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Home > Products > Integrated Circuits (ICs) > Interface > Sensor and Detector Interfaces

STMicroelectronics L9966CB-TR

Name: L9966CB-TR
Brand: STMicroelectronics
SKU: L9966CB-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9966CB-TR

Manufacturer:: STMicroelectronics

Category:: Sensor and Detector Interfaces

Package:: 48-TQFP Exposed Pad

Datasheet:: L9966CB-TR.pdf

Description:: FLEXINPUT IC FOR AUTOMOTIVE APPL

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Product details

Overview

L9966CB-TR from STMicroelectronics is an automotive FlexInput sensor-interface IC designed for engine control units, body modules, chassis modules, and other automotive control systems. The device provides up to 15 programmable input channels for analog sensing, resistance measurement, digital switch sensing, lambda sensor support, SENT-related functions, variable reluctance sensor or Hall sensor interfacing, and SPI-based configuration and data communication.

For engineers reviewing the L9966CB-TR datasheet, L9966CB-TR pinout, L9966CB-TR application, or L9966CB-TR equivalent, this IC is most relevant for automotive ECU sensor front ends requiring 5.5 V to 36 V battery operation, AEC-Q100 qualification, 12-bit voltage measurement, 15-bit resistance measurement, programmable pull-up / pull-down current sources, 1 analog output, 4 digital outputs, 10 MHz SPI communication, and TQFP-EP 48 tape-and-reel assembly.

Technical Context

L9966CB-TR is built around a flexible automotive input architecture with 12 channels for external analog loads and 3 channels for external digital switches. Channels IO1 to IO4 can also support SENT functionality, while IO9 to IO12 add lambda sensor functionality. The device integrates programmable current sources referenced to VPRE, VDD5, or VVAR, allowing the same PCB hardware to be adapted across different sensor and switch configurations through SPI register settings.

The device includes a 12-bit ADC for voltage measurements and a 15-bit ADC for resistance measurements, supporting temperature, pressure, position, switch, and resistive sensor acquisition in automotive modules. Operating ranges cover normal battery operation from 7.5 V to 36 V and low-battery operation down to 5.5 V, while protection and diagnostic features include overtemperature protection, ESD robustness, reset handling, interrupt signaling, sleep / polling wake behavior, and SPI transfer-fault reporting.

Key Specifications

Parameter	Value and Actual Design Meaning
Device Type	Automotive FlexInput sensor-interface IC for analog sensing, resistance measurement, digital switch sensing, and configurable ECU input management.
Automotive Qualification	AEC-Q100 qualified and intended for automotive 12 V and 24 V system environments.
Input Channel Count	15 total programmable inputs, allowing one device to handle several sensor and switch interface combinations.
Analog Load Inputs	12 inputs for external analog loads with connection options to VVAR, VDD5, and clamped battery VPRE, plus resistance measurement support.
Digital Switch Inputs	3 inputs for external digital switches with connection to VPRE, supporting body and chassis switch-monitoring functions.
Lambda / SENT Functions	4 channels with lambda sensor functionality and 4 channels with SENT functionality, supporting mixed automotive sensor interface requirements.
Battery Supply Range	5.5 V to 36 V operating battery supply range, covering low-battery and normal 12 V / 24 V vehicle system conditions.
5 V Supply Range	VDD5 operates with 4.85 V to 5.15 V in full-accuracy normal conditions and with 4.0 V to 4.85 V in low-VDD5 operating conditions.
Voltage Measurement	12-bit ADC for voltage measurements across configured input channels.
Resistance Measurement	15-bit ADC for precise resistance measurement using the reference pull-up resistor pins and selected input channels.
Current Sources	Programmable pull-up and pull-down current sources, with pull-down current options ranging from microampere-level sensing currents to 20 mA typical dewetting-capable current drive.
Sensor Interface Support	Variable reluctance sensor / Hall sensor interface through VRSP, VRSN, and VRS_OUT functions.
Output Resources	1 analog output channel through AOX and 4 digital SENT / GTM output channels through SENT1_GTM1 to SENT4_GTM4.
Communication Interface	SPI interface for device configuration and data communication, designed for operation up to 10 MHz SCLK with 32-bit frame access and burst read / write support.
Low-Power Behavior	Sleep and polling operation support wake-source monitoring while reducing current consumption from the permanent UBSW supply.
Thermal Data	Operating junction temperature range from -40°C to +150°C, with 3°C/W junction-to-case-bottom thermal resistance.
ESD Robustness	HBM ±4000 V on global pins, HBM ±2000 V on all pins, CDM ±750 V on corner pins, and CDM ±500 V on all pins.
Package	TQFP-EP 48 package, 7 mm × 7 mm body, 1.0 mm class height, exposed pad down, supplied in tape-and-reel format.

Pinout & Package

L9966CB-TR is supplied in a TQFP-EP 48 exposed-pad package with a 7 mm × 7 mm body, 0.50 mm lead pitch, and exposed pad for board-level thermal and ground connection. The package supports dense ECU input routing by separating reference resistor pins, VRS inputs, analog / digital flexible inputs, SENT / GTM outputs, SPI pins, battery supply, 5 V supply, reset, interrupt, wake, and synchronization pins around a compact automotive-qualified footprint.

Pin / Terminal	Circuit Role	Design Meaning
Pins 1-3 - RR3, RR2, RR1	Reference pull-up resistor inputs for resistance measurement.	Connect external reference resistor networks used by the resistance-measurement function.
Pin 4 - R_GND	Reference ground for high-accuracy signals.	Provides the precision ground reference for ADC-related dividers and resistance-measurement paths.
Pins 5-6 - VRSP, VRSN	Positive and negative variable reluctance sensor inputs.	Interface to variable reluctance or Hall-related sensing paths used in engine or motion-related measurement systems.
Pin 7 - GND	Supply ground.	Provides the main ground reference for the IC supply system.
Pin 8 - VDD5REF	Positive reference for both ADC sections.	Defines the precision reference used for voltage and resistance measurement accuracy.
Pin 9 - AOX	Analog output channel.	Provides the routed analog output from a selected input channel according to device configuration.
Pin 10 - VT5V, Pin 12 - VI5V	Ratiometric 5 V output and input-voltage sense pair.	Supports 5 V-referenced voltage sensing and ratiometric output behavior for selected sensor-interface configurations.
Pin 11 - VRS_OUT	Digital output of variable reluctance sensor interface.	Provides the processed VRS / Hall-related digital output signal to the controller side.
Pin 14 - VTX, Pin 15 - VIX	Ratiometric VIX output and input-voltage sense pair.	Supports voltage-sense and ratiometric output functions for configurable sensor-interface routing.
Pin 16 - CTRL_CFG	Current-source control input and SPI address-mux configuration input during reset.	Controls current-source behavior and supports hardware address multiplexing for systems sharing SPI resources.
Pins 17-19 - IO_13, IO_14, IO_15	Flexible digital input and current-output channels.	Provide configurable digital switch input and current-source functions for external ECU signals.
Pins 20-23 - IO_1, IO_2, IO_3, IO_4	Flexible input and current-output channels with SENT capability.	Support analog load sensing, current-source operation, and SENT-related input functionality for up to four channels.
Pins 25-28 - SENT4_GTM4, SENT3_GTM3, SENT2_GTM2, SENT1_GTM1	Digital SENT / GTM output pins.	Provide the digital output paths associated with the SENT / GTM routing functions.
Pin 29 - INT	Interrupt output.	Signals result status or fault-related events to the host controller.
Pin 30 - VDD5V	5 V power supply input.	Supplies the 5 V-related internal and I/O functions within the specified VDD5 operating range.
Pin 31 - SYNC	Sequencer synchronization input.	Synchronizes the start of the internal sequencer with the host system timing requirement.
Pins 32-35 - MISO, MOSI, CS, SCLK	SPI communication pins.	Provide the serial interface used for configuration, status readback, measurement data communication, and diagnostic reporting.
Pin 36 - RST	Reset input.	Controls reset entry and device startup behavior before the IC enters normal operation.
Pins 39-42 - IO_12, IO_11, IO_10, IO_9	Flexible input and current-output channels with lambda functionality.	Support analog sensing, resistance measurement, current-source operation, and lambda-related sensor-interface functions.
Pins 43-46 - IO_8, IO_7, IO_6, IO_5	Flexible analog input and current-output channels.	Provide configurable analog load sensing and current-source functions for additional ECU external signals.
Pin 47 - WAKE	Wake output.	Supports low-power wake signaling when configured input polling detects a defined wake condition.
Pin 48 - UBSW	Battery supply input.	Supplies the IC from the protected automotive battery rail over the 5.5 V to 36 V operating range.
Pins 13, 24, 37, 38	No-connect terminals.	These pins provide no functional external signal connection and should not be used as active circuit nodes.

Key Features

Automotive FlexInput IC for sensor and switch interface functions in engine, body, and chassis modules.
AEC-Q100 qualified device for 12 V and 24 V automotive system compatibility.
15 programmable inputs, including 12 analog-load channels and 3 digital-switch channels.
Supports resistance measurement, lambda-related inputs, SENT-related channels, and variable reluctance sensor / Hall sensor interfacing.
Programmable pull-up and pull-down current sources with selectable reference rails and dewetting-related current behavior.
12-bit ADC for voltage measurement and 15-bit ADC for resistance measurement.
SPI interface up to 10 MHz for configuration, measurement readback, status reporting, and diagnostic communication.
1 analog output channel, 4 digital output channels, interrupt output, wake output, reset input, and synchronization input.
TQFP-EP 48 7 mm × 7 mm exposed-pad package supplied in tape-and-reel format for automotive SMT production.

Applications

Engine Control Units	Body Control Modules
Use Scenario: Automotive ECUs that acquire pressure, position, temperature, lambda, variable reluctance, Hall, and resistive sensor signals. IC Role: Programmable sensor-interface IC with analog input, resistance measurement, current-source, and SPI readback functions. Use Value: L9966CB-TR allows different sensor input configurations to be handled through register settings, reducing the need for separate discrete front-end networks across ECU variants.	Use Scenario: Body modules monitoring switches, resistive inputs, and externally wired sensor or contact states. IC Role: Flexible digital and analog input manager with pull-up / pull-down current sources and wake-capable polling support. Use Value: The 15-channel architecture and sleep / polling behavior help body electronics monitor external signals while managing current consumption from the permanent battery supply.
Chassis Sensor Interfaces	Automotive Platform Reuse
Use Scenario: Chassis modules requiring configurable input stages for position, pressure, resistive, and digital sensor signals. IC Role: Multi-channel signal acquisition and diagnostic IC with ADC, current-source, and SPI reporting functions. Use Value: Resistance measurement, voltage measurement, interrupt signaling, and diagnostic status readback support robust sensor acquisition in harsh automotive electrical environments.	Use Scenario: Vehicle platforms where the same ECU PCB must support different sensor populations across multiple applications. IC Role: Programmable FlexInput interface that can reassign channel behavior through SPI configuration. Use Value: The device helps engineers reuse common PCB hardware while changing sensor type, input mode, current-source behavior, and measurement sequence through software configuration.

Engine Control Units

Body Control Modules

Use Scenario: Automotive ECUs that acquire pressure, position, temperature, lambda, variable reluctance, Hall, and resistive sensor signals.

IC Role: Programmable sensor-interface IC with analog input, resistance measurement, current-source, and SPI readback functions.

Use Value: L9966CB-TR allows different sensor input configurations to be handled through register settings, reducing the need for separate discrete front-end networks across ECU variants.

Use Scenario: Body modules monitoring switches, resistive inputs, and externally wired sensor or contact states.

IC Role: Flexible digital and analog input manager with pull-up / pull-down current sources and wake-capable polling support.

Use Value: The 15-channel architecture and sleep / polling behavior help body electronics monitor external signals while managing current consumption from the permanent battery supply.

Chassis Sensor Interfaces

Automotive Platform Reuse

Use Scenario: Chassis modules requiring configurable input stages for position, pressure, resistive, and digital sensor signals.

IC Role: Multi-channel signal acquisition and diagnostic IC with ADC, current-source, and SPI reporting functions.

Use Value: Resistance measurement, voltage measurement, interrupt signaling, and diagnostic status readback support robust sensor acquisition in harsh automotive electrical environments.

Use Scenario: Vehicle platforms where the same ECU PCB must support different sensor populations across multiple applications.

IC Role: Programmable FlexInput interface that can reassign channel behavior through SPI configuration.

Use Value: The device helps engineers reuse common PCB hardware while changing sensor type, input mode, current-source behavior, and measurement sequence through software configuration.

Equivalent & Alternatives

When evaluating L9966CB-TR equivalent devices, engineers should compare channel count, analog-load support, digital-switch support, resistance measurement, current-source programmability, lambda and SENT channel requirements, battery operating range, SPI behavior, AEC-Q100 grade, TQFP-EP 48 footprint, and whether the target design needs a broad FlexInput interface or a dedicated single-sensor interface.

Alternative Part	Technical Difference	Application Difference	Selection Advice
L9780TR	STMicroelectronics wide-range air-fuel sensor control interface in tape-and-reel format, focused on pump-cell control, impedance measurement, heater FET drive, diagnostics, and SPI control rather than the 15-channel FlexInput architecture of L9966CB-TR.	Better suited for dedicated wide-range air-fuel sensor control where the circuit needs oxygen-pump and heater-driver functions instead of a broad programmable sensor-input matrix.	Select L9966CB-TR for multi-channel analog / digital / resistance input handling; consider L9780TR when the design requirement is a dedicated wide-range air-fuel sensor control interface.
L9780	Same L9780 air-fuel sensor interface function supplied in tray format, with an LQFP48 package and a different pinout and control architecture from L9966CB-TR.	Used when tray handling is preferred for a dedicated air-fuel sensor interface rather than an ECU FlexInput acquisition device.	Use only in designs built around the L9780 air-fuel sensor control architecture; it is not a pin-compatible substitute for L9966CB-TR.

Compared with L9780TR, L9966CB-TR is optimized for flexible multi-channel ECU input acquisition rather than a dedicated wide-range air-fuel sensor control loop. L9966CB-TR vs L9780TR selection depends on whether the design needs 15 configurable input channels with resistance and voltage measurement, or a specialized air-fuel sensor interface with heater and pump-cell control.

Quality

L9966CB-TR should be sourced as original STMicroelectronics components through traceable and controlled supply channels. Quality verification procedures may include TQFP-EP 48 package inspection, top-mark validation, tape-and-reel label review, solderability testing, exposed-pad inspection, AEC-Q100 and ECOPACK2 documentation review, SPI communication checks, channel-input continuity testing, ADC measurement verification, current-source function testing, interrupt / wake behavior testing, and incoming inspection according to automotive ECU production requirements.

Availability

L9966CB-TR is available at Aetrix Electronics and suitable for engine control units, body control modules, chassis modules, sensor acquisition boards, automotive switch-monitoring circuits, and configurable ECU input platforms requiring stable component supply and repeatable production support.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for automotive OEM programs, Tier-1 ECU manufacturers, contract manufacturers, repair groups, platform engineering teams, and legacy automotive electronics production programs.

For production deployment, confirming the TQFP-EP 48 footprint, tape-and-reel format, AEC-Q100 requirement, 5.5 V to 36 V battery range, VDD5 reference plan, SPI register configuration, channel assignment, sensor-interface mode, exposed-pad layout, environmental specifications, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

STMicroelectronics supplies automotive analog and power ICs, sensor-interface devices, microcontrollers, power-management ICs, protection products, RF components, and discrete semiconductors for automotive, industrial, communication, consumer, and embedded applications. L9966CB-TR belongs to ST's automotive special-function IC portfolio for programmable sensor and switch interfacing in ECU platforms.

FAQ

What is L9966CB-TR used for?

L9966CB-TR is used as an automotive sensor-interface IC in engine control units, body modules, chassis modules, and configurable ECU input systems. It handles analog sensing, resistance measurement, digital switch monitoring, lambda-related input functions, SENT-related functions, and VRS / Hall sensor interfacing through a programmable SPI-controlled architecture.

How many input channels does L9966CB-TR provide?

L9966CB-TR provides 15 total programmable inputs. Twelve channels can connect to external analog loads with resistance-measurement capability, and three channels are intended for external digital switches. Within the 12 analog-capable channels, four also support lambda sensor functionality and four also support SENT-related functionality.

What supply range does L9966CB-TR support?

L9966CB-TR is compatible with 12 V and 24 V automotive systems and supports an operating battery supply range from 5.5 V to 36 V. In normal full-accuracy operation, the UBSW battery supply is from 7.5 V to 36 V and the VDD5 supply reference is within the 4.85 V to 5.15 V range.

Which interface does L9966CB-TR use for configuration?

L9966CB-TR uses an SPI interface with MISO, MOSI, CS, and SCLK pins for configuration, measurement readback, status reporting, and diagnostic communication. The SPI interface is designed for clock operation up to 10 MHz and uses framed access with support for burst read and write operations.

Does L9966CB-TR support resistance measurement?

Yes. L9966CB-TR includes integrated precise resistance measurement using a 15-bit ADC and reference pull-up resistor inputs RR1, RR2, and RR3. This function is useful for automotive resistive sensors, switch networks, and configurable input circuits where the ECU must measure resistance values rather than only detect logic states.

What package is used by L9966CB-TR?

L9966CB-TR uses a TQFP-EP 48 exposed-pad package with a 7 mm × 7 mm body and 0.50 mm lead pitch. The exposed-pad package supports compact ECU layout, thermal transfer to the PCB, and stable grounding for the mixed analog, digital, current-source, and SPI sections of the IC.

Is L9966CB-TR automotive qualified?

Yes. L9966CB-TR is an AEC-Q100 qualified automotive-grade IC. It is intended for vehicle electronic control systems and includes automotive robustness features such as wide battery operation, ESD ratings, latch-up testing, overtemperature protection, diagnostic reporting, and low-power wake / polling behavior.

What are common L9966CB-TR alternatives?

For a broad 15-channel automotive FlexInput interface, L9966CB-TR is the matching ST orderable device. L9780TR and L9780 are ST comparison parts for dedicated wide-range air-fuel sensor control, but they use a different architecture and are not pin-compatible replacements for L9966CB-TR. Engineers should compare sensor type, channel count, measurement method, package, and firmware interface before changing the design.

L9966CB-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-TQFP Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Interface

Input Type:: Analog, Digital

Output Type:: SPI

Current - Supply:: -

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TQFP-EP (7x7)

L9966CB-TR FAQ

1.How can I place an order for L9966CB-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9966CB-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L9966CB-TR reliable?

The price and inventory of L9966CB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9966CB-TR is usually 5 days.

3.What payment methods are accepted for L9966CB-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9966CB-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9966CB-TR?

L9966CB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9966CB-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L9966CB-TR?

For technical support, including L9966CB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9966CB-TR requirements.

6.How does Aetrix verify that L9966CB-TR is sourced from the original manufacturer or authorized distributors?

All L9966CB-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9966CB-TR meets industry standards.

7.What is the process for return or replacement of L9966CB-TR?

All L9966CB-TR units undergo pre-shipment inspection (PSI). If there is an issue with L9966CB-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L9966CB-TR part is unused and in its original packaging.

Return procedure for L9966CB-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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