參數(shù)資料
型號(hào): SMP9410F
廠商: Electronic Theatre Controls, Inc.
英文描述: Quad 10-Bit Nonvolatile DACPOT
中文描述: 四路10位非易失DACPOT
文件頁(yè)數(shù): 9/13頁(yè)
文件大小: 422K
代理商: SMP9410F
9
SMP9410
SUMMIT MICROELECTRONICS, Inc.
Preliminary nformation
2056 2.0 10/04/02
C
2
C
4
A
C
K
A
C
K
2056 Fig05
S
T
O
P
Master
SDA
Slave
1 0 0 1
R/
W
A
2
A
1
A
0
Optional
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
2056 Fig03
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
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 =
1001
BIN
; 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 1001
BIN
as the device type address, conse-
quently the DAC address should never be set to 1001
BIN
.
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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