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SBOS344 − SEPTEMBER 2005
VS
2.5V
Nonlinear
Bridge
Transducer
Ref
Linearization
Circuit
P
XTR117
PGA309
IO
VREG
+5V
Regulator
V+
7
psi
0
50
Lin DAC
8
Analog Sensor Linearization
B
6
Q1
ROS
RIN
Ω
125k
Ω
25k
IIN
Fault
Monitor
Linear
VOUT
VLOO P
Over/Under
Scale Limiter
Auto−Zero
PGA
(1)
2
A1
E
5
Analog Signal Conditioning
+125_C
−40_C
RL
RLIM
IRET
3
Digital
Temperature
Compensation
Int Temp
T
IO = 100VIN
RIN
R2
25Ω
R1
2.475k
Temp
ADC
Control Register
Interface Circuitry
Ω
Ext Temp
Ext Temp
4
EEPROM
(SOT23−5)
Digital Calibration
NOTE: (1) PGA309 VOUT: 0.5V to 4.5V.
Figure 5. Complete 4-20mA Pressure Transducer Solution with PGA309 and XTR117
8
TI [ TEXAS INSTRUMENTS ]
