ATmega16 power failure detection-EEWORLD

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ATmega16 has an on-chip BOD (Brown-out Detection) circuit that detects changes in VCC during operation by comparing it with a fixed trigger level. This trigger level is set by the fuse bit BODLEVEL, 2.7V (BODLEVEL not programmed), 4.0V (BODLEVEL programmed). The BOD trigger level has a hysteresis function to eliminate the impact of power spikes. This hysteresis function can be interpreted as VBOT+ = VBOT + VHYST/2 and VBOT- = VBOT- VHYST/2.

The switch of the BOD circuit is controlled by the fuse bit BODEN. When BOD is enabled (BODEN is programmed), once VCC drops below the trigger level (VBOT-, Figure 19), the BOD reset is immediately triggered. When VCC rises above the trigger level (VBOT+, Figure 19), the delay counter starts counting, and once the overflow time tTOUT is exceeded, the MCU resumes operation.

If VCC remains below the trigger level and remains as tBOD as shown in Table 15, the BOD circuit will only detect voltage drop.

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