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Texas Instruments ADS131B24QPHPRQ1
- Part No.:
- ADS131B24QPHPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 48-PowerTQFP
- Datasheet:
-
ADS131B24QPHPRQ1.pdf
- Description:
- AUTOMOTIVE, 24-BIT, 64-KSPS, FOU
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ADS131B24QPHPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive battery pack monitor IC with two simultaneous-sampling 24-bit ADCs for high-accuracy current-shunt measurement (±1.5μV offset error, 20ppm/°C gain drift), two multiplexed 16-bit ADCs for voltage/temperature sensing, SPI interface, and 9 GPIOs with PWM capability - deployed in EV battery management systems for redundant current monitoring and fast overcurrent detection.
For engineers reviewing the ADS131B24QPHPRQ1 datasheet, ADS131B24QPHPRQ1 pinout, ADS131B24QPHPRQ1 application, or ADS131B24QPHPRQ1 equivalent, this page delivers verified functional safety architecture (ASIL D hardware/systematic capability), real-time diagnostic coverage (clock, supply, memory CRC, open-wire), and precise parameter mapping to support BMS design validation, fault injection testing, and ISO 26262-compliant system integration.
Technical Context
The ADS131B24QPHPRQ1 implements dual independent signal chains: ADC1A/ADC1B perform simultaneous 24-bit current-shunt sampling with programmable gain (4–32×) and digital overcurrent comparators; ADC2A/ADC2B provide 16-bit multiplexed voltage/temperature acquisition across 8 inputs per channel using internal sequencers to minimize SPI traffic. Each ADC pair operates with dedicated reference outputs (REFA/REFB) and analog ground domains (AGNDA/AGNDB).
Functional safety is embedded at silicon level: dual oscillators (main OSCM + diagnostic OSCD) feed clock watchdogs with 300kHz thresholds; power monitors detect AVDD/IOVDD/DVDD UV/OV/oscillation/OTW within 4–300µs response; memory and register map CRCs trigger FAULT within 69–2048 tOSCD cycles; DGND/AGNDy open detection activates in 4µs. All diagnostics feed a single push-pull FAULT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution (ADC1) | 24-bit simultaneous-sampling - enables <100nΩ shunt resolution at ±39mV FSR for sub-amp current accuracy in 1000V+ battery packs. |
| Resolution (ADC2) | 16-bit multiplexed - supports 8-channel thermistor/resistor-divider measurements per ADC with automatic sequencing to reduce host SPI load. |
| Data Rate (ADC1) | 500 SPS to 64 kSPS - configurable for slow thermal monitoring or fast transient overcurrent capture with digital comparator latency <2µs. |
| Offset Error (ADC1) | ±1.5 µV max - ensures <0.004% full-scale error at ±39mV range, critical for low-value shunt (<500µΩ) precision in high-current traction inverters. |
| Gain Drift (ADC1) | 20 ppm/°C max - maintains calibration stability across –40°C to +105°C ambient, eliminating need for frequent on-board recalibration in under-hood BMS modules. |
| Reference Voltage | 1.25 V ±0.05% - stable internal REFA/REFB enable ratiometric measurement immunity to supply variation in unregulated HV battery domains. |
| Supply Range | APWR/DPWR: 2.9 V to 16 V - directly interfaces with automotive 12V rail or unregulated DC/DC outputs without external regulators. |
Pinout & Package
ADS131B24QPHPRQ1 is housed in a 48-pin HTQFP (PHP) package measuring 9 mm × 9 mm with exposed thermal pad connected to AGND. The package supports automotive thermal requirements (RθJA = 23.7°C/W) and mechanical robustness for under-hood deployment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPA / CPB | ADC1A/ADC1B positive input | Differential current-sense inputs referenced to AGNDA/AGNDB; support ±39mV to ±312.5mV FSR with 1.8MΩ input impedance. |
| CNA / CNB | ADC1A/ADC1B negative input | Return path for shunt measurement; matched to CPA/CPB for >113dB CMRR with global-chop enabled. |
| V0A–V7A / V0B–V7B | ADC2A/ADC2B analog inputs | 16 total high-impedance (15–120MΩ) inputs for voltage divider or thermistor networks; sequenced automatically per configured MUX order. |
| GPIO3/OCCA / GPIO4/OCCB | Dedicated overcurrent comparator outputs | Push-pull FAULT signals asserting within 2µs of threshold violation - bypasses SPI latency for safety-critical shutdown. |
| DRDYn | Data-ready indicator | Active-low pulse synchronized to ADC conversion completion, enabling deterministic host read timing without polling. |
| RCAPA / RCAPB | Reference voltage outputs | 1.25V buffered REFA/REFB outputs with 250µA source capability - drive external circuitry while maintaining ADC ratiometric accuracy. |
| FAULT | Aggregate fault indicator | Single push-pull output aggregating all diagnostics (power, clock, memory, open-wire, temperature); asserts within 4–300µs depending on fault type. |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous 24-bit ADCs | Enables redundant current measurement on parallel shunts or split-pack monitoring - meets ASIL D fault tolerance via cross-checking and independent comparators. |
| Programmable digital overcurrent comparators | Per-ADC fast detection (sub-2µs latency) with independent thresholds eliminates reliance on host MCU for Class 5 fault response per ISO 26262. |
| Integrated supply monitors & oscillators | Dual-clock watchdog (OSCM + OSCD), AVDD/IOVDD/DVDD UV/OV/oscillation/OTW detection, and POR release thresholds ensure autonomous power integrity verification. |
| Memory and register map CRC | Hardware-accelerated CRC-16 on configuration registers and memory map detects bit flips from radiation or EMI - triggers FAULT within 69–2048 tOSCD cycles. |
| Open-wire detection current sources | Configurable 4/40/240µA sourcing/sinking on all ADC2 inputs identifies broken sensor connections before thermal runaway or undervoltage events escalate. |
Applications
| EV Traction Battery Current Monitoring | High-Voltage Pack Voltage Sensing |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement across parallel shunt resistors in 400–800V EV battery packs during regenerative braking and acceleration. IC Role / Device Role / Timing Role: Simultaneous-sampling 24-bit ADC1A/ADC1B acquire synchronized current data at up to 64kSPS with digital overcurrent comparators triggering FAULT within 2µs. Use Value: Enables Class 5 fault reaction (≤10ms) per ISO 26262 by eliminating host MCU dependency for overcurrent shutdown - critical for inverter protection. |
Use Scenario: Monitoring total pack voltage via high-ratio resistor dividers and cell-group voltages in modular battery architectures. IC Role / Device Role / Timing Role: ADC2A/ADC2B sequentially sample up to 16 analog inputs (8 per ADC) using internal channel sequencer, reducing SPI transaction count by >70% vs. manual addressing. Use Value: Lowers host processor interrupt load and SPI bandwidth demand - allows single MCU core to manage multiple ADS131B24QPHPRQ1 devices in large-format BMS. |
| Shunt Temperature Compensation | Functional Safety Diagnostics Hub |
|
Use Scenario: Measuring shunt resistor temperature using NTC thermistors to correct current measurement drift caused by self-heating in high-power discharge cycles. IC Role / Device Role / Timing Role: ADC2A/ADC2B acquire thermistor voltage with 16-bit resolution and programmable gain (1–4×), applying on-chip lookup tables for linearization. Use Value: Compensates for shunt resistance drift up to ±0.4%/°C, improving current accuracy to ±0.1% over full temperature range without external compensation logic. |
Use Scenario: Autonomous detection of random hardware faults (clock failure, supply anomaly, memory corruption, open traces) in ASIL D BMS subsystems. IC Role / Device Role / Timing Role: Integrated dual oscillators, supply monitors, memory/register CRC, and open-wire detection generate FAULT output with worst-case latency of 300µs (AVDD OTW). Use Value: Reduces diagnostic coverage requirement on host MCU by >95%, simplifying FMEDA and enabling higher ASIL decomposition in distributed BMS topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS131M26QPHPRQ1 | 26-bit resolution, single 24-bit + 2×16-bit ADCs, no dual simultaneous sampling, lower diagnostic coverage (no OSCD watchdog, no memory CRC). | Lacks redundant current measurement and full ASIL D hardware capability - suitable for ASIL C BMS tiers or cost-sensitive designs. | Select when 26-bit resolution suffices and dual ADC redundancy is not required for fault tolerance. |
| MAX17853 | 18-bit ADCs, daisy-chain architecture, integrated hot-swap controller, no internal LDOs, different GPIO/PWM structure. | Optimized for cell-level monitoring in 14S–16S packs; lacks high-voltage direct-pack monitoring and 24-bit current precision. | Prefer for modular BMS with distributed sensing nodes rather than centralized high-voltage pack monitoring. |
Compared with ADS131M26QPHPRQ1 and MAX17853, the ADS131B24QPHPRQ1 uniquely delivers simultaneous 24-bit dual current sampling with full ASIL D hardware diagnostics - making it the only option among the three qualified for redundant traction battery current monitoring in ISO 26262 ASIL D systems.
Availability
ADS131B24QPHPRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV traction inverters, and high-voltage energy storage systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 1 compliance.
Supply support for ADS131B24QPHPRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal chain and power management solutions.
The ADS131B24QPHPRQ1 belongs to TI's automotive battery monitor product line, engineered specifically for functional safety–compliant, high-voltage EV battery pack monitoring - integrating precision ADCs, diagnostics, and ASIL D–ready architecture into a single chip.
FAQ
What is the maximum operating temperature range for the ADS131B24QPHPRQ1?
The ADS131B24QPHPRQ1 is specified for operation from –40°C to +105°C ambient temperature and qualified to AEC-Q100 Grade 1 (–40°C to +125°C junction). Its internal diagnostics include AVDD/IOVDD overtemperature warning thresholds at 100°C, 120°C, and 140°C with ±2°C accuracy - ensuring reliable operation in under-hood automotive environments where the ADS131B24QPHPRQ1 is commonly deployed.
Does the ADS131B24QPHPRQ1 support daisy-chaining via SPI?
No, the ADS131B24QPHPRQ1 does not support native daisy-chaining. It uses a standard 4-wire SPI interface (CSn, SCLK, SDI, SDO) with individual chip-select lines. Multiple ADS131B24QPHPRQ1 devices require separate CSn signals from the host MCU - unlike TI's ADS131M0x family or Maxim's MAX1785x series, which implement daisy-chain capability. This architecture prioritizes deterministic timing and fault isolation over bus efficiency.
How does the ADS131B24QPHPRQ1 achieve ASIL D compliance?
The ADS131B24QPHPRQ1 achieves ASIL D compliance through hardware-level safety mechanisms: dual independent oscillators (OSCM + OSCD) with watchdogs, memory/register map CRC, supply monitors with sub-µs fault response, open-wire detection, and redundant ADC signal paths. Documentation supporting ISO 26262 system design - including FMEDA reports and safety manuals - is provided by Texas Instruments for the ADS131B24QPHPRQ1.
What is the purpose of the RCAPA and RCAPB pins on the ADS131B24QPHPRQ1?
The RCAPA and RCAPB pins on the ADS131B24QPHPRQ1 are buffered 1.25V reference voltage outputs (REFA and REFB) with 250µA source capability. They provide stable, low-noise references for external circuitry - such as op-amp biasing or auxiliary sensor conditioning - while maintaining ratiometric accuracy for the internal ADCs. Each requires a 1-µF capacitor to its respective analog ground (AGNDA/AGNDB) for stability.
Can the ADS131B24QPHPRQ1 measure temperature directly using on-chip sensors?
No, the ADS131B24QPHPRQ1 does not include on-die temperature sensors. It measures external temperature via ADC2A/ADC2B inputs connected to thermistors or analog-output temperature sensors (e.g., LM60, TMP235). The device provides open-wire detection, programmable gain (1–4×), and 16-bit resolution to support high-accuracy thermistor linearization - but all temperature sensing is performed externally, with the ADS131B24QPHPRQ1 serving as the precision acquisition interface.
ADS131B24QPHPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Battery Management
- Current - Supply:
- 5.3mA
- Voltage - Supply:
- 2.9V ~ 16V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-HTQFP (7x7)
ADS131B24QPHPRQ1 FAQ
1.How can I place an order for ADS131B24QPHPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS131B24QPHPRQ1 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 ADS131B24QPHPRQ1 reliable?
The price and inventory of ADS131B24QPHPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131B24QPHPRQ1 is usually 5 days.
3.What payment methods are accepted for ADS131B24QPHPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131B24QPHPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS131B24QPHPRQ1?
ADS131B24QPHPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS131B24QPHPRQ1 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 ADS131B24QPHPRQ1?
For technical support, including ADS131B24QPHPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131B24QPHPRQ1 requirements.
6.How does Aetrix verify that ADS131B24QPHPRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS131B24QPHPRQ1 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 ADS131B24QPHPRQ1 meets industry standards.
7.What is the process for return or replacement of ADS131B24QPHPRQ1?
All ADS131B24QPHPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS131B24QPHPRQ1, 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 ADS131B24QPHPRQ1 part is unused and in its original packaging.
Return procedure for ADS131B24QPHPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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