Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 254)

254

8209A–AVR–08/09

ATmega16M1/32M1/64M1

ATmega16M1/32M1/64M1 proposes to have an external resistor used in conjunction with the

Current Source. The device measures the voltage to the boundaries of the resistance via the

Analog to Digital converter. The resulting voltage defines the physical address that the commu-

nication handler will use when the node will participate in LIN communication.

In automotive applications, distributed voltages are very disturbed. The internal Current Source

solution of ATmega16M1/32M1/64M1 immunizes the address detection against any kind of volt-

age variations.

Note: 1. 5V range: Max R

load

30KΩ

3V range: Max R

load

15KΩ

Table 23-1. Example of Resistor Values(±5%) for a 8-address System (AVcc = 5V

(1)

)

Physical

Address

Resistor Value

load

(Ohm)

Minimum Voltage

Measured (V)

Typical Voltage

Measured (V)

Maximum Voltage

Measured (V)

0 1 000 0.1

1 2 200 0.22

2 3 300 0.33

3 4 700 0.47

4 6 800 0.68

5 10 000 1

6 15 000 1.5

7 22 000 2.2

Table 23-2. Example of Resistor Values(±1%) for a 16-address System (AVcc = 5V

(1)

)

Physical

Address

Resistor Value

load

(Ohm)

Minimum Voltage

Measured (V)

Typical Voltage

Measured (V)

Maximum Voltage

Measured (V)

0 2 000 0.2

1 2 400 0.24

2 2 700 0.27

3 3 300 0.33

4 3 900 0.39

5 4 700 0.47

6 5 600 0.56

7 6 800 0.68

8 8 200 0.82

9 9 100 0.91

10 11 000 1.1

11 13 000 1.3

12 16 000 1.6

13 18 000 1.8

14 20 000 2

15 24 000 2.4

1 2 ... 249 250 251 252 253 254 255 256 257 258 259 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 254

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