アプリケーションノート 3476

Adding Battery-Detection Functionality to the DS1312, DS1314, and DS1321 Controller ICs


要約: The DS1312, DS1314, and DS1321 are nonvolatile controller ICs that have a built-in battery-voltage monitor. The monitor measures the voltage of a lithium cell connected to the VBAT pin and issues a warning when the battery voltage is low. The battery voltage is measured once during power-up and once every 24 hours thereafter. As long as a battery is attached to the VBAT pin, the device operates properly. However, if the battery is removed and the VBAT pin is left floating, erroneous battery-voltage measurements might be made, depending on the value of the floating VBAT voltage. This application note describes how to add battery-detection functionality to the DS1312, DS1314, and DS1321 devices.