The INA209 is a high-side current shunt and power monitor with an I2C interface. The INA209 monitors both shunt drop and shunt bus voltage. A programmable calibration value, combined with an internal multiplier, enables direct readouts in amperes. An additional multiplying register calculates power in watts. The INA209 features two separate, onboard watchdog capabilities: a warning comparator and an over-limit comparator. The warning comparator is useful for monitoring lower warning limits and incorporates a user-defined delay. The over-limit comparator assists with monitoring upper limits that could require immediate system shutdown.

The INA209 also includes an analog comparator and a programmable digital-to-analog converter (DAC) that combine to provide the fastest possible responses to current overload conditions.

The INA209 can be used together with hot swap controllers that already use a current sense resistor. The INA209 full-scale range can be selected to be either within the hot-swap controller sense limits, or wide enough to include them.

The INA209 senses across shunts on buses that can vary from 0V to 26V. The device uses a single +3V to +5.5V supply, drawing a maximum of 1.5mA of supply current. It is specified for operation from -25°C to +85°C.

• SENSES BUS VOLTAGES FROM 0V TO +26V
• REPORTS CURRENT, VOLTAGE, AND POWER; STORES PEAKS
• TRIPLE WATCHDOG LIMITS:
  • Lower Warning with Delay
  • Upper Over-limit, No Delay
  • Fast Analog Critical
• HIGH ACCURACY: 1% MAX OVER TEMP
• APPLICATIONS
  • SERVERS
  • TELECOM EQUIPMENT
  • AUTOMOTIVE
  • POWER MANAGEMENT
  • BATTERY CHARGERS
  • WELDING EQUIPMENT
  • POWER SUPPLIES
  • TEST EQUIPMENT

I2C is a trademark of NXP Semiconductors. All other trademarks are the property of their respective owners.