PT7C4372A Datasheet, PDF (12/30 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4372A/4372C
Real-time Clock Module (I²C Bus)
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Calendar Counter
The data format is BCD format.
 Day digits: Range from 1 to 31 (for January, March, May, July, August, October and December).
Range from 1 to 30 (for April, June, September and November).
Range from 1 to 29 (for February in leap years).
Range from 1 to 28 (for February in ordinary years).
Carried to month digits when cycled to 1.
 Month digits: Range from 1 to 12 and carried to year digits when cycled to 1.
 Year digits: Range from 00 to 99 and 00, 04, 08, … , 92 and 96 are counted as leap years.
Addr. Description
D7
D6
D5
D4
D3
D2
D1
D0
4
Days
-
-
D20
D10
D8
D4
D2
D1
(default)
0
0
Undefined Undefined Undefined Undefined Undefined Undefined
5
Months
-
-
-
M10
M8
M4
M2
M1
(default)
0
0
0
Undefined Undefined Undefined Undefined Undefined
6
Years
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
Note: Any registered imaginary time should be replaced with correct time; otherwise it will cause the clock counter malfunction.
Time Trimming Register
Addr. Description
D7
D6
D5
D4
D3
D2
D1
D0
7 ^{Time trimming /XSL}
F6
F5
F4
F3
F2
F1
F0
(default)
0
0
0
0
0
0
0
0
Note: Time trimming function only adjusts clock timing. Oscillation frequency and 32-kHz clock output is not adjusted.
 /XSL bit
The /XSL bit is used to select frequency of the crystal.
/XSL
0
1
Frequency of the crystal (kHz)
32.768
32.000
 F6 to F0
Implement a higher-precision clock function. See section “Clock Precision Adjustment Function”.
12-07-0001
PT0150-8 07/04/12
12