attiny25v ATMEL Corporation, attiny25v Datasheet - Page 171

• Manufacturer Part Number: attiny25v
• Description: Microcontroller With 2/4/8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

21.5.2
21.6
2586K–AVR–01/08
Brown-Out Detection
Enhanced Power-On Reset
This implementation of power-on reset exists in newer versions of ATtiny25/45/85. The table
below describes the characteristics of this power-on reset and it is valid for the following devices,
only:
Table 21-6.
Note:
Table 21-7.
Note:
• ATtiny25, revision E, and newer
• ATtiny45, revision G, and newer
• ATtiny85, revision C, and newer
Symbol
V
SR
V
POR
POA
ON
BODLEVEL [2:0] Fuses
1. Values are guidelines, only
2. Threshold where device is released from reset when voltage is rising
3. The Power-on Reset will not work unless the supply voltage has been below V
1. V
this is the case, the device is tested down to V
antees that a Brown-out Reset will occur before V
operation of the microcontroller is no longer guaranteed.
Parameter
Release threshold of power-on reset
Activation threshold of power-on reset
Power-On Slope Rate
BOT
Characteristics of Enhanced Power-On Reset.
BODLEVEL Fuse Coding
0XX
may be below nominal minimum operating voltage for some devices. For devices where
111
110
101
100
Min
1.7
2.5
4.1
(1)
(2)
(3)
CC
= V
CC
Typ
1.8
2.7
4.3
drops to a voltage where correct
BOT
BOD Disabled
Min
(1)
0.01
T
Reserved
1.1
0.6
during the production test. This guar-
A
(1)
= -40 - 85°C
ATtiny25/45/85
Typ
1.4
1.3
Max
(1)
2.0
2.9
4.5
(1)
Max
1.6
1.6
POT
(1)
(falling)
Units
Units
V/ms
V
V
V
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