OLIMEXINO-85BC Development Board Schematic
Schematic for the OLIMEXINO-85BC, an ATtiny85-based development board featuring USB connectivity, a Li-Po battery charger, and 3.3V/5V selectable power options.
Overview
The OLIMEXINO-85BC schematic illustrates a compact development board based on the Microchip ATtiny85-20SU microcontroller. The circuit integrates a Microchip MCP73812T-420I/OT lithium battery charger configured for a 70mA charge current and an Advanced Power Electronics AP1231-3.3V regulator for voltage management. The design includes a Mini-USB interface with BZV55C3V6 Zener diodes for signal protection, an IRLML6402 P-channel MOSFET for power path control, and selectable 3.3V/5V logic levels via jumpers. Additional components include a reset button and status LEDs for power and charging indication.
Use Cases
- Portable USB-powered microcontroller projects
- Low-power ATtiny85 embedded system design
- Li-Po battery-operated electronics
- Prototyping compact wearable devices
Topics
Referenced Parts
IRLML6402
Infineon
IRLML6402
BZV55C3V6
Nexperia
BZV55C3V6/SOD80C
AP1231-3.3V
Advanced Power Electronics Corp
AP1231-3.3V(SOT23-5)
IT1185AU2
ITT Industries
IT1185AU2
| ATTINY85-20SU | Microchip | ATTINY85-20SU+(HR1x8) |
| MCP73812T-420I/OT | Microchip | MCP73812T-420I/OT |
| 1N5819 | Stmicroelectronics | 1N5819(S4SOD-123) |
| IRLML6402 | Infineon | IRLML6402 |
| BZV55C3V6 | Nexperia | BZV55C3V6/SOD80C |
| AP1231-3.3V | Advanced Power Electronics Corp | AP1231-3.3V(SOT23-5) |
| IT1185AU2 | ITT Industries | IT1185AU2 |