6 Summary

This application note describes a cost-efficient, low-power 2-chip design that can be used to accelerate the design of a smoke alarm meeting the requirements of new UL standards. The test results show the ability of this design to detect and the potential to distinguish between sources of real smoke and nuisance sources.

While the design presented in this report is meant for demo purposes, the note provides the foundation in terms of base software routines and configuration, and hardware, to be able to implement more sophisticated algorithms with designed for photoelectric chamber configuration and signal chain parameters needed for full agency compliance.

Other considerations for the 2-chip design presented is in the flexibility of the selection of the MCU as the only requirements are an ADC with the required resolution and sample rate, an I2C interface, the appropriate number of GPIO’s for the application, and the amount of memory space needed to run the algorithms. While the MSPM0L1306 is used for the design shown in this report, the even lower cost MSPM0C device can be used. Additionally, if the need for GPIO’s is low, the MSPM0L series is offered in a small package size 16WQFN with is only 3 mm × 2 mm. These are just a couple examples illustrating the flexibility of TI’s new family of MSPM0 Arm-based micro controllers.