參數(shù)資料
型號(hào)： MAX1478
廠商： Maxim Integrated Products, Inc.
英文描述： 1% Accurate, Digitally Trimmed,Rail-to-Rail Sensor Signal Conditioner
中文描述： 1%精確度、數(shù)字校準(zhǔn)、滿擺幅傳感器信號(hào)調(diào)理器
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 210K
代理商： MAX1478
M
Writing to the Configuration and DAC Registers
When writing to the configuration register or directly to
the internal 12-bit DACs, the data field (D0–D11) con-
tains the data to be written to the respective register.
Note that all four DACs and the configuration register
can be updated without toggling the CS line. Every
register write command must be followed by a LOAD
REGISTER command.
__________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 or approximately 400 times per second
(as determined by the state of WE).
4) The MAX1478 begins accepting commands in a ser-
ial format on DIO immediately after receiving the INIT
SEQUENCE.
The MAX1478 is shipped with all memory locations in
the internal EEPROM uninitialized. Therefore, the
MAX1478
must
be programmed for proper operation.
Compensation Procedure
The following compensation procedure was used to
obtain the results shown in Figure 9 and Table 8. 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 full-scale output voltage (V
OUT
at P
MAX
)
will be 4.5V (see Figure 1). The procedure requires a
minimum of two test pressures (e.g., zero and full
scale) at two arbitrary test temperatures, T
1
and T
2
.
Ideally, T
1
and T
2
are the two points where we wish to
perform best linear fit compensation. The following out-
lines a typical compensation procedure:
1) Perform Coefficient Initialization
2) Perform FSO Calibration
3) Perform FSOTC Compensation
4) Perform Offset TC Compensation
5) Perform Offset Calibration
Coefficient Initialization
Select the resistor values and the PGA gain to prevent
overload of the PGA and bridge current source. These
values depend on sensor behavior and require some
sensor characterization data, which may be available
from the sensor manufacturer. If not, the data can be
generated by performing a two-temperature, two-pres-
sure sensor evaluation. The required sensor information
is shown in Table 6 and can be used to obtain the val-
ues for the parameters listed in Table 7.
Table 6. Sensor Information for Typical
PRT
Selecting R
ISRC
When using an external resistor, use the equation
below to determine the value of R
ISRC
, and place the
resistor between ISRC and V
SS
. Since the 12-bit FSO
DAC provides considerable dynamic range, the R
ISRC
value need not be exact. Generally, any resistor value
within ±50% of the calculated value is acceptable. If
both the internal resistors R
ISRC
and R
FTC
are used, set
the IRS bit at EEPROM address bit 7 high. Otherwise,
set IRS low and connect external resistors as shown in
Figure 10.
14
5
where Rb(T) is the sensor input impedance at tempera-
ture T1 (+25°C in this example).
R
Rb(T
k
k
ISRC
≈
≈
=
)
14
1
70
1% Accurate, Digitally Trimmed,
Rail-to-Rail Sensor Signal Conditioner
12
______________________________________________________________________________________
5k
at +25°C
TYPICAL
VALUES
Rb(T)
2600ppm/°C
Bridge Impedance
Bridge Impedance
Tempco
TCR
SENSOR
DESCRIPTION
PARAMETER
+1.5mV/V per
PSI at +25°C
-2100ppm/°C
+12mV/V at
+25°C
S(T)
Sensitivity
TCS
Sensitivity Tempco
O(T)
-1000ppm/°C
of FSO
Offset
OTC
Offset Tempco
0.1% FSO,
BSLF
S(p)
0 psi
10 psi
Sensitivity Linearity Error
as % FSO, BSLF
(Best Straight-Line Fit)
Minimum Input Pressure
Maximum Input Pressure
P
MIN
P
MAX
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