Datasheet

189
7728G–AVR–06/10
ATtiny87/ATtiny167
In automotive applications, distributed voltages are very disturbed. The internal Current
Source solution of ATtiny87/167 immunizes the address detection the against any kind of volt-
age variations.
Note: 1. 5V range: Max R
load
30KΩ
3V range: Max R
load
15KΩ
Table 16-1. Example of Resistor Values(±5%) for a 8-address System (AVcc = 5V
(1)
)
Physical
Address
Resistor Value
R
load
(Ohm)
Typical Measured
Voltage (V)
Minimum
Reading with
a 2.56V ref
Typical
Reading with
a 2.56V ref
Maximum
Reading with
a 2.56V ref
0 1 000 0.1 40
1 2 200 0.22 88
2 3 300 0.33 132
3 4 700 0.47 188
4 6 800 0.68 272
5 10 000 1 400
6 15 000 1.5 600
7 22 000 2.2 880
Table 16-2. Example of Resistor Values(±1%) for a 16-address System (AVcc = 5V
(1)
)
Physical
Address
Resistor Value
R
load
(Ohm)
Typical Measured
Voltage (V)
Minimum
Reading with
a 2.56V ref
Typical
Reading with
a 2.56V ref
Miximum
Reading with
a 2.56V ref
01 000 0.1 384045
1 1 200 0.12 46 48 54
2 1500 0.15 57 60 68
3 1800 0.18 69 72 81
4 2200 0.22 84 88 99
5 2700 0.27 104 108 122
6 3300 0.33 127 132 149
7 4700 0.47 181 188 212
8 6 800 0.68 262 272 306
9 8 200 0.82 316 328 369
10 10 000 1.0 386 400 450
11 12 000 1.2 463 480 540
12 15 000 1.5 579 600 675
13 18 000 1.8 694 720 810
14 22 000 2.2 849 880 989
15 27 000 2.7 1023 1023 1023