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RV5C338A-E2 Datasheet

  • RV5C338A-E2

  • 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MON...

  • 52頁

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R
脳
5C338A
An increase of two clock pulses once per 20 seconds causes a time count loss of approximately 3ppm (2 / (32768
脳
20=3.051ppm). Conversely, a decrease of two clock pulses once per 20 seconds causes a time count gain of 3ppm.
Consequently, deviations in time counts can be corrected with a precision of 鹵1.5ppm. Note that the oscillation
adjustment circuit is configured to correct deviations in time counts and not the oscillation frequency of the 32.768-
kHz clock pulses. For further details, see 鈥淯SAGE, 2.4 Oscillation Adjustment Circuit鈥?
2.7 Alarm_W Register (at Address 8h to Ah)
2.7-1 Alarm_W Minute Register (at Address 8h)
D7
鈥?/div>
0
0
D6
WM
40
WM
40
D5
WM
20
WM
20
D4
WM
10
WM
10
D3
WM
8
WM
8
D2
WM
4
WM
4
D1
WM
2
WM
2
D0
WM
1
WM
1
(For writing)
(For reading)
Default settings*
Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite
2.7-2 Alarm_W Hour Register (at Address 9h)
D7
鈥?/div>
0
0
D6
鈥?/div>
0
0
D5
WH
20
,WP/A
WH
20
,WP/A
D4
WH
10
WH
10
D3
WH
8
WH
8
D2
WH
4
WH
4
D1
WH
2
WH
2
D0
WH
1
WH
1
(For writing)
(For reading)
Default settings*
Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite
2.7-3 Alarm_W Day-of-week Register (at Address Ah)
D7
鈥?/div>
0
0
D6
WW
6
WW
6
D5
WW
5
WW
5
D4
WW
4
WW
4
D3
WW
3
WW
3
D2
WW
2
WW
2
D1
WW
1
WW
1
D0
WW
0
WW
0
(For writing)
(For reading)
Default settings*
Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite
*
)
Default settings: Default value means read/written values when the XSTP bit is set to 鈥?鈥?due to power-on from 0 volts or supply voltage drop.
路 The D5 bit of the Alarm_W hour register represents WP/A when the 12-hour mode is selected (0 for a.m. and 1
for p.m.). and WH
20
when the 24-hour mode is selected (tens in the hour digits).
路 The Alarm _W registers should not have any non-existent alarm time settings. (Note that any mismatch between
current time and preset alarm time specified by the Alarm_W registers may disable the alarm circuit.)
路 When the 12-hour mode is selected, the hour digits read 12 and 32 for 0 a.m. and 0 p.m., respectively (see 鈥?.1-2
12/24: 12-/24-hour Mode Selection Bit鈥?.
路 WW
0
to WW
6
correspond to W
4
, W
2
, and W
1
of the day-of-week counter with settings ranging from (0, 0, 0) to (1,
1, 0).
路 WW
0
to WW
6
with respective settings of 0 disable the outputs of the Alarm_W registers.
19

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