利用Arduino做项目的时候，经常会纠结于其驱动能力，或者无法正常工作，或者浪费人力财力，下面就是关于这部分的官方内容：
缩写定义:
VOH - 电压输出高电平Voltage Output High (I/O Pin "HIGH")
VOL - 电压输出低电平Voltage Output Low (I/O Pin " LOW")
IOH - 电流输出高电平Current Output High (I/O Pin "HIGH")
IOL - 电流输出低电平Current Output Low (I/O Pin " LOW")
1. ATMEL ATMEGA328 (UNO及Duemilanove) 电流规范:
极限参数- 超过端口将无法承受
IO通道对应的直流电流........... 40.0 mA
VCC和GND对应的直流电流...... 200.0 mA
1 VCC管脚: 总的拉电流(流出)能力为200mA
2 GND管脚: 总的灌电流(流入)能力为400mA
Only the 32 pin surface mount packages (UNO Surface-Mount version) have 2 VCC pins.
管脚拉电流能力：
NOTE: Although each I/O port can source more than the test conditions (20 mA at VCC = 5V, 10 mA at VCC = 3V) under steady state conditions (non-transient), the following must be observed.
The sum of all IOH, for ports C0 - C5, D0- D4, ADC7, RESET should not exceed 150 mA.
The sum of all IOH, for ports B0 - B5, D5 - D7, ADC6, XTAL1, XTAL2 should not exceed 150 mA.
If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current greater than the listed test condition.
Pin SINK Current Limitations:
NOTE: Although each I/O port can sink more than the test conditions (20 mA at VCC = 5V, 10 mA at VCC = 3V) under steady state conditions (non-transient), the following must be observed:
The sum of all IOL, for ports C0 - C5, ADC7, ADC6 should not exceed 100 mA.
The sum of all IOL, for ports B0 - B5, D5 - D7, XTAL1, XTAL2 should not exceed 100 mA.
The sum of all IOL, for ports D0 - D4, RESET should not exceed 100 mA.
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test condition.
2. ATMEL ATMEGA2560-1280-640(MEGA) 电流规范:
极限参数:
IO通道对应的直流电流........... 40.0 mA
VCC和GND对应的直流电流...... 200.0 mA
This apparently is saying you get 800mA to play with as there are 4 Vcc and 4 Gnd pins, further limited by subgroups of pins for Sink (IOL) and Source (IOH) current:
管脚灌电流能力:
The sum of all IOL, for ports J0-J7, A0-A7, G2 should not exceed 200 mA.
The sum of all IOL, for ports C0-C7, G0-G1, D0-D7, L0-L7 should not exceed 200 mA.
The sum of all IOL, for ports G3-G4, B0-B7, H0-B7 should not exceed 200 mA.
The sum of all IOL, for ports E0-E7, G5 should not exceed 100 mA.
The sum of all IOL, for ports F0-F7, K0-K7 should not exceed 100 mA.
[looks like 800mA Total!]
NOTE: If IOL exceeds the test condition [(20mA at VCC = 5V, 10mA at VCC = 3V) under steady state conditions (non-transient)], VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test condition.
管脚拉电流能力:
The sum of all IOH, for ports J0-J7, G2, A0-A7 should not exceed 200 mA.
The sum of all IOH, for ports C0-C7, G0-G1, D0-D7, L0-L7 should not exceed 200 mA.
The sum of all IOH, for ports G3-G4, B0-B7, H0-H7 should not exceed 200 mA.
The sum of all IOH, for ports E0-E7, G5 should not exceed 100 mA.
The sum of all IOH, for ports F0-F7, K0-K7 should not exceed 100 mA.
[looks like 800mA Total!]
NOTE: If IOH exceeds the test condition [(20mA at VCC = 5V, 10mA at VCC = 3V) under steady state conditions (non-transient)], VOH may exceed the related specification. Pins are not guaranteed to source current greater than the listed test condition.
NOTE: Crossroads has confirmed with ATMEL that total current is defined by the number of VCC pins per package. Here is a quote from their response:
"For 328P, the max current rating is 400mA for the TQFP package. For ATmega2560, the max current rating is 800 mA. Also, please note that this is absolute maximum rating and exposing the device to absolute maximum conditions for longer duration of time could possibly cause damage to the device."
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