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AN1012 데이터시트(PDF) 12 Page - STMicroelectronics

부품명 AN1012
상세설명  Predicting the battery life and data
PDF  33 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1012 데이터시트(HTML) 12 Page - STMicroelectronics

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TIMEKEEPER products
AN1012
12/33
Doc ID 6395 Rev 4
5
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
E
W
G
POWER
IRQ/FT



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