maximale Leistung!?

**DanielSan** · 25.07.2011, 12:13

Hi,

ich entwickel gerade eine kleine Schaltung mit mehreren Led´s. Ein Ausgang eines Atmels kann ja maximal 20mA treiben. Wieviel kann ich einem Atmel -in diesem Fall Atmega48/88/168- denn insgesamt zumuten? Ich habe schon im Datenblatt gesucht aber irgendwie finde ich die passende Stelle dazu nicht.

Danke
Gruß Daniel

**radbruch** · 25.07.2011, 12:23

Hallo

Im Datenblatt unter "Electrical Characteristics" steht in der Tabelle für die maximalen Ströme:

DC Current per I/O Pin ............................................... 40.0 mA
DC Current V CC and GND Pins................................ 200.0 mA

Und unter der Tabelle die maximalen Gruppenströme:

3. Although each I/O port can sink more than the test conditions (20 mA at V CC = 5V, 10 mA at V CC = 3V) under steady state
conditions (non-transient), the following must be observed:
ATmega48P/88P/168P:
1] The sum of all I OL , for ports C0 - C5, ADC7, ADC6 should not exceed 100 mA.
2] The sum of all I OL , for ports B0 - B5, D5 - D7, XTAL1, XTAL2 should not exceed 100 mA.
3] The sum of all I OL , for ports D0 - D4, RESET should not exceed 100 mA.
If I OL exceeds the test condition, V OL may exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test condition.
4. Although each I/O port can source more than the test conditions (20 mA at V CC = 5V, 10 mA at V CC = 3V) under steady state
conditions (non-transient), the following must be observed:
ATmega48P/88P/168P:
1] The sum of all I OH , for ports C0 - C5, D0- D4, ADC7, RESET should not exceed 150 mA.
2] The sum of all I OH , for ports B0 - B5, D5 - D7, ADC6, XTAL1, XTAL2 should not exceed 150 mA.
If II OH exceeds the test condition, V OH may exceed the related specification. Pins are not guaranteed to source current
greater than the listed test condition.

Gruß

mic