TIDUEO0C July 2019 – March 2021
The resistors R25 and R28 in the TIDA-01546 reference design are used to set the gain value of the LPV521 device:
The AVDD voltage of the ADS7142 device defines the full-scale input range of the device and for the TIDA-01546 design, it is set to 3.3 V and is the maximum input voltage. With this, and knowing the gain G, calculate the maximum VIN value for the input voltage of the LPV521 device:
The 69 mV represents the full-scale voltage which can be applied to the input of the LPV521 device regardless of the current range used.
For these two current ranges, the maximum current value is one of the following:
The minimal current values are enumerated in the following, since there are 4096 ADC steps:
The LPV521 and ADS7142 devices monitor the system current continuously with a minimum power consumption, since both devices draw about 1 µA when running from a 3.3-V supply.