My Inquiry
My Account
STMicroelectronics AEK-LED-21DISM1
- Part No.:
- AEK-LED-21DISM1
- Manufacturer:
- STMicroelectronics
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
AEK-LED-21DISM1.pdf
- Description:
- EVAL BOARD FOR L99LD21
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AEK-LED-21DISM1 from STMicroelectronics is an AutoDevKit-compliant evaluation board integrating two L99LD21 high-power LED drivers to control four independent LED channels (1.4 A, 0.4 A, 1.4 A, 0.12 A) for automotive front lighting. It operates from 5.5 V to 24 V, supports SPI-based current programming, and implements automotive-grade protections including open-load/short-circuit detection, overtemperature shutdown, battery undervoltage monitoring, and Limp-Home Mode for fail-safe low-beam and turn-indicator operation.
For engineers reviewing the AEK-LED-21DISM1 datasheet, AEK-LED-21DISM1 pinout, AEK-LED-21DISM1 application, or AEK-LED-21DISM1 equivalent, this board serves as a production-representative reference for digitally controlled, dual-phase boost+buck LED driver systems targeting high-beam, low-beam, DRL, and fog light subsystems in ISO 26262-aligned automotive designs.
Technical Context
The board implements a stacked dual-phase boost architecture using two L99LD21 ICs, where each integrates a high-current gate driver for external N-channel MOSFETs and delivers regulated output voltage to two internal buck converters. The interleaved boost operation reduces input current ripple and enables balanced load sharing across phases for high-power lighting loads up to 50 W per channel.
Each buck converter integrates an N-channel MOSFET with bootstrap gate drive and supports PWM dimming via 10-bit resolution. SPI communication (CSN0/CSN1, SDO/SDI, SCK, DIN) enables real-time register access to control logic, diagnostics, and trimming - including dedicated watchdog supervision of MCU communication to enforce Limp-Home safety state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Board dimensions | 81 mm × 100 mm footprint with ≤11 mm component height - fits standard automotive ECU mounting envelopes and thermal clearance zones. |
| Input voltage range | 5.5 V to 24 V DC - compatible with 12 V and 24 V vehicle electrical systems including cold-crank (≥5.5 V) and load-dump transient margins. |
| Max channel current | 1.4 A per channel (two channels), 0.4 A and 0.12 A (two channels) - supports mixed-string configurations for asymmetric beam patterns (e.g., high/low + DRL + position). |
| Control interface | SPI with dual chip select (CSN0/CSN1) - enables independent configuration and status polling of both L99LD21 drivers without bus contention. |
| Protections | Open-load, short-circuit, overtemperature, battery undervoltage, and watchdog-monitored communication loss - ensures ASIL-B–aligned fault containment per ISO 26262. |
| Limp-Home Mode | Hardware-enforced fallback to preconfigured safe-output state upon SPI timeout - preserves critical lighting functions (e.g., low-beam) during MCU failure or firmware hang. |
Availability
AEK-LED-21DISM1 is available at Aetrix Electronics and suitable for automotive LED front lighting development, AutoDevKit-based rapid prototyping, and functional safety validation requiring stable component supply and traceable automotive-grade sourcing.
Supply support for AEK-LED-21DISM1 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 specializing in automotive, industrial, and power management solutions, with broad expertise in analog, mixed-signal, and embedded processing technologies.
AEK-LED-21DISM1 belongs to ST's AutoDevKit ecosystem - a family of modular, interoperable evaluation platforms designed to accelerate development of ASIL-compliant automotive subsystems using standardized interfaces and SPC5 MCU integration.
FAQ
What microcontrollers are supported for SPI control of AEK-LED-21DISM1?
The board is natively supported by SPC5-family MCUs via the AutoDevKit plugin for SPC5-Studio. Firmware drivers are pre-integrated and validated for SPC56EL, SPC572L, and SPC58NG series. External MCUs with standard 3.3 V SPI (mode 0, 10 MHz max) can also interface using the 12-pin male connector, provided they meet timing and voltage level requirements specified in DB3929.
Does AEK-LED-21DISM1 support dual-phase interleaved boost operation out of the box?
Yes - JP2 and JP3 jumpers configure synchronization between the two L99LD21 boost controllers for interleaved phase operation. When enabled, the boards share SYNC_IO signals to achieve 180° phase shift, reducing input capacitor RMS current and improving thermal distribution across the boost stage for sustained >50 W total output power.
How is Limp-Home Mode triggered and what outputs remain active?
Limp-Home Mode activates automatically after three consecutive SPI communication timeouts monitored by the internal watchdog. In this mode, the board maintains pre-programmed current levels on designated channels - typically the 1.4 A low-beam and 0.12 A position-light outputs - while disabling non-critical strings like high-beam or DRL to preserve minimum legal illumination.
Can AEK-LED-21DISM1 be used for rear lighting applications such as brake or turn signals?
While optimized for front lighting, the board supports rear applications requiring high-current, digitally controlled LED drivers - e.g., adaptive brake lights or dynamic turn indicators. Its 0.4 A and 0.12 A channels match typical rear string requirements, and Limp-Home Mode ensures fail-operational behavior for legally mandated functions when integrated with appropriate optical and thermal design.
AEK-LED-21DISM1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- AutoDevKit
- Packaging:
- Bulk
- Product Status:
- Active
- Current - Output / Channel:
- 1.69A
- Outputs and Type:
- 2 Non-Isolated Outputs
- Voltage - Output:
- -
- Features:
- -
- Voltage - Input:
- 5.5V ~ 24V
- Contents:
- Board(s)
- Utilized IC / Part:
- L99LD21
AEK-LED-21DISM1 FAQ
1.How can I place an order for AEK-LED-21DISM1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AEK-LED-21DISM1 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 AEK-LED-21DISM1 reliable?
The price and inventory of AEK-LED-21DISM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AEK-LED-21DISM1 is usually 5 days.
3.What payment methods are accepted for AEK-LED-21DISM1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AEK-LED-21DISM1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AEK-LED-21DISM1?
AEK-LED-21DISM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AEK-LED-21DISM1 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 AEK-LED-21DISM1?
For technical support, including AEK-LED-21DISM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AEK-LED-21DISM1 requirements.
6.How does Aetrix verify that AEK-LED-21DISM1 is sourced from the original manufacturer or authorized distributors?
All AEK-LED-21DISM1 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 AEK-LED-21DISM1 meets industry standards.
7.What is the process for return or replacement of AEK-LED-21DISM1?
All AEK-LED-21DISM1 units undergo pre-shipment inspection (PSI). If there is an issue with AEK-LED-21DISM1, 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 AEK-LED-21DISM1 part is unused and in its original packaging.
Return procedure for AEK-LED-21DISM1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AEK-LED-21DISM1 Tags
-
COM-13716
SparkFun Electronics
-
B-G474E-DPOW1
STMicroelectronics
-
EVB81116-A2
Melexis Technologies NV
-
EVB81116-A3
Melexis Technologies NV
-
LP5036EVM
Texas Instruments
-
LP5813-12WCSPEVM
Texas Instruments
-
LP8863EVM
Texas Instruments
-
1455
Adafruit Industries LLC
-
1427
Adafruit Industries LLC
-
WIG-13279
SparkFun Electronics
-
5650
Adafruit Industries LLC
-
1429
Adafruit Industries LLC
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
