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Analog Devices Inc. LTC6820HMS#PBF
- Part No.:
- LTC6820HMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6820HMS#PBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:327
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Product details
Overview
LTC6820HMS#PBF from Analog Devices is an isoSPI™ isolated bidirectional communications interface IC that enables robust SPI signal transmission 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 features ultralow 2µA idle current, automatic wake-up detection, and AEC-Q100 qualification for automotive battery monitoring systems.
For engineers reviewing the LTC6820HMS#PBF datasheet, LTC6820HMS#PBF pinout, LTC6820HMS#PBF application, or LTC6820HMS#PBF equivalent, key selection criteria include its 16-pin MSOP package with –40°C to 125°C operating range, configurable noise immunity via external bias resistors, transformer-based isolation compatibility, and seamless integration into existing SPI systems without software modification.
Technical Context
The LTC6820HMS#PBF implements a current-mode differential transmitter with matched source/sink drive (20× IBIAS gain) and precision window comparators in the receiver, where threshold voltage (VTCMP) is set to 0.5 × VICMP. 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 components and enabling reliable operation in high-noise environments.
Operation is configured via hardware pins: MSTR selects master/slave role; SLOW enables timing relaxation for ≤200kHz clocks; PHA/POL support all four SPI modes; and IBIAS/ICMP resistor divider sets both drive current (IB = VBIAS/RBIAS) and receiver sensitivity (VTCMP = 0.5 × VICMP), allowing system-level optimization of power vs. noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1Mbps maximum; enables real-time telemetry in battery management systems with sub-1µs timing margins. |
| Cable Length | Up to 100 meters with CAT-5 twisted pair; supports distributed sensor networks without repeaters. |
| Idle Current | 2µA typical at VDD = 5V, MSTR = 0; extends battery life in always-on remote monitoring nodes. |
| Operating Temp | –40°C to 125°C; qualified for under-hood automotive applications per AEC-Q100 Grade H. |
| Supply Range | VDD: 2.7V–5.5V; VDDS: 1.7V–5.5V; allows level-shifting between 1.8V/3.3V/5V logic domains. |
| Isolation Method | Transformer-coupled differential signaling; achieves >500V RMS isolation with standard pulse transformers. |
| Wake-Up Latency | 8µs max from signal detection to SPI output activation; ensures responsive control loop recovery. |
Pinout & Package
Package: 16-Lead Plastic MSOP (3.0mm × 4.9mm), exposed pad optional, MSL Level 1, –40°C to 125°C junction temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Active-high override for IDLE mode; forces continuous READY state when asserted. |
| MOSI / MISO | SPI Data I/O | Open-drain outputs requiring external VDDS pull-ups; direction determined by MSTR state. |
| SCK / CS | SPI Clock & Chip Select | Push-pull outputs on slave side; inputs on master side; voltage thresholds referenced to VDDS. |
| IP / IM | Isolated Interface Differential Pair | Current-driven differential terminals; transmit/receive isoSPI pulses across transformer barrier. |
| IBIAS / ICMP | Bias & Threshold Control | Resistor-divider network sets drive current (IB) and receiver comparator threshold (VTCMP = 0.5 × VICMP). |
| MSTR | Master/Slave Selector | High = master (drives SCK/CS); low = slave (receives SCK/CS, drives MISO). |
| SLOW | Timing Relaxation Enable | High = extended timing margins for ≤200kHz clocks or marginal slave devices. |
| VDD / VDDS | Power Supplies | VDD powers core logic; VDDS powers SPI I/O and defines input thresholds-enables level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-Based Isolation | Eliminates need for expensive digital isolators or optocouplers; uses low-cost 1:1 pulse transformers with no center tap required. |
| Configurable Noise Immunity | Adjustable drive current (0.1–1mA IBIAS → 2–20mA IP/IM) and comparator threshold (0.2–1.5V ICMP) optimize SNR for specific cable length and EMI environment. |
| No Software Changes Required | Transparent SPI-to-isoSPI translation preserves existing firmware; compatible with standard SPI controllers and slaves without driver updates. |
| Automatic Wake-Up Detection | Detects differential wake pulses ≥240mV with 240ns dwell time; resumes full SPI operation within 8µs-critical for low-power BMS sleep/wake cycles. |
| AEC-Q100 Qualified | Qualified to Grade H (–40°C to 125°C) with automotive reliability testing; suitable for ISO 26262 ASIL-B compliant battery monitoring architectures. |
Applications
| Battery Management Systems | Industrial Sensor Networks |
|---|---|
Use Scenario: Monitoring cell voltages and temperatures in high-voltage EV battery packs with distributed LTC68xx monitor ICs. IC Role / Device Role / Timing Role: LTC6820HMS#PBF acts as isolated SPI bridge between MCU host and remote LTC681x slave monitors over 10–50m twisted-pair harnesses. Use Value: Enables safe, noise-immune communication across >1kV potential differences while maintaining 1Mbps telemetry bandwidth and <10µs round-trip latency. | Use Scenario: Connecting programmable logic controllers (PLCs) to distributed analog input modules in factory automation cabinets. IC Role / Device Role / Timing Role: LTC6820HMS#PBF provides galvanic isolation between controller backplane and field-side I/O modules using standard Ethernet cabling. Use Value: Prevents ground-loop interference and common-mode transients from corrupting 16-bit ADC readings, with no impact on existing Modbus SPI firmware stacks. |
| Automotive Diagnostics | Energy Storage Systems |
Use Scenario: Isolating UDS/OBD-II diagnostic interfaces in vehicle ECUs to meet EMC Class 4 requirements. IC Role / Device Role / Timing Role: LTC6820HMS#PBF sits between diagnostic tool SPI and vehicle CAN gateway, converting commands to isolated pulses over shielded twisted pair. Use Value: Achieves >60dB common-mode rejection at 100MHz while supporting fast diagnostic read/write sequences without protocol translation overhead. | Use Scenario: Interfacing energy management controllers with remote battery string monitors in utility-scale ESS racks spanning multiple cabinets. IC Role / Device Role / Timing Role: LTC6820HMS#PBF serves as daisy-chain isolator between central controller and up to 8 LTC6813 slave ICs per string, each 5–15m apart. Use Value: Reduces wiring complexity and cost versus fiber or capacitive isolators, while supporting hot-swap reconfiguration and fault containment per string. |
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); requires external SPI controller logic; 25Mbps max but no built-in protocol translation. | Used where discrete isolation of SCK/MOSI/MISO/CS signals is preferred over integrated isoSPI packetization. | Select ADuM3401CRWZ when system already implements SPI framing in FPGA/microcontroller and only physical layer isolation is needed. |
| SI8641ED-B-IS | 4-channel capacitive isolator; 150Mbps data rate; no integrated bias/threshold configuration; fixed 3.3V/5V I/O. | Suitable for high-speed non-automotive industrial links where transformer-free PCB layout is prioritized over cable drive capability. | Choose SI8641ED-B-IS for compact PCB designs with short trace isolation (<30cm), avoiding transformer placement and EMI filtering complexity. |
Compared with ADuM3401CRWZ and SI8641ED-B-IS, the LTC6820HMS#PBF uniquely integrates isoSPI protocol translation, transformer-coupled cable driving, and field-configurable noise immunity-reducing BOM count, PCB area, and firmware development effort in battery monitoring and distributed sensing systems.
Availability
LTC6820HMS#PBF is available at Aetrix Electronics and suitable for battery management systems, automotive diagnostics, industrial sensor networks, and energy storage systems requiring stable component supply with guaranteed automotive-grade temperature performance.
Supply support for LTC6820HMS#PBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC6820HMS#PBF belongs to Analog Devices' isoSPI product line, engineered specifically for high-reliability, transformer-isolated serial communication in electric vehicle battery monitoring and harsh industrial environments.
FAQ
What is the maximum supported cable length for LTC6820HMS#PBF at 1Mbps?
The LTC6820HMS#PBF supports up to 100 meters of CAT-5 twisted-pair cable at 1Mbps, as validated in Analog Devices' datasheet Figure TA01b. Performance beyond 100m requires derating based on measured cable propagation delay; for example, adding 10m increases round-trip delay by ~50ns, which must be subtracted from setup/hold timing margins. The LTC6820HMS#PBF's SLOW pin can be used to relax timing for longer runs or lower-quality cabling.
Does LTC6820HMS#PBF require a center-tapped transformer?
No, the LTC6820HMS#PBF does not require a center-tapped transformer. Its matched source/sink current drivers eliminate the need for a center tap, reducing component count and cost. Standard 1:1 pulse transformers with 100Ω characteristic impedance-such as Pulse Electronics PA0188NL or Wurth 750313802-are fully compatible with the LTC6820HMS#PBF when terminated with 100Ω resistors at both ends.
How does the LTC6820HMS#PBF achieve AEC-Q100 qualification?
The LTC6820HMS#PBF achieves AEC-Q100 qualification through rigorous stress testing-including HTOL (high-temperature operating life), TC (temperature cycling), and ESD (HBM ±2kV)-per Automotive Grade H specifications (–40°C to 125°C). This qualification applies specifically to the LTC6820HMS#PBF variant, not the industrial-grade LTC6820IUD or LTC6820IMS variants. The LTC6820HMS#PBF is manufactured under controlled automotive processes and documented in Analog Devices' Automotive Reliability Reports.
Can LTC6820HMS#PBF operate with 1.8V SPI logic levels?
Yes, the LTC6820HMS#PBF supports 1.8V SPI logic levels via its independent VDDS supply pin. When VDDS = 1.8V, the input thresholds for CS, SCK, MOSI, and MISO are scaled to 0.2 × VDDS (low) and 0.8 × VDDS (high), ensuring reliable interfacing with 1.8V microcontrollers. The LTC6820HMS#PBF's open-drain MOSI/MISO outputs require external pull-ups to VDDS, and its push-pull SCK/CS outputs swing rail-to-rail relative to VDDS.
What is the function of the SLOW pin on LTC6820HMS#PBF?
When the SLOW pin on the LTC6820HMS#PBF is tied high, it extends internal timing margins-including t12, t14, and t16-to accommodate clock frequencies ≤200kHz or slave devices with marginal timing compliance. This prevents setup/hold violations in noisy environments or with long cables. When SLOW = low, the LTC6820HMS#PBF operates at full speed (1Mbps) with tighter timing windows. The SLOW pin has no effect on idle current or wake-up latency.
LTC6820HMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- isoSPI
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC6820HMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820HMS#PBF 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#PBF reliable?
The price and inventory of LTC6820HMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820HMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC6820HMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820HMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6820HMS#PBF?
LTC6820HMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820HMS#PBF 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#PBF?
For technical support, including LTC6820HMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820HMS#PBF requirements.
6.How does Aetrix verify that LTC6820HMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6820HMS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC6820HMS#PBF?
All LTC6820HMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820HMS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC6820HMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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