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AN3133 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN3133
Description  A real-time clock is a computer clock that keeps track of the current time
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3133 Datasheet(HTML) 25 Page - STMicroelectronics

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AN3133
RTC features summary
Doc ID 16956 Rev 5
25/43
4
RTC features summary
Table 16.
Summary of RTC features by product family
RTC features
Medium+ and High density
Medium density
Prescalers
Asynchronous 7 bits
Same
Synchronous
15 bit
13 bit
Bypass shadow
Available
Not available
Calendar
Time
– 12h/24h time format
– Hours
–Minutes
– Seconds
Same
Sub-seconds
– Sub-seconds
Not available
Date
–Weekday
–Date
–Month
–Year
Same
Daylight
operation
Add or subtract 1 hour to compensate
for daylight savings time.
Same
Wake-up unit
3 possible configurations for:
– Short period wakeup
– Medium period wakeup
– Long period wakeup
Same but less than high-
density products due to
additional Synchronous
Prescaler bits.
Alarm
Time
– 12h/24h time format
– Hours
–Minutes
– Seconds
Same
Sub-seconds
– Sub-seconds
Not available
Date
Date or Weekday
Same
Masks
Masks for time, date and sub-seconds
Masks for time and date only.
RTC
outputs
RTC_ALARM
pin
Depending on configuration, it can
deliver Alarm or WakeUp status.
Same
RTC_CALIB
pin
Depending on configuration, it can
deliver 1-Hz or 512-Hz signal.
512-Hz signal only
Tamper detection
– Configurable filter
– Configurable sampling frequency
– Configurable pins input precharge
duration
– Configurable sensitivity
Not available
Shift control
Add and subtract sub-seconds to
adjust the time.
Not available
Smooth calibration
Recalibrate the RTC clock for crystal
accuracy compensation.
Not available



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