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RS5C372A-E2-F Datasheet(PDF) 19 Page - RICOH electronics devices division

Part No. RS5C372A-E2-F
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RS5C372A-E2-F Datasheet(HTML) 19 Page - RICOH electronics devices division

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RS5C372A/B
18
2.1-4 CT2, CT1, CT0
Periodic interrupt cycle select bit
CT2 CT1 CT0
Description
Wave Form Mode
Cycle and Falling Timing
0
0
0
off (“H”)
(Default)
0
0
1
Fixed at “L”
0
1
0
Pulse Mode
2Hz (Duty50%)
0
1
1
Pulse Mode
1Hz (Duty50%)
1
0
0
Level Mode
Every second (synchronized with second count up)
1
0
1
Level Mode
Every minute (00 second of every minute)
1
1
0
Level Mode
Every hour (00 minute(s) 00 second(s) of every hour)
1
1
1
Level Mode
Every month (the 1st day 00 A.M. 00 minute(s) 00 second(s) of every month)
1) Pulse mode : Outputs 2Hz, 1Hz clock pulses. For relationships with counting up of seconds see the diagram
below.
) When 32.000kHz crystal is used,
In the 2Hz clock pulse mode, 0.496s clock pulses and 0.504s clock pulse are output alternately.
Duty cycle for 1Hz clock pulses becomes 50.4% (“L” duration is 0.496s while “H” duration is 0.504s).
2) Level mode : One second, one minute or one month may be selected for an interrupt cycle.
Counting up of seconds is matched with falling edge of interrupt output.
3) When the time trimming circuit is used, periodic interrupt cycle changes every 20 seconds.
Pulse mode : “L” duration of output pulses may change in the maximum range of
3.784ms
(
3.875ms when 32.000kHz crystal is used.)
For example, Duty will be 50
0.3784% (or 500.3875% when 32.000kHz crystal is used)
at 1Hz.
Level mode : Frequency in one second may change in the maximum range of
3.784ms
(
3.875ms when 32.000kHz crystal is used.)
Relation Between Mode Waveforms and CTFG Bit
Pulse mode
Approx. 92μs (32.768kHz crystal is used)
Approx. 94μs (32.000kHz crystal is used)
CTFG bit
(Counting up of seconds)
INTRA or INTRB pins
(INTR pin for the RS5C372B)
) Since counting up of seconds and the falling edge has a time lag of approx. 92s (at 32.768kHz) (approx.
94
s when 32.000kHz crystal is used), time with apparently approx. one second of delay from time of the
real-time clock may be read when time is read in synchronization with the falling edge of output.


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