Current of mbed

The current consumption of mbed was measured.

Measurement condition

• Input voltage: 5V(Supply it from self power USB hub to VIN of mbed).
• The test environment: LED of four every five seconds is lit one by one. This is repeated.
• It takes the average measuring it five times.

TestProgram

mbedCurrentTest

Measurement result

times LED Lighting none LED 1 Lighting LED 2 Lighting LED 3 Lighting LED 4 Lighting 1 139.10 141.20 143.10 145.10 146.90 2 139.10 141.30 143.20 145.00 146.90 3 139.10 141.20 143.10 145.10 147.00 4 139.00 141.30 143.20 145.10 147.10 5 139.10 141.20 143.10 145.00 146.90 average 139.08 141.24 143.14 145.06 146.96 diff 2.16 1.9 1.92 1.9

Unit:mA

Understood thing

• When LED is not lit at all, the current consumption of mbed is about 139.10mA.
• When all of the four LED on the mbed substrate is lit, current consumption is about 147mA.
• Current consumption goes up by about 2mA at the time of each lighting LED 1 piece.

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日本語(Japanese)

mbed の消費電流を測定してみました。

測定条件

• 入力電圧：5V(セルフパワー USB ハブから、mbed のVINへ供給)
• テスト環境：５秒おきに、４つのLEDを一つずつ点灯していくの繰り返し。
• ５回測定し、平均を取る。

テストプログラム

mbedCurrentTest

測定結果

回数 LED無灯火 LED点灯１個 LED点灯２個 LED点灯３個 LED点灯４個 1 139.10 141.20 143.10 145.10 146.90 2 139.10 141.30 143.20 145.00 146.90 3 139.10 141.20 143.10 145.10 147.00 4 139.00 141.30 143.20 145.10 147.10 5 139.10 141.20 143.10 145.00 146.90 平均 139.08 141.24 143.14 145.06 146.96 差分 2.16 1.9 1.92 1.9

単位はmA

分かること

• LED無灯火の場合の mbed 消費電流は約 139.10mA
• mbed 基板にある４個の LED 全てを点灯させると、消費電流は約147mA
• LED１個の点灯につき、約2mA程度消費電流が上がる。

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