AN884 Datasheet, PDF (4/6 Pages) Maxim Integrated Products – Miniature Flow Sensor Has Electronic Temperature Compensation

The output signal is adjustable between 0.5V and 4.5V (when operating with 5V supplies), and
it accommodates sensor sensitivities of 10mV/V and higher. All coefficients required for
compensation are held in an EEPROM internal to the MAX1458. Thus, the setup is easily and
automatically calibrated via a simple 4-wire serial interface.
Because the relationship between measured differential pressure and liquid flow rate depends
on the liquid's viscosity, which in turn changes with temperature, the MAX1458 provides a
temperature output signal for use in external signal processing. This setup (Figure 4) allows the
measurement of flow rates no higher than 5.5µl/sec. The analog pressure signals, the
temperature sensor terminals, and all other connections are made accessible at a connector for
external post?processing.
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