2.1 Functional Safety Field Engagement Board
Overview
The Functional Safety Field Engagement Board (FSFEB) demonstrates some of the safety
and reliability features available on the tinyAVR 1-series devices. FSFEB is divided
into five main sections, and each section has LEDs that show the current status to the
user. All status LEDs, except for the four LEDs on the Operating Voltage section, are
connected to ATtiny3217, and they are updated using Charlieplexing. A separate application heartbeat LED is showing that
ATtiny3217 is operational and running the application. In addition, the application is
running Class B code to test various systems in order to
detect failures during start-up and run-time. To control the operating voltage of the
board, and the corresponding LEDs, FSFEB also features a board controller MCU. This MCU
is an ATtiny1617.Figure 2-1. Functional Safety Field
Engagement Board (FSFEB)
The core and various peripherals can run on a variety of clocks. Figure 2-3 shows how the system is clocked.
Figure 2-3. Clock System Overview
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