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INA219AIDCNRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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INA219AIDCNRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 37 page V = V - GND BUS IN- Range of 0V to 26V Typical Application 12V Data (SDA) 3.3V Supply Clock (SCL) ´ Power Register Current Register I C-/SMBUS- Compatible Interface 2 Voltage Register V IN+ V IN- ADC PGA INA219 GND A0 A1 V = V - V SHUNT IN+ IN- Typically < 50mV Supply Load - + INA219 Power-Supply Voltage 3V to 5.5V V S R SHUNT INA219 SBOS448G – AUGUST 2008 – REVISED DECEMBER 2015 www.ti.com Feature Description (continued) Figure 13. INA219 Configured for Shunt and Bus Voltage Measurement 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 8.3.1.1 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. 8.3.1.2 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. 8.3.1.3 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. 10 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: INA219 |
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