DS1374C-18- MAXIM [Maxim Integrated Products], DS1374C-18- Datasheet - Page 16

• Manufacturer Part Number: DS1374C-18-
• Description: I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
• Manufacturer: MAXIM [Maxim Integrated Products]

I
Tickle Charger and Reset Input/Output
16
2
After the DS1374 acknowledges the slave address
+ write bit, the master transmits a register address
to the DS1374. This sets the register pointer on the
DS1374, with the DS1374 acknowledging the trans-
fer. The master can then transmit zero or more
bytes of data, with the DS1374 acknowledging
each byte received. The register pointer increments
after each data byte is transferred. The master gen-
erates a STOP condition to terminate the data write.
Slave Transmitter Mode (Read Mode): The first
byte is received and handled as in the slave receiv-
er mode. However, in this mode, the direction bit
indicates that the transfer direction is reversed.
Serial data is transmitted on SDA by the DS1374,
while the serial clock is input on SCL. 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. 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 DS1374 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 DS1374 outputs an
acknowledge on SDA. The DS1374 then begins to
transmit data starting with the register address
pointed to by the register pointer. If the register
C, 32-Bit Binary Counter Watchdog RTC with
____________________________________________________________________
TOP VIEW
V
BACKUP
GND
RST
X1
X2
1
2
3
4
5
DS1374
µSOP
10
9
8
7
6
V
SQW
INT
SCL
SDA
CC
The DS1374C package contains a quartz tuning-fork
crystal. Pick-and-place equipment can be used, but
precautions should be taken to ensure that excessive
shocks are avoided. Ultrasonic cleaning should be
avoided to prevent damage to the crystal.
Avoid running signal traces under the package, unless
a ground plane is placed between the package and the
signal line. All no connect (N.C.) pins must be connect-
ed to ground.
The SO package can be reflowed as long as the peak
temperature does not exceed 240°C. Peak reflow tem-
perature (≥ 230°C) duration should not exceed 10 sec-
onds, and the total time above 200°C should not
exceed 40 seconds (30 seconds nominal). Exposure to
reflow is limited to 2 times maximum.
Moisture-sensitive packages are shipped from the facto-
ry dry-packed. Handling instructions listed on the pack-
age label must be followed to prevent damage during
reflow. Refer to the IPC/JEDEC J-STD-020B standard for
moisture-sensitive device (MSD) classifications.
pointer is not written to before the initiation of a
read mode, the first address that is read is the last
one stored in the register pointer. The DS1374 must
receive a not acknowledge to end a read.
SQW
Handling, PC Board Layout, and
SCL
N.C.
N.C.
N.C.
N.C.
V
INT
CC
1
2
3
4
5
6
7
8
SO (0.300")
DS1374C
16
15
14
13
11
10
12
9
Pin Configurations
SDA
GND
RST
V
N.C.
N.C.
N.C.
N.C.
BACKUP
Assembly