1337GDCGI IDT, 1337GDCGI Datasheet - Page 11
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1337GDCGI
Manufacturer Part Number
1337GDCGI
Description
Real Time Clock Real Time Clock
Manufacturer
IDT
Datasheet
1.1337GDCGI.pdf
(27 pages)
Specifications of 1337GDCGI
Rohs
yes
Function
Clock, Calendar, Alarm
Rtc Bus Interface
I2C
Date Format
YY-MM-DD-dd
Time Format
HH
Supply Voltage - Max
5.5 V
Supply Voltage - Min
1.8 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
SOIC-8
Battery Backup Switching
No
Part # Aliases
IDT1337GDCGI
Data Transfer on I
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.
Data is transferred with the most significant bit (MSB) first.
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,
followed by the slave transmitting a number of data bytes.
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 is not released. Data is transferred with the
most significant bit (MSB) first.
The IDT1337G can operate in the following two modes:
1) Slave Receiver Mode (Write 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
IDT® REAL-TIME CLOCK WITH I
IDT1337G
REA LTIME CLOCK WITH SERIAL INTERFACE
2
C Serial Bus
2
C SERIAL INTERFACE
11
bit (see the “Data Write–Slave Receiver Mode” figure). The
slave address byte is the first byte received after the START
condition is generated by the master. The slave address
byte contains the 7-bit IDT1337G address, which is
1101000, followed by the direction bit (R/W), which is 0 for a
write. After receiving and decoding the slave address byte
the device outputs an acknowledge on the SDA line. After
the IDT1337G acknowledges the slave address + write bit,
the master transmits a register address to the IDT1337G.
This sets the register pointer on the IDT1337G. The master
may then transmit zero or more bytes of data, with the
IDT1337G acknowledging each byte received. The address
pointer increments after each data byte is transferred. The
master generates a STOP condition to terminate the data
write.
2) Slave Transmitter Mode (Read Mode): The first byte is
received and handled as in the slave receiver mode.
However, in this mode, the direction bit indicates that the
transfer direction is reversed. Serial data is transmitted on
SDA by the IDT1337G while the serial clock is input on SCL.
START and STOP conditions are recognized as the
beginning and end of a serial transfer (see the “Data
Read–Slave Transmitter Mode” figure). The slave address
byte is the first byte received after the START condition is
generated by the master. The slave address byte contains
the 7-bit IDT1337G address, which is 1101000, followed by
the direction bit (R/W), which is 1 for a read. After receiving
and decoding the slave address byte the slave outputs an
acknowledge on the SDA line. The IDT1337G then begins
to transmit data starting with the register address pointed to
IDT1337G
REV L 102412
RTC