參數(shù)資料
型號(hào)： PT7C43390WEX
廠商： Pericom
文件頁(yè)數(shù)： 23/23頁(yè)
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
9
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
5.
Clock adjustment register
The clock adjustment register is a 1-byte register that is used to logically correct real-time data. When not using the clock
adjustment register, set this register to 00h using the clock adjustment register write command.
For the “register value”, refer to “Clock Adjustment Function”.
R/W: Read/Write-enabled
6.
Free register
The free register is a 1-byte SRAM type register that can be set freely by users. It can be read and written within the operating
voltage range (1.3 to 5.5 V).
R/W: Read/Write-enabled
Initialization at Power-on and Power-on Detector
When power is applied to this IC, status register_1 is set to “80h” (bit 7 (POC flag) of status register_1 is set to “1”) by the power-
on detector and a 1 Hz clock is output from the INT pin. This function is provided to adjust the oscillation frequency. In normal
use, the IC must be initialized at power-on. Initialization is performed by writing “1” to bit 0 (RESET flag) of status register_1.
Also, the IC must be initialized when the POC flag is set to “1”. After initialization, the POC flag is set to “0”. For normal
operation of the power-on detector, first hold the IC power supply voltage at 0 V and then increase it.
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