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Texas Instruments BQ2018TS-E1TR
- Part No.:
- BQ2018TS-E1TR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2018TS-E1TR.pdf
- Description:
- IC BAT MON MULT-CHEM 1-4C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,987
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Product details
Overview
BQ2018TS-E1TR from Texas Instruments is a dedicated battery charge/discharge counter IC for rechargeable battery packs, measuring voltage drop across a sense resistor with 12.5 µV resolution, featuring 1024-bit NVRAM (128 × 8), internal temperature sensor for self-discharge estimation, and single-wire HDQ serial interface - used in smart battery systems for state-of-charge calculation in portable medical devices and power tools.
For engineers reviewing the BQ2018TS-E1TR datasheet, BQ2018TS-E1TR pinout, BQ2018TS-E1TR application, or BQ2018TS-E1TR equivalent, key selection considerations include its ±200 mV differential current sense range, <80 µA operating current, REG output for external JFET-based microregulation, sleep mode (<10 µA), and 8-pin TSSOP package optimized for tight battery pack integration.
Technical Context
The BQ2018TS-E1TR implements a dynamically balanced voltage-to-frequency converter (VFC) architecture to integrate charge/discharge current over time, using SR1/SR2 differential inputs to detect polarity and magnitude of current flow. Its internal precision oscillator (±3.0% accuracy) eliminates need for external timing components.
It operates in two modes: full operation (<80 µA) when HDQ is high and |VSRO| > VWOE, and ultra-low-power sleep (<10 µA) when HDQ remains low >10 s and |VSRO| < VWOE. The WAKE output signals activity above programmable thresholds (0.549–3.84 mV), while RBI maintains register state during VCC dropout with <100 nA backup current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Sense Resolution | 12.5 µV per hour - enables precise coulomb counting for sub-mA battery currents |
| Differential Input Range | ±200 mV - supports low-value sense resistors (e.g., 10–50 mΩ) without signal saturation |
| Operating Current | <80 µA - allows direct operation from 3–4 NiCd/NiMH cells or single Li-ion cell |
| Sleep Current | <10 µA - extends battery shelf life during storage with minimal self-discharge impact |
| NVRAM Size | 1024 bits (128 × 8) - stores capacity data, chemistry ID, serial number, and offset calibration values |
| Temperature Sensing | Internal sensor with ±2°C typical accuracy at 25°C - enables temperature-compensated self-discharge rate doubling every 10°C above 25°C |
| REG Output | 3.7 V nominal (±200 mV) - drives external n-channel JFET for low-cost regulated VCC supply |
| Interface | Single-wire HDQ (open-drain) - reduces pack wiring count and simplifies host communication |
Pinout & Package
Package: 8-pin TSSOP (TS suffix) - footprint compatible with narrow SOIC, designed for mechanical integration between A-size cylindrical cells or within prismatic cell width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REG | Regulator output | Drives external n-JFET to generate stable 3.7 V supply; enables cost-effective microregulation without LDO |
| VCC | Supply voltage input | Accepts 2.8–5.5 V directly or 3.7 V ±200 mV when REG-regulated; powers all internal circuitry |
| VSS | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to pack ground |
| HDQ | Data I/O (open-drain) | Single-wire serial interface; requires external pull-up; controls sleep/wake via logic level duration |
| WAKE | Activity indicator output | Open-drain output asserts low when |VSRO| exceeds programmed WOE threshold (0.549–3.84 mV) |
| SR1 / SR2 | Differential current sense inputs | SR1 connects to battery negative; SR2 to pack ground; polarity determines charge (+) vs. discharge (−) counting |
| RBI | Register backup input | Maintains NVRAM contents during VCC dropout (e.g., shorted battery); draws <100 nA when active |
Key Features
| Feature | Design Value |
|---|---|
| Offset calibration register (OFR) | 8-bit two's complement storage for ±500 µV offset cancellation - improves current measurement accuracy without hardware trimming |
| Self-discharge estimation | SCR increments at 1 count/hour @ 25°C, doubling every +10°C up to 60°C - enables accurate SoH prediction during storage |
| Dual-mode power management | Automatic transition between <80 µA active and <10 µA sleep based on HDQ state and current activity - minimizes quiescent drain |
| Internal temperature sensor | 8-step digital output (0–7h) covering <0°C to >60°C with ±2°C typical accuracy - provides thermal context for SoC algorithms |
| Counter rollover handling | DTC/CTC rollover sets STD/STC flag and reduces count rate to 1/256 - prevents overflow loss while signaling maintenance need |
Applications
| Smart Battery Packs | Portable Medical Devices |
|---|---|
|
Use Scenario: Integrated into lithium-ion or NiMH battery packs for laptops, power tools, and handheld scanners requiring accurate runtime estimation. IC Role / Device Role / Timing Role: Charge/discharge counter providing raw coulomb counts (DCR/CCR) and time-in-state (DTC/CTC) to host MCU for real-time SoC calculation. Use Value: Enables firmware-level fuel gauging without external ADC or timer peripherals - reduces BOM cost and PCB area in space-constrained packs. |
Use Scenario: Used in portable infusion pumps and defibrillators where battery runtime predictability directly impacts patient safety. IC Role / Device Role / Timing Role: Monitors cumulative charge transfer and self-discharge drift under varying ambient temperatures to maintain SoC accuracy over multi-week deployments. Use Value: Internal temperature compensation and NVRAM retention via RBI ensure reliable SoC reporting even after extended shelf storage or intermittent use. |
| Industrial Handheld Terminals | Two-Way Radios |
|
Use Scenario: Embedded in ruggedized barcode scanners and RFID readers deployed in warehouses with frequent charge/discharge cycles. IC Role / Device Role / Timing Role: Tracks charge/discharge history and time-in-use to support battery health analytics and predictive replacement alerts. Use Value: 1024-bit NVRAM stores usage logs, cycle counts, and calibration offsets - enables field-service diagnostics without host system dependency. |
Use Scenario: Deployed in professional-grade PMR radios requiring precise battery status feedback during mission-critical communications. IC Role / Device Role / Timing Role: Provides wake-up signaling (WAKE pin) and low-power monitoring to extend standby time while maintaining readiness for rapid transmission bursts. Use Value: Sleep mode current <10 µA preserves battery charge during idle periods; HDQ-driven wake ensures immediate responsiveness upon user activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2019TS-E1TR | Same pinout and register map; adds EEPROM write-protection bit and improved offset drift spec (±300 µV max) | Preferred for new designs requiring enhanced long-term calibration stability and secure NVRAM writes | Select BQ2019TS-E1TR if firmware requires write-lock capability or tighter offset drift control over temperature and time |
| BQ2023DBTR | 14-pin TSSOP; integrates 2.5 V LDO regulator and adds SMBus interface alongside HDQ; higher ICC (120 µA) | Suitable for systems needing dual-interface flexibility or regulated auxiliary supply for companion ICs | Choose BQ2023DBTR only when SMBus compatibility or integrated LDO is required - not a drop-in replacement due to pin count and package mismatch |
Compared with BQ2018TS-E1TR, the BQ2019TS-E1TR offers incremental calibration robustness in identical form factor, while the BQ2023DBTR trades pin-count and power efficiency for interface versatility and integrated regulation - neither is pin-compatible, but both serve adjacent fuel-gauge design requirements.
Availability
BQ2018TS-E1TR is available at Aetrix Electronics and suitable for smart battery packs, portable medical devices, and industrial handheld terminals requiring stable component supply and long-lifecycle support.
Supply support for BQ2018TS-E1TR 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 decades of experience in battery management solutions.
The BQ2018TS-E1TR belongs to TI's Power Minder™ family of battery fuel gauge ICs, designed specifically for cost-sensitive, space-constrained rechargeable battery packs requiring high-accuracy coulomb counting without external timing or regulation components.
FAQ
What is the primary function of the BQ2018TS-E1TR?
The BQ2018TS-E1TR is a dedicated battery charge/discharge counter IC that accumulates coulomb counts by integrating voltage drop across a sense resistor. It provides raw DCR, CCR, SCR, DTC, and CTC register values to an external host controller for state-of-charge calculation. The BQ2018TS-E1TR does not perform fuel gauging autonomously - it relies on host firmware to interpret and apply the counters.
How does the BQ2018TS-E1TR achieve high current measurement resolution?
The BQ2018TS-E1TR achieves 12.5 µV resolution through a precision differential input stage and internal offset calibration (OFR register), allowing accurate detection of small voltage drops across low-value sense resistors (e.g., 10–50 mΩ). Its ±500 µV maximum offset is digitally canceled using the 8-bit two's complement OFR value stored during pack assembly.
Can the BQ2018TS-E1TR operate without an external regulator?
Yes - the BQ2018TS-E1TR can operate directly from 2.8 V to 5.5 V on VCC, such as from three or four NiCd/NiMH cells or a single Li-ion cell. Its REG pin is optional: when used, it drives an external n-JFET to create a low-cost 3.7 V regulated supply; when unused, VCC must remain within the specified DC operating range.
What role does the RBI pin play in BQ2018TS-E1TR operation?
The RBI pin maintains the integrity of the BQ2018TS-E1TR's 1024-bit NVRAM during VCC dropout events - for example, when the battery is shorted or deeply discharged. When VCC falls below 2.4 V, RBI supplies backup current (<100 nA) from an external capacitor or series cell, preserving register contents including calibration data and accumulated counts.
How does temperature affect self-discharge counting in the BQ2018TS-E1TR?
The BQ2018TS-E1TR's internal temperature sensor adjusts the self-discharge count rate (SCR): it increments at 1 count/hour at 25°C, doubles every +10°C up to 60°C (reaching 16 counts/hour), and halves every −10°C down to 0°C (as low as 1 count/8 hours). This enables accurate SoH estimation during storage across realistic ambient conditions.
BQ2018TS-E1TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Power Minder™
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 4
- Fault Protection:
- -
- Interface:
- HDQ
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
BQ2018TS-E1TR FAQ
1.How can I place an order for BQ2018TS-E1TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2018TS-E1TR 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 BQ2018TS-E1TR reliable?
The price and inventory of BQ2018TS-E1TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2018TS-E1TR is usually 5 days.
3.What payment methods are accepted for BQ2018TS-E1TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2018TS-E1TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2018TS-E1TR?
BQ2018TS-E1TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2018TS-E1TR 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 BQ2018TS-E1TR?
For technical support, including BQ2018TS-E1TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2018TS-E1TR requirements.
6.How does Aetrix verify that BQ2018TS-E1TR is sourced from the original manufacturer or authorized distributors?
All BQ2018TS-E1TR 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 BQ2018TS-E1TR meets industry standards.
7.What is the process for return or replacement of BQ2018TS-E1TR?
All BQ2018TS-E1TR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2018TS-E1TR, 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 BQ2018TS-E1TR part is unused and in its original packaging.
Return procedure for BQ2018TS-E1TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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