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8-bit PICs for simple, low-power LCD designs

8-bit PICs for simple, low-power LCD designs

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By Graham Prophet



Functional blocks in the MCUs include a low-current-demand LCD drive charge pump; 12-bit ADC with computation (ADC2); a low-power comparator; and high-frequency oscillator with active clock-tuning. The PIC16F19197 family consists of nine, 28- to 64-pin devices with up to 56 kB Flash and 4 kB RAM. The charge pump ensures that LCD screens maintain consistent contrast as battery-voltage drops. The ADC2 automates signal acquisition and processing tasks, making touch buttons and sliders easy to implement. Active Clock-Tuning feature provides a stable oscillator across the entire voltage and temperature operating range. The PIC16F19197 family is able to accomplish this entirely in hardware rather than relying upon software.

 

The family also features a Real Time Clock and Calendar (RTCC) with battery backup and high-current I/O pins to directly drive the LCD backlighting. IDLE/DOZE low-power modes and Peripheral Module Disable (PMD) extend battery life. The chips can drive up to 360 LCD segments.

 

The family is supported by the MPLAB Code Configurator (MCC), which is a free plug-in for MPLAB X and MPLAB Xpress Integrated Development Environments, providing a graphical interface for the configuration of peripherals and functions specific to each application. The Microchip LCD XLP Explorer Development Board (DM240314) supports evaluation of the PIC16F19197 family of MCUs.

 

Microchip; www.microchip.com/pic16f19197family

 

 

 

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