AN839| Application Note
Maxim/Dallas > App Notes > SENSOR SIGNAL CONDITIONERS Keywords: high performance, low cost, signal conditioner, precision sensor signal conditioner, analog signal conditioner, PRT sensor compensation, thick film, thin film, sensor compensation, strain gauge sensor compensation, output clipping, diagnostics
Nov 01, 2001
APPLICATION NOTE 839
MAX1452 Diagnostic Clip Circuit
In many applications, particularly in automotive application, limiting the transducer output to some predefined values, also referred to as output clipping, can serve as an important diagnostic tool. The MAX1455 low-cost high-performance signal conditioner has the clipping function built in. A simple method of implementing an external output clipping function to the MAX1452 signal conditioner has been presented here. This is accomplished by adding few resistors and utilizing the on-chip uncommitted op amp. The MAX1452 (Figure 1) output signal is an analog voltage that can range from the VDD rail to the VSS rail. The part can be configured to limit (clip) its output voltage to aid in system level diagnostics in sensor applications. This capability can detect open or short circuits caused by wiring or connector falures, and can detect sensor failures. Forced clipping can be accomplished by using the integrated uncommitted op-amp and a few external resistors. The clip voltage range can be set to be symmetrical
or asymmetrical to the supply voltages. The clip voltages are fully ratiometric to the supply voltages, maintaining the ratiometric performance of the system.
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