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Analog Devices Inc. LTC6820HUD#TRPBF
- Part No.:
- LTC6820HUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC6820HUD#TRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,875
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Product details
Overview
LTC6820HUD#TRPBF from Analog Devices is an isoSPI isolated bidirectional communications interface IC that enables SPI signal transmission across galvanic isolation barriers via a single twisted-pair cable. It operates from 2.7V to 5.5V, supports up to 1Mbps data rate over 100m CAT-5 cable, and delivers ultralow 2µA idle current. It is used in battery monitoring systems where high noise immunity and AEC-Q100 qualification are required.
For engineers reviewing the LTC6820HUD#TRPBF datasheet, LTC6820HUD#TRPBF pinout, LTC6820HUD#TRPBF application, or LTC6820HUD#TRPBF equivalent, key selection criteria include its 16-lead 3mm × 3mm QFN package, –40°C to 125°C automotive-grade temperature range, configurable bias resistor network for signal amplitude/threshold tuning, and compatibility with standard pulse transformers without center-tap requirement.
Technical Context
The LTC6820HUD#TRPBF implements a current-mode differential transmitter with matched source/sink drive (20× IBIAS gain) and precision window comparators on the receiver side. Its isoSPI protocol encodes SPI events-CS transitions, SCK latching edges, and MOSI states-into symmetric ±VA pulse pairs (short for data, long for CS), eliminating DC component and enabling robust noise rejection.
It supports four SPI modes via PHA/POL configuration pins, features automatic wake-up detection (240mV differential threshold, 240ns dwell time), and integrates idle timeout (4–7.5ms) with sub-8µs wake latency. The IBIAS/ICMP resistor divider sets both drive current (0.1mA–1mA) and comparator threshold (0.2V–1.5V), allowing system-level optimization of power vs. noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 1Mbps - enables real-time cell voltage sampling in multi-cell battery packs without sacrificing isolation integrity. |
| Cable Length | Up to 100 meters - supports distributed battery monitoring across large EV chassis or energy storage racks. |
| Idle Current | 2µA maximum - extends standby life in always-on BMS nodes powered by auxiliary supplies. |
| Operating Temp | –40°C to 125°C - meets AEC-Q100 Grade H requirements for under-hood and traction battery applications. |
| Supply Range | VDD = 2.7V–5.5V, VDDS = 1.7V–5.5V - allows independent level-shifting between controller and slave logic domains. |
| Isolation Method | Transformer-coupled differential signaling - achieves hundreds of volts of galvanic isolation using low-cost 1:1 pulse transformers. |
| Wake-Up Threshold | 240mV differential, 240ns dwell - reliably detects valid pulses while rejecting EMI transients common in motor-drive environments. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD package), exposed pad (Pin 17) optional GND connection, MSL Level 1, rated for –40°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MOSI (Pin 1) | SPI Master Out/Slave In Data | Open-drain output when MSTR=0 (slave); input when MSTR=1 (master); requires external VDDS pull-up. |
| MISO (Pin 2) | SPI Master In/Slave Out Data | Open-drain output when MSTR=1 (master); input when MSTR=0 (slave); requires external VDDS pull-up. |
| SCK (Pin 3) | SPI Clock Input/Output | Push-pull output when MSTR=0; input when MSTR=1; no pull-up needed; max VDDS-referenced voltage. |
| CS (Pin 4) | SPI Chip Select Input/Output | Push-pull output when MSTR=0; input when MSTR=1; defines frame boundaries for isoSPI pulse encoding. |
| VDDS (Pin 5) | SPI I/O Power Supply | Sets logic thresholds for CS/SCK/MOSI/MISO/EN; enables level shifting between VDD and peripheral logic voltages. |
| POL/PHA (Pins 6–7) | SPI Mode Configuration | Set static logic levels to select one of four SPI clock polarity/phase modes (Mode 0–3) for full controller compatibility. |
| VDD (Pin 8) | Main Device Supply | Power for internal circuitry and bias generation; bypass capacitor ≥0.01µF required between VDD and GND. |
| IM/IP (Pins 9–10) | Isolated Interface Differential Pair | Transmit/receive differential signals across transformer; matched current drive eliminates center-tap requirement. |
| MSTR (Pin 11) | Master/Slave Selector | Tie to VDD for master-side interface (connects to MCU); tie to GND for slave-side (connects to BMS ADC or other SPI device). |
| SLOW (Pin 12) | Timing Mode Control | Tie to GND for >200kHz operation; tie to VDD for ≤200kHz or marginal timing margin - adjusts internal pulse timers. |
| GND (Pin 13) | Device Ground Reference | Common return for VDD, VDDS, and analog bias circuits; must be low-impedance for stable IBIAS regulation. |
| ICMP (Pin 14) | Comparator Threshold Set | Connected to resistor divider from IBIAS to GND; sets receiver threshold at 0.5× ICMP voltage (0.2V–1.5V range). |
| IBIAS (Pin 15) | Bias Current Reference | Sinks 20× IBIAS current on IP/IM; held at ~2V when enabled; resistor value (2k–20kΩ) sets drive strength and threshold. |
| EN (Pin 16) | Enable Override | Active-high; forces READY state regardless of CS/idle timeout; used for forced wake or debug mode. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-based galvanic isolation | Enables safe communication across >500V isolation barriers using low-cost 1:1 pulse transformers - no optocouplers or custom magnetics required. |
| Configurable amplitude & threshold | Single resistor divider (IBIAS→GND→ICMP) simultaneously sets drive current (0.1–1mA) and receiver sensitivity (0.2–1.5V), enabling trade-off between EMI robustness and power consumption. |
| Ultralow idle current | 2µA maximum (MSTR=0) or 1µA (MSTR=1) - minimizes quiescent drain in always-connected BMS nodes during vehicle sleep mode. |
| Automatic wake-up detection | Detects valid isoSPI pulses with 240mV differential amplitude and 240ns dwell time, then asserts ready state within 8µs - eliminates software polling overhead. |
| Four SPI mode support | Hardware-configurable PHA/POL pins enable seamless integration with any SPI master or slave, including legacy microcontrollers and ADI's own stack monitors. |
Applications
| Battery Management Systems | Industrial Sensor Networks |
|---|---|
Use Scenario: Monitoring individual cell voltages in 12–100S lithium-ion battery packs for electric vehicles and grid-scale storage. IC Role / Device Role / Timing Role: Isolates MCU SPI commands from high-voltage battery stack; transmits ADC readouts back across barrier using isoSPI pulses. Use Value: Enables accurate, noise-immune communication in high dv/dt environments where optical isolators fail due to CMTI limitations. | Use Scenario: Connecting remote temperature, pressure, or vibration sensors to a central PLC over long cable runs in factory automation. IC Role / Device Role / Timing Role: Converts local SPI sensor outputs into transformer-isolated differential pulses for transmission over 100m twisted pair. Use Value: Eliminates ground loops and common-mode noise in electrically noisy industrial settings while maintaining SPI timing fidelity. |
| Automotive Diagnostics Interfaces | Redundant Safety Controllers |
Use Scenario: Providing isolated diagnostic access to safety-critical ECUs (e.g., airbag controllers, brake modules) via service port. IC Role / Device Role / Timing Role: Bridges service tool SPI to ECU internal bus through reinforced isolation barrier compliant with ISO 26262 ASIL-D requirements. Use Value: Supports field diagnostics without compromising functional safety architecture or requiring redesign of existing ECU PCB layout. | Use Scenario: Synchronizing dual-lockstep MCUs in safety-critical applications such as steering or braking control units. IC Role / Device Role / Timing Role: Transfers status, command, and heartbeat signals between redundant processors across galvanic barrier with deterministic latency. Use Value: Provides fail-safe inter-processor communication path immune to conducted EMI and supply rail disturbances. |
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 with SPI-tolerant timing; uses iCoupler capacitive isolation; no integrated isoSPI protocol engine. | Requires external logic to encode/decode SPI signals into isolated channels; higher component count and PCB area. | Select when existing design uses discrete isolators and SPI framing is handled in firmware; not drop-in for LTC6820HUD#TRPBF. |
| SI8641ED-B-IS | Quad-channel 5kVrms reinforced digital isolator; supports up to 150Mbps; no native isoSPI mapping or bias configuration. | Needs external level shifters and pulse logic for SPI event translation; lacks automatic wake-up and idle current optimization. | Choose for high-speed general-purpose isolation where protocol-awareness is unnecessary and lowest propagation delay is critical. |
Compared with ADuM3401CRWZ and SI8641ED-B-IS, the LTC6820HUD#TRPBF uniquely integrates isoSPI protocol handling, transformer-friendly current-mode signaling, and ultra-low-power idle operation - reducing BOM count, simplifying layout, and enabling direct replacement of non-isolated SPI links in battery monitoring without firmware changes.
Availability
LTC6820HUD#TRPBF is available at Aetrix Electronics and suitable for battery management systems, automotive diagnostics interfaces, and industrial sensor networks requiring stable component supply with guaranteed automotive-grade temperature performance and long-term lifecycle support.
Supply support for LTC6820HUD#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 LTC6820HUD#TRPBF belongs to Analog Devices' isoSPI interface product line, engineered specifically for high-reliability, noise-immune communication in battery monitoring and functional safety systems where galvanic isolation and low power are mandatory.
FAQ
What is the primary function of the LTC6820HUD#TRPBF in a battery monitoring system?
The LTC6820HUD#TRPBF serves as an isolated SPI bridge between a microcontroller and high-voltage battery stack peripherals. It converts standard SPI signals (CS, SCK, MOSI, MISO) into transformer-coupled differential pulses for safe, noise-immune communication across galvanic barriers. In the LTC6820HUD#TRPBF, this enables precise cell voltage acquisition in automotive and energy storage BMS without compromising safety or timing integrity.
How does the LTC6820HUD#TRPBF achieve galvanic isolation without optical components?
The LTC6820HUD#TRPBF uses current-mode differential signaling across a standard 1:1 pulse transformer, eliminating the need for optocouplers or custom magnetics. Its matched source/sink drivers on IP/IM pins generate symmetric ±VA pulses, while precision window comparators on the receiver side detect differential thresholds set by the IBIAS/ICMP resistor network. This architecture achieves hundreds of volts of isolation with low EMI and no center-tap requirement - a core feature of the LTC6820HUD#TRPBF.
Can the LTC6820HUD#TRPBF operate with different SPI clock polarities and phases?
Yes, the LTC6820HUD#TRPBF supports all four standard SPI modes via hardware configuration pins PHA and POL. When POL = 0, SCK idles low; when POL = 1, SCK idles high. When PHA = 0, data is latched on the first clock edge; when PHA = 1, it is latched on the second edge. These pins are tied to VDD or GND at power-up to select Mode 0–3 - ensuring full interoperability with diverse SPI masters and slaves in the LTC6820HUD#TRPBF application space.
What is the significance of the SLOW pin on the LTC6820HUD#TRPBF?
The SLOW pin on the LTC6820HUD#TRPBF selects between two internal timing profiles: when tied to GND, it enables high-speed operation (>200kHz SCK) with tight pulse timing (e.g., 50ns half-pulse width); when tied to VDD, it relaxes timing margins for lower-frequency or electrically marginal links (≤200kHz), extending pulse widths to 0.9–1.4µs. This flexibility ensures reliable isoSPI communication across varying cable lengths, transformer characteristics, and noise conditions - a key design adaptation point in the LTC6820HUD#TRPBF.
Does the LTC6820HUD#TRPBF require external components for basic operation?
Yes, the LTC6820HUD#TRPBF requires three essential external components: a resistor divider (RB1 + RB2 = 2k–20kΩ) between IBIAS and GND to set drive current and receiver threshold; a 1:1 pulse transformer with center-tap unused; and 0.01µF bypass capacitors on VDD and VDDS. Optional components include pull-up resistors on MOSI/MISO (open-drain) and termination resistors (e.g., 100Ω) on the twisted-pair cable. These are fundamental to LTC6820HUD#TRPBF functionality - no internal biasing or isolation elements are integrated.
LTC6820HUD#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
LTC6820HUD#TRPBF FAQ
1.How can I place an order for LTC6820HUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820HUD#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 LTC6820HUD#TRPBF reliable?
The price and inventory of LTC6820HUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820HUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6820HUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820HUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6820HUD#TRPBF?
LTC6820HUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820HUD#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 LTC6820HUD#TRPBF?
For technical support, including LTC6820HUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820HUD#TRPBF requirements.
6.How does Aetrix verify that LTC6820HUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6820HUD#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 LTC6820HUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6820HUD#TRPBF?
All LTC6820HUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820HUD#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 LTC6820HUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC6820HUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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