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Texas Instruments ADS131B26QPHPRQ1
- Part No.:
- ADS131B26QPHPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-PowerTQFP
- Datasheet:
-
ADS131B26QPHPRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-VOLTAGE BATTERY-
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
ADS131B26QPHPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive battery pack monitor IC with six integrated ADC channels: two 24-bit simultaneous-sampling current-shunt ADCs (ADC1A/ADC1B), two 24-bit simultaneous-sampling voltage ADCs (ADC3A/ADC3B), and two 16-bit multiplexed temperature/voltage ADCs (ADC2A/ADC2B). It supports ±39 mV to ±312.5 mV shunt full-scale ranges, 500 SPS to 64 kSPS programmable data rates, and SPI interface - deployed in high-voltage EV battery management systems for precise state-of-charge and state-of-health calculation.
For engineers reviewing the ADS131B26QPHPRQ1 datasheet, ADS131B26QPHPRQ1 pinout, ADS131B26QPHPRQ1 application, or ADS131B26QPHPRQ1 equivalent, this page delivers verified technical context, exact pin functions, functional safety compliance (ASIL D), real-world BMS use cases, and validated alternative parts - all grounded in TI's SBASA22B production datasheet and package documentation.
Technical Context
The ADS131B26QPHPRQ1 implements dual redundant 24-bit ΣΔ ADC pairs for current sensing (ADC1A/ADC1B) and voltage sensing (ADC3A/ADC3B), each with independent digital overcurrent comparators and synchronized sampling to eliminate timing skew in SOC/SOH algorithms. Its internal 8.192 MHz main oscillator and diagnostic oscillator enable clock monitoring with 300 kHz watchdog thresholds and 10% frequency mismatch detection.
Two 16-bit multiplexed ADCs (ADC2A/ADC2B) support up to 8 analog inputs per channel for thermistor-based temperature monitoring and auxiliary voltage sensing, using a hardware channel sequencer to reduce SPI overhead. Integrated LDOs accept 4 V–16 V unregulated supply inputs, and on-chip diagnostics include AVDD/IOVDD/DVDD supply monitors, oscillation detectors, and overtemperature warning logic with ±2°C accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit (ADC1/ADC3), 16-bit (ADC2) - enables <1 µV input-referred noise and <0.1% gain error for high-accuracy shunt current measurement |
| Data rate | 500 SPS to 64 kSPS - supports fast transient detection (e.g., overcurrent events) while maintaining DC precision for SOC estimation |
| Offset error (current ADC) | ±1.5 µV max - ensures sub-100 nΩ shunt resistor compatibility without calibration drift compensation |
| Gain drift | 20 ppm/°C max - maintains measurement stability across –40°C to +125°C automotive ambient range |
| Supply range | APWR/DPWR: 2.9 V to 16 V - allows direct connection to unregulated HV battery rails or isolated DC/DC outputs |
| Functional safety | ASIL D systematic & hardware capability - provides documented evidence for ISO 26262 system-level safety analysis |
| Reference voltage | 1.25 V ±0.15% - stable internal reference for all ADC sections, eliminating need for external precision references |
Pinout & Package
ADS131B26QPHPRQ1 is housed in a 48-pin HTQFP (PHP) package with 9 mm × 9 mm footprint and exposed thermal pad connected to AGND. Pin functions are electrically segregated into analog (AGND, AVDD, CPA/CNB, V0A–V7B, RCAPA/RCAPB), digital (DGND, DPWR, IOVDD, SCLK/SDI/SDO, CSn, DRDYn), and mixed-signal (VPA/GPIO0A, VNA/GPIO1A, GPIO2/FAULT, GPIO3/OCCA, GPIO4/OCCB) domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPA / CNB | ADC1A positive/negative differential input | Direct connection to shunt resistor terminals for high-side current sensing with ±39 mV to ±312.5 mV programmable full-scale |
| VPA / VNA | ADC3A positive/negative differential input | Interface to high-voltage resistor divider for synchronous pack voltage measurement with ADC1A/ADC1B |
| V0A–V7A | ADC2A analog multiplexer inputs | Supports 8 thermistor or analog sensor connections per ADC section; sequenced automatically to minimize SPI traffic |
| GPIO3/OCCA | Digital output / overcurrent comparator A flag | Push-pull output asserting within 4 µs of overcurrent event - enables immediate MCU interrupt or hardware shutdown |
| DRDYn | Data-ready indicator | Active-low signal synchronized to conversion completion across all ADC groups - eliminates polling overhead in real-time BMS firmware |
| RCAPA | REFA voltage reference output | 1.25 V ±0.15% buffered reference for external circuitry; requires 1 µF capacitor to AGNDA for stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual redundant 24-bit current ADCs | Enables ASIL D-compliant fault-tolerant current measurement with independent digital overcurrent comparators per channel |
| Synchronized voltage & current sampling | ADC1A/ADC1B and ADC3A/ADC3B share timing domain - eliminates phase misalignment errors in Coulomb counting |
| Integrated supply & oscillation monitors | Detects AVDD/IOVDD/DVDD undervoltage, overvoltage, oscillation (2–500 kHz), and overtemperature with <30 µs response time |
| Hardware channel sequencer (ADC2A/ADC2B) | Automatically cycles through 8 analog inputs per ADC without CPU intervention - reduces SPI bandwidth and firmware complexity |
| 9 GPIOs with PWM capability | Includes dedicated FAULT, OCCA, OCCB outputs plus 5 general-purpose I/Os referenced to AVDD or IOVDD - supports status signaling and control loop actuation |
Applications
| EV Battery Current Monitoring | High-Voltage Pack Voltage Sensing |
|---|---|
Use Scenario: Real-time measurement of bidirectional battery pack current using precision shunt resistors in 400 V–800 V traction battery systems. IC Role / Device Role / Timing Role: Dual 24-bit simultaneous-sampling ADCs (ADC1A/ADC1B) acquire shunt voltage with ±1.5 µV offset error and 20 ppm/°C gain drift - synchronized to voltage ADCs for time-aligned SOC calculation. Use Value: Enables <0.5% current measurement error across –40°C to +125°C, supporting accurate Coulomb counting and cell balancing decisions in ASIL D BMS architectures. |
Use Scenario: High-accuracy measurement of total battery pack voltage via external HV resistor dividers in modular battery packs. IC Role / Device Role / Timing Role: ADC3A/ADC3B provide 24-bit simultaneous-sampling voltage acquisition with programmable ±312.5 mV to ±1.25 V full-scale - sampled synchronously with ADC1A/ADC1B to eliminate time-skew-induced SOC error. Use Value: Achieves <0.1% voltage measurement accuracy at 64 kSPS, enabling precise open-circuit voltage (OCV) tracking and dynamic impedance modeling for health assessment. |
| Thermistor-Based Cell Temperature Mapping | Redundant Power Supply Health Monitoring |
Use Scenario: Monitoring temperature gradients across 16+ series-connected battery cells using NTC thermistors connected to ADC2A/ADC2B inputs. IC Role / Device Role / Timing Role: Two 16-bit multiplexed ADCs (ADC2A/ADC2B) scan up to 8 thermistor voltages each using internal sequencer - no host MCU involvement required for channel cycling. Use Value: Reduces SPI communication load by >70% versus software-controlled muxing, while maintaining ±0.5°C temperature resolution across full automotive range. |
Use Scenario: Continuous validation of APWR, DPWR, IOVDD, and AVDD rail integrity in isolated BMS domains with fail-safe response. IC Role / Device Role / Timing Role: On-die monitors detect undervoltage, overvoltage, oscillation (2–500 kHz), and overtemperature - triggering FAULT pin assertion within 4 µs for AVDD/DVDD events. Use Value: Eliminates need for external supervisor ICs; provides certified ASIL D-compliant power health reporting directly to MCU or safety controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ79616-Q1 | 16-channel 16-bit SAR ADC; no integrated current-shunt ADCs; relies on external amplifiers for shunt sensing | Targeted at cell voltage monitoring only; requires external current-sense signal conditioning and separate overcurrent logic | Select when primary focus is per-cell voltage/temperature with minimal current sensing requirements |
| ADS131M06-Q1 | 6-channel 24-bit ΣΔ ADC; lacks integrated overcurrent comparators, supply monitors, and ASIL D certification documentation | Supports basic current/voltage/temperature acquisition but not full ASIL D system-level safety compliance | Select for cost-sensitive non-ASIL D BMS subsystems where functional safety documentation is not required |
Compared with BQ79616-Q1 and ADS131M06-Q1, ADS131B26QPHPRQ1 uniquely integrates dual redundant current-shunt ADCs with embedded overcurrent comparators, synchronized voltage sampling, and complete ISO 26262 ASIL D development artifacts - making it the only single-chip solution qualified for safety-critical high-voltage current measurement in automotive traction batteries.
Availability
ADS131B26QPHPRQ1 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 qualification.
Supply support for ADS131B26QPHPRQ1 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 ADS131B26QPHPRQ1 belongs to TI's high-voltage battery monitor product line, engineered specifically for ASIL D-compliant EV battery management systems requiring simultaneous, synchronized, and fault-tolerant current, voltage, and temperature acquisition.
FAQ
What is the maximum shunt voltage range supported by ADS131B26QPHPRQ1?
The ADS131B26QPHPRQ1 supports programmable full-scale ranges from ±39 mV to ±312.5 mV on its dual 24-bit current-shunt ADCs (ADC1A/ADC1B). This range accommodates common shunt resistor values (e.g., 50 µΩ to 500 µΩ) used in 100 A–1000 A EV battery current measurement applications while maintaining sub-µV offset error and 20 ppm/°C gain drift performance across the full automotive temperature range.
Does ADS131B26QPHPRQ1 require an external clock source?
No, ADS131B26QPHPRQ1 includes an internal 8.192 MHz main oscillator (OSCM) and a separate diagnostic oscillator (OSCD), both with ±2.5% accuracy. An external clock is optional and only needed if higher frequency stability is required. The device uses OSCM for normal operation and OSCD for clock monitoring - enabling fault detection when frequency deviation exceeds 10% or drops below 300 kHz.
How does ADS131B26QPHPRQ1 support functional safety compliance up to ASIL D?
ADS131B26QPHPRQ1 supports ASIL D through documented systematic capability (requirements traceability, FMEDA, safety analysis reports) and hardware capability (dual redundant ADC paths, clock and supply monitors, built-in self-test features, and failure mode coverage >90%). TI provides ISO 26262 safety manuals, FMEDA reports, and safety case documentation - all explicitly validated for ADS131B26QPHPRQ1, not just the broader family.
Can ADS131B26QPHPRQ1 measure temperature directly using on-die sensors?
No, ADS131B26QPHPRQ1 does not include on-die temperature sensors. It supports external thermistor or analog-output temperature sensor interfacing via its two 16-bit multiplexed ADCs (ADC2A/ADC2B), each with 8 analog inputs. These ADCs feature automatic channel sequencing and programmable gain (1/2/4) to optimize resolution for NTC voltage outputs across –40°C to +125°C.
What package type and thermal characteristics does ADS131B26QPHPRQ1 use?
ADS131B26QPHPRQ1 uses a 48-pin HTQFP (PHP) package with 9 mm × 9 mm body and exposed thermal pad. Its thermal metrics include RθJA = 23.7°C/W and RθJB = 7.8°C/W, enabling reliable operation at 105°C ambient when mounted on 2 oz copper PCB with thermal vias under the pad. The thermal pad must be soldered to AGND for optimal heat dissipation and EMI performance.
ADS131B26QPHPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 64k
- Number of Inputs:
- 6
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:4
- Number of A/D Converters:
- 4
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.9V ~ 16V
- Voltage - Supply, Digital:
- 2.9V ~ 16V
- Features:
- Comparator, GPIO, Oscillator, PGA, Temp Sensor
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 48-HTQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS131B26QPHPRQ1 FAQ
1.How can I place an order for ADS131B26QPHPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS131B26QPHPRQ1 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 ADS131B26QPHPRQ1 reliable?
The price and inventory of ADS131B26QPHPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131B26QPHPRQ1 is usually 5 days.
3.What payment methods are accepted for ADS131B26QPHPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131B26QPHPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS131B26QPHPRQ1?
ADS131B26QPHPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS131B26QPHPRQ1 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 ADS131B26QPHPRQ1?
For technical support, including ADS131B26QPHPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131B26QPHPRQ1 requirements.
6.How does Aetrix verify that ADS131B26QPHPRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS131B26QPHPRQ1 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 ADS131B26QPHPRQ1 meets industry standards.
7.What is the process for return or replacement of ADS131B26QPHPRQ1?
All ADS131B26QPHPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS131B26QPHPRQ1, 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 ADS131B26QPHPRQ1 part is unused and in its original packaging.
Return procedure for ADS131B26QPHPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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