参数资料
| 型号： | PT7C43390WEX |
| 厂商： | Pericom |
| 文件页数： | 20/23页 |
| 文件大小： | 0K |
| 描述： | IC REAL TIME CLOCK 8SOIC |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.3 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.1 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： | PT7C43390WEXDKR |
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PT0280(08/09)
Ver: 3
6
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
2.
Status register_1
Status register_1 is an 8-bit register that is used to display and set various modes. The bit configuration is shown below.
R: Read-enabled
W: Write-enabled
R/W: Read/Write-enabled
B7: POC
This flag is set to “1” at power-on. Once this flag is set to “1”, it is not set to “0” even when the power supply voltage
reaches or exceeds the detection voltage (VDET). This flag is read-only and can be read by the status register_1 access
command. Once it is read, it is automatically set to “0”. When the flag is “1”, it must be initialized. For the method of
initialization, refer to “Initialization at Power-on and Power-on Detector”.
B6: BLD
If the power supply voltage detector detects a voltage of detection voltage (VDET) or less this flag is set to “1”, which
enables the detection of a power supply voltage drop. Once this flag is set to “1”, it is not set to “0” even when the
power supply voltage reaches or exceeds the detection voltage (VDET). This flag is read-only and can be read by the
status register_1 access command. Once it is read, it is automatically set to “0”. When the flag is “1”, it must be
initialized. For the method of initialization, refer to “Initialization at Power-on and Power-on Detector”. and for the
operation of the power supply voltage detector, refer to “Power Supply Voltage Detector”.
B5, B4: INT2, INT1
When the interrupt signal is output from the INT1 or INT2 pin using the alarm interrupt function, for an interrupt signal
output from the INT1 pin, the INT1 flag is set to “1”, and for an interrupt signal output from the INT2 pin, the INT2 flag
is set to “1”.
B3, B2: SC1, SC0
These flags configure a 2-bit SRAM type register that can be freely set by users. They are read and written within the
operating voltage range (1.3 to 5.5 V).
B1: 12/24
This flag is used to set 12-hour or 24-hour expression.
0: 12-hour expression
1: 24-hour expression
B0: RESET
By setting this bit to “1”, the internal IC is initialized. This is a write-only bit and is always “0” when it is read. Be sure
to write “1” to the reset flag when applying the power supply voltage to the IC.
3.
Status register_2
Status register_2 is an 8-bit register that is used to display and set various modes. The bit configuration is shown below.
R/W: Read/Write-enabled
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