The Si10xx/1x product family was developed to provide customers with a low system power solution to enable the longest possible battery lifetime. The Si10xx/1x family has low power consumption in active mode, sleep mode, and deep sleep modes. It is critical in low power applications to have highly flexible modes of operation in order to minimize the power consumption. The Si10xx/1x has low power modes in all three categories: active mode, 160µA/MHz; sleep mode, 600nA with a precision 32.768kHz RTC or 300nA with the internal LFO RTC; and deep sleep mode, 65nA with brown-out enabled and full RAM retention, or 25nA with brown-out disabled and full RAM retention. Because many of the target applications require frequent switching between inactive and active modes, it is critical to minimize the time and power needed to stabilize the internal clocks. The Si10xx/1x family can switch from a sub-µA sleep mode to the TX or RX mode in less than 1mS with one third the power required by competitors. Because this transition is repeated many times over the life of the application, this results in an extended battery life. Also, the RF power amp in the Si10xx/1x is designed to be efficient. For example, at 30mA, the Si1003 can deliver +13dBm of output power whereas competing devices deliver only +10dBm. This is 2.5x the output power given the same current consumption. Typically, a switch mode DC/DC converter is more efficient than a linear regulator. The Si1004/5/14/15 devices include a DC/DC boost converter designed to supply large loads with extremely high efficiency. In this mode, the power needed for periods of RF transmission and reception are supplied by the internal converter, with efficiencies of up to 90%. This increased efficiency means that more energy from the battery is used for the RF transaction rather than being lost as heat in the voltage regulation process. All of this translates into a 25% longer battery life with no sacrifice in microcontroller or radio performance. Additionally, the DC/DC converter is designed to operate down to 0.9V which makes it ideal for alkaline batteries. Alkaline batteries are approximately 20% as expensive as other battery chemistries with similar energy capacities. This is an enormous benefit for customers as they can not only increase battery life but also greatly reduce BOM cost. Nearly any application that has a battery replacement interval of less than seven years can derive immediate benefit from this innovative feature.