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X9470
X9470 BUS INTERFACE INFORMATION
Figure 7. Slave Address, Word Address, and Data Bytes - Write Mode
Device Identifier
Slave Address
0
1
0
1
S2
S1
S0
R/W=0
Slave Address Byte
Byte 0
A7
A6
A5
A4
A3
A2
A1
A0
Byte Address
Byte 1
0Fh : SR
00h : V BIAS
01h : V REF
D7
D6
D5
D4
D3
D2
D1
D0
Data Byte
Byte 2
Figure 8. Slave Address, Word Address, and Data Bytes - Read Mode
Device Identifier
Slave Address
0
D7
D7
1
D6
D6
0
D5
D5
1
D4
D4
S2
D3
D3
S1
D2
D2
S0
D1
D1
R/W
D0
D0
Slave Address Byte
Byte 0
Data Byte
Byte 1
Data Byte
Byte 2
Slave Address, Byte Address, and Data Byte
The byte communication format for the serial bus is
shown in Figures 7 and 8 above. The first byte, BYTE
0, defines the device indentifier, 0101 in the upper
half; and the device slave address in the low half of the
byte. The slave address is determined by the logic val-
ues of the A0, A1, and A2 pins of the X9470. This
allows for up to 8 unique addresses for the X9470. The
next byte, BYTE 1, is the Byte Address. The Byte
Address identifies a unique address for the Status or
Control Registers as shown in Table 3. The following
byte, Byte 2, is the data byte that is used for READ
and WRITE operations.
19
Start Condition
All commands are preceded by the start condition,
which is a HIGH to LOW transition of SDA when SCL
is HIGH. The device continuously monitors the SDA
and SCL lines for the start condition and will not
respond to any command until this condition has been
met. See Figure 9.
FN8204.0
March 8, 2005
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