参数资料
| 型号： | PT7C4311WEX |
| 厂商： | Pericom |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC RTC LEAP YEAR Y2K 8SOIC |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，方波输出，Y2K |
| 存储容量： | 56B |
| 时间格式： | HH:MM:SS（24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.2 V ~ 5.5 V |
| 电压 - 电源，电池： | 2 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 其它名称： | PT7C4311WEXDKR |
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PT0322(08/09)
Ver: 2
6
Data Sheet
PT7C4311
Real-time Clock Module (I
2C Bus)
2.
Control and status register
Addr.
(hex)
Description
D7
D6
D5
D4
D3
D2
D1
D0
Control
OUT
FT
S
Calibration
07
(default)
0
1
a)
OUT
OUT: Set pin 7 output DC level..
OUT
Data
Description
1
Set high level at pin 7.
Default
Read / Write
0
Set low level at pin 7.
b)
512Hz output
FT: 512Hz square wave output Enable bit, using for Frequency Test.
FT
Data
Description
0
Disable 512Hz output at pin 7.
Default
Read / Write
1
Enable 512Hz output at pin 7.
c)
Calibration bits
S: Sign bit.
S
Data
Description
1
Indicate positive calibration.
Default
Read / Write
0
Indicate negative calibration.
Calibration:
Calibration occurs within a 64minute cycle. The first 62 minutes in the cycle may, once per minute, have one second either
shortened by 128 or lengthened by 256 oscillator cycles. If a binary '1' is loaded into the register, only the first 2
minutes in the 64 minute cycle will be modified; if a binary 6 is loaded, the first 12 will be affected, and so on. Therefore, each
calibration step has the effect of adding 512 or subtracting 256 oscillator cycles for every 125,829,120 actual oscillator cycles, that
is +4.068 or –2.034 ppm of adjustment per calibration step in the calibration register. Assuming that the oscillator is in fact
running at exactly 32,768Hz, each of the 31 increments in the Calibration byte would represent +10.7 or –5.35 seconds per month
which corresponds to a total range of +5.5 or –2.75 minutes per month.
For example, a reading of 512.01024Hz would indicate a +20 ppm oscillator frequency error, requiring a –10 (XX001010) to be
loaded into the Calibration Byte for correction. Note that setting or changing the Calibration Byte does not affect the Frequency
test output frequency.
Clock calibration
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