SLVAET3 October 2021 TPS8802
10-year battery life smoke alarm systems are becoming increasingly common in the industry, and the TPS8802 integrates the amplifiers, drivers, and regulators necessary to achieve a 10-year battery life with a single lithium battery. In this report, a smoke detection system and smoke and carbon monoxide (CO) detection system are designed using the TPS8802 with attention on the VCC, MCU, and LED supplies. The current consumption for each system is calculated based on the power configuration, system parameters, and measurement sequences. The calculation breaks down the power consumption block-by-block to further optimize the system. The two systems are built by modifying a TPS8802EVM and using a MSP430F5529 Launchpad to control the TPS8802. Measurements of the system current verify the accuracy of the power calculations. The required battery capacity for achieving a 10-year battery life is calculated from the system power consumption. The calculations show that a CR2 battery provides a 10-year life for a smoke alarm system using the TPS8802, and a CR123 battery provides a 10-year life for a smoke and CO alarm system using the TPS8802.