ATtiny261A datasheet(187/292 Pages) ATMEL

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187

8197A–AVR–10/09

ATtiny261A/461A/861A

19.5 System and Reset Characteristics

Notes: 1. Not tested. Values are guidelines, only.

19.5.1

Enhanced Power-On Reset

Note:

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 VPOA.

19.5.2

Brown-Out Detection

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.

Table 19-4.

Reset, Brown-out, and Internal Voltage Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

VRST

RESET Pin Threshold Voltage (1)

0.2 VCC

0.9 VCC

tRST

Min pulse width on RESET Pin (1)

VCC = 3V

2.5

µs

VHYST

Brown-out Detector Hysteresis (1)

tBOD

Min Pulse Width on

Brown-out Reset (1)

2µs

VBG

Internal bandgap voltage

VCC = 2.7V

TA = 25°C

1.0

1.1

1.2

tBG

Internal bandgap start-up time (1)

VCC = 5V

TA = 25°C

µs

IBG

Internal bandgap reference

current consumption (1)

VCC = 5V

TA = 25°C

µA

Table 19-5.

Characteristics of Enhanced Power-On Reset. T

A = -40 – 85°C

Symbol

Parameter

Min(1)

Typ(1)

Max(1)

Units

VPOR

Release threshold of power-on reset (2)

1.1

1.4

1.6

VPOA

Activation threshold of power-on reset (3)

0.6

1.3

1.6

SRON

Power-On Slope Rate

0.01

V/ms

Table 19-6.

BODLEVEL Fuse Coding(1)

BODLEVEL [2:0] Fuses

Min VBOT

Typ VBOT

Max VBOT

Units

111

BOD Disabled

110

1.7

1.8

2.0

101

2.5

2.7

2.9

100

4.1

4.3

4.5

0XX

Reserved

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