MAX6900 Maxim, MAX6900 Datasheet - Page 6

• Manufacturer Part Number: MAX6900
• Description: I2C-Compatible RTC in a TDFN
• Manufacturer: Maxim

I
Figure 3. I
Figure 4. I
Figure 5. I
After the Start condition occurs, 1 bit of data is trans-
ferred for each clock pulse. The data on SDA must
remain stable during the high portion of the clock pulse
as changes in data during this time are interpreted as a
control signal (Figure 5). Any time a start condition
occurs, the Slave ID must follow immediately, regard-
less of completion of the previous data transfer.
Before any data is transmitted on the I
ble serial interface, the device that is expected to
respond is addressed first. The first byte sent after the
start (S) procedure is the Address byte or 7-bit Slave
6
2
_______________________________________________________________________________________
C-Compatible RTC in a TDFN
SDA
SCL
2
2
2
C Bus System Configuration
C Bus Start and Stop Conditions
C Bus Bit Transfer
START CONDITION
SDA
SCL
S
SDA
SCL
TRANSMITTER/
RECEIVER
MASTER
2
C-bus-compati-
DATA VALID
DATA LINE
STABLE;
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
SLAVE
ALLOWED
CHANGE
OF DATA
ID. The MAX6900 acts as a slave transmitter/receiver.
Therefore, SCL is only an input clock signal and SDA is
a bidirectional data line. The Slave Address for the
MAX6900 is shown in Figure 6.
Figure 6. I
TRANSMITTER
BIT 7
1
MASTER
2
C Bus Slave Address or 7-Bit Slave ID
0
TRANSMITTER/
1
RECEIVER
MASTER
0
STOP CONDITION
0
P
0
0
SDA
SCL
RD/W
BIT 0