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FM3164-GTR Fiches technique(PDF) 8 Page - Cypress Semiconductor

No de pièce FM3164-GTR
Description  64-Kbit/256-Kbit Integrated Processor Companion with F-RAM
Download  33 Pages
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Fabricant  CYPRESS [Cypress Semiconductor]
Site Internet  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM3164-GTR Fiches technique(HTML) 8 Page - Cypress Semiconductor

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FM3164/FM31256
Document Number: 001-86391 Rev. *C
Page 8 of 33
Backup Power
The real-time clock/calendar is intended to be permanently
powered. When the primary system power fails, the voltage on
the VDD pin will drop. When VDD is less than 2.5 V, the RTC (and
event counters) will switch to the backup power supply on VBAK.
The clock operates at extremely low current in order to maximize
battery or capacitor life. However, an advantage of combining a
clock function with F-RAM memory is that data is not lost
regardless of the backup power source.
The IBAK current varies with temperature and voltage (see DC
Electrical Characteristics table). The following graph shows IBAK
as a function of VBAK. These curves are useful for calculating
backup time when a capacitor is used as the VBAK source.
The minimum VBAK voltage varies linearly with temperature. The
user can expect the minimum VBAK voltage to be 1.23 V at
+85 °C and 1.90 V at -40 °C. The tested limit is 1.55 V at +25 °C.
Note The minimum VBAK voltage has been characterized at
-40 °C and +85 °C but is not 100% tested.
Trickle Charger
To facilitate capacitor backup the VBAK pin can optionally provide
a trickle charge current. When the VBC bit (register 0Bh, bit 2) is
set to ‘1’, the VBAK pin will source approximately 15 µA until VBAK
reaches VDD or 3.75 V, whichever is less. In 3 V systems, this
charges the capacitor to VDD without an external diode and
resistor charger. In 5 V systems,
it
provides
the
same
convenience and also prevents the user from exceeding the
VBAK maximum voltage specification.
Figure 7. Real-time Clock Core Block Diagram
 
32.768 kHz
crystal
 
Oscillator
 
Clock
Divider
 
 
Update
Logic
 
 
512 Hz or
Square Wave
 
Seconds
7 bits
 
 
MInutes
7 bits
 
 
Hours
6 bits
 
 
Date
6 bits
 
 
Months
5 bits
 
 
Years
8 bits
 
 
 
Days
3 bits
 
 
User Interface Registers
 
1 Hz
 
 
W
R
OSCEN
CF
Figure 8. IBAK vs. VBAK Voltage
VBAK (V)
Figure 9. VBAK(min.) vs Temperature
Temperature (°C)


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