TIDUEO0C July 2019 – March 2021
The second relevant subsystem of the TIDA-01546 reference design uses the ADS7142 nanopower SAR ADC device, which can measure both a low-current range with 0–10 µA and a high-current range with 0–476 mA current. The range selection is deliberately made, as typically in ultra-low power metrology mode a smart flow meter device uses less than 10 µA average current. The second range for up to 476 mA is used when the smart meter or IoT application is running an NB-IoT communication (or any other wireless communication with the corresponding current profile, for example wM-Bus N-mode transmission in 169 MHz band with up to +25 dBm). These two current profile ranges align quite well with the data sheet values for power-saving mode and active mode for both NB-IoT modules described in Section 2.4.3 and in Section 2.4.4.