Smart-reset chip

25 November 2009 Analogue, Mixed Signal, LSI

A new smart-reset chip developed by STMicroelectronics allows the target system to be restarted safely without removing the battery or finding a tool to push the reset button, which is usually hidden behind a hole in the casing. Mechanisms to overcome frozen devices are often less well developed than the main product features. Most manual reset keys, where provided, are hidden to prevent resetting the device accidentally. As these can be difficult to access, a popular ‘fix’ is to remove the battery. This can potentially damage the system, for example by causing critical data loss. The new STM65xx family of smart-reset ICs has two inputs that can be connected to two of the device’s normal function buttons. When these are held down for a certain time, which is programmable, the IC will send a reset signal to the main processor. The two inputs and programmable delay time allow a combination of button presses and hold-down times to guard against unintended resets.

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