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Texas Instruments BQ2011SN-D118TR
- Part No.:
- BQ2011SN-D118TR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2011SN-D118TR.pdf
- Description:
- IC GAS GAUGE NIC CAD 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,838
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Product details
Overview
BQ2011SN-D118TR from Texas Instruments is a gas gauge IC designed for high-discharge-rate battery packs in power tools and portable industrial equipment. It measures charge/discharge current via a low-side sense resistor, compensates for temperature (−35°C to +85°C) and rate effects, estimates self-discharge using an internal timer and temperature sensor, and drives a 5-segment LED display directly. It operates from 3.0–6.5V and supports single-wire serial communication with external host processors.
For engineers reviewing the BQ2011SN-D118TR datasheet, BQ2011SN-D118TR pinout, BQ2011SN-D118TR application, or BQ2011SN-D118TR equivalent, key selection considerations include its 16-pin narrow SOIC package, ±2% integrated non-linearity error, 120µA standby current in self-discharge estimation mode, PFC-programmable full-count scaling (e.g., 6.5 mVh to 44.8 mVh), and support for both relative and absolute LED capacity display modes.
Technical Context
The BQ2011SN-D118TR implements coulomb counting with real-time temperature- and rate-compensated integration of voltage across a series sense resistor (SR–VSS). Its internal architecture includes dedicated registers for Nominal Available Charge (NAC), Last Measured Discharge (LMD), Discharge Count (DCR), and self-discharge compensation across eight temperature bands (e.g., NAC/320 per day below 10°C, doubling per 10°C step up to >70°C).
It uses a single-wire open-drain DQ interface with asynchronous return-to-one protocol (≤333 bits/sec), supports register backup via RBI input with external capacitor, and features dual display control: MODE pin selects relative vs. absolute LED mode, while DISP enables momentary 4-second display activation. Voltage thresholds are fixed: EDV = 0.90 V, MCV = 2.00 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–6.5 V - supports direct operation from 4-cell NiCd/NiMH packs (4.8 V nominal); REF output enables simple regulator extension to >4 cells. |
| Current Sensing Error | ±2% typical INL - ensures accurate coulomb counting over temperature and supply voltage variations; adds ±0.1%/°C and ±1%/V drift beyond 25°C/4.25V. |
| Standby Current | 120 µA typical - enables long-term self-discharge estimation without significant battery drain during idle periods. |
| Temperature Range | −35°C to +85°C - internal sensor provides 10°C-step resolution (TMPGG register) for adaptive compensation of charge/discharge efficiency and self-discharge rate. |
| LED Drive | Direct SEG1–SEG5 outputs - each sinks current sourced from MODE, VCC, or battery; supports 5-segment graphical capacity indication in absolute or relative mode. |
| Serial Interface | Single-wire DQ (open-drain) - asynchronous return-to-one protocol at ≤333 bits/sec; requires no external clock; compatible with low-cost microcontroller GPIO polling or pulse-width capture. |
| PFC Scaling | 6.5–44.8 mVh options - sets initial full-capacity reference (e.g., 1300 mAh × 0.005 Ω = 6.5 mVh); determines LMD update threshold and absolute display segment granularity. |
Pinout & Package
Package: 16-pin narrow SOIC (5.3 mm × 10.2 mm, 1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 3.0–6.5 V; powers internal circuitry and can source backup potential to RBI when >3.0 V. |
| REF | Voltage reference output | Provides stable reference for external micro-regulator to extend operation beyond 4-cell battery stacks. |
| NC | No-connect | Unbonded pin; must remain unconnected per layout guidelines. |
| DQ | Serial data I/O | Open-drain bidirectional pin; requires external pull-up; implements command-based read/write protocol with BREAK initiation. |
| RBI | Register backup input | Connects to storage capacitor to retain NAC, FULCNT, and LMD registers during VCC dips ≤3.0 V. |
| SB | Single-cell voltage monitor | High-impedance input for resistive divider; detects EDV (0.90 V) and MCV (2.00 V) thresholds across N-cell pack. |
| DISP | Display enable control | Low pulse activates LED display for 4 ±0.5 s; floating enables continuous display during charge (VSRO < −1 mV) or discharge (VSRO > 2 mV). |
| SR | Sense resistor low-side input | Monitors voltage drop across external sense resistor; VSR > VSS = discharge, VSR < VSS = charge; offset voltage (VOS) highly layout-sensitive. |
| MODE | Display mode select | Floating = relative mode (uses last full discharge as 100%); connected to LED anodes = absolute mode (uses PFC as fixed 100% reference). |
| SEG1–SEG5 | LED segment drivers | Open-drain outputs sinking current; each controls one LED segment; collectively indicate nominal available charge in 5-level graphical format. |
| PFC | Programmed Full Count select | 3-level input (H/Z/L) selecting one of six PFC values (e.g., 6.5–44.8 mVh); sampled only after reset to set initial capacity scale. |
| VSS | Negative battery terminal | System ground reference; SR and SB measurements referenced to this node; requires strict single-point ground layout to minimize VOS error. |
Key Features
| Feature | Design Value |
|---|---|
| Self-discharge compensation | Adaptive rate from NAC/320/day (<10°C) to NAC/2.5/day (>70°C), doubling per 10°C step - maintains accuracy across wide ambient and battery temperature ranges. |
| Charge/discharge rate compensation | Dynamic adjustment using VSR thresholds (VSR1–VSR4) and temperature bands - corrects NAC updates for efficiency loss at high currents and low temperatures. |
| LED capacity display | Hardware-driven 5-segment output with selectable relative/absolute mode - eliminates need for external display controller or firmware parsing of gas gauge data. |
| Single-wire serial interface | Asynchronous, low-pin-count DQ link with BREAK-initiated command protocol - simplifies subassembly testing and host integration without dedicated UART hardware. |
| Register backup with RBI | Capacitor-backed retention of NAC, LMD, and FULCNT during brownout - prevents capacity history loss during transient VCC drops common in power tool battery disconnect/reconnect cycles. |
Applications
| Power Tools Battery Packs | Industrial Portable Equipment |
|---|---|
Use Scenario: Cordless drill/driver battery packs requiring real-time state-of-charge feedback under intermittent 20–80 A discharge pulses. IC Role / Device Role / Timing Role: Gas gauge IC performing coulomb counting with temperature- and rate-compensated integration of sense resistor voltage to track remaining capacity. Use Value: Enables precise LED-based capacity indication despite high-current transients and thermal cycling, reducing user uncertainty during heavy-duty operation. | Use Scenario: Handheld test meters or ruggedized scanners powered by multi-cell NiCd/NiMH batteries operating in variable-temperature field environments. IC Role / Device Role / Timing Role: Battery management subsystem providing self-discharge estimation, end-of-discharge warning (EDV), and programmable full-count scaling for diverse battery chemistries and capacities. Use Value: Extends usable runtime by adapting capacity calculation to ambient temperature and aging effects, while maintaining low 120 µA standby drain during storage. |
| Medical Portable Devices | Emergency Lighting Systems |
Use Scenario: Battery-powered defibrillators or infusion pumps where reliable "low-battery" warnings must trigger before critical failure. IC Role / Device Role / Timing Role: Safety-critical gas gauge monitoring single-cell voltage (via SB pin) against fixed 0.90 V EDV threshold and flagging valid discharge completion for LMD learning. Use Value: Provides deterministic end-of-discharge detection independent of load profile, ensuring consistent warning timing across charge cycles and temperature gradients. | Use Scenario: Emergency exit sign battery packs subject to long-term float charging and infrequent discharge events. IC Role / Device Role / Timing Role: Long-duration self-discharge estimator using internal timer and temperature sensor to adjust NAC decrement rate across eight thermal bands. Use Value: Maintains accurate capacity tracking over months of standby, preventing premature "low battery" alerts or unexpected failure during emergency activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2013SN | Same 16-pin SOIC package and core architecture; adds EEPROM for permanent parameter storage and enhanced self-discharge modeling. | Supports longer-term capacity learning and factory calibration persistence; better suited for production battery packs requiring traceable configuration. | Select BQ2013SN when EEPROM-based parameter retention and extended self-discharge characterization are required; BQ2011SN-D118TR remains optimal for cost-sensitive, high-volume power tool designs. |
| BQ2019PW | TSSOP-24 package; integrates higher-precision ADC (±0.5% INL), wider VCC range (2.7–6.5 V), and additional safety registers (OVLD, CR). | Targeted at medical and aerospace applications requiring tighter measurement tolerance and enhanced fault reporting. | Choose BQ2019PW for designs demanding sub-1% current sensing accuracy or compliance with stringent safety standards; BQ2011SN-D118TR delivers proven performance for industrial portable tools at lower BOM cost. |
Compared with BQ2013SN and BQ2019PW, the BQ2011SN-D118TR offers the most cost-effective implementation for high-discharge-rate battery packs where EEPROM persistence or ultra-high-precision sensing is unnecessary - retaining identical LED drive, single-wire interface, and thermal compensation capabilities in a mature, widely deployed platform.
Availability
BQ2011SN-D118TR is available at Aetrix Electronics and suitable for power tools, industrial portable equipment, medical handheld devices, and emergency lighting systems requiring stable component supply and long-lifecycle support.
Supply support for BQ2011SN-D118TR 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 BQ2011SN-D118TR belongs to TI's legacy gas gauge IC family designed specifically for high-current, cost-sensitive battery pack applications in power tools and portable industrial equipment - emphasizing robust coulomb counting, minimal external components, and direct LED interfacing.
FAQ
What is the primary function of the BQ2011SN-D118TR in a battery pack?
The BQ2011SN-D118TR is a dedicated gas gauge IC that continuously monitors battery charge and discharge activity by integrating voltage across a low-side sense resistor. It computes nominal available charge (NAC) with temperature- and rate-based compensation, estimates self-discharge, and drives a 5-segment LED display - all within a single 16-pin SOIC package. Its design targets high-discharge-rate applications like cordless power tools.
How does the BQ2011SN-D118TR handle self-discharge estimation?
The BQ2011SN-D118TR estimates self-discharge using an internal timer and temperature sensor, applying a programmable base rate (e.g., NAC/80 per day at 20–30°C) that doubles per 10°C temperature increase above 20°C - ranging from NAC/320/day below 10°C to NAC/2.5/day above 70°C. This adaptive model ensures accurate capacity tracking during long-term storage across varying ambient conditions.
Can the BQ2011SN-D118TR operate directly from a 6-cell NiCd battery pack?
Yes - the BQ2011SN-D118TR accepts 3.0–6.5 V on VCC, making it compatible with 6-cell NiCd packs (nominal 7.2 V) only if regulated. Its REF pin provides a stable voltage reference to build a simple external regulator (e.g., with ZVNL110A MOSFET and resistor network) for safe operation above 4 cells. Direct connection to >4 cells without regulation risks exceeding the 6.5 V absolute maximum rating.
What is the role of the PFC pin on the BQ2011SN-D118TR?
The PFC (Programmed Full Count) pin on the BQ2011SN-D118TR is a 3-level input (H/Z/L) that selects one of six pre-defined full-capacity scaling factors (6.5–44.8 mVh). It sets the initial battery capacity reference used for absolute LED display mode and LMD initialization. The pin state is sampled only once after reset, enabling hardware-programmable configuration without firmware intervention.
Does the BQ2011SN-D118TR require external components for basic operation?
Yes - the BQ2011SN-D118TR requires at minimum: a low-value sense resistor (e.g., 0.005 Ω) between battery negative and VSS; 0.1 µF ceramic capacitor on VCC; storage capacitor on RBI for register backup; and optional RC filter on SR for high-dI/dt environments. For >4-cell operation, an external regulator using REF output is needed. No external crystal or precision references are required.
BQ2011SN-D118TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Nickel Cadmium
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2011SN-D118TR FAQ
1.How can I place an order for BQ2011SN-D118TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2011SN-D118TR 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 BQ2011SN-D118TR reliable?
The price and inventory of BQ2011SN-D118TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2011SN-D118TR is usually 5 days.
3.What payment methods are accepted for BQ2011SN-D118TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2011SN-D118TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2011SN-D118TR?
BQ2011SN-D118TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2011SN-D118TR 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 BQ2011SN-D118TR?
For technical support, including BQ2011SN-D118TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2011SN-D118TR requirements.
6.How does Aetrix verify that BQ2011SN-D118TR is sourced from the original manufacturer or authorized distributors?
All BQ2011SN-D118TR 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 BQ2011SN-D118TR meets industry standards.
7.What is the process for return or replacement of BQ2011SN-D118TR?
All BQ2011SN-D118TR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2011SN-D118TR, 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 BQ2011SN-D118TR part is unused and in its original packaging.
Return procedure for BQ2011SN-D118TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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