Datasheet

250
ATtiny828 [DATASHEET]
8371A–AVR–08/12
Table 105. Calibration Accuracy of Internal 32kHz Oscillator
24.4.3 External Clock Drive
Figure 102. External Clock Drive Waveform
Table 106. External Clock Drive Characteristics
24.5 System and Reset Characteristics
Table 107. Reset and Internal Voltage Characteristics
Note: 1. Values are guidelines, only
Calibration
Method Target Frequency V
CC
Temperature Accuracy
Factory
Calibration
32kHz 1.7 – 5.5V -40°C to +85°C ±30%
Symbol Parameter
V
CC
= 1.7 – 5.5V V
CC
= 2.7–5.5V V
CC
= 4.5–5.5V
UnitMin. Max. Min. Max. Min. Max.
1/t
CLCL
Clock Frequency 0 4 0 8 0 12 MHz
t
CLCL
Clock Period 250 125 83 ns
t
CHCX
High Time 100 40 20 ns
t
CLCX
Low Time 100 40 20 ns
t
CLCH
Rise Time 2.0 1.6 0.5 μs
t
CHCL
Fall Time 2.0 1.6 0.5 μs
Δt
CLCL
Period change from one clock cycle to next 2 2 2 %
V
IL1
V
IH1
Symbol Parameter Condition Min
(1)
Typ
(1)
Max
(1)
Units
V
RST
RESET Pin Threshold Voltage 0.2 V
CC
0.9V
CC
V
V
BG
Internal bandgap voltage
V
CC
= 2.7V
T
A
=25°C
1.0 1.1 1.2 V
t
RST
Minimum pulse width on RESET
Pin
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
2000
700
400
ns