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參數(shù)資料
| 型號(hào)： | MAX1459 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | 2線、4-20mA智能信號(hào)調(diào)理器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | MAX1459 |
M
The output mux facilitates the test system to monitor dif-
ferent voltages through the output pin.
READ EEPROM MATRIX Command (E hex)
The contents of the entire 128-bit EEPROM is available
on DIO upon issuing this command. Once the
MAX1459 receives the READ EEPROM MATRIX com-
mand, DIO turns into an output for the next 128 clock
cycles. After the 128th clock cycle, DIO returns to its
default input mode and the MAX1459 is ready to
accept new commands (Figure 11). Data on DIO
changes on falling edges of SCLK and is stable on ris-
ing edges of SCLK.
The EEPROM data on DIO is eight 16-bit words, MSB to
LSB. The sequence is then 0F hex, 0E hex, 0D hex, …,
00 hex (word 0), 1F hex, 1E hex, 1D hex, … (word 1),
…, 7F hex, 7E hex, …, 70 hex (word 7).
__________Applications Information
Power-Up
At power-up, the following occurs:
1) The DAC and configuration registers are reset to
zero.
2) CS transitions from low to high after power-up (an
internal pull-up resistor ensures that this happens if
CS is left unconnected), and the EEPROM contents
are read and processed.
3) The DAC and configuration registers are updated
either once (if WE is logic 0) or approximately 400
times per second (if WE is logic 1).
4) The MAX1459 begins accepting commands in a ser-
ial format on DIO immediately after receiving the INIT
SEQUENCE command.
The MAX1459
must
be programmed for proper opera-
tion.
Compensation Procedure
The following compensation procedure was used to
obtain the results shown in Table 7 and Figure 12. It
assumes a pressure transducer with a +5V supply and
an output voltage that is ratiometric to the supply volt-
age. The desired offset voltage (V
OUT
at P
MIN
) is 0.5V,
and the desired FSO voltage (V
OUT(P
MAX
)
- V
OUT(P
MIN
)
)
is 4V; thus, the FSO voltage (V
OUT
at P
MAX
) will be 4.5V
(Figure 1). The procedure requires a minimum of two
2-Wire, 4–20mA
Smart Signal Conditioner
14
______________________________________________________________________________________
SCLK
DIO
COMMAND
MSB
LSB
LSB
MSB
MSB
LSB
DATA
8 HEX, 9 HEX, A HEX, B HEX, C HEX, OR D HEX WRITE REGISTER COMMAND
D9
D6
D8
D5
D7
D4
D3
D2
D1
D0
CM3
CM0
CM2
D11
CM1
D10
COMMAND
DATA
X
X
X
X
X
X
X
X
X
X
1
1
1
X
1
X
MSB
LSB
16 BIT CONTROL WORD - LOAD REGISTER COMMAND (FXXX HEX)
Figure 10. Timing Diagram for Write Register Operations
MUX
VALUE
D1
D0
OUTPUT
0 (default
power-up)
0
0
Conditioned Output Voltage
(PGA)
1
2
3
0
1
1
1
0
1
Sensor Bridge Voltage (V
B
)
Current-Source Voltage (V
SPAN
)
Power Supply Voltage (V
DD
)
Table 6. Output Mux Selection
SCLK
DIO
COMMAND
MSB
LSB
LSB
MSB
MSB
LSB
DATA
16-BIT CONTROL WORD - READ EEPROM MATRIX COMMAND (EXXX)
X
X
X
X
X
X
X
X
X
X
1
0
1
X
1
X
2F
20
2E
7F
7E
70
CM3 CM2 D0
CONTROL
WORD
0F
1F
0E
1E
00
10
16 CLOCK
CYCLES
16 CLOCK
CYCLES
DIO IS AN OUTPUT PIN FOR
128 CLOCK CYCLES
16 CLOCK
CYCLES
16 CLOCK
CYCLES
16 CLOCK
CYCLES
WORD 0
MSB
LSB
MSB
WORD 1
LSB
MSB
WORD 2
LSB
MSB
WORD 7
LSB
Figure 11. Timing Diagram for Reading the Entire EEPROM Content
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