TIDUF05 August 2022
The last measurements to take in regard to the power supplies on the camera module are the load currents for the system supply, and the load currents on the AR0820 imager. These measurements verify total power consumption of the camera module as well as the load current for each individual rail on the AR0820 imager. For the following test data, each rail is drawing the specific load current outlined for the serializer and imager. All load current measurements are taken while a video output stream is present.
Table 3-1 displays the currents measured through each supply voltage in this reference design. The 12-V load current is the total input load for the camera module and measures at 107 mA. The total power consumption corresponds to an overall system efficiency of 70%, close to the 75% value derived in Section 2.4. The difference can be attributed to lower operating currents than expected, as well as conduction losses in the POC cable and filters.
VOLTAGE RAIL | MEASURED CURRENT |
---|---|
12 V | 103 mA |
3.3 V | 320 mA |
2.8 V | 120 mA |
1.8 V | 193 mA |
1.2 V | 155 mA |