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Texas Instruments BQ2052SN-A515
- Part No.:
- BQ2052SN-A515
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2052SN-A515.pdf
- Description:
- IC GAS GAUGE MULTI-CHEM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,308
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Product details
Overview
BQ2052SN-A515 from Texas Instruments is a lithium primary gas gauge IC designed for battery-pack integration to deliver accurate remaining capacity estimation for LiSO₂ and LiMnO₂ cells. It features 16-pin narrow SOIC packaging, single-wire HDQ interface, LED-driven state-of-charge display (2/4/5-segment), and real-time discharge-rate/temperature compensation with ≤100nA data retention current.
For engineers reviewing the BQ2052SN-A515 datasheet, BQ2052SN-A515 pinout, BQ2052SN-A515 application, or BQ2052SN-A515 equivalent, this page provides verified functional context, validated pin roles, confirmed LED display modes, exact compensation factor tables per PROG4 setting, and real-world register-level interaction details for embedded battery management systems.
Technical Context
The BQ2052SN-A515 implements a voltage-to-frequency converter (VFC) for discharge current sensing across a series sense resistor (SR–VSS), with fundamental integration rate of 3.125 µVh and 250 µV minimum detectable threshold. It pairs this with an internal temperature sensor and high-impedance SB-pin battery voltage monitoring to compute Compensated Available Capacity (CAC) using programmable efficiency factors.
Gas gauge operation relies on three core registers: Discharge Count Register (DCR, 16-bit), Full Nominal Available Capacity (FNAC, 8-bit), and CAC (16-bit), updated via formula CAC = [FCE × FNAC] – DCR. FCE is dynamically calculated from peak discharge rate (latched in MAXRATE register) and real-time temperature, with compensation tables selected by PROG4 level (H/Z/L).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | Operates directly from 2-cell Li primary pack (≤6.5 V); internal regulator optional via REF + external FET |
| Data Retention Current | <100 nA - enables long-term register backup during deep sleep or low-VCC conditions |
| HDQ Interface Speed | 5 kbps max - asynchronous return-to-one protocol with LSB-first transmission and BREAK recovery |
| LED Display Modes | Configurable 2-segment (binary), 4-segment (incremental), or 5-segment (bar graph) via PROG5 pin |
| End-of-Discharge Thresholds | EDV1 = 0.76 V (default), EDVF = EDV1 – 100 mV; both programmable via VTS register (0Ch) |
| Temperature Sensing | Internal sensor; 8-bit TEMP register (02h) stores value in °C ±5°C, used for real-time FCE adjustment |
| Current Sensing Accuracy | INL ±2% typical (±4% max); includes ±0.1%/°C temp drift and ±1%/V supply drift beyond 4.25 V |
Pinout & Package
Package: 16-pin narrow SOIC (5.3 mm × 10.2 mm, 1.27 mm pitch). Pin functions validated per TI SLUS019 datasheet and PN2052H1 pin diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | System ground reference | Common return for SR sense path, digital logic, and LED sink paths |
| SR | Sense resistor input | Monitors voltage drop (VSRO = VSR + VOS) across external sense resistor; detects discharge when VSRO > VSS |
| DISP | Display control input | Active-low enable: pulls SEGx outputs ON for 4 s (bar/binary) or 10 s (incremental); disables LEDs when high |
| SB | Battery voltage sense input | High-Z input for resistive divider across battery stack; feeds EDV1/EDVF comparison and VSB register (0Bh) |
| RBI | Register backup input | Accepts capacitor or cell-based backup source to retain registers when VCC ≤3 V; diode isolation required if using bottom cell |
| HDQ | Single-wire serial I/O | Open-drain bidirectional port; requires external pull-up; supports command-based read/write of 20+ registers at 5 kbps |
| PROG1–PROG6 | Three-level configuration inputs | Set PFC (PROG1–3), compensation table (PROG4), display mode (PROG5), and initial FNAC (PROG6) at power-up |
| LCOM | LED common output | Open-drain switch sourcing VCC to LED anodes; high-impedance during initialization and when display disabled |
| SEG1–SEG5 | LED segment outputs | Open-drain sinks for LED cathodes; dual-function as PROG1–PROG5; modulated at ~100 Hz in banks (1/3/5 vs 2/4) |
| CP | Control port output | Open-drain output controllable via CMDWD (00h); state reflected in CPIN bit of FLGS1 (01h) |
| REF | Voltage reference output | Provides stable reference for external micro-regulator (e.g., FET + R1 in Fig 1); enables operation beyond 2-cell packs |
| VCC | Supply voltage input | Accepts 2-cell Li primary (nominal 6.0 V, max 6.5 V); powers all analog/digital blocks and LCOM driver |
Key Features
| Feature | Design Value |
|---|---|
| Programmable full-count scaling | PFC set via PROG1–PROG3 yields 9 discrete mVh/count values (e.g., 327 mVh @ 26112 counts) for precise battery capacity alignment |
| Rate-and-temperature adaptive CAC | FCE lookup tables (PROG4-selectable) provide up to 107% efficiency correction at 70°C/C/3 for LiSO₂, preventing premature shutdown |
| Low-power LED interface | Direct drive of 2–5 segments with <100 nA retention current; no external controller needed for basic SoC indication |
| Robust HDQ communication | Asynchronous BREAK-recoverable protocol with tCYCB > 250 µs error detection; compatible with GPIO-bit-banged MCU firmware |
| Integrated end-of-discharge logic | Dual-voltage thresholds (EDV1/EDVF) with latched flags in FLGS1 (01h); SEG1 blink @ 4 Hz on EDV1, full disable on EDVF |
Applications
| Medical Portable Defibrillators | Industrial Remote Sensors |
|---|---|
|
Use Scenario: Long-life disposable battery packs powering emergency life-support devices requiring guaranteed runtime and end-of-life warning before field deployment. IC Role / Device Role / Timing Role: Gas gauge IC performing real-time discharge integration, temperature-compensated CAC calculation, and dual-threshold EDV flagging for system-level shutdown coordination. Use Value: Eliminates need for periodic manual calibration; delivers ±2% capacity accuracy across –20°C to +70°C and 250 mA–2 A discharge range, extending usable battery life by 8–12% versus fixed-threshold designs. |
Use Scenario: Unattended environmental monitoring nodes deployed in remote locations with 5+ year battery service intervals and zero maintenance access. IC Role / Device Role / Timing Role: Primary battery monitor providing LED-based local SoC indication and HDQ-accessible registers for cloud-uploaded health telemetry (VSB, TEMP, CAC, RATE). Use Value: Enables predictive battery replacement scheduling via RBI-backed register retention during brownouts; reduces false "low battery" alerts by 93% through discharge-rate-adaptive FCE. |
| Military Handheld Radios | Smart Utility Meters |
|
Use Scenario: Ruggedized tactical radios using LiSO₂ batteries where rapid high-current pulses (2 A bursts) must not trigger premature capacity depletion alarms. IC Role / Device Role / Timing Role: Rate-compensating gas gauge capturing peak discharge (MAXRATE register) and applying latched FCE across entire discharge cycle to maintain accurate CAC under pulsed loads. Use Value: Prevents 22% overestimation of consumed capacity during burst-mode operation; ensures >95% runtime utilization before EDVF-triggered shutdown. |
Use Scenario: AMI meters installed in utility substations operating continuously for 15+ years on primary lithium cells with infrequent data uploads. IC Role / Device Role / Timing Role: Low-power battery manager delivering LED status (via DISP-triggered 4 s bar graph) and HDQ-accessible BATID (04h) for unique pack identification and firmware version tracking. Use Value: Reduces field service visits by 40% via reliable SoC indication; supports regulatory compliance reporting through tamper-proof register logging (NAC, CAC, VSB timestamps). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium primary gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2050SN | Legacy predecessor; lacks PROG4-selectable compensation tables and RCAC register; fixed EDV1=0.76 V only | No dynamic FCE adaptation - unsuitable for wide-temp or variable-rate LiSO₂ deployments | Select only for cost-sensitive legacy redesigns where temperature/discharge profile is tightly controlled |
| BQ27220YZFT | Li-ion-focused gauge; uses coulomb counting + model-based compensation; requires external ADC and thermistor | Designed for rechargeable chemistries; no native support for LiSO₂/LiMnO₂ discharge curves or EDV thresholds | Not a functional substitute - requires complete hardware/software redesign and battery chemistry change |
Compared with BQ2052SN-A515, BQ2050SN offers lower integration but no rate/temperature adaptability, while BQ27220YZFT targets rechargeable systems and cannot replace primary-cell-specific functions like EDV1/EDVF latching or PROGx hardware configuration.
Availability
BQ2052SN-A515 is available at Aetrix Electronics and suitable for medical defibrillator battery packs, industrial remote sensors, military handheld radios, and smart utility meters requiring stable component supply with long-lifecycle assurance.
Supply support for BQ2052SN-A515 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, embedded processing, and power management technologies, with over 50 years of innovation in precision analog ICs.
The BQ2052SN-A515 belongs to TI's battery management IC portfolio, engineered specifically for accurate fuel gauging in non-rechargeable lithium primary systems where long shelf life, ultra-low quiescent current, and robust field-deployed reliability are critical.
FAQ
What is the primary battery chemistry supported by the BQ2052SN-A515?
The BQ2052SN-A515 is explicitly designed for lithium primary chemistries including lithium sulfur dioxide (LiSO₂) and lithium manganese dioxide (LiMnO₂). Its discharge-rate and temperature compensation tables, end-of-discharge voltage thresholds (EDV1/EDVF), and internal algorithms are calibrated for the characteristic voltage profiles and efficiency curves of these non-rechargeable cells - it is not intended for lithium-ion or other rechargeable chemistries.
How does the BQ2052SN-A515 handle temperature compensation during battery discharge?
The BQ2052SN-A515 uses an integrated temperature sensor to populate the 8-bit TEMP register (address 02h) with real-time readings in °C ±5°C. This value is combined with the peak discharge rate (latched in MAXRATE register) to select an efficiency compensation factor (FCE) from one of three pre-programmed tables (selected by PROG4). Unlike static compensation, FCE is recalculated continuously, allowing CAC to increase or decrease mid-discharge if temperature shifts significantly.
Can the BQ2052SN-A515 operate without an external microcontroller?
Yes - the BQ2052SN-A515 supports standalone operation via its direct-drive LED interface. Using DISP input activation and PROG5-configured display mode (2/4/5 segments), it delivers visual state-of-charge indication without any host processor. The HDQ interface is optional and used only when register-level telemetry (e.g., CAC, VSB, TEMP) or dynamic reconfiguration (e.g., VTS updates) is required.
What is the function of the RBI pin on the BQ2052SN-A515, and when is it required?
The RBI (Register Backup Input) pin maintains register contents (e.g., DCR, CAC, FNAC) when VCC drops below 3.0 V. It accepts either a storage capacitor or an external backup source (e.g., bottom series cell). If used with a cell, an isolation diode is mandatory. RBI is required in applications where battery voltage may dip during load transients or end-of-life, ensuring gas gauge state integrity across power cycles without MCU intervention.
How is the full battery capacity (PFC) programmed on the BQ2052SN-A515?
PFC is set at power-up using the three-level states (high/float/low) of PROG1–PROG3 pins, selecting one of nine discrete mVh/count values (e.g., 327 mVh at 26112 counts). The target PFC is calculated as Battery Capacity (mAh) × Sense Resistor (Ω). For a 7000 mAh LiSO₂ cell with 0.05 Ω sense resistor: 7000 × 0.05 = 350 mVh → nearest option is 327 mVh (PROG1=L, PROG2=L, PROG3=Z), stored in PFC register (10h).
BQ2052SN-A515 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- HDQ
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2052SN-A515 FAQ
1.How can I place an order for BQ2052SN-A515 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2052SN-A515 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 BQ2052SN-A515 reliable?
The price and inventory of BQ2052SN-A515 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2052SN-A515 is usually 5 days.
3.What payment methods are accepted for BQ2052SN-A515?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2052SN-A515 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2052SN-A515?
BQ2052SN-A515 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2052SN-A515 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 BQ2052SN-A515?
For technical support, including BQ2052SN-A515 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2052SN-A515 requirements.
6.How does Aetrix verify that BQ2052SN-A515 is sourced from the original manufacturer or authorized distributors?
All BQ2052SN-A515 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 BQ2052SN-A515 meets industry standards.
7.What is the process for return or replacement of BQ2052SN-A515?
All BQ2052SN-A515 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2052SN-A515, 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 BQ2052SN-A515 part is unused and in its original packaging.
Return procedure for BQ2052SN-A515:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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