mc33702 Freescale Semiconductor, Inc, mc33702 Datasheet - Page 19

• Manufacturer Part Number: mc33702
• Description: 3.0 A Switch-mode Power Supply With Linear Regulator
• Manufacturer: Freescale Semiconductor, Inc

Introduction
standard. SDA and SCL pins are the Serial Data and Serial
Clock pins of the I
I
Communication Start
the slave device unique address.
transfer beginning an I
address.
Slave Address Definition
the CLKSEL pin and the ADDR pin.
configuration of the oscillator synchronization CLKSYN pin.
the same I
address bits. A different combination of bits A1 and A0 is
assigned to each individual part to assure its unique address.
Figure 14
address.
portion of the device address.
2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
C Command and Data Formats
The 33702 device is compatible with the I
Communication starts with a START condition, followed by
33702 has the two LSB’s address bits defined by the state of
Note The state of the CLKSEL pin also defines the
This feature allows up to four 33702 ICs to communicate in
Figure 14. Address Bit Definition for 7-Bit Address
Figure 13. Communication Using 7-Bit Address
Table 3
illustrates the flexible addressing feature for a 7-bit
2
S
C bus, all of them sharing the same high-order
Bits
provides the definition of the selectable
2
C bus.
1 1 1 0 1 A1 A0
7-Bit Address
6
2
C communication for a 7-bit slave
Fixed Address Selectable
5
4
3
Figure 13
2
Freescale Semiconductor, Inc.
For More Information On This Product,
1 0
Address
R/W
illustrates the data
2
C interface
Go to: www.freescale.com
Ack
I
2
C BUS OPERATION
Table 3. Definition of Selectable Portion of Device Address
Writing Data Into the Slave Device
be written into the slave registers. The R/W bit must be set to 0
so DATA will be read.
sequence. Actions performed by the slave device are grayed.
Data Definition
writes a Command Byte and writes one Data Byte. The
Command Byte identifies the kind of operation required by the
master and has two fields, as illustrated in
The address field is selected from the list in
definitions for the entire set of operation options.
CLKSEL Pin
1. Address field
2. Value field
After the address acknowledgment by the slave, DATA can
For the sake of 33702 acting as a slave device, the master
Refer to
S
Open
Open
Low
Low
Figure 15. Data Transfer for Write Operations
Code
001
010
011
7-Bit Address
Table
Bits
Table 4. Address Field Definitions
Address Field
5, page 20, which summarizes the value field
Figure 16. Command Byte
D7
ADDR Pin
7
Open
Open
Low
Low
Voltage Margining
Figure 15
D6 D5 D4 D3
6
Operation
Watchdog
Not Used
5
0
4
shows the data write
Ack
Value Field
3
A1
D2
0
0
1
1
2
D1 D0
Figure
1
DATA
Table
0
Write
16:
4.
W
W
–
A0
0
1
0
1
Ack
33702
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