PT7C4300 Datasheet, PDF (5/17 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (I²c Bus)

Data Sheet
PT7C4300
Real-time Clock Module (I²C Bus)
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Registers
1. Allocation of registers
Addr.
(hex) ^*1
Function
Register definition
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2 Bit 1 Bit 0
00 Seconds (00-59)
ST^*2
S40
S20
S10
S8
S4
S2
S1
01 Minutes (00-59)
×
M40
M20
M10
M8
M4
M2
M1
02 Hours (00-23)
CEB^*3
CB^*3
H20
H10
H8
H4
H2
H1
03 Days of the week (01-07)
×
×
×
×
×
W4
W2
W1
04 Dates (01-31)
×
×
D20
D10
D8
D4
D2
D1
05 Months (01-12)
×
×
×^*8
MO10 MO8
MO4 MO2 MO1
06 Years (00-99)
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
07
Control^*3
OUT^*4
FT^*5
S^*6
Calibration^*7
Caution points:
*1. PT7C4300 uses 3 bits for address. That is if write data to 08H, the data will be written to 00H address register.
*2. Stop bit. When this bit is set to 1, oscillator and time count chain are both stopped.
*3. CEB: Century Enable Bit. CB: Century Bit.
*4. Control FT/OUT pin output DC level when 512Hz square wave is disabled.
*5. Frequency Test. 512Hz square wave output is enabled at FT/OUT pin, which is using for frequency test.
*6. Sign Bit. “1” indicates positive calibration; “0”indicates negative calibration.
*7. Using for modifying count frequency. If 20ppm is wanted to slow down the count frequency, 10 (01010) should be loaded.
Calibration will not affect FT/OUT output frequency.
*8. Don’t care.
PT0222(02/06)
5
Ver: 0