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  • 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.

    Key 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
00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10339
      Wide range air fuel sensor control interface
      3.0
      868.4 KB
      PDF
      DS10339

      Wide range air fuel sensor control interface

Publications and Collaterals

    • Description Version Size Action
      Smart power solutions for car body applications 4.0
      3.38 MB
      PDF

      Smart power solutions for car body applications

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L9780
Active
LQFP 48 7x7x1.4 Automotive Ecopack2
L9780TR
Active
LQFP 48 7x7x1.4 Automotive Ecopack2

L9780

Package:

LQFP 48 7x7x1.4

Material Declaration**:

Marketing Status

Active

Package

LQFP 48 7x7x1.4

Grade

Automotive

RoHS Compliance Grade

Ecopack2

L9780TR

Package:

LQFP 48 7x7x1.4

Material Declaration**:

Marketing Status

Active

Package

LQFP 48 7x7x1.4

Grade

Automotive

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L9780TR Available at 1 distributors

Distributor availability ofL9780TR

Distributor Name
Region Stock Min. Order Third party link
ARROW AMERICA 6974 2400 Order Now

Distributor reported inventory date: 2020-08-08

Distributor Name

ARROW

Stock

6974

Min.Order

2400

Region

AMERICA Order Now

Distributor reported inventory date: 2020-08-08

Active
EAR99 NEC Tape And Reel LQFP 48 7x7x1.4 -40 125 MALAYSIA 3.9 / 1k
L9780 Available at 4 distributors

Distributor availability ofL9780

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4230 1 Order Now
ARROW EUROPE 1000 0 Order Now
MOUSER WORLDWIDE 1361 1 Order Now
Farnell Element14 EUROPE 1500 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

DIGIKEY

Stock

4230

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1361

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1500

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-09

Buy now
Active
EAR99 NEC Tray LQFP 48 7x7x1.4 -40 125 MALAYSIA 3.9 / 1k

L9780TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

3.9 / 1k

Distributor availability ofL9780TR

Distributor Name
Region Stock Min. Order Third party link
ARROW AMERICA 6974 2400 Order Now

Distributor reported inventory date: 2020-08-08

Distributor Name

ARROW

Stock

6974

Min.Order

2400

Region

AMERICA Order Now

Distributor reported inventory date: 2020-08-08

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

LQFP 48 7x7x1.4

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

3.9 / 1k

Country of Origin

MALAYSIA

L9780

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

3.9 / 1k

Distributor availability ofL9780

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4230 1 Order Now
ARROW EUROPE 1000 0 Order Now
MOUSER WORLDWIDE 1361 1 Order Now
Farnell Element14 EUROPE 1500 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

DIGIKEY

Stock

4230

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1361

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1500

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-09

ECCN (EU)

NEC

Packing Type

Tray

Package

LQFP 48 7x7x1.4

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

3.9 / 1k

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors