered off. At the same time, the sensor controller checks for one PCB touch event per second. If it detects an event, the LCD function will be enabled, and the LCD will be periodically enabled and disabled from now on. When enabled, the LCD displays the string "cc1310" and opens all supported 80 segments.