DS1374C-18- MAXIM [Maxim Integrated Products], DS1374C-18- Datasheet - Page 14

• 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]

The DS1374 supports the I
that sends data onto the bus is defined as a transmitter
and a device receiving data is a receiver. The device
that controls the message is called a master. The
devices that are controlled by the master are slaves. A
master device that generates the serial clock (SCL),
controls the bus access, and generates the START and
STOP conditions must control the bus. The DS1374
operates as a slave on the I
bus are made through the open-drain I/O lines SDA
I
Tickle Charger and Reset Input/Output
Figure 7. Programmable Trickle Charger
Figure 8. I
14
2
C, 32-Bit Binary Counter Watchdog RTC with
____________________________________________________________________
SDA
SCL
CONDITION
2
C Data Transfer Overview
START
V
TCS3
BIT 7
CC
MSB
1
ENABLES CHARGER
NOTE: ONLY 1010b
TCS2
BIT 6
1 OF 16 SELECT
I 2 C Serial Data Bus
2
2
2
SLAVE ADDRESS
TCS1
BIT 5
C bus protocol. A device
C bus. Connections to the
TCS0
BIT 4
6
BIT 3
DS1
SELECT
1 OF 2
7
BIT 2
DS0
DIRECTION
R/W
BIT
ROUT1
BIT 1
8
SIGNAL FROM RECEIVER
SELECT
1 OF 3
ACKNOWLEDGEMENT
ROUT0
BIT 0
ACK
9
and SCL. A standard mode (100kHz max clock rate)
and a fast mode (400kHz max clock rate) are defined
within the bus specifications. The DS1374 works in both
modes.
The following bus protocol has been defined (Figure 8):
• Data transfer can be initiated only when the bus is
• During data transfer, the data line must remain sta-
not busy.
ble whenever the clock line is high. Changes in the
data line while the clock line is high can be interpret-
ed as control signals.
TCS
DS
TOUT
0-1
0-3
1
0-1
= DIODE SELECT
= TRICKLE CHARGER SELECT
= RESISTOR SELECT
2
REPEATED IF MORE BYTES
ARE TRANSFERED
250Ω
2kΩ
4kΩ
R1
R2
R3
3–7
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
8
V
BACKUP
ACK
9
OR REPEATED
CONDITION
CONDITION
START
STOP