DS1372 Maxim, DS1372 Datasheet - Page 9

• Manufacturer Part Number: DS1372
• Description: The DS1372 is a 32-bit binary up counter and 24-bit down counter with a unique 64-bit ID
• Manufacturer: Maxim

Figure 4. Data Transfer on I
Figure 5. I
conditions. The DS1372 operates as a slave on the I
bus. Connections to the bus are made through the SCL
input and open-drain SDA I/O lines. Within the bus
specifications, a standard mode (100kHz maximum
clock rate) and a fast mode (400kHz maximum clock
rate) are defined. The DS1372 works in both modes.
I
SDA
SCL
SDA
SCL
2
CONDITION
START
C, 32-Bit, Binary Counter Clock with 64-Bit ID
STOP
2
C Data Transfer Overview
t
BUF
START
MSB
_______________________________________________________________________________________
1
2
C Serial Bus
t
HD:STA
2
t
LOW
SLAVE ADDRESS
t
R
6
t
HD:DAT
7
t
F
DIRECTION
t
HIGH
R/W
BIT
8
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
2
C
t
SU:DAT
ACK
9
The following bus protocol has been defined (Figure 5):
• Data transfer can be initiated only when the bus is
• During data transfer, the data line must remain stable
not busy.
whenever the clock line is high. Changes in the data
line while the clock line is high are interpreted as
control signals.
REPEATED
START
1
t
SU:STA
t
HD:STA
2
REPEATED IF MORE BYTES
ARE TRANSFERED
3–7
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
8
ACK
9
t
SP
t
SU:STO
OR REPEATED
CONDITION
CONDITION
START
STOP
9