MLX90314_12 Datasheet, PDF (24/28 Pages) Melexis Microelectronic Systems – Programmable Sensor Interface

Figure 10. Application Example
MLX90314
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 MLX90314 and a bridge type
pressure sensor element. In this application, the
MLX90314 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 MLX90314 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
3901090314
Rev 008
Page 24
Apr/12