TIDUE59A May 2018 – September 2020
While measuring the power consumption of the CC3220S, the CC3220S and CC2640R2F LaunchPads were not stacked, to allow the devices to be powered separately. Instead, only the signals required for the NPI were connected between the boards using jumper wires. Resistor R141 on the CC3220S LaunchPad must also be removed. R141 is used to form a pull down on the input used by one of the CC3220S LaunchPad switches (SW2 on Rev. A). The resistor must be removed when measuring the power consumption on both the CC3220S and CC2640R2F LaunchPads, because the pin used by the switch is P4, which is used by the NPI and may increase power consumption while the NPI is idle (see Figure 3-12).
While powering the CC3220S LaunchPad from the DC power analyzer, the LaunchPad was configured according to the Battery Powering Only the CC3220 and U8 (Onboard Serial Flash) section of the CC3220 SimpleLink™ Wi-Fi® LaunchPad™ Development Kit Hardware User's Guide, and run standalone (flashed instead of the debugger), to let the power management policy for the MCU host stay enabled.
The power analyzer was configured with an output of 3.3-V DC while powering the CC3220S LaunchPad. A Netgear AT&T hotspot was used as the AP during the tests, with no other stations connected. Three different modes of operation that occur during normal application operation were measured, as follows:
When using the LaunchPad configuration from the Battery Powering Only the CC3220 and U8 (Onboard Serial Flash) section of the CC3220 SimpleLink™ Wi-Fi® LaunchPad™ Development Kit Hardware User's Guide, the back-channel UART is disconnected and debug prints are not available.