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參數(shù)資料
| 型號(hào)： | PT7C43390WEX |
| 廠商： | Pericom |
| 文件頁數(shù)： | 7/23頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC REAL TIME CLOCK 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，閏年，方波輸出 |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 1.3 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.1 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | PT7C43390WEXDKR |
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PT0280(08/09)
Ver: 3
15
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
B7 =0
B7 =1
Slow/fast adjustment
Every 20 seconds
Every 60 seconds
Minimum resolution
3.052 ppm
1.017 ppm
Correction range
195.3 ppm to +192.2 ppm
65.1 ppm to +64.1 ppm
2.
If current oscillation frequency < target frequency (in case the clock is slow)
Caution The figure range which can be corrected is that the calculated value is from 0 to 62.
I2C Bus’s Basic Transfer Format
The master device on the system generates a start condition to the slave device to communicate. Then it transmits a 4-bit device
address, 3-bit command, and 1-bit read/write command on the SDA bus. The higher 4 bits that indicate the device address are
called the device code and are fixed to “0110”.
1.
Data reading
After detecting the start condition from outside, a device code and command are received. If the read/write bit is “1” at this point,
the data read mode is entered. The data output sequence is output from the LSB.
2.
Data writing
After detecting the start condition from outside, a device code and command are received. If the read/write bit is “0” at this point,
the real-time data write mode or another register write mode is entered. Input the data input sequence for both the real-time data
write mode and status register write mode from the LSB.
In real-time data writing, the calendar and time counter is reset by the rising of the ACK signal after the real-time write command
and update operations are then prohibited. Subsequently, when minute data reception is completed, an end-of-month correction is
performed while the second data is loaded.
Counting up is started from the rising of the ACK signal after the second data reception.
3.
Basic Transfer Format
1)
Real-time data access 1
*1. During reading, set NO_ACK to 1.
*2. During reading, transmit ACK = 0 to PT7C43390 from the master device.
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