The LMP91000SDE/NOPB is a Programmable Analogue Front-End (AFE) for use in micro-power electrochemical sensing applications. It provides a complete signal path solution between a sensor and a microcontroller that generates an output voltage proportional to the cell current. The LMP91000"s programmability enables it to support multiple electrochemical sensors such as 3-lead toxic gas sensors and 2-lead galvanic cell sensors with a single design as opposed to the multiple discrete solutions. The LMP91000 supports gas sensitivities over a range of 0.5 to 9500nA/ppm. It also allows for an easy conversion of current ranges from 5 to 750µA full scale. The I²C interface can also be used for sensor diagnostics. An integrated temperature sensor can be read by the user through the VOUT pin and used to provide additional signal correction in the µC or monitored to verify temperature conditions at the sensor.
● <10µA Supply current (average over time)
● Cell conditioning current up to 10mA
● 900pA (maximum) Reference electrode bias current (85°C)
● Complete potentiostat circuit-to-interface to most chemical cells
● Programmable cell bias voltage
● Low-bias voltage drift
● 2.75 to 350kR Programmable TIA gain
● Sink and source capability
● Supported by WEBENCH sensor AFE designer
● Green product and no Sb/Br
