#ina219

Raspberry piでできることはいろいろありますが、 電子部品には電流電圧を測定してなんぼという感じのセンサーもあります。 I2Cインターフェースがあればいいですが、ものによっては物理現象そのままという感じで Raspberry piには難しいものもあります。

一応0Vか3.3Vかは測れるみたいですが、いろいろ物足りません。

で、I2Cインターフェースを備えた電流センサを用意したらできることの幅が広がるのではとやってみました。

１つ１０００円もしなかった、INA219を使ってみました。

A few days ago, the instrument of Dezhou (TI) Claim to introduce a zero drift with I2C interface, bidirectional current / power and control the integrated circuit (IC) ,Have further strengthened TI energy-conserving electronic product camp. INA219 possesses the industry most high precision and most miniature size, not merely can control the pressure drop on the current divider resistor, detect the service voltage of current divider, the computable power at the same time. This device adopts SOT23 to capsulate, can offer the small-scale, low-cost solution for the fact that the server, notebook computer, power, battery management and digital electric current of the vehicle carried and telecommunication equipment detect.

INA219 can realize 1% of the precision of maximal error in the temperature range of +85C in - 40C, the deviation of maximum is 100 uV. The high precision of this product combines 12 advantages of definition, can help the pressure drop on customer's possible decrease current divider resistor, thus can reduce power loss and power consumption to the maximum extent, and save the board-level space. The bus line voltage range that this device can be detected is from 0 V to +26 V.

Other important characteristics of INA219 include:

• Programmable can normalize the register in the read current in units of ampere directly, and read the power by watt. • Can be to up to 128 more pieces of sample averaginging, in order to realize and filter under the environment of noise. • I2C interface is set up overtime, not only can prevent the bus line from being locked very much but also can offer the high-speed mode, meet the high Communication requirement up to 3.4 MHz. • All characteristic support software of INA219 is programmable. • Adopt the single power to supply power, its working voltage lies between between +5.5V +3.0.

Can consume MCU with MSP430 ultra low power of TI INA219 that optimize meticulously, various heat such as TPS2490 etc. plug control device and numerous TI power and manage collaborative work such as IC and controller. If want to find out about more details of the abundant serial products of power management about TI, please visit www.ti.com.cn/power, look over power management is chosen the guide.

Have already begun to supply now

A few days ago, the instrument of Dezhou (TI) Claim to introduce a zero drift with I2C interface, bidirectional current / power and control the integrated circuit (IC) ,Have further strengthened TI energy-conserving electronic product camp. INA219 possesses the industry most high precision and most miniature size, not merely can control the pressure drop on the current divider resistor, detect the service voltage of current divider, the computable power at the same time. This device adopts SOT23 to capsulate, can offer the small-scale, low-cost solution for the fact that the server, notebook computer, power, battery management and digital electric current of the vehicle carried and telecommunication equipment detect.

INA219 can realize 1% of the precision of maximal error in the temperature range of +85C in - 40C, the deviation of maximum is 100 uV. The high precision of this product combines 12 advantages of definition, can help the pressure drop on customer's possible decrease current divider resistor, thus can reduce power loss and power consumption to the maximum extent, and save the board-level space. The bus line voltage range that this device can be detected is from 0 V to +26 V.

Other important characteristics of INA219 include:

• Programmable can normalize the register in the read current in units of ampere directly, and read the power by watt. • Can be to up to 128 more pieces of sample averaginging, in order to realize and filter under the environment of noise. • I2C interface is set up overtime, not only can prevent the bus line from being locked very much but also can offer the high-speed mode, meet the high Communication requirement up to 3.4 MHz. • All characteristic support software of INA219 is programmable. • Adopt the single power to supply power, its working voltage lies between between +5.5V +3.0.

Can consume MCU with MSP430 ultra low power of TI INA219 that optimize meticulously, various heat such as TPS2490 etc. plug control device and numerous TI power and manage collaborative work such as IC and controller. If want to find out about more details of the abundant serial products of power management about TI, please visit www.ti.com.cn/power, look over power management is chosen the guide.

Have already begun to supply now