Before performing current consumption testing, the following board changes were made to ensure that the current consumption measurements did not include the components on the design that were mainly used for demonstration purposes and would not be implemented in a final system:
- BJT Q1, resistor R25, and resistor R15 were removed
- The individual LEDs on switches U1, U2, U3, and U4 were removed
After making these changes, the trigger design was powered from a DC power analyzer that would also measure the current consumption. The design was powered using one of the three options:
- Using the LDO with 5 V applied to its input
- Using the LDO with 18 V applied to its input
- Bypassing the LDO by removing it from the board and applying 3.3 V directly to VCC
The average current consumption was measured under the following conditions:
- Condition 1: All Hall sensors enabled
- Condition 2: Tamper Hall switch U3 disabled
- Condition 3: Tamper Hall switches U3 and U4 disabled
- Condition 4: Stray field switch U2, tamper Hall switch U3, and tamper Hall switch U4 disabled
- Condition 5: LDO, Stray field switch U2, tamper Hall switch U3, and tamper Hall switch U4 disabled.