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参数资料
| 型号： | DS1682 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 0 TIMER(S), TIME RECORDER, PDSO8 |
| 封装： | MICRO, SOP-8 |
| 文件页数： | 13/13页 |
| 文件大小： | 77K |
| 代理商： | DS1682 |
DS1682
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Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after the
reception of each byte. The master device must generate an extra clock pulse which is associated with
this acknowledge bit.
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of
course, setup and hold times must be taken into account. A master must signal an end of data to the slave
by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case,
the slave must leave the data line HIGH to enable the master to generate the STOP condition.
Depending upon the state of the R/W* bit, two types of data transfer are possible:
1. Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is
the slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after
each received byte.
2. Data transfer from a slave transmitter to a master receiver. The first byte (the slave address) is
transmitted by the master. The slave then returns an acknowledge bit. Next follows a number of data
bytes transmitted by the slave to the master. The master returns an acknowledge bit after all received
bytes other than the last byte. At the end of the last received byte, a ‘not acknowledge’ is returned.
The master device generates all of the serial clock pulses and the START and STOP conditions. A
transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START
condition is also the beginning of the next serial transfer, the bus will not be released.
The DS1682 may operate in the following two modes:
1. Slave receiver mode: Serial data and clock are received through SDA and SCL. After each byte is
received, an acknowledge bit is transmitted. START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address recognition is performed by hardware after reception
of the slave address and direction bit.
2. Slave transmitter mode:
The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit will indicate that the transfer direction is reversed. Serial
data is transmitted on SDA by the DS1682 while the serial clock is input on SCL. START and STOP
conditions are recognized as the beginning and end of a serial transfer.
SLAVE ADDRESS
A control byte is the first byte received following the START condition from the master device. The
control byte consists of a four bit control code; for the DS1682, this is set as 1101 binary for read and
write operations. The next three bits of the control byte are the device select bits (A2, A1, A0). These
bits are set to 011 (A2=0, A1=1, A0=1) for the DS1682. They are used by the master device to select
which of eight devices are to be accessed. The set bits are in effect the three least significant bits of the
slave address. The last bit of the control byte (R/W*) defines the operation to be performed. When set to
a one a read operation is selected, and when set to a zero a write operation is selected. Following the
START condition, the DS1682 monitors the SDA bus checking the device type identifier being
transmitted. Upon receiving the 1101 code and appropriate device select bits of 011, the DS1682 outputs
an acknowledge signal on the SDA line.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1685-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1687-5 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1685Q-3 | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS1685S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685E-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1682_13 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Total-Elapsed-Time Recorder with Alarm |
| DS1682S | 功能描述:实时时钟 Total-Elapsed-Time Recorder w/Alarm 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 |
| DS1682S/GG8 | 制造商:Maxim Integrated Products 功能描述: |
| DS1682S/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10BYTE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC TIMEKEEPER ALARM ELAPSE 8SOIC |
| DS1682S/T&R | 功能描述:实时时钟 Total-Elapsed-Time Recorder w/Alarm 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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