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SMP9410F データシート(PDF) 9 Page - List of Unclassifed Manufacturers

部品番号 SMP9410F
部品情報  Quad 10-Bit Nonvolatile DACPOT
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SMP9410F データシート(HTML) 9 Page - List of Unclassifed Manufacturers

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SMP9410
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
2056 2.0 10/04/02
C
2
C
4
A
C
K
A
C
K
S
T
O
P
Master
SDA
Slave
1 0 0 1
R/
W
A
2
A
1
A
0
Optional
2056 Fig05
1
C
7
C
6
C
5
C
3
C
1
C
0
Configuration Data Byte
A
C
K
Master
SDA
Slave
0 1 0 1
R/
W
1
A
2
A
1
A
0
2056 Fig04
DAC
S
T
O
P
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
C
K
x x x x
1 0 0 1
Data from Master
Data to Master
N
A
C
K
D
9
D
8
A
C
K
x x x x x x
A
C
K
D
9
D
8
A
C
K
A
C
K
S
T
O
P
Master
SDA
Slave
0 1 0 1
R/
W
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
x
A
2
A
1
A
0
1 0 0 1
Nonvolatile Write Only
x
2056 Fig03
Command Data Byte
ACK and NACK
A device that is receiving data will respond with an Acknowl-
edge by pulling the SDA line low (ACK) after each byte is
transmitted. The transmitting device will recognize this and
continue to transmit. When the Master has received the
data it expects it will hold the SDA line high (NACK) and the
transmitting device will end transmission.
Sequence
The sequence is to issue a Start, followed by the device
type and bus address with the Read/Write bit set to zero.
The device will respond with an Acknowledge and the
Master will then issue the command and follow-on data. In
Figure 5 the Write is to DAC1 where the command =
1001BIN; D9 and D8 are the MSBs of the DAC value being
written. The device will then respond with an Acknowledge
followed by the Master writing the last eight bits. If no Stop
is generated after the device Acknowledge the Write is only
to the register. If the device Acknowledge is followed by a
Stop the data is written to both the DAC register and to the
nonvolatile register.
Reading the Device
Reading the DACs requires setting the R/W bit to one. Then
the host supplies clocks and the device will output data as
shown in Figure 6.
Configuration Register
The SMP9410 can be configured by the end user or by
Summit prior to shipment (see Programming Information).
Reading the configuration register can also be performed if
it has not already been locked. See Figure 7. There is one
configuration register and it is accessed through the serial
interface using 1001BIN as the device type address, conse-
quently the DAC address should never be set to 1001BIN.
The register is shown in Table 3.
Figure 5. DAC1 Write Operation (see Table 2)
Figure 6. Read DACs
APPLICATIONS INFORMATION (CONTINUED)
Figure 7. Configuration Register (see Table 3)


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