参数资料
| 型号： | PT7C4311WEX |
| 厂商： | Pericom |
| 文件页数： | 2/17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
10
Data Sheet
PT7C4311
Real-time Clock Module (I
2C Bus)
Data acknowledge response (ACK signal)
When transferring data, the receiver generates a confirmation response (ACK signal, low active) each time an 8-bit data segment
is received. If there is no ACK signal from the receiver, it indicates that normal communication has not been established. (This
does not include instances where the master device intentionally does not generate an ACK signal.)
Immediately after the falling edge of the clock pulse corresponding to the 8th bit of data on the SCL line, the transmitter releases
the SDA line and the receiver sets the SDA line to low (= acknowledge) level.
After transmitting the ACK signal, if the Master remains the receiver for transfer of the next byte, the SDA is released at the
falling edge of the clock corresponding to the 9th bit of data on the SCL line. Data transfer resumes when the Master becomes the
transmitter.
When the Master is the receiver, if the Master does not send an ACK signal in response to the last byte sent from the slave, that
indicates to the transmitter that data transfer has ended. At that point, the transmitter continues to release the SDA and awaits a
STOP condition from the Master.
e)
Slave Address
The I2C bus device does not include a chip select pin such as is found in ordinary logic devices. Instead of using a chip select pin,
slave addresses are allocated to each device.
All communications begin with transmitting the [START condition] + [slave address (+ R/W specification)]. The receiving device
responds to this communication only when the specified slave address it has received matches its own slave address.
Slave addresses have a fixed length of 7 bits. See table for the details.
An R/W bit is added to each 7-bit slave address during 8-bit transfers.
Slave address
R / W bit
Operation
Transfer data
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Read
D1 h
1 (= Read)
Write
D0 h
1
0
1
0
0 (= Write)
2.
I
2C Bus’s Basic Transfer Format
SCL from Master
1
2
89
SDA from transmitter
(sending side)
SDA from receiver
(receiving side)
Release SDA
Low active
ACK signal
S
Start indication
P
Stop indication
Sr
Restart indication
A
RTC Acknowledge
A
Master Acknowledge
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| PT7C4337WEX | 功能描述:IC RTC ALARM 8SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 标准包装:2,500 系列:- 类型:时钟/日历 特点:警报器，闰年，监控器，监视计时器 存储容量:- 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:2.7 V ~ 5.5 V 电压 - 电源，电池:1.8 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) |
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