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Davood Amerion
Joined: 01 Mar 2005
Posts: 589
Helped: 90
Location: Persia
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 18 Jul 2005 7:36 atmega8 output current |
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Hi everybody;
I am using ATMEGA16L for STEPPER motor control. Port A and port D which i use az output, unable to produce enough current, say 10mA. The output current is as low as 200uA!
whats wrong?
Last edited by Davood Amerion on 18 Jul 2005 7:56; edited 1 time in total |
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IanP
Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
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18 Jul 2005 7:51 atmega32 output current |
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Most of microcontrollers have only very weak pull-ups at their ports, so to source current you will need a buffer.
However, the outputs should be able to sink ≈10mA..
Regards,
IanP
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Davood Amerion
Joined: 01 Mar 2005
Posts: 589
Helped: 90
Location: Persia
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18 Jul 2005 8:04 atmega current port |
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dear IanP;
This type of microcontroller capable to driving min. 10mA and I configure output as totem pole (PORTA reg. and DDRA reg.). I think the problem is in software, but i dont now where!
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18 Jul 2005 8:04 Ads |
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bamdad
Joined: 14 Nov 2001
Posts: 116
Helped: 5
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18 Jul 2005 10:06 atmega8 source current |
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| Maybe the micro is damaged, I have an AtMega16 (not the L version) which is driving 30mA on one of its port pins (port A I think)
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Davood Amerion
Joined: 01 Mar 2005
Posts: 589
Helped: 90
Location: Persia
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18 Jul 2005 10:14 atmega outputs |
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I found answer. i define init() function but I dont use it!
anyway;
Thank you for your attention.
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Bingo600
Joined: 26 Aug 2004
Posts: 239
Helped: 14
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19 Jul 2005 21:44 atmega16 current output |
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Remember on most Atmega's
The Port A (ADC) gets it Power from AVCC (even if used as a normal pin) so you always need to connect AVCC & AGND.
Remember decoupling caps
/Bingo
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