36
2543L–AVR–08/10
ATtiny2313
Note:
1. VBOT may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to VCC = VBOT during the production test. This guar-
antees that a Brown-Out Reset will occur before VCC drops to a voltage where correct
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 110 for ATtiny2313V and BODLEVEL = 101 for ATtiny2313L.
When the BOD is enabled, and VCC decreases to a value below the trigger level (VBOT- in Figure 18), the Brown-out Reset is immediately activated. When VCC increases above the trigger level (VBOT+ in Figure 18), the delay counter starts the MCU after the Time-out period tTOUT has expired.
The BOD circuit will only detect a drop in VCC if the voltage stays below the trigger level for lon-
Figure 18. Brown-out Reset During Operation
011
Reserved
010
001
000
Table 17. Brown-out Characteristics
Symbol
Parameter
Min
Typ
Max
Units
VHYST
Brown-out Detector Hysteresis
50
mV
tBOD
Min Pulse Width on Brown-out Reset
2
ns
Table 16. BODLEVEL Fuse Coding(1)
BODLEVEL 2..0 Fuses
Min VBOT
Typ VBOT
Max VBOT
Units
VCC
RESET
TIME-OUT
INTERNAL
RESET
VBOT-
VBOT+
tTOUT