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Analog Devices Inc. LTC6820HMS#3ZZPBF
- Part No.:
- LTC6820HMS#3ZZPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6820HMS#3ZZPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:154
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Product details
Overview
LTC6820HMS#3ZZPBF 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, AEC-Q100 qualification (H-grade), and ISO26262 system compliance - deployed in automotive battery monitoring systems for high-noise, high-reliability cell voltage acquisition.
For engineers reviewing the LTC6820HMS#3ZZPBF datasheet, LTC6820HMS#3ZZPBF pinout, LTC6820HMS#3ZZPBF application, or LTC6820HMS#3ZZPBF equivalent, key selection criteria include its 16-pin MSOP package with automotive-grade temperature range (–40°C to 125°C), configurable noise immunity via IBIAS/ICMP resistor network, wake-up detection on IP/IM differential input, and compatibility with standard pulse transformers without center tap.
Technical Context
The LTC6820HMS#3ZZPBF implements a transformer-coupled isoSPI physical layer using matched source/sink current drivers on IP/IM pins and precision window comparators on the receiver side. Its bidirectional protocol encodes CS, SCK, MOSI, and MISO transitions into symmetric ±VA pulse pairs (short for data, long for chip select), eliminating DC bias and enabling robust operation in EMI-heavy environments.
Configuration is hardware-driven: MSTR pin selects master/slave role; PHA/POL pins set SPI mode (0–3); SLOW pin enables timing relaxation for ≤200kHz clocks; IBIAS and ICMP pins jointly configure drive current (20×IB) and comparator threshold (0.5×VICMP) via external resistor divider - allowing optimization for cable length, signal-to-noise ratio, and power consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Method | Galvanic isolation via external pulse transformer; no center tap required due to matched current drive. |
| Data Rate | Up to 1Mbps over 100m twisted pair (CAT-5 assumed); derated for longer cables per propagation delay. |
| Supply Range | VDD = 2.7V–5.5V; VDDS = 1.7V–5.5V for independent level shifting of SPI I/O logic. |
| Idle Current | 1µA (MSTR = VDD) or 2µA (MSTR = 0V) - enables ultra-low-power sleep in battery-monitoring nodes. |
| Operating Temp | –40°C to +125°C (H-grade, automotive qualified); validated per AEC-Q100 Grade 0. |
| Wake-Up Latency | <8µs after CS falling edge (master) or IP/IM activity (slave); supports rapid system responsiveness. |
| Logic Compatibility | Interfaces to 1.7V–5.5V logic families; VIH/VIL thresholds scale with VDDS for seamless level translation. |
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 |
|---|---|---|
| EN | Enable Input | Forces active state when high; otherwise enters IDLE after 5.7ms timeout - critical for power-gating control. |
| MOSI / MISO / SCK / CS | SPI Interface Pins | Open-drain (MOSI/MISO) or push-pull (SCK/CS); referenced to VDDS for level-shifting - decouples logic supply from core VDD. |
| MSTR | Master/Slave Selector | Tie to VDD for master (microcontroller side), GND for slave (remote sensor side) - defines direction of isoSPI traffic flow. |
| IP / IM | Differential Isolated Interface | Current-mode transmitter/receiver pair; drives/reads differential pulses across transformer - no DC path, low EMI. |
| IBIAS / ICMP | Bias & Threshold Control | Resistor-divider network sets drive current (20×IB) and receiver threshold (0.5×VICMP) - enables SNR vs. power trade-off. |
| POL / PHA / SLOW | SPI Timing Configuration | Hardware-selectable SPI mode (0–3) and timing margin (fast/slow clock modes) - eliminates firmware configuration overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-Coupled isoSPI | Enables >500V isolation with off-the-shelf 1:1 pulse transformers - avoids costly integrated isolators. |
| Configurable Noise Immunity | Adjustable comparator threshold (0.2V–1.5V) and drive current (0.1mA–1mA IBIAS) optimize for EMI-prone battery packs. |
| Ultralow Idle Power | 1–2µA shutdown current extends battery life in always-on BMS monitoring nodes between measurements. |
| AEC-Q100 Qualified | H-grade qualification (–40°C to +125°C) with automotive reliability reports - suitable for ASIL-B/C system integration. |
| No Software Changes Required | Transparent SPI passthrough - microcontrollers and slaves operate unchanged; only physical layer is replaced. |
Applications
| Battery Management Systems (BMS) | Automotive Cell Monitoring |
|---|---|
Use Scenario: Monitoring individual Li-ion cell voltages in high-voltage EV battery packs with >400V common-mode potential between modules. IC Role / Device Role / Timing Role: Isolates MCU-side SPI commands from high-side cell monitor ICs via twisted-pair bus, rejecting ground loops and conducted noise. Use Value: Enables safe, accurate voltage sampling at 125°C ambient while maintaining 1Mbps update rates - critical for thermal runaway prevention. | Use Scenario: Distributed voltage/temperature sensing across multiple battery modules in hybrid powertrain systems. IC Role / Device Role / Timing Role: Acts as slave-side isoSPI transceiver, converting received pulses back to SPI signals for local ADCs and transmitting MISO responses. Use Value: Supports multidrop topology with collision-free short-pulse return signaling - reduces wiring harness weight and cost vs. optocoupler-based solutions. |
| Industrial Energy Storage | Remote Sensor Networks |
Use Scenario: Connecting rack-level BMS controllers to string-level monitoring units in grid-scale lithium iron phosphate (LFP) storage systems. IC Role / Device Role / Timing Role: Master-side isoSPI interface translating MCU SPI to isolated differential pulses over 100m inter-rack cabling. Use Value: Maintains 1Mbps throughput at full 100m distance with <1% bit error rate - ensures real-time state-of-charge synchronization across large installations. | Use Scenario: Isolating environmental sensors (voltage, current, temp) in high-noise industrial motor control cabinets. IC Role / Device Role / Timing Role: Slave device receiving isolated SPI commands and returning digitized sensor data via isoSPI return pulses. Use Value: Eliminates ground bounce-induced measurement errors in 48V–400V DC systems - improves accuracy to ±0.5mV over temperature. |
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 isoSPI protocol engine. | Used where discrete isolation of SCK/CS/MOSI/MISO is acceptable; lacks native pulse encoding/decoding and cable-length optimization. | Select when needing higher speed or multi-channel isolation beyond SPI, but accept added firmware complexity and layout overhead. |
| MAX14930AWE+T | Single-channel reinforced isolator with integrated isoSPI-like protocol; supports 15Mbps, but only -40°C to +105°C grade (not AEC-Q100 H-grade). | Targeted at industrial automation; lacks automotive qualification and 125°C operation required for under-hood BMS deployment. | Choose for non-automotive high-speed isolated SPI where extended temperature range is not mandatory. |
Compared with ADuM3401CRWZ and MAX14930AWE+T, the LTC6820HMS#3ZZPBF uniquely combines AEC-Q100 H-grade qualification, native isoSPI protocol handling, and 100m cable support in a single-chip solution - reducing BOM count, PCB area, and validation effort for automotive battery monitoring.
Availability
LTC6820HMS#3ZZPBF is available at Aetrix Electronics and suitable for automotive battery management systems, industrial energy storage monitoring, and remote sensor networks requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for LTC6820HMS#3ZZPBF 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 precision instrumentation, industrial automation, and automotive markets.
The LTC6820HMS#3ZZPBF belongs to Analog Devices' isoSPI product line, engineered specifically for high-reliability, transformer-isolated communication in electric vehicle battery monitoring and other safety-critical distributed sensing applications.
FAQ
What is the primary function of the LTC6820HMS#3ZZPBF in a battery management system?
The LTC6820HMS#3ZZPBF serves as an isoSPI isolated communications interface that enables bidirectional SPI signal transmission across a galvanic isolation barrier using a single twisted-pair cable. In a BMS, it connects the main MCU to high-side cell monitoring ICs, rejecting ground loop noise and supporting reliable operation at up to 125°C ambient temperature - a core requirement for automotive traction battery monitoring.
Does the LTC6820HMS#3ZZPBF require external components to operate, and if so, which ones are mandatory?
Yes, the LTC6820HMS#3ZZPBF requires three mandatory external components: a resistor divider (RB1 + RB2) between IBIAS and GND to set drive current and comparator threshold; a termination resistor (RM = 100Ω typical) across the twisted-pair cable; and a pulse transformer (1:1, center-tap not required) bridging the isolation barrier. Optional components include bypass capacitors (≥0.01µF) on VDD and VDDS.
How does the LTC6820HMS#3ZZPBF achieve AEC-Q100 qualification, and what does the #3ZZ suffix indicate?
The #3ZZ suffix on LTC6820HMS#3ZZPBF denotes Analog Devices' controlled manufacturing process for automotive applications, including enhanced screening, traceability, and reliability testing per AEC-Q100 Grade 0 (–40°C to +125°C). This version undergoes additional qualification beyond standard commercial parts - confirmed by Automotive Reliability Reports available through Analog Devices' sales representatives.
Can the LTC6820HMS#3ZZPBF support multidrop configurations, and how is bus contention avoided?
Yes, the LTC6820HMS#3ZZPBF supports multidrop slave configurations. Bus contention is avoided because only the master transmits long pulses (CS control), while slaves transmit only short –1 pulses (for MISO = 0) - never short +1 or long pulses. This unidirectional return channel design prevents collisions, enabling multiple LTC6820HMS#3ZZPBF slaves on one twisted-pair bus without arbitration logic.
What is the role of the SLOW pin on the LTC6820HMS#3ZZPBF, and when should it be asserted?
The SLOW pin on the LTC6820HMS#3ZZPBF disables high-speed timing constraints to accommodate slower slave devices or marginal signal integrity. It must be tied to VDD when the SPI clock frequency is ≤200kHz or when slave timing margins (e.g., t12, t14) cannot be met with default settings - extending setup/hold windows from nanoseconds to microseconds and relaxing rise-time requirements on pull-up resistors.
LTC6820HMS#3ZZPBF 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:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC6820HMS#3ZZPBF FAQ
1.How can I place an order for LTC6820HMS#3ZZPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6820HMS#3ZZPBF 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#3ZZPBF reliable?
The price and inventory of LTC6820HMS#3ZZPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6820HMS#3ZZPBF is usually 5 days.
3.What payment methods are accepted for LTC6820HMS#3ZZPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6820HMS#3ZZPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6820HMS#3ZZPBF?
LTC6820HMS#3ZZPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6820HMS#3ZZPBF 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#3ZZPBF?
For technical support, including LTC6820HMS#3ZZPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6820HMS#3ZZPBF requirements.
6.How does Aetrix verify that LTC6820HMS#3ZZPBF is sourced from the original manufacturer or authorized distributors?
All LTC6820HMS#3ZZPBF 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#3ZZPBF meets industry standards.
7.What is the process for return or replacement of LTC6820HMS#3ZZPBF?
All LTC6820HMS#3ZZPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6820HMS#3ZZPBF, 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#3ZZPBF part is unused and in its original packaging.
Return procedure for LTC6820HMS#3ZZPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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