L9780 datasheet(1/56 Pages) STMICROELECTRONICS

Part #	L9780

Description	Wide range air fuel sensor control interface

PDF	56 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 56 page

This is information on a product in full production.

November 2014

DocID026356 Rev 3

1/56

L9780

Wide range air fuel sensor control interface

Datasheet

- production data

Features

 Voltage controlled current source (VCCS)

pump cell driver with selectable voltage clamp,

offset compensation, diagnostic (short to

battery) and 2 output channels

 Impedance measurement of reference cell

 10-bit multiplexed A/D converter

 Scaling amplifier with sample & hold and offset

compensation

 Control voltage amplifier with sample & hold

and offset compensation

 Synchronous or asynchronous functionality

selectable via SPI

 Heater FET driver with diagnostic (short to

battery, short to ground, open circuit)

 4 possible levels for clean current

 SPI with fault detection

 Digital input and outputs compatible with 5 V or

3.3 V voltage supply

 2 channels available to connect compensation

networks

 Short to battery diagnostic on functional ground

(pin SR)

 Short to battery/ground diagnostic on voltage

from reference cell (pin INRC)

 -5 V internal supply

 4 MHz internal oscillator

 Package: 48 pin LQFP

 Technology: BCD5s_70 V

Description

L9780 is an IC designed to interface a variety of

wide range air fuel sensors.

The device manages the oxygen pump of the

wide range air fuel sensor by means of a voltage

controlled current source (VCCS). The reference

for the VCCS is generated by a PI controller with

external compensation network in order to adapt

the device to different sensors. The user can

choose between two different networks using the

SPI interface. L9780 is fully compatible with most

sensors on the market.

The internal timing state machine automatically

manages all the operations needed for a right

sequencing of the measurement process. All the

main time values can be configured by SPI.

L9780 drives also an external FET used to control

the sensor heater. The device protects the sensor

and all the I/O against shorts and provides the

diagnosis by SPI.

LQFP48

Table 1. Device summary

Order code

Package

Packing

L9780

LQFP48

Tray

L9780TR

LQFP48

Tape and reel

www.st.com

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