This document introduces the hardware design of DB101, including circuit schematics, PCB layout, bill of materials, etc.
The DB101 is a graphical LCD module that demonstrates how to use an AVR® microcontroller to control a 128 × 64 pixel LCD with RGB backlight. It can serve as a human‑machine interface for other application boards and provides UART, SPI, TWI and RS232 communication interfaces with level converters.
The document covers the board description, power supply options (1.8 V‑5.5 V external or on‑board coin‑cell battery), hardware revision pins, schematics, bill of materials and programming/debugging interfaces such as JTAG and ISP.
| LCD resolution | 128 × 64 pixels |
|---|---|
| Power supply range (external) | 1.8 V to 5.5 V |
| Microcontroller | ATmega1281 (64 pins, 128 kB Flash, 8 kB SRAM) |
| System clock source | 7.37 MHz ceramic resonator |
| Battery type | Coin‑cell lithium battery |
| Joystick connection | Port C pins 3‑7 and Port B pin 4 |
| Piezo speaker connection | Pin 17 – OC1C (PWM output) |
The DB101 can be powered from an external supply ranging from 1.8 V to 5.5 V.
The LCD is driven by an ATmega1281 AVR microcontroller.