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Allegro MicroSystems A6285EETTR-T
- Part No.:
- A6285EETTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
A6285EETTR-T.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,333
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Product details
Overview
A6285EETTR-T from Allegro MicroSystems is a 16-channel constant-current latched LED driver with open LED detection (LOD), 7-bit dot correction (DC), and active pull-up enable. It operates from 3.0–5.5 V logic supply, supports up to 80 mA per channel via external REXT, and delivers 30 MHz serial data input for LED display backlighting and full-color signage.
For engineers reviewing the A6285EETTR-T datasheet, A6285EETTR-T pinout, A6285EETTR-T application, or A6285EETTR-T equivalent, key selection criteria include LOD fault reporting via open-drain FAULT, staggered 20 ns output delay to suppress ground bounce, and MODE-selectable dual-shift-register architecture for independent on/off and DC programming.
Technical Context
The A6285EETTR-T integrates two independent 16-bit shift registers-one for ON/OFF control and one for 7-bit dot correction-each selectable via the MODE pin. Its BiCMOS architecture combines CMOS logic for microprocessor interfacing with MOS constant-current sinks capable of 80 mA per channel at VDS = 1 V.
It features integrated UVLO (2.5–2.95 V trip), thermal shutdown (TJ = 165 °C), and open-drain FAULT output that flags both LOD and TSD conditions. The PE pin enables/disables active pull-ups (2.8 mA typical), while REXT sets maximum current via internal 1.23 V bandgap reference and 38.4× current gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 16 constant-current sink outputs with individual on/off and 7-bit dot correction control |
| Max Output Current | 80 mA per channel (REXT = 600 Ω); adjustable down to 40 mA (REXT = 1.2 kΩ) |
| Logic Supply Range | 3.0–5.5 V; includes Power-On Reset (POR) and undervoltage lockout (UVLO) |
| Serial Data Rate | Up to 30 MHz clock frequency; supports cascading via SDO-to-SDI daisy chain |
| LED Open Detection | Detects open-circuit LEDs per channel; reports status via FAULT pin and serial SDO output |
| Thermal Protection | Thermal shutdown at 165 °C (typical) with 15 °C hysteresis; outputs disabled without latch reset |
| Stagger Delay | 20 ns typical delay between consecutive OUTx transitions to reduce ground bounce |
Pinout & Package
Package: 32-pin QFN (5 mm × 5 mm, 0.9 mm height), exposed thermal pad (ET suffix), lead-free with 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDI (1) | Serial Data Input | MSB-first data entry into selected shift register (ON/OFF or DC) based on MODE state |
| OUT0–OUT15 (3–4,6–16,17–22) | Constant-Current Sink Outputs | 16 individually controllable LED drive channels; each supports dot correction and open-circuit detection |
| MODE (26) | Shift Register Select | Low = ON/OFF register (16-bit); High = Dot Correction register (112-bit) |
| LE (31) | Latch Enable | Rising edge transfers serial data from shift register to output latches; triggers LOD sampling |
| FAULT (25) | Fault Flag Output | Open-drain output pulled low on LOD or TSD; supports wired-OR fault aggregation |
| O¯ ¯E¯ (30) | Output Enable | Active-low global disable; PWM-capable for brightness control across all channels |
| PE (23) | Pull-up Enable | Connect to VLED to enable active pull-ups (2.8 mA typical); connect to PGND to disable |
| REXT (27) | Reference Current Terminal | External resistor sets max channel current: IO(max) = 38.4 × VEXT/REXT; VEXT = 1.23 V (typ) |
Key Features
| Feature | Design Value |
|---|---|
| 7-bit Dot Correction | Per-channel LED intensity adjustment in 128 steps (0–100% of IO(max)) to compensate for LED binning variations |
| Open LED Detection (LOD) | Real-time per-channel open-circuit monitoring with fault reporting via FAULT pin and serial SDO output |
| Staggered Output Timing | Fixed 20 ns delay between consecutive OUTx transitions reduces simultaneous switching noise and ground bounce |
| Active Pull-up Enable | Configurable per-application via PE pin; eliminates ghosting in multiplexed LED displays |
| Thermal Shutdown with Hysteresis | Auto-recovery at 150 °C after 15 °C cooldown; preserves latch data during fault event |
Applications
| Display Backlighting | Full-Color LED Signage |
|---|---|
Use Scenario: Driving uniform white LED arrays behind LCD panels in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Constant-current sink driver with dot correction for luminance uniformity and LOD for system-level reliability monitoring. Use Value: Eliminates visible brightness gradients across backlight zones using per-channel 7-bit DC; FAULT pin enables early failure detection before panel degradation. | Use Scenario: Controlling RGB pixel modules in outdoor advertising billboards requiring high brightness and long-term reliability. IC Role / Device Role / Timing Role: 16-channel latched driver supporting cascaded configuration for scalable pixel density; MODE pin toggles between color intensity (DC) and frame update (ON/OFF) modes. Use Value: Enables precise color balance across thousands of pixels via 112-bit DC packet; LOD detection prevents dead-pixel clusters from propagating unnoticed. |
| Monochrome LED Signboards | Multicolor LED Lighting |
Use Scenario: Driving high-brightness red/amber LED matrices in traffic signal controllers and public information displays. IC Role / Device Role / Timing Role: High-current (80 mA) sink driver with O¯ ¯E¯-based PWM dimming and thermal shutdown for continuous outdoor operation. Use Value: Maintains consistent LED output under ambient temperature swings (–40 to +85 °C); TSD protection prevents thermal runaway during extended duty cycles. | Use Scenario: Architectural accent lighting with tunable white or dynamic color mixing using discrete LED strings. IC Role / Device Role / Timing Role: Latched constant-current driver enabling synchronized channel updates across multiple A6285EETTR-T devices via SDO/SDI daisy chain. Use Value: Supports smooth color transitions by decoupling intensity (DC mode) and timing (ON/OFF mode); 30 MHz interface ensures flicker-free updates at >1 kHz refresh rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59283DBQR | 16-channel, 45 mA max per channel; no dot correction; only basic ON/OFF control | Lacks per-channel intensity tuning; suitable for monochrome indicators but not color-critical displays | Select when cost sensitivity outweighs need for luminance uniformity or LOD diagnostics |
| MAX7219CWG+ | 8-digit/64-segment LED driver with built-in BCD decode; 40 mA per segment; no LOD or DC | Integrated display controller architecture; targets 7-segment numeric displays, not general-purpose LED arrays | Choose for legacy numeric HMI designs where segment mapping and scan control are primary requirements |
Compared with TLC59283DBQR and MAX7219CWG+, the A6285EETTR-T uniquely combines 7-bit dot correction, open LED detection, and 80 mA drive capability in a single 32-pin QFN package-enabling high-reliability, color-accurate LED systems without external calibration circuitry or fault monitoring ICs.
Availability
A6285EETTR-T is available at Aetrix Electronics and suitable for display backlighting, full-color LED signage, and monochrome signboard applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for A6285EETTR-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensors and power ICs, headquartered in Worcester, Massachusetts.
The A6285 product line delivers high-channel-count, feature-rich LED drivers optimized for commercial and industrial signage, backlighting, and architectural lighting where reliability, diagnostic capability, and luminance precision are critical.
FAQ
What is the maximum output current per channel for the A6285EETTR-T?
The A6285EETTR-T delivers up to 80 mA per channel when REXT = 600 Ω, with typical VEXT = 1.23 V and current gain of 38.4×. At REXT = 1.2 kΩ, maximum current drops to 40 mA. Output matching error remains within ±4.4% across all 16 channels under these conditions.
How does the A6285EETTR-T implement dot correction?
The A6285EETTR-T uses a dedicated 112-bit dot correction shift register (16 channels × 7 bits) to set individual LED current from 0% to 100% of IO(max). Dot correction data is loaded when MODE = High and LE rises, and applied independently of ON/OFF states. Each channel's DC value scales its output linearly per Equation 2 in the datasheet.
Can the A6285EETTR-T detect open LEDs, and how is the fault reported?
Yes, the A6285EETTR-T performs per-channel open LED detection (LOD) by sampling OUTx voltage < 0.4 V after turn-on. Fault status is signaled simultaneously via open-drain FAULT pin (pulled low) and serially shifted out on SDO during the next LE cycle. LOD detection requires O¯ ¯E¯ = Low and MODE = Low for full status readout.
What is the purpose of the PE pin on the A6285EETTR-T?
PE (Pull-up Enable) configures active pull-ups on all 16 outputs: tie PE to VLED to enable (2.8 mA typical), or to PGND to disable. This feature suppresses ghosting in multiplexed LED displays by ensuring rapid OFF-state voltage decay, especially critical in high-refresh-rate signage applications.
Does the A6285EETTR-T support cascading with other devices?
Yes, the A6285EETTR-T supports daisy-chain cascading via SDO-to-SDI connection. Each device shifts its serial data out on SDO after LE pulse, allowing a single controller to manage dozens of 16-channel drivers. Clock frequency must scale with cascade depth: fCLK ≥ 112 × fUPDATE × n for DC mode, or 16 × fUPDATE × n for ON/OFF mode.
A6285EETTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 12V
- Current - Output / Channel:
- 80mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
A6285EETTR-T FAQ
1.How can I place an order for A6285EETTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6285EETTR-T 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 A6285EETTR-T reliable?
The price and inventory of A6285EETTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6285EETTR-T is usually 5 days.
3.What payment methods are accepted for A6285EETTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6285EETTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6285EETTR-T?
A6285EETTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6285EETTR-T 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 A6285EETTR-T?
For technical support, including A6285EETTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6285EETTR-T requirements.
6.How does Aetrix verify that A6285EETTR-T is sourced from the original manufacturer or authorized distributors?
All A6285EETTR-T 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 A6285EETTR-T meets industry standards.
7.What is the process for return or replacement of A6285EETTR-T?
All A6285EETTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6285EETTR-T, 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 A6285EETTR-T part is unused and in its original packaging.
Return procedure for A6285EETTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6285EETTR-T Tags
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