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INA209 Software Overview
4.4.2 A/D Config Tab
Controls on this tab:
• Shunt voltage attenuator range (smallest range is 40mV, largest range is 320mV).
• Shunt voltage configuration—Resolution and number averages. Note that increasing the number of
averages will decrease noise, but will slow down the conversion rate.
• Bus voltage attenuator range (16V and 32V)—Note that the maximum bus voltage for the INA209 is
26V. Therefore, the 32V range cannot be fully used.
• Bus voltage configuration—Resolution and number averages. Note that increasing the number of
averages will decrease noise but will slow down the conversion rate.
• A/D converter mode—This control determines how the converters work. The most commonly used
mode is the shunt and bus continuous conversion mode. This mode causes both converters to run
continuously.
NOTE: More details on these options are explained in the INA209 data sheet and the data sheet
sections Register Details and Data Output Registers.
4.4.3 Calibrate Tab
The calibration tab allows users to enter some information regarding a specific INA209 configuration. This
information is used to compute the Full Scale Cal Register. The Full Scale Cal Register converts shunt
voltage to current voltage. The detailed mathematics behind this calibration feature are given in the
INA209 data sheet section, Calibration Register Scaling . Also, this feature is explained in a step-by-step
manner in the QuickStart Video .
4.4.4 Warning Tab
The warning tab allows you to completely configure the warning feature on the INA209. Specifically, there
are warning limit registers for Power, Bus Overvoltage, Bus Undervoltage, Shunt Voltage Positive, and
Shunt Voltage Negative. If an INA209 reading exceeds the value in a warning limit register, the INA209
warning will trip. Other options on the warning feature are also set on this tab (for instance, the delay,
polarity, latch enable, and output enable). See the
Warning/Watchdog Registers section of the INA209
data sheet .
4.4.5 Overlimit Tab
The overlimit tab allows you to completely configure the overlimit feature on the INA209. Specifically, there
are overlimit limit registers for Power, Bus Overvoltage, and Bus Undervoltage. If an INA209 reading
exceeds the value in a overlimit limit register, the INA209 overlimit will trip. Other options on the warning
feature are also set on this tab (for example, the delay, polarity, latch enable, and output enable). See the
Over-Limit/Critical Watchdog Registers section of the INA209 data sheet .
21 SBOU055A – February 2008 – Revised February 2010 INA209 Evaluation Module
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