MLX90308CAB Datasheet, PDF (24/26 Pages) List of Unclassifed Manufacturers – Programmable Sensor Interface

Figure 10. Application Example
MLX90308CAB
Programmable Sensor Interface
Figure 10a. Programmable Oil Pressure Gauge
Communications
Signal Out
GND
V+
Programmable Oil Pressure Gauge
This application example illustrates a fundamental
application of the MLX90308 and a bridge type
pressure sensor element. In this application, the
MLX90308 uses an external FET as a pass transistor
to regulate the voltage to the sensor and the analog
portion of the IC. This is known as Absolute Voltage Mode,
where voltage to the sensor and analog circuit is regulated
independent of the supply voltage. The MLX90308 can be operated in
Ratiometric Voltage Mode, in which the output (VMO) is tied to an A/D
converter sharing the same supply and ground reference. A third wiring
option is Current Mode, which allows the user a 4 to 20 milliampere current range to
use as a 2-wire analog sensor.
Figure 10b. Programmable Oil Pressure Gauge Electrical Connections
Pressure
Sensor
1
IO1
2
IO2
3
TSTB
4
FLT
5
OFC
6
VBN
7
VBP
8
TMP
COMS
GND
CMN
CMO
VMO
VDD1
FET
VDD
Communication
16
s
GND
15
14
13
12
11
G
10
External FET
for Regulation
9
Oil
Pressure
(psi)
Signal Out
V
+
D
S
MLX90308CAB Programmable Sensor Interface
Page 24
Rev 3.0 21/May/01