AN1012 datasheet(19/33 Pages) STMICROELECTRONICS

부품명	AN1012

상세설명	Predicting the battery life and data

PDF	33 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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19 / 33 page

AN1012

Supervisor products

Doc ID 6395 Rev 4

19/33

Supervisor products

STMicroelectronics also has a family of ZEROPOWER® and TIMEKEEPER® supervisor

devices. Supervisors are self-contained units that allow standard low-power SRAMs to be

turned into non-volatile memory devices. They monitor and provide VCC input for one or

more external SRAMs the same way ZEROPOWER and TIMEKEEPER products do. They

use a precision voltage reference and comparator to monitor the VCC input for going out-of-

tolerance.

When VCC becomes invalid, the supervisor’s conditioned chip-enable outputs (ECON) are

forced to their “inactive” state, thereby putting each external SRAM into its own write-protect

state. During the power failure, the supervisor provides the power for the SRAM from the

lithium cell within its SNAPHAT top. The supervisor switches the power source back to the

VCC supply as soon as the voltage returns to specified levels.

AN1012 데이터시트(PDF) 19 Page - STMicroelectronics