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Analog Devices Inc. LTC6820HMS#TRPBF
- Part No.:
- LTC6820HMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6820HMS#TRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,873
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Product details
Overview
LTC6820HMS#TRPBF from Analog Devices is an isoSPI™ isolated bidirectional communications interface IC that bridges SPI signals across galvanic isolation barriers via a single twisted-pair cable. It operates from 2.7V to 5.5V, supports 1Mbps data rates over up to 100m CAT-5 cable, and delivers ultralow 2µA idle current. It is used in automotive battery monitoring systems to isolate microcontroller SPI buses from high-voltage cell-sensing slave circuits.
For engineers reviewing the LTC6820HMS#TRPBF datasheet, LTC6820HMS#TRPBF pinout, LTC6820HMS#TRPBF application, or LTC6820HMS#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to 125°C), configurable noise immunity via IBIAS/ICMP resistor network, transformer-based isolation compatibility, and seamless integration into existing SPI firmware without software changes.
Technical Context
The LTC6820HMS#TRPBF implements a current-mode differential transmitter with matched 20× current gain (IBIAS-driven) and precision window comparators for pulse detection. Its isoSPI protocol encodes CS, SCK, MOSI, and MISO events into symmetric ±VA pulse pairs-long pulses (150ns half-width) for chip-select transitions and short pulses (50ns half-width) for data bits.
It supports dual operating modes via PHA/POL pins (all four SPI modes), level-shifting via independent VDD/VDDS supplies (1.7V–5.5V I/O), and automatic wake-up from 2µA idle state within 8µs upon CS fall or IP/IM signal detection. The receiver common-mode bias is dynamically set by VDD and VICMP, enabling robust operation under varying cable loss conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1Mbps maximum-enables real-time cell voltage polling in 16-cell BMS stacks without timing bottlenecks. |
| Cable Length Support | Up to 100 meters with CAT-5-allows physical separation of MCU and battery pack in EV architectures. |
| Idle Current | 2µA typical-minimizes standby power draw in always-on battery monitoring systems. |
| Operating Temperature | –40°C to +125°C-meets AEC-Q100 Grade H requirements for under-hood automotive deployment. |
| Supply Range | VDD: 2.7V–5.5V; VDDS: 1.7V–5.5V-supports mixed-voltage SPI domains and low-power microcontrollers. |
| Isolation Method | Transformer-coupled differential signaling-eliminates need for center-tapped transformers and reduces EMI. |
| Wake-Up Latency | 8µs max from idle-ensures rapid response to fault-triggered SPI transactions in safety-critical BMS. |
Pinout & Package
Package: 16-Lead Plastic MSOP (3mm × 4.9mm), exposed pad optional, MSL Level 1, –40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MOSI (Pin 2) | SPI Master Out / Slave In Data | Open-drain output (slave side) or input (master side); requires external VDDS pull-up for logic high. |
| MISO (Pin 3) | SPI Master In / Slave Out Data | Open-drain output (master side) or input (slave side); enables bidirectional data flow over same wire pair. |
| SCK (Pin 4) | SPI Clock Input/Output | Push-pull output (slave side), input (master side); no pull-up needed; threshold referenced to VDDS. |
| CS (Pin 5) | SPI Chip Select Input/Output | Push-pull output (slave side), input (master side); long isoSPI pulses encode CS transitions. |
| VDDS (Pin 6) | SPI I/O Power Supply | Sets logic thresholds for CS/SCK/MOSI/MISO/EN; enables level shifting between 1.7V and 5.5V domains. |
| POL (Pin 7) | SPI Clock Polarity Control | Tied high/low to configure SCK idle state (low = Mode 0/1; high = Mode 2/3) per SPI standard. |
| PHA (Pin 8) | SPI Clock Phase Control | Tied high/low to select data latch edge (1st or 2nd) relative to SCK transition-fully supports all 4 SPI modes. |
| VDD (Pin 9) | Main Device Power Supply | Supplies internal circuitry; bypass capacitor ≥0.01µF required between VDD and GND. |
| IM (Pin 10) | Isolated Interface Minus | Differential output/input terminal; paired with IP to drive/receive transformer-coupled isoSPI pulses. |
| IP (Pin 11) | Isolated Interface Plus | Differential output/input terminal; current-regulated sink/source (20× IBIAS) enables amplitude tuning. |
| MSTR (Pin 12) | Master/Slave Configuration | Tied to VDD for master role (drives CS/SCK), GND for slave role (receives CS/SCK and drives MISO). |
| SLOW (Pin 13) | Timing Mode Selection | Tied to VDD for ≤200kHz operation or marginal timing margins; tied to GND for full 1MHz performance. |
| GND (Pin 14) | Device Ground Reference | Common return path for VDD, VDDS, and analog circuitry; must be low-impedance for noise immunity. |
| ICMP (Pin 15) | Comparator Threshold Set | Resistor divider node setting receiver threshold at 0.5× VICMP; adjusts noise immunity vs. sensitivity trade-off. |
| IBIAS (Pin 16) | Interface Bias Current Source | Sinks current to GND via RBIAS; sets both transmitter drive current (20× IB) and comparator reference. |
| EN (Pin 1) | Enable Override Input | Active-high; forces READY state regardless of CS/IP/IM activity-used for forced wake-up or debug control. |
Key Features
| Feature | Design Value |
|---|---|
| isoSPI™ Protocol Compliance | Standardized differential pulse encoding (short/long ±VA pairs) ensures interoperability with ADI stack monitors and other LTC6820 devices. |
| Transformer-Coupled Isolation | Eliminates center-tap requirement and reduces EMI by using matched source/sink currents on IP/IM-compatible with off-the-shelf 1:1 pulse transformers. |
| Configurable Noise Immunity | Independent adjustment of transmitter amplitude (via RBIAS) and receiver threshold (via ICMP) allows optimization for specific cable length and noise environment. |
| AEC-Q100 Grade H Qualification | Validated for automotive use across –40°C to +125°C junction temperature-supports functional safety requirements in ISO 26262 ASIL-B/C systems. |
| Zero-Firmware-Change Integration | Transparently replaces standard SPI bus segments-no driver modifications needed; preserves existing clock polarity, phase, and timing assumptions. |
| Ultralow-Power Idle Mode | 2µA quiescent current with automatic wake-up on CS activity or IP/IM signal detection-extends battery life in always-connected BMS nodes. |
Applications
| Battery Management Systems (BMS) | Industrial Sensor Networks |
|---|---|
|
Use Scenario: Isolating SPI communication between a central MCU and daisy-chained LTC681x battery monitor ICs in high-voltage EV traction packs. IC Role / Device Role / Timing Role: LTC6820HMS#TRPBF acts as the isolated SPI bridge-converting MCU's native SPI signals into transformer-coupled isoSPI pulses for transmission across >500V potential differences. Use Value: Enables safe, noise-immune command/response exchange (e.g., cell voltage reads, balancing commands) without optocouplers or custom isolation ICs. |
Use Scenario: Connecting remote temperature/pressure sensors in hazardous industrial zones to a central PLC via long twisted-pair runs. IC Role / Device Role / Timing Role: LTC6820HMS#TRPBF serves as the isolated SPI-to-wire interface on both ends-translating PLC SPI commands into robust differential pulses for cable transmission. Use Value: Provides 100m reach and high EMI immunity in electrically noisy factory environments where RS-485 or CAN would require additional transceivers and protocol stacks. |
| Automotive Diagnostic Interfaces | Redundant Control Systems |
|
Use Scenario: Adding isolated diagnostic access to vehicle ECUs through OBD-II port without compromising main CAN bus integrity. IC Role / Device Role / Timing Role: LTC6820HMS#TRPBF interfaces a diagnostic tool's SPI host to an ECU's internal SPI peripherals-maintaining galvanic separation during flash programming or calibration. Use Value: Eliminates ground-loop risks and prevents fault propagation from test equipment to safety-critical vehicle networks. |
Use Scenario: Implementing dual-channel isolated SPI paths between redundant flight controllers and actuator drivers in UAVs or avionics. IC Role / Device Role / Timing Role: LTC6820HMS#TRPBF provides independent, synchronized isoSPI links-one for primary control, one for backup-each with deterministic <8µs wake latency. Use Value: Supports fail-operational architecture by enabling hot-swappable channel switching without SPI reinitialization delays. |
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; no built-in isoSPI protocol engine or pulse timing logic. | Requires external SPI controller + timing logic to emulate isoSPI behavior; higher BOM count and PCB area. | Select when multi-channel general-purpose isolation is needed alongside SPI, not when drop-in isoSPI replacement is required. |
| LTC6820IMS#TRPBF | Same die, identical electrical specs, but rated for –40°C to +85°C industrial temperature range (not AEC-Q100 qualified). | Approved for non-automotive industrial BMS, energy storage, or test equipment-not for under-hood automotive deployment. | Select for cost-sensitive industrial designs where extended temperature grade is unnecessary. |
Compared with ADuM3401CRWZ, LTC6820HMS#TRPBF integrates isoSPI protocol handling and eliminates external logic; compared with LTC6820IMS#TRPBF, it adds automotive qualification and guaranteed 125°C operation-critical for engine bay or battery pack proximity.
Availability
LTC6820HMS#TRPBF is available at Aetrix Electronics and suitable for battery management systems, automotive diagnostic interfaces, and industrial sensor networks requiring stable component supply, AEC-Q100 compliance, and long-cable isoSPI connectivity.
Supply support for LTC6820HMS#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LTC6820HMS#TRPBF belongs to Analog Devices' isoSPI™ interface product line, engineered specifically to replace optocouplers and discrete isolation solutions in high-noise, high-reliability SPI applications-especially battery monitoring and functional safety architectures.
FAQ
What is the maximum supported cable length for LTC6820HMS#TRPBF at 1Mbps?
The LTC6820HMS#TRPBF supports up to 100 meters of CAT-5 cable at 1Mbps under typical conditions. Performance depends on cable quality, termination (120Ω recommended), and transformer characteristics. For longer runs or noisy environments, reducing data rate or adjusting IBIAS/ICMP values improves margin-verified in Analog Devices' TPC 1 and Figure 1b of the datasheet.
Does LTC6820HMS#TRPBF require external components for basic operation?
Yes, LTC6820HMS#TRPBF requires external components: a resistor divider (RBIAS = RB1 + RB2) between IBIAS and GND to set drive current and receiver threshold; 0.01µF bypass capacitors on VDD and VDDS; and a 1:1 pulse transformer with 120Ω termination on each side. No external logic or timing circuitry is needed-the isoSPI protocol is fully integrated.
How does LTC6820HMS#TRPBF achieve AEC-Q100 qualification?
LTC6820HMS#TRPBF achieves AEC-Q100 qualification through controlled manufacturing, extended temperature testing (–40°C to +125°C), and stress validation including HTOL, TC, UHAST, and ESD. It is designated "H" grade and marked with #3ZZ suffix variants for full automotive reliability reporting-LTC6820HMS#TRPBF itself meets Grade H specifications per datasheet Rev C.
Can LTC6820HMS#TRPBF interface with non-Analog Devices SPI slaves?
Yes, LTC6820HMS#TRPBF is protocol-agnostic toward SPI slaves. It reconstructs standard SPI waveforms (CS, SCK, MOSI, MISO) on the isolated side-compatible with any SPI device, including Microchip, STMicroelectronics, or Texas Instruments ICs. Timing compliance is ensured via adjustable SLOW mode and PHA/POL configuration.
What is the function of the EN pin on LTC6820HMS#TRPBF?
The EN pin on LTC6820HMS#TRPBF is an active-high enable override. When held high, it forces the device into READY/ACTIVE state regardless of CS or IP/IM activity-preventing automatic entry into 2µA IDLE mode. This is used for debug, forced wake-up, or synchronization in multi-device systems where coordinated activation is required.
LTC6820HMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- isoSPI
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Isolated Communications Interface
- Interface:
- SPI
- Voltage - Supply:
- 2.7V ~ 5.5V
- Supplier Device Package:
- 16-MSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC6820HMS#TRPBF FAQ
1.How can I place an order for LTC6820HMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820HMS#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 LTC6820HMS#TRPBF reliable?
The price and inventory of LTC6820HMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820HMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6820HMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820HMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6820HMS#TRPBF?
LTC6820HMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820HMS#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 LTC6820HMS#TRPBF?
For technical support, including LTC6820HMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820HMS#TRPBF requirements.
6.How does Aetrix verify that LTC6820HMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6820HMS#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 LTC6820HMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6820HMS#TRPBF?
All LTC6820HMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820HMS#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 LTC6820HMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC6820HMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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