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Analog Devices Inc. LTC6820IUD#TRPBF
- Part No.:
- LTC6820IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC6820IUD#TRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
LTC6820IUD#TRPBF from Analog Devices is an isoSPI™ isolated bidirectional SPI communications interface IC that enables galvanic isolation between microcontroller and slave devices over a single twisted-pair cable. It supports 1Mbps data rate, operates from –40°C to 85°C, delivers ultralow 2µA idle current, and interfaces with logic levels from 1.7V to 5.5V - enabling robust battery monitoring systems in electric vehicle battery packs.
For engineers reviewing the LTC6820IUD#TRPBF datasheet, LTC6820IUD#TRPBF pinout, LTC6820IUD#TRPBF application, or LTC6820IUD#TRPBF equivalent, key selection criteria include its differential pulse-based isolation architecture, configurable biasing via external resistor divider, support for up to 100m CAT-5 cable, AEC-Q100 qualification (I-grade), and compatibility with ISO26262-compliant functional safety designs.
Technical Context
The LTC6820IUD#TRPBF implements a transformer-coupled, current-driven isoSPI interface using matched source/sink drivers on IP/IM pins and precision window comparators on the receiver side. Its transmitter generates symmetric ±VA pulse pairs (short for data, long for CS control), with timing parameters including t½PW(D) = 40–60ns and tDEL(D) = 75–120ns.
Receiver threshold voltage VTCMP is set by external resistor divider on IBIAS/ICMP pins (VICMP = 0.2–1.5V → VTCMP = 0.4–0.6V), and drive current gain AIB is fixed at 18–24 mA/mA. The device supports dual supply domains: VDD (2.7–5.5V) for core logic and VDDS (1.7–5.5V) for level-shifted SPI I/O, enabling interoperability across mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1 Mbps maximum - supports high-speed communication over 100 m of twisted-pair cable with minimal timing margin loss. |
| Idle Current | 2 µA typical - enables ultra-low-power operation during system sleep, critical for always-on battery monitoring nodes. |
| Operating Temp | –40°C to +85°C - industrial-grade temperature range suitable for under-hood and battery-pack environments. |
| Supply Range | VDD: 2.7–5.5 V; VDDS: 1.7–5.5 V - allows independent level-shifting of SPI I/O to match host MCU or slave peripheral voltages. |
| Isolation Method | Transformer-based galvanic isolation - requires only standard pulse transformers (no center tap), reducing EMI and BOM cost. |
| Wake-Up Latency | 8 µs max - ensures rapid response to incoming CS transitions or IP/IM activity, minimizing communication latency in real-time systems. |
| Cable Length | Up to 100 meters - validated with CAT-5 cable, enabling distributed sensor architectures across large battery modules or industrial networks. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD package), exposed pad (Pin 17) optional GND connection. Thermal resistance θJA = 58.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MOSI (Pin 1) | SPI Master Out / Slave In Data | Open-drain output (slave) or input (master); requires external pull-up to VDDS for proper logic level translation. |
| MISO (Pin 2) | SPI Master In / Slave Out Data | Open-drain output (master) or input (slave); pull-up required; carries reconstructed slave response data back across isolation barrier. |
| SCK (Pin 3) | SPI Clock Input/Output | Push-pull output (slave) or input (master); no pull-up needed; clock edges drive isoSPI pulse generation and sampling. |
| CS (Pin 4) | SPI Chip Select Input/Output | Push-pull output (slave) or input (master); falling/rising edges trigger long ±1 isoSPI pulses for session control. |
| VDDS (Pin 5) | SPI I/O Power Supply | Defines logic thresholds for SCK, CS, MOSI, MISO, EN; enables level shifting between core (VDD) and interface domains. |
| POL/PHA (Pins 6–7) | SPI Mode Configuration | Set static logic levels to select one of four SPI modes (CPOL/CPHA combinations); no runtime reconfiguration. |
| VDD (Pin 8) | Core Device Supply | Power for internal logic, bias circuits, and EN/MSTR/SLOW inputs; bypass capacitor ≥0.01 µF required. |
| IM/IP (Pins 9–10) | Differential Isolated Interface | Current-mode differential pair; transmits/receives isoSPI pulses; terminated with 120Ω across isolation barrier. |
| MSTR (Pin 11) | Master/Slave Selector | Tie to VDD for master (MCU side), GND for slave (peripheral side); configures direction of CS/SCK/MOSI/MISO signal flow. |
| SLOW (Pin 12) | Timing Mode Control | Tie to GND for >200 kHz operation; tie to VDD for ≤200 kHz or marginal timing margins - adjusts internal pulse timers. |
| GND (Pin 13) | Device Ground Reference | Common return for VDD, VDDS, and analog bias circuitry; must be low-impedance for noise immunity. |
| ICMP (Pin 14) | Comparator Threshold Set | Input to internal 0.5× gain amplifier; sets VTCMP = 0.5 × VICMP; connected to resistor divider from IBIAS to GND. |
| IBIAS (Pin 15) | Bias Current Reference | Sinks 0.1–1 mA (RBIAS = 2k–20kΩ); sets IP/IM drive current IDRV = 20 × IB; voltage regulated to ~2.0 V. |
| EN (Pin 16) | Enable Override | Active-high; forces READY state regardless of CS/idle timeout; used for forced wake-up or debug mode. |
Key Features
| Feature | Design Value |
|---|---|
| isoSPI™ Pulse Encoding | Generates symmetric ±VA pulse pairs (short for data, long for CS) eliminating DC component and improving transformer coupling efficiency. |
| Configurable Noise Immunity | Adjustable VTCMP (0.4–0.6 V) and IDRV (2–20 mA) via external RBIAS/ICMP divider - optimizes SNR for specific cable length and EMI environment. |
| Ultralow Idle Power | 2 µA typical quiescent current with automatic 4–7.5 ms idle timeout - extends battery life in remote sensor nodes without firmware intervention. |
| Transformer-Coupled Isolation | Eliminates need for center-tapped transformers; reduces component count, cost, and board area while maintaining >500 V RMS isolation capability. |
| AEC-Q100 Qualified | Qualified per AEC-Q100 Rev H Grade 3 (–40°C to +85°C) - meets automotive reliability requirements for battery management and chassis electronics. |
| ISO26262 Support | Engineered for ASIL-B compliant systems; includes built-in diagnostics (wake detection, idle timeout, bias monitoring) and failure mode documentation. |
Applications
| Battery Monitoring Systems | Industrial Networking |
|---|---|
|
Use Scenario: Real-time cell voltage and temperature acquisition in EV traction battery packs with centralized MCU and distributed LTC68xx monitor ICs. IC Role / Device Role / Timing Role: LTC6820IUD#TRPBF acts as isolated SPI bridge between MCU and daisy-chained battery monitors, transmitting CS/SCK/MOSI and returning MISO over 10+ meter twisted-pair runs. Use Value: Enables safe, high-fidelity communication across >1 kV potential differences between battery modules and controller, meeting ASIL-D system-level requirements. |
Use Scenario: Connecting programmable logic controllers (PLCs) to remote I/O modules in factory automation over extended cable distances. IC Role / Device Role / Timing Role: LTC6820IUD#TRPBF provides isolated SPI extension from PLC mainboard to field-mounted analog/digital I/O cards, replacing RS-485 or CAN where higher bandwidth is needed. Use Value: Delivers 1 Mbps deterministic latency (<1 µs jitter) over 100 m - outperforming legacy fieldbus protocols while retaining transformer-based isolation simplicity. |
| Remote Sensors | Automotive Chassis Electronics |
|
Use Scenario: Environmental sensing nodes (temperature, humidity, vibration) deployed in harsh, high-noise locations such as wind turbine nacelles or oil/gas pipelines. IC Role / Device Role / Timing Role: LTC6820IUD#TRPBF isolates low-power microcontrollers from noisy sensor front-ends and long cable runs, supporting wake-on-event operation. Use Value: 2 µA idle current + 240 mV differential wake threshold enables years of operation on primary batteries, even with infrequent data transmission. |
Use Scenario: Communication between ADAS domain controller and radar/LiDAR sensor units mounted near vehicle periphery. IC Role / Device Role / Timing Role: LTC6820IUD#TRPBF serves as isolated configuration and diagnostic interface for radar MMICs, handling SPI register reads/writes across chassis ground loops. Use Value: AEC-Q100 qualification and ISO26262 design assurance ensure functional safety compliance without requiring additional system-level redundancy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated SPI interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADuM3401CRWZ | Quad-channel digital isolator (non-SPI-specific); uses iCoupler® capacitive isolation; 50 Mbps channel rate but requires external SPI protocol handling logic. | Requires external level shifters and SPI state machine; not drop-in; better suited for multi-signal isolation than dedicated SPI bridging. | Select when isolating multiple non-SPI signals (e.g., GPIO, UART, PWM) alongside SPI, or when >1 Mbps aggregate bandwidth is needed. |
| SI8641ED-B-IS | Quad-channel digital isolator (capacitive); 150 Mbps per channel; no native SPI encoding - relies on external controller to manage timing and framing. | Lacks isoSPI pulse generation/reconstruction; increases firmware complexity; no built-in wake-up or idle optimization. | Choose for general-purpose digital isolation where SPI protocol translation is handled in software or FPGA, and cost-per-channel is prioritized. |
Compared with ADuM3401CRWZ and SI8641ED-B-IS, the LTC6820IUD#TRPBF uniquely integrates full hardware-accelerated isoSPI protocol translation, transformer-friendly current-mode signaling, and ultra-low-power idle operation - reducing system-level design effort and power consumption in battery-critical or automotive applications.
Availability
LTC6820IUD#TRPBF is available at Aetrix Electronics and suitable for battery monitoring systems, industrial networking infrastructure, and automotive chassis electronics requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LTC6820IUD#TRPBF 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC6820IUD#TRPBF belongs to Analog Devices' isoSPI™ interface product line, engineered specifically to replace optocouplers and discrete isolator solutions in high-reliability, high-noise, and safety-critical SPI applications - especially in battery management and automotive subsystems.
FAQ
What is the maximum supported cable length for the LTC6820IUD#TRPBF?
The LTC6820IUD#TRPBF supports up to 100 meters of CAT-5 twisted-pair cable at 1 Mbps, as validated in the datasheet's typical application curves. Performance beyond 100 m depends on cable quality, termination, transformer characteristics, and noise environment - derating is recommended for longer runs or harsh EMI conditions. Cable delay directly impacts timing margins, particularly tDEL and tINV specifications.
Does the LTC6820IUD#TRPBF require a center-tapped transformer?
No, the LTC6820IUD#TRPBF does not require a center-tapped transformer. Its matched source/sink current drivers on IP and IM pins eliminate the need for a center tap, simplifying magnetics design and reducing cost. Standard 1:1 pulse transformers with 120Ω termination on each side are sufficient to achieve hundreds of volts of galvanic isolation.
How does the LTC6820IUD#TRPBF achieve ultralow idle current?
The LTC6820IUD#TRPBF achieves 2 µA typical idle current through hardware-enforced power gating: after 4–7.5 ms of inactivity (CS high for master, no IP/IM activity for slave), it disables internal bias circuits and driver stages. Wake-up occurs within 8 µs upon CS fall (master) or differential signal detection (slave), with no firmware involvement required.
Can the LTC6820IUD#TRPBF interface with 1.8V logic systems?
Yes, the LTC6820IUD#TRPBF supports 1.7V to 5.5V logic levels on its SPI I/O pins via the VDDS supply. When VDDS = 1.8V, VIH(SPI) = 0.8 × 1.8V = 1.44V and VOL = 0.2V, ensuring reliable interfacing with 1.8V microcontrollers and peripherals without level translators.
Is the LTC6820IUD#TRPBF pin-compatible with other grades in the LTC6820 family?
Yes, the LTC6820IUD#TRPBF shares identical pinout and footprint with all other 16-lead QFN variants (e.g., LTC6820HUD#TRPBF, LTC6820IMS#TRPBF). Differences are limited to temperature grade (I-grade: –40°C to +85°C), packaging (QFN vs MSOP), and ordering suffixes - enabling direct substitution where thermal and form-factor requirements align.
LTC6820IUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- isoSPI
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Isolated Communications Interface
- Interface:
- SPI
- Voltage - Supply:
- 2.7V ~ 5.5V
- Supplier Device Package:
- 16-QFN (3x3)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC6820IUD#TRPBF FAQ
1.How can I place an order for LTC6820IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820IUD#TRPBF 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 LTC6820IUD#TRPBF reliable?
The price and inventory of LTC6820IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6820IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6820IUD#TRPBF?
LTC6820IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820IUD#TRPBF 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 LTC6820IUD#TRPBF?
For technical support, including LTC6820IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820IUD#TRPBF requirements.
6.How does Aetrix verify that LTC6820IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6820IUD#TRPBF 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 LTC6820IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6820IUD#TRPBF?
All LTC6820IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820IUD#TRPBF, 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 LTC6820IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC6820IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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