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INA219 Datasheet Download Texas Instrument

INA219 Datasheet 

INA219 Datasheet Download Texas Instrument - The INA219 is a digital current sense amplifier with an I2C- and SMBus-compatible interface. It provides digital current, voltage, and power readings necessary for accurate decision-making in precisely-controlled systems.

Features INA219

  • Senses Bus Voltages from 0 to 26 V
  • Reports Current, Voltage, and Power
  • 16 Programmable Addresses
  • High Accuracy: 0.5% (Maximum) Over
  • Temperature (INA219B)
  • Filtering Options
  • Calibration Registers
  • SOT23-8 and SOIC-8 Packages

Applications INA219

  • Servers
  • Telecom Equipment
  • Notebook Computers
  • Power Management
  • Battery Chargers
  • Welding Equipment
  • Power Supplies
  • Test Equipment

INA219 PinOut



Description

Programmable registers allow flexible configuration for measurement resolution as well as continuous-versustriggered operation. Detailed register information appears at the end of this data sheet, beginning with Table 2.

See the Functional Block Diagram section for a block diagram of the INA219 device.

INA219 Datasheet Download Texas Instrument


The two analog inputs to the INA219, IN+ and IN–, connect to a shunt resistor in the bus of interest. The INA219 is typically powered by a separate supply from 3 to 5.5 V. The bus being sensed can vary from 0 to 26 V. There are no special considerations for power-supply sequencing (for example, a bus voltage can be present with the supply voltage off, and vice-versa). The INA219 senses the small drop across the shunt for shunt voltage, and senses the voltage with respect to ground from IN– for the bus voltage. Figure 13 shows this operation.

When the INA219 is in the normal operating mode (that is, MODE bits of the Configuration register are set to 111), it continuously converts the shunt voltage up to the number set in the shunt voltage averaging function (Configuration register, SADC bits). The device then converts the bus voltage up to the number set in the bus voltage averaging (Configuration register, BADC bits). The Mode control in the Configuration register also permits selecting modes to convert only voltage or current, either continuously or in response to an event (triggered).

All current and power calculations are performed in the background and do not contribute to conversion time; conversion times shown in the Electrical Characteristics: can be used to determine the actual conversion time. Power-Down mode reduces the quiescent current and turns off current into the INA219 inputs, avoiding any supply drain. Full recovery from Power-Down requires 40 μs. ADC Off mode (set by the Configuration register, MODE bits) stops all conversions.

Writing any of the triggered convert modes into the Configuration register (even if the desired mode is already programmed into the register) triggers a single-shot conversion. Table 6 lists the triggered convert mode settings.

INA219 Datasheet Download Texas Instrument

Although the INA219 can be read at any time, and the data from the last conversion remain available, the conversion ready bit (Status register, CNVR bit) is provided to help coordinate one-shot or triggered conversions.

The conversion ready bit is set after all conversions, averaging, and multiplication operations are complete.

The conversion ready bit clears under any of these conditions:

  • Writing to the Configuration register, except when configuring the MODE bits for power down or ADC off (disable) modes
  • Reading the Status register
  • Triggering a single-shot conversion with the convert pin

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.


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.


Compatibility With TI Hot Swap Controllers

The INA219 is designed for compatibility with hot swap controllers such the TI TPS2490. The TPS2490 uses a high-side shunt with a limit at 50 mV; the INA219 full-scale range of 40 mV enables the use of the same shunt for current sensing below this limit. When sensing is required at (or through) the 50-mV sense point of the TPS2490, the PGA of the INA219 can be set to /2 to provide an 80-mV full-scale range.


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