AN1012 datasheet(12/33 Pages) STMICROELECTRONICS

Part #	AN1012

Description	Predicting the battery life and data

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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12 / 33 page

TIMEKEEPER products

AN1012

12/33

Doc ID 6395 Rev 4

TIMEKEEPER products

TIMEKEEPER® products are very similar in construction and operation to ZEROPOWER®

products. However, they must be evaluated separately. The current drawn is highly

dependent not only on the temperature, but also on whether the oscillator is active. The

main components of TIMEKEEPER devices are (see Figure 5):

●

a CMOS RAM array;

●

voltage sense and switching circuitry;

●

an analog oscillator and clock chain;

●

a lithium power cell; and

●

a high-accuracy quartz crystal.

Figure 5.

Block diagram of a TIMEKEEPER® device

AI01383D

LITHIUM

CELL

OSCILLATOR AND

CLOCK CHAIN

VPFD

RST

VCC

VSS

32,768 Hz

CRYSTAL

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

16 x 8 BiPORT

SRAM ARRAY

8176 x 8

SRAM ARRAY

A0-A12

DQ0-DQ7

POWER

IRQ/FT

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