The 32KHz oscillator is on all the time by default on the SD card. In a typical application, the 32KHz clock would be provided by the host or a lower power 32KHz oscillator. The SD card provides a means of supplying an external 32KHz source to the module with a few simple changes to the resistor pop options. To provide an external clock source, remove R13 and move it to the R21 location. Remove R12 and provide a clock signal on J2 PIN 9. Once these MODs are made, only current to the module will be measured across J7.