Low-Power NuMicro ML56 Series Microcontrollers with Built-In Capacitive Touch Sensing and LCD Driver

Published  January 22, 2021   0
NuMicro ML56 series Microcontrollers

Nuvoton has launched NuMicro ML56, a new series of low-power microcontrollers, based on 1T 8051 core, embedded 64 KB flash and 4 KB SRAM, built-in capacitive touch key, and LCD driver, running up to 24 MHz. These new microcontrollers run less than 100 µA/MHz in normal run mode, and the power-down current is below 2 µA with LCD panel display on.

NuMicro ML56 series microcontrollers operate from 1.8V to 3.6V and -40°C to 105°C and they run up to 24 MHz, operating from 1.8V to 3.6V and -40°C to 105°C. There are up to 14 channels of touch keys and 224 dots of LCD driver to fulfill the user interface of the smart family and surveillance system of IIoT application that requires user interface and focuses on power consumption. 

These microcontrollers integrate capacitive touch sensing circuit with enhanced touch key controller, supporting up to 14 independent touch channels with low power characteristics, waterproof, and high noise resistance features. The touch key that conducts 10-Vrms noise immunity makes these microcontrollers suitable to be used in home appliances and industrial control.

The microcontrollers are built in 4 COM x 32 SEG, 6 COM x 30 SEG, 8 COM x 28 SEG LCD controller to drive up to 224 dots, and support the Type-A and Type-B LCD panel. They provide two VLCD input sources viz. external voltage and internal charge pump. The internal charge pump keeps the VLCD constant voltage to maintain the display quality of the LCD panel while VDD input changes. There are two VLCD driving modes i.e. external capacitor mode and internal resistor mode. The external capacitor mode with a strong driving current to support a large size panel; the internal resistor mode drives a small size panel and reduces power consumption. 

The CRC-8 checksum feature enables the microcontroller to realize power-on and regular self-test of Flash memory. It also provides up to 4 channels of Peripheral Direct Memory Access (PDMA) controller to speed-up the data transfer and off-loads the CPU loading. For lighting control, the PDMA accompanies with UART or SPI interface can transmit the data continuously. 

NuMicro ML56 series microcontroller is equipped with enhanced analog features like 12-bit 500k SPS ADC, up to 2ch of comparators, 4-level of internal voltage reference for ADC and ACMP. The microcontroller comes with built-in RTC to record data and show calendar while in power-down mode, it also provides three packages: LQFP 44, LQFP48, and LQFP64 with pin-compatible to NuMicro 32-bit microcontrollers to simplify the system design and change parts easily. NuMicro ML56 series microcontrollers are under mass production and its development tools are available at Nuvoton’s official online store.