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DS1307N Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # DS1307N
Description  64 x 8, Serial, I2C Real-Time Clock
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1307N Datasheet(HTML) 10 Page - Maxim Integrated Products

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DS1307 64 x 8, Serial, I
2C Real-Time Clock
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I2C DATA BUS
The DS1307 supports the I2C protocol. A device that sends data onto the bus is defined as a transmitter
and a device receiving data as a receiver. The device that controls the message is called a master. The
devices that are controlled by the master are referred to as slaves. The bus must be controlled by a master
device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP
conditions. The DS1307 operates as a slave on the I2C bus.
Figures 3, 4, and 5 detail how data is transferred on the I2C bus.
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in
the data line while the clock line is high will be interpreted as control signals.
Accordingly, the following bus conditions have been defined:
Bus not busy: Both data and clock lines remain HIGH.
Start data transfer: A change in the state of the data line, from HIGH to LOW, while the clock is
HIGH, defines a START condition.
Stop data transfer: A change in the state of the data line, from LOW to HIGH, while the clock line
is HIGH, defines the STOP condition.
Data valid: The state of the data line represents valid data when, after a START condition, the data
line is stable for the duration of the HIGH period of the clock signal. The data on the line must be
changed during the LOW period of the clock signal. There is one clock pulse per bit of data.
Each data transfer is initiated with a START condition and terminated with a STOP condition. The
number of data bytes transferred between START and STOP conditions is not limited, and is
determined by the master device. The information is transferred byte-wise and each receiver
acknowledges with a ninth bit. Within the I2C bus specifications a standard mode (100kHz clock
rate) and a fast mode (400kHz clock rate) are defined. The DS1307 operates in the standard mode
(100kHz) only.
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.


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