When the nSLEEP pin is low, the device enters a low-power sleep mode. In sleep mode, all the internal MOSFETs, the DVDD regulator, SPI and the charge pump is disabled. The tSLEEP time must elapse after a falling edge on the nSLEEP pin before the device enters sleep mode. The device is brought out of sleep automatically if the nSLEEP pin is brought high. The tWAKE time must elapse before the device is ready for inputs.