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| 型号： | MCP79401T-I/MNY |
| 厂商： | Microchip Technology |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC CLK RTCC 64B EUI-48 8-TDFN |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，SRAM，唯一 ID |
| 存储容量： | 64B |
| 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： | 1.8 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 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-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN（2x3） |
| 包装： | 标准包装 |
| 其它名称： | MCP79401T-I/MNYDKR |
2011 Microchip Technology Inc.
DS25009C-page 9
MCP7940X
FIGURE 4-2:
ACKNOWLEDGE TIMING
4.1.2
DEVICE ADDRESSING AND OPERATION
A control byte is the first byte received following the
Start condition from the master device (Figure 4-2).
The control byte consists of a control code; for the
MCP7940X this is set as ‘1010111’ for read and write
operations for the Unique ID after the correct unlock
sequence.
The control byte for accessing the SRAM and RTCC
registers are set to ‘1101111’. The RTCC registers and
the SRAM share the same address space.
The last bit of the control byte defines the operation to
be performed. When set to a ‘1’ a read operation is
selected, and when set to a ‘0’ a write operation is
selected. The next byte received defines the address of
the data byte (Figure 4-3). The upper address bits are
transferred first, followed by the Least Significant bits
(LSb).
Following the Start condition, the MCP7940X monitors
the SDA bus, checking the device type identifier being
transmitted.
Upon
receiving
an
‘1010111’ or
‘1101111’ code, the slave device outputs an
Acknowledge signal on the SDA line. Depending on the
state of the R/W bit, the MCP7940X will select a read
or write operation.
FIGURE 4-3:
ADDRESS SEQUENCE BIT ASSIGNMENTS
SCL
9
8
7
6
5
4
3
2
11
2
3
Transmitter must release the SDA line at this point
allowing the Receiver to pull the SDA line low to
acknowledge the previous eight bits of data.
Receiver must release the SDA line at this point
so the Transmitter can continue sending data.
Data from transmitter
SDA
Acknowledge
Bit
1
010
R/W
1
A
0
11
1
0
A
Unique ID CONTROL BYTE
ADDRESS BYTE
CONTROL
CODE
111
X = Don’t Care
1
101
R/W
X
A
0
SRAM RTCC CONTROL BYTE
ADDRESS BYTE
CONTROL
CODE
111
X = Don’t Care
21
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| MCP79402T-I/MNY | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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