USA: Texas Instruments Inc. (TI) has introduced two tiny push-button reset controllers for space-constrained, power-sensitive applications such as pedometers, fitness bands, cell phones and tablets.
The dual-channel TPS3420 and TPS3421 feature low power consumption and a selectable reset time delay to improve system stability.
Push-button reset controllers are required for portable electronics with an embedded battery. In practice, the user presses and holds one or two external keys for a specific period of time, which turns the portable device off or generates a reset.
The TPS3420 and TPS3421 use a long input delay to provide the intended system reset and avoid reset from short push-button or key presses. This reset configuration enables differentiation between software interrupts and hard system resets. The timers are the first in a family of new push-button controllers from TI to ensure a hard and full system reset when needed to increase efficiency.