The ADuC7028 evaluation board is a compact 2‑layer PCB (4 in × 5 in) that provides regulated 3.3 V power from a 9 V input, a 4‑pin UART header, a 20‑pin JTAG connector, and a 32.768 kHz watch crystal for the on‑chip PLL. It includes an ADR291 2.5 V external reference chip, push‑button controls, LEDs, and breakout headers for all analog and digital I/O.
The guide details the board's power supply connection, RS‑232 and emulation interfaces, crystal circuit, external reference options, DIP switch functions, and connector pinouts. It also provides a parts list, schematic, and a simple potentiometer demonstration circuit.
| PCB layers and size | 2‑layer, 4 in × 5 in |
|---|---|
| Input voltage | 9 V |
| Regulated output voltage | 3.3 V |
| UART header | 4‑pin |
| JTAG connector | 20‑pin standard |
| Watch crystal | 32.768 kHz |
| External reference chip | ADR291 2.5 V |
The board accepts a 9 V power supply connected via a 2.1 mm input power socket (J5).
A power LED (D3) lights up when a sufficient supply is present on the board.
Connector J1 provides the RS‑232 serial interface to a PC via a serial port cable.
All analog inputs and DAC outputs are available on the analog I/O connector J3.