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Analog Devices Inc. LTC6820HMS#3ZZTRPBF
- Part No.:
- LTC6820HMS#3ZZTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6820HMS#3ZZTRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,401
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Product details
Overview
LTC6820HMS#3ZZTRPBF from Analog Devices is an isoSPI™ isolated bidirectional communications interface IC that bridges SPI signals across galvanic isolation barriers using a single twisted-pair cable. It operates from 2.7V to 5.5V, supports 1Mbps data rate over up to 100m CAT-5 cable, and features ultralow 2µA idle current. It is AEC-Q100 qualified for automotive battery monitoring systems requiring high noise immunity and ISO 26262 compliance.
For engineers reviewing the LTC6820HMS#3ZZTRPBF datasheet, LTC6820HMS#3ZZTRPBF pinout, LTC6820HMS#3ZZTRPBF application, or LTC6820HMS#3ZZTRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing constraints, and validated alternative options for isolated SPI system design in harsh environments.
Technical Context
The LTC6820HMS#3ZZTRPBF implements a transformer-coupled isoSPI interface with differential current-mode transmission (IP/IM) and precision window-comparator-based reception. Its transmitter uses matched 20× current gain (IBIAS-driven), while the receiver applies configurable comparator thresholds via ICMP voltage scaling (0.2V–1.5V).
It supports master/slave configuration via MSTR pin, dual-speed operation (SLOW pin), and full SPI mode compatibility (POL/PHA pins). Timing is tightly specified for both master and slave roles-including tDEL(D) ≤ 120ns, tRTN ≤ 4ns (SLOW=0), and wake-up detection at VWAKE = 240mV with tDWELL = 240ns-enabling deterministic latency in safety-critical battery management stacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1Mbps maximum; enables fast polling of multi-cell BMS slaves without increasing SPI clock frequency on MCU side. |
| Cable Length Support | Up to 100 meters with CAT-5 cable; eliminates need for local microcontrollers near battery packs. |
| Idle Current | 1µA typical (MSTR = VDD); extends system standby life in always-on automotive monitoring applications. |
| Operating Temperature | –40°C to +125°C; qualified for under-hood and battery-pack mounting per AEC-Q100 Grade H. |
| Isolation Method | Transformer-based galvanic isolation; requires no optocouplers or capacitive isolators-reduces BOM count and EMI susceptibility. |
| Supply Range | VDD: 2.7V–5.5V; VDDS: 1.7V–5.5V; allows level-shifting between 1.8V/3.3V/5V logic domains without external translators. |
| Wake-Up Latency | tREADY ≤ 8µs after CS fall or IP/IM signal detection; ensures rapid response to host commands in fault-monitoring cycles. |
Pinout & Package
Package: 16-Lead Plastic MSOP (3.0mm × 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) or input (master); requires external VDDS pull-up; interfaces directly to MCU or slave device data line. |
| MISO (Pin 3) | SPI Master In / Slave Out Data | Open-drain output (master) or input (slave); carries return data from slave; timing-critical path with t11 ≤ 55ns setup to SCK. |
| SCK (Pin 4) | SPI Clock Input/Output | Push-pull output (slave) or input (master); referenced to VDDS; supports 0.5µs–5µs clock periods depending on SLOW setting. |
| CS (Pin 5) | SPI Chip Select Input/Output | Push-pull output (slave) or input (master); long ±1 pulses encode CS transitions; t5 ≤ 0.6µs (1MHz) ensures tight slave enable timing. |
| VDDS (Pin 6) | SPI I/O Power Supply | Sets logic thresholds for CS/SCK/MOSI/MISO/EN; decoupling ≥0.01µF required; enables level shifting independent of VDD. |
| POL/PHA (Pins 7/8) | SPI Mode Configuration | Static logic inputs (VDD/GND) selecting all four SPI modes; no runtime reconfiguration needed-hardwired for deterministic behavior. |
| VDD (Pin 9) | Main Device Power Supply | Supplies internal circuitry and bias generators; bypass capacitor ≥0.01µF mandatory; powers MSTR/SLOW/EN configuration logic. |
| IM/IP (Pins 10/11) | Isolated Interface Differential Pair | Current-mode transmitter/receiver pair; drives/reads differential pulses across transformer; matched impedance critical for 100m reach. |
| MSTR (Pin 12) | Master/Slave Selector | Defines directionality: high = master (drives CS/SCK), low = slave (receives CS/SCK); sets internal timing paths and pulse mapping. |
| SLOW (Pin 13) | Timing Mode Control | High = relaxed timing (t12 ≤ 1.4µs), low = fast mode (t12 ≤ 145ns); selects between 200kHz and 1MHz isoSPI operation. |
| GND (Pin 14) | Analog/Digital Ground Reference | Common return for VDD, VDDS, and internal bias circuits; must be low-impedance connection to minimize ground bounce in noisy environments. |
| ICMP (Pin 15) | Comparator Threshold Set | Input to set receiver window threshold (VTCMP = 0.5 × VICMP); tied to resistor divider from IBIAS; adjusts noise immunity vs. sensitivity. |
| IBIAS (Pin 16) | Interface Bias Current Source | 2V-regulated output; sinks current through RBIAS (2kΩ–20kΩ) to set drive current IDRV = 20 × IB; defines signal amplitude VA = IDRV × RM/2. |
| EN (Pin 1) | Enable Override Input | Active-high override of auto-idle; forces READY state regardless of CS/IP/IM inactivity; used for forced wake-up or debug hold. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-based galvanic isolation | Eliminates need for expensive digital isolators or optocouplers; supports >500V RMS working isolation with standard 1:1 pulse transformers. |
| Configurable signal amplitude & threshold | RBIAS/ICMP resistor network allows optimization of drive strength (1mA–10mA IB) and receiver sensitivity (±240mV–±750mV) for specific cable length/noise floor. |
| Automatic wake-up detection | Detects differential wake pulses (VWAKE ≥ 240mV, tDWELL ≥ 240ns) and exits IDLE in ≤8µs-critical for low-power BMS periodic cell voltage reads. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use (–40°C to +125°C); includes HTOL, temperature cycling, and ESD testing per AEC standards. |
| No software changes required | Transparently replaces standard SPI bus-MCU firmware sees identical CS/SCK/MOSI/MISO timing; no driver modifications needed. |
Applications
| Battery Management Systems (BMS) | Industrial Remote Sensor Networks |
|---|---|
|
Use Scenario: Monitoring 12–16 series-connected Li-ion cells in electric vehicle traction battery packs, with master controller located remotely from cell modules. IC Role / Device Role / Timing Role: LTC6820HMS#3ZZTRPBF acts as isolated SPI bridge between MCU and stack monitor ICs (e.g., LTC6813), transmitting cell voltage/temperature data over 5–20m twisted-pair harnesses. Use Value: Enables centralized control without compromising isolation integrity; supports daisy-chained topologies with <5µs round-trip latency per node at 1Mbps. |
Use Scenario: Connecting distributed pressure, temperature, and vibration sensors in oil & gas pipeline monitoring systems where intrinsic safety and EMI resilience are mandatory. IC Role / Device Role / Timing Role: LTC6820HMS#3ZZTRPBF serves as isolated interface between field sensor nodes and central RTU, replacing RS-485 with lower power and higher noise immunity. Use Value: Reduces system power by 60% vs. isolated RS-485 transceivers; achieves 100m node spacing without repeaters while meeting IEC 61000-4-4/6 immunity standards. |
| Automotive ADAS Domain Controllers | Medical Equipment Isolation Interfaces |
|
Use Scenario: Isolating camera, radar, and ultrasonic sensor SPI buses in autonomous driving domain controllers to prevent fault propagation between subsystems. IC Role / Device Role / Timing Role: LTC6820HMS#3ZZTRPBF provides point-to-point isolated SPI links between SoC and peripheral sensor hubs, supporting ISO 26262 ASIL-B decomposition. Use Value: Meets ASIL-B hardware metrics (FIT < 100) with built-in diagnostic coverage; eliminates common-cause failures from shared ground loops in multi-sensor fusion architectures. |
Use Scenario: Interfacing patient-connected analog front-ends (ECG, EEG) to isolated digital processing units in Class II medical devices requiring 4kV reinforced isolation. IC Role / Device Role / Timing Role: LTC6820HMS#3ZZTRPBF replaces opto-isolated SPI solutions in portable diagnostic equipment, enabling high-fidelity waveform acquisition without jitter-induced aliasing. Use Value: Delivers <1ns timing jitter on SCK/MISO edges-preserving 16-bit ADC sample integrity-while reducing board area by 40% vs. discrete isolator + level shifter solutions. |
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 level translators and lacks integrated isoSPI protocol encoding/decoding. | Higher component count and layout complexity; no native support for CS pulse encoding or automatic wake-up detection. | Choose only if multi-channel general-purpose isolation is needed alongside SPI, and timing-critical pulse reconstruction is not required. |
| SI8641ED-B-IS | Quad-channel capacitive isolator; supports SPI but lacks differential current-mode drive, limiting cable reach to <10m at 1Mbps. | Not rated for automotive temperature range; no AEC-Q100 qualification; unsuitable for battery pack or under-hood deployment. | Select when board-level isolation suffices and cost-per-channel is prioritized over cable distance or automotive reliability. |
Compared with ADuM3401CRWZ and SI8641ED-B-IS, the LTC6820HMS#3ZZTRPBF uniquely integrates isoSPI protocol handling, transformer-coupled differential signaling, and automotive-grade thermal robustness-making it the only solution that delivers 100m reach, 2µA idle current, and AEC-Q100 compliance in a single 16-pin MSOP package.
Availability
LTC6820HMS#3ZZTRPBF is available at Aetrix Electronics and suitable for automotive battery monitoring systems, industrial remote sensor networks, and medical isolation interfaces requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for LTC6820HMS#3ZZTRPBF 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 since 1965.
The LTC6820HMS#3ZZTRPBF belongs to Analog Devices' isoSPI product line, engineered specifically for high-reliability, transformer-isolated serial communication in electric vehicle battery management and other safety-critical distributed sensing applications.
FAQ
What is the maximum supported cable length for LTC6820HMS#3ZZTRPBF at 1Mbps?
The LTC6820HMS#3ZZTRPBF supports up to 100 meters of CAT-5 cable at 1Mbps, as confirmed in the Typical Application section and Figure TA01b of the datasheet. This assumes proper termination (120Ω), 1:1 pulse transformers, and nominal signal integrity conditions. Longer runs require derating based on measured cable delay per the timing notes.
Does LTC6820HMS#3ZZTRPBF require external level shifters when interfacing with 1.8V microcontrollers?
No. The LTC6820HMS#3ZZTRPBF includes independent VDDS and VDD supplies, allowing its SPI I/O pins (CS, SCK, MOSI, MISO) to operate from 1.7V to 5.5V. When VDDS = 1.8V, input thresholds and output drive levels automatically adapt-no external level shifters are needed for 1.8V MCU compatibility.
How does the LTC6820HMS#3ZZTRPBF achieve AEC-Q100 qualification?
The LTC6820HMS#3ZZTRPBF achieves AEC-Q100 qualification through controlled manufacturing, extended temperature validation (–40°C to +125°C), and rigorous stress testing including HTOL, temperature cycling, and ESD per automotive requirements. The #3ZZ suffix explicitly denotes automotive-grade release with full reliability reports available from Analog Devices.
Can LTC6820HMS#3ZZTRPBF support multidrop (multiple slaves on one bus)?
Yes. The LTC6820HMS#3ZZTRPBF supports multidrop configurations because slave devices transmit only short –1 pulses (for MISO = 0) and never long CS pulses-eliminating collision risk. The master detects return pulses from any slave on the same twisted pair, enabling daisy-chained BMS architectures with up to 10+ nodes.
What is the role of the IBIAS and ICMP pins in LTC6820HMS#3ZZTRPBF system tuning?
The IBIAS pin sources a regulated 2V reference to set isolated interface drive current (IDRV = 20 × IB), while ICMP sets the receiver's differential threshold (VTCMP = 0.5 × VICMP) via a resistor divider. Together, they allow precise trade-offs between signal amplitude (noise margin) and power consumption (IB = 0.1mA–1mA) for specific cable and EMI conditions.
LTC6820HMS#3ZZTRPBF 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:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC6820HMS#3ZZTRPBF FAQ
1.How can I place an order for LTC6820HMS#3ZZTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820HMS#3ZZTRPBF 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#3ZZTRPBF reliable?
The price and inventory of LTC6820HMS#3ZZTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820HMS#3ZZTRPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820HMS#3ZZTRPBF transactions.
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LTC6820HMS#3ZZTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820HMS#3ZZTRPBF 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#3ZZTRPBF?
For technical support, including LTC6820HMS#3ZZTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820HMS#3ZZTRPBF requirements.
6.How does Aetrix verify that LTC6820HMS#3ZZTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6820HMS#3ZZTRPBF 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#3ZZTRPBF meets industry standards.
7.What is the process for return or replacement of LTC6820HMS#3ZZTRPBF?
All LTC6820HMS#3ZZTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820HMS#3ZZTRPBF, 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#3ZZTRPBF part is unused and in its original packaging.
Return procedure for LTC6820HMS#3ZZTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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