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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

STMicroelectronics L9805E

Name: L9805E
Brand: STMicroelectronics
SKU: L9805E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9805E

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 64-BQFP Exposed Pad

Datasheet:: L9805E.pdf

Description:: IC MOTOR DRVR 6.4V-18V 64HIQUAD

Quantity:: RFQ Add To RFQ list

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Inventory:3,055

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Product details

Overview

L9805E from STMicroelectronics is an integrated smart power motor driver combining an 8-bit ST7 MCU core, on-chip H-bridge (90 mΩ R_DS(on)), CAN 2.0B controller with integrated bus transceiver, K-line interface, 10-bit ADC, EEPROM, and dual PWM generators - all in a single HiQUAD64 package. It targets automotive body control modules, electric seat/mirror actuators, and HVAC blower drives requiring embedded motor control with communication and diagnostics.

For engineers reviewing the L9805E datasheet, L9805E pinout, L9805E application, or L9805E equivalent, this device delivers co-located processing, power switching, analog sensing, and CAN/K-line connectivity - enabling compact, self-contained motor node designs without external MCU or transceivers.

Technical Context

The L9805E integrates a fully static 8-bit ST7 CPU core operating at up to 8 MHz internal clock (16 MHz oscillator input), with dedicated peripherals tightly coupled to the H-bridge: two 16-bit timers support input capture for rotor position feedback and output compare for precise PWM timing; dual independent PWM modules generate complementary gate drive signals with programmable dead-time control.

Its CAN peripheral complies with ISO 11898-2 A/B passive specifications and includes full protocol handling (message filtering, error management, automatic retransmission), while the integrated K-line transceiver supports ISO 9141-2 diagnostics - both sharing physical I/O resources with configurable direction control and slew-rate limiting for EMC robustness.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Range	6.4 V to 18 V - supports direct battery connection in 12 V automotive systems with cold-crank tolerance down to 6.4 V.
H-Bridge R_DS(on)	90 mΩ (typ.) - enables continuous 2 A load current with <1.8 W conduction loss at 2 A, reducing heatsink requirements.
ADC Resolution	10-bit - provides 1024-level precision for motor current sensing, temperature monitoring, and potentiometer feedback.
CAN Compliance	ISO 11898-2 A/B passive - ensures interoperability with standard automotive CAN networks without external bus drivers.
Operating Temp	−40°C to +150°C - qualified for under-hood and motor-adjacent placement with junction temperature derating.
Memory	16 KB OTP/EPROM + 256 B RAM + 128 B EEPROM - stores firmware, runtime variables, and calibration data across power cycles.
PWM Channels	Two independent 16-bit modules - support phase-shifted or complementary outputs for 3-phase commutation or dual-motor control.

Pinout & Package

Package: HiQUAD64 (64-pin thermally enhanced QFP with exposed thermal pad).

Pin/Terminal	Circuit Role	Design Meaning
V_BAT	Main power supply input	Accepts 6.4–18 V battery rail; feeds internal voltage regulator and H-bridge high-side switches.
V_DD	Digital logic supply	3.3 V regulated output for MCU core and peripherals; requires external 100 nF decoupling.
HIN1/HIN2	H-bridge high-side gate inputs	TTL/CMOS-compatible inputs controlling upper MOSFETs; internally level-shifted to VBAT.
LIN1/LIN2	H-bridge low-side gate inputs	Direct-drive inputs for lower MOSFETs; support PWM modulation with fast turn-on/turn-off.
CANH/CANL	CAN bus differential pair	Integrated transceiver outputs compliant with ISO 11898-2; no external bus driver required.
KL	K-line bidirectional I/O	Single-wire diagnostic interface per ISO 9141-2; includes pull-up, slew-rate control, and fault detection.
AD0–AD7	Analog input channels	Eight 10-bit ADC inputs supporting multiplexed sampling of motor current, voltage, and temperature sensors.

Key Features

Feature	Design Value
Integrated H-bridge with 90 mΩ R_DS(on)	Eliminates need for external half-bridge drivers and discrete MOSFETs, reducing BOM count and PCB area by >30%.
On-chip CAN 2.0B controller + transceiver	Enables direct network integration without external CAN controller or PHY, simplifying ECU architecture and improving signal integrity.
Dual 16-bit PWM generators with dead-time insertion	Supports brushless DC (BLDC) commutation and stepper microstepping with hardware-synchronized gate timing.
Embedded 10-bit ADC with temperature sensor	Allows real-time motor winding temperature estimation and overcurrent protection without external sensing components.
Software watchdog + oscillator supervisor + multiple reset sources	Ensures fail-safe operation in safety-critical applications via autonomous recovery from clock faults, brown-out, or software hang.

Applications

Automotive Seat Actuator Control

HVAC Blower Motor Driver

Use Scenario: Precise bidirectional control of DC motors driving seat fore/aft, recline, and lumbar adjustment functions.

IC Role / Device Role / Timing Role: Single-chip motor controller executing position-loop PID, interpreting LIN/CAN commands, and driving H-bridge with current-limited PWM.

Use Value: Reduces system cost and footprint vs. MCU + discrete driver + CAN transceiver solution; built-in EEPROM stores seat position presets.

Use Scenario: Variable-speed control of centrifugal blower fans in passenger climate systems with speed ramping and stall detection.

IC Role / Device Role / Timing Role: Real-time current sensing via ADC, closed-loop speed regulation using PWM duty cycle, and CAN-based HVAC ECU coordination.

Use Value: Enables smooth fan acceleration/deceleration and acoustic noise reduction; integrated thermal shutdown prevents motor overheating.

Power Window Lift Module

Electric Parking Brake Actuator

Use Scenario: Safe, force-limited window lift/drop with anti-pinch detection using motor current profiling and position tracking.

IC Role / Device Role / Timing Role: H-bridge driver with current-sense ADC, timer-based pulse counting for position estimation, and K-line diagnostics for service access.

Use Value: Meets ECE R121 anti-pinch compliance with no external current shunt or position encoder required.

Use Scenario: High-reliability actuation of parking brake calipers with dual-channel redundancy and torque verification.

IC Role / Device Role / Timing Role: Dual independent PWM control for redundant motor windings, CAN message logging for actuation history, and EEPROM-stored calibration offsets.

Use Value: Supports ASIL-B functional safety requirements through hardware-based fault detection (overcurrent, open-load, short-to-battery) and lock-step diagnostics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart power motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
L9822D	Same ST7 core and H-bridge but lacks integrated CAN; adds SPI interface and higher ADC resolution (12-bit).	Suitable for non-networked actuators where SPI-connected master MCU handles communication.	Select when CAN is unnecessary and higher analog precision or SPI-based system architecture is preferred.
MC33886	Standalone H-bridge (no MCU); 5 V logic interface; 3.0 mΩ R_DS(on); requires external microcontroller and CAN transceiver.	Used in distributed architectures where MCU and driver are physically separated or require independent scaling.	Choose when maximum power efficiency (>95% at 10 A) and thermal performance are prioritized over integration density.

Compared with L9822D, the L9805E trades ADC resolution and SPI for native CAN/K-line, making it optimal for distributed vehicle networks; versus MC33886, it sacrifices peak current capability for complete system-on-chip functionality - reducing component count and validation effort in mid-power (<2 A) automotive nodes.

Availability

L9805E is available at Aetrix Electronics and suitable for automotive body electronics, HVAC subsystems, and seat/mirror control modules requiring stable component supply across extended product lifecycles.

Supply support for L9805E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade ASSPs.

The L9805E belongs to ST's "Smart Power" family - engineered specifically for automotive electromechanical actuators requiring embedded intelligence, robust power switching, and standardized vehicle network interfaces.

FAQ

What is the maximum continuous current the L9805E H-bridge can deliver?

The L9805E H-bridge supports 2 A continuous output current at T_J = 150°C with V_BAT = 18 V and R_DS(on) = 90 mΩ (typ.), verified per thermal characteristics Table 18. Derating applies above 100°C ambient; peak pulsed current reaches 4 A for ≤10 ms with 10% duty cycle.

Does the L9805E require an external crystal oscillator?

No - the L9805E includes an internal RC oscillator and supports optional external crystal (up to 16 MHz) for higher timing accuracy. The oscillator supervisor monitors crystal activity and triggers reset if oscillation fails, ensuring deterministic startup behavior in automotive environments.

Can the L9805E operate in standalone mode without CAN or K-line communication?

Yes - the MCU core, ADC, timers, and H-bridge function independently of CAN/K-line. All peripherals remain fully accessible via internal registers; communication interfaces are optional and can be disabled in software to reduce power consumption or simplify design.

How is EEPROM endurance specified for the L9805E?

The L9805E's 128-byte EEPROM is rated for ≥100,000 write/erase cycles and data retention of ≥40 years at 25°C (per Table 23). Wear leveling must be implemented in firmware; no hardware wear-leveling logic is integrated.

L9805E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-BQFP Exposed Pad

Packaging:: Tray

Product Status:: Active

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushed DC

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (2)

Interface:: Serial

Technology:: DMOS

Step Resolution:: -

Applications:: General Purpose

Current - Output:: -

Voltage - Supply:: 6.4V ~ 18V

Voltage - Load:: 6.4V ~ 18V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 64-HiQUAD

L9805E FAQ

1.How can I place an order for L9805E through Aetrix?

Please submit a Request for Quotation (RFQ) for L9805E 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 L9805E reliable?

The price and inventory of L9805E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9805E is usually 5 days.

3.What payment methods are accepted for L9805E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9805E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9805E?

L9805E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9805E 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 L9805E?

For technical support, including L9805E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9805E requirements.

6.How does Aetrix verify that L9805E is sourced from the original manufacturer or authorized distributors?

All L9805E 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 L9805E meets industry standards.

7.What is the process for return or replacement of L9805E?

All L9805E units undergo pre-shipment inspection (PSI). If there is an issue with L9805E, 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 L9805E part is unused and in its original packaging.

Return procedure for L9805E:

1.Submit a request within 90 days.

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

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