INA219BIDCNT

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1. Describe

INA219BIDCNT is a current shunt and power monitor With I2C or SMBUS compatible interface. this The equipment monitors the shunt voltage drop and the bus at the same time Power supply voltage with programmable switching time And filtering. A programmable calibration value, Combined with the internal multiplier, you can achieve direct Current reading in amperes. additional The multiplication register calculates the power in watts. this I2C or SMBUS compatible interface characteristics 16 INA219 has two grades: A and B. The B-level version has higher accuracy and higher Precision specifications. INA219 can sense the shunt on the bus It varies from 0 to 26 V. INA219 is a digital current sense amplifier with I2C and SMBus compatible interface. It provides the current, voltage, and power readings needed to make accurate decisions in digital precision control systems. Programmable registers allow flexible configuration of measurement resolution and continuous anti-trigger operation. Detailed register information appears at the end of this data sheet. The device uses a single 3 to 5.5V power supply, maximum consumption of 1mA power supply current. The operating temperature range of INA219 is –40°C to 125°C.

2. Feature

    1. Detection of bus voltages from 0 to 26 V

    2. Report current, voltage and power

    3. 16 programmable addresses

    4. High accuracy: 0.5% (maximum) change with temperature (INA219B)

    5. Filtering options

    6. Calibration register

    7. SOT23-8 and SOIC-8 packages

3. Application

    1. Server

    2. Telecommunications equipment

    3. laptop

    4. Energy management

    5. charger

    6. Welding equipment

    7. power supply

    8. Test Equipment

4. Pin configuration

5. Pin function

6. Function description

The two analog inputs IN+ and IN– of the INA219 are connected to shunt resistors in the relevant bus. INA219 is usually powered by an independent power supply ranging from 3 to 5.5 V. The sensed bus can be from 0 to 26 V. There are no special considerations for power sequencing (for example, the bus voltage can be Appears when the power supply voltage is turned off, and vice versa). INA219 senses the small voltage drop on the shunt to shunt the voltage, and detects the voltage from IN– relative to ground to obtain the bus voltage. When the INA219 is in the normal operating mode (that is, the MODE bit of the configuration register is set to 111), it continuously converts the shunt voltage to the number set in the shunt voltage average function (Configuration register, SADC bit). Then the device converts the bus voltage to the digital voltage average set in the bus (configuration register, BADC bit). The mode control in the configuration register is also Allows the selection mode to only convert voltage or current, whether it is continuous conversion or in response to events (trigger). All current and power calculations are performed in the background and will not affect the conversion time; The conversion time shown in the electrical characteristics: can be used to determine the actual conversion time. The power-down mode reduces the quiescent current and shuts down the current entering the INA219 input, thereby avoiding any supply loss. It takes 40 μs to fully recover from a power failure. ADC shutdown mode (set by configuration register, MODE bit) stops all conversions. Write any triggered conversion mode to the configuration register (even if the required mode has been programmed into the register) to trigger a single conversion. Although INA219 can be read at any time, and the last converted data is still available, A conversion ready bit (status register, CNVR bit) is provided to help coordinate a one-time or trigger conversion. The conversion ready bit is set after all conversion, averaging, and multiplication operations are completed. The conversion ready bit is cleared under any of the following conditions:

    1. Write to the configuration register, unless the MODE bit is configured to power down or the ADC is off (Disabled) mode

    2. Read the status register

    3. Use the conversion pin to trigger a single conversion

7. Power Measurement

Current and bus voltage are converted at different points in time, depending on the resolution and averaging mode settings. For instance, when configured for 12-bit and 128 sample averaging, up to 68 ms in time between sampling these two values is possible. Again, these calculations are performed in the background and do not add to the overall conversion time.

8. PGA Function

If larger full-scale shunt voltages are desired, the INA219 provides a PGA function that increases the full-scale range up to 2, 4, or 8 times (320 mV). Additionally, the bus voltage measurement has two full-scale ranges: 16 or 32 V.

9. Programming

An important aspect of the INA219BIDCNT device is that it measure current or power if it is programmed based on the system. The device measures both the differential voltage applied between the IN+ and IN- input pins and the voltage at IN- pin. In order for the device to report both current and power values, the user must program the resolution of the Current Register (04h) and the value of the shunt resistor (RSHUNT) present in the application to develop the differential voltage applied between the input pins. Both the Current_LSB and shunt resistor value are used in the calculation of the Calibration Register value that the device uses to calculate the corresponding current and power values based on the measured shunt and bus voltages. After programming the Calibration Register, the Current Register (04h) and Power Register (03h) update accordingly based on the corresponding shunt voltage and bus voltage measurements. Until the Calibration Register is programmed, the Current Register (04h) and Power Register (03h) remain at zero.