The LMP91002 device is a programmable Analog Front End (AFE) for use in micro-power electrochemical-sensing applications. It provides a complete signal path solution between a not biased gas sensor and a microcontroller generating an output voltage proportional to the cell current.
The LMP91002’s programmability enables it support not biased electro-chemical gas sensor with a single design. The LMP91002 supports gas sensitivities over a range of 0.5 nA/ppm to 9500 nA/ppm. It also allows for an easy conversion of current ranges from 5 μA to 750 μA full scale. The LMP91002’s transimpedance amplifier (TIA) gain is programmable through the I2C interface. The I2C interface can also be used for sensor diagnostics. The LMP91002 is optimized for micro-power applications and operates over a voltage range of 2.7 V to 3.6 V. The total current consumption can be less than 10 μA. Further power savings are possible by switching off the TIA amplifier and shorting the reference electrode to the working electrode with an internal switch.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LMP91002 | WSON (14) | 4.00 mm × 4.00 mm |
Changes from A Revision (March 2013) to B Revision
Changes from * Revision (March 2013) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | DGND | G | Connect to ground |
2 | MENB | D | Module Enable. Active Low |
3 | SCL | D | I2C Clock |
4 | SDA | D | I2C Data |
5 | NC | — | Do not connect. Not internally connected |
6 | VDD | P | Voltage supply |
7 | AGND | GND | Analog GND |
8 | VOUT | A | Analog voltage representing sensor output |
9 | C2 | A | Optional External component node 2 for TIA (filter capacitor or gain resistor) |
10 | C1 | A | Optional External component node 1 for TIA (filter capacitor or gain resistor) |
11 | VREF | A | External Reference voltage input |
12 | WE | A | Working Electrode of the sensor. |
13 | RE | A | Reference Electrode of the sensor. |
14 | CE | A | Counter Electrode of the sensor. |
— | DAP | GND | Die attached pad. Connect to GND. |