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FM3808 Arkusz danych(PDF) 7 Page - Ramtron International Corporation

Numer części FM3808
Szczegółowy opis  256Kb Bytewide FRAM w/ Real-Time Clock
Download  27 Pages
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Producent  RAMTRON [Ramtron International Corporation]
Strona internetowa  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3808 Arkusz danych(HTML) 7 Page - Ramtron International Corporation

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Page 7 of 27
system power fails, the VDD voltage will drop. When
it crosses the voltage on the VBAK supply pin, the
clock/calendar power will switch to the backup power
supply VBAK. The supervisor function, described
below, controls the switchover process as part of a
more complete power management circuit.
The following functions are powered from the backup
power source when VDD < VBAK (backup mode) :
• Clock/calendar core
• Alarm interrupt/comparator
• INT pin (determined by ABE & AIE bits);
active low only
• Flags connected to related functions
The following functions are not powered and are
disabled when VDD < VLO :
• User interface
• Watchdog timer
• Power monitor & band-gap (V
DD < ≈ 2.0V)
• Flags connected to related functions
• All FRAM access & updates
• Calibration operation
• INT pin if programmed as active-high
32.768 kHz
crystal
Oscillator
Clock
Divider
Update
Logic
32 Hz
512 Hz
W
R
Seconds
7 bits
Minutes
7 bits
Hours
6 bits
Date
6 bits
Months
5 bits
Years
8 bits
CF
Days
3 bits
User Interface Registers
1 Hz
Figure 2. Real-Time Clock Core Block Diagram


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