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STMicroelectronics STC3117IJT
- Part No.:
- STC3117IJT
- Manufacturer:
- STMicroelectronics
- Category:
- Battery Management
- Package:
- 9-WFBGA, CSPBGA
- Datasheet:
-
STC3117IJT.pdf
- Description:
- IC BATT MONITOR GAS GAUGE 9CSP
- Quantity:
- Payment:
- Shipping:
Inventory:461
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Product details
Overview
STC3117IJT from STMicroelectronics is a gas gauge IC with integrated battery charger control and OptimGauge™ algorithm for Li-ion/Li-polymer battery state-of-charge (SOC) and state-of-health (SOH) estimation in handheld devices. It features 40 µA operating current in voltage-only mode, ±0.5% battery voltage accuracy, and 1.49 × 1.594 mm 9-bump CSP package. Used in mobile phones and portable medical equipment for accurate runtime prediction and low-battery alarm signaling.
For engineers reviewing the STC3117IJT datasheet, STC3117IJT pinout, STC3117IJT application, or STC3117IJT equivalent, key selection criteria include mixed-mode SOC tracking accuracy, OCV-based SOH monitoring, I²C register-level configuration of alarm thresholds and battery parameters, and compatibility with 5–50 mΩ sense resistors in compact portable power systems.
Technical Context
The STC3117IJT implements a dual-path gas gauge architecture combining a 14-bit sigma-delta ADC-based Coulomb counter (active in mixed mode) and a voltage-mode algorithm that models battery OCV dynamics using programmable internal impedance and capacity parameters. Its 32.768 kHz internal time base enables precise timing for 250 ms voltage/temperature conversions and 500 ms current conversions.
Operating modes are software-selectable via the VMODE bit: mixed mode (VMODE=0) delivers highest SOC accuracy with continuous current integration and periodic voltage/temperature sampling; voltage mode (VMODE=1) disables current sensing and reduces current to 40 µA, relying solely on OCV curve matching with built-in hysteresis and relaxation timer–driven mode arbitration to prevent SOC drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7–4.5 V - supports single-cell Li-ion/Li-polymer battery input without external LDO |
| Operating Current | 40 µA (voltage mode), 80 µA (mixed mode) - enables multi-week standby in portable medical devices |
| Voltage Accuracy | ±0.5% over –20°C to +70°C - ensures <1% SOC error from OCV interpolation at end-of-discharge |
| Current Sensing LSB | 5.88 µV - resolves ~0.6 mA with 10 mΩ sense resistor, sufficient for 100–2000 mA portable loads |
| Temperature Range | –40°C to +85°C operating, –40°C to +125°C internal sensor range - matches battery thermal envelope in smartphones |
| I²C Interface | Standard-mode (≤400 kHz), open-drain SDA/SCL - interoperable with ARM Cortex-M and application processors' I²C controllers |
| Alarm Output | Open-drain ALM pin with programmable SOC/voltage thresholds - drives external LED or processor interrupt with no additional logic |
Pinout & Package
STC3117IJT uses a 1.49 × 1.594 × 0.4 mm flip-chip CSP (N5) package with 9 solder bumps arranged in a 3×3 grid (center bump omitted). The package includes coating ball printing for reliability in high-humidity portable environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ALM | Open-drain alarm output | Asserts low on low SOC (<1%), low voltage (<3.0 V), or battery fault; requires external pull-up |
| SDA | I²C bidirectional data line | Supports standard-mode I²C communication; shares bus with other peripherals |
| SCL | I²C clock input | Drives synchronous read/write access to 16+ configuration and status registers |
| GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor (1 µF) placed adjacent to VCC |
| CS | Current sense analog input | Accepts ±40 mV differential voltage across external sense resistor; 500 nA input bias |
| BATD | Battery detection input | Monitors battery presence via internal 1 MΩ pull-up; 1.46–1.76 V threshold with 0.1 V hysteresis |
| CD | Charge disable output | Active-high signal to inhibit external charger IC when battery fault detected |
| VCC | Power supply input | 2.7–4.5 V operation; UVLO at 2.6 V nominal with 100 mV hysteresis |
| VIN | Battery voltage sensing input | 0–4.5 V direct measurement path; 2.20 mV LSB resolution for OCV tracking |
Key Features
| Feature | Design Value |
|---|---|
| OptimGauge™ algorithm | Patented mixed-mode SOC estimation fusing Coulomb counting and OCV modeling to eliminate long-term drift |
| Programmable low-battery alarm | Configurable SOC threshold (0.5% steps) and voltage threshold (10 mV steps) via I²C registers |
| Battery swap detection | Robust OCV initialization at power-up plus BATD pin monitoring prevents false insertion errors |
| Internal temperature sensor | ±3°C accuracy over –40°C to +125°C; used for OCV curve compensation and SOH degradation tracking |
| End-of-charge detection | Identifies full charge via voltage plateau and current taper analysis, enabling safe charger termination |
Applications
| Smartphone Power Management | Digital Camera Battery Monitoring |
|---|---|
Use Scenario: Real-time battery level display and low-power shutdown in Android/iOS smartphones with dual-core APUs. IC Role / Device Role / Timing Role: Gas gauge IC performing mixed-mode SOC calculation every 4 s, updating UI via I²C, and asserting ALM to trigger OS-level suspend. Use Value: Delivers ±2% SOC accuracy across 500+ charge cycles, extending perceived battery life by preventing premature shutdown. | Use Scenario: Runtime estimation and flash-triggered power warning in DSLR/mirrorless cameras with removable Li-ion packs. IC Role / Device Role / Timing Role: Voltage-mode gas gauge during standby (4 s intervals), switching to mixed mode during burst capture to track rapid discharge. Use Value: Enables accurate "shots remaining" display with <1% error at 3.3 V, reducing user frustration from unexpected power loss. |
| Portable ECG Monitor | Wireless Headphone Charging Case |
Use Scenario: Continuous 72-hour ECG recording with Bluetooth telemetry in FDA-cleared wearable medical devices. IC Role / Device Role / Timing Role: Low-power voltage-mode monitoring (40 µA) during sleep, with ALM-driven wake-up on <5% SOC to save session data before shutdown. Use Value: Guarantees >99% data integrity across clinical sessions by eliminating unannounced power loss during analog acquisition. | Use Scenario: Dual-battery management in compact charging cases for true wireless stereo earbuds. IC Role / Device Role / Timing Role: Independent SOC tracking for main case battery and earbud batteries via shared VIN/CS paths and BATD sequencing. Use Value: Enables precise "case charge level" and "earbud %" reporting in companion app, improving user trust in battery indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | TI device with embedded chem-id learning; no internal temperature sensor; 1.6 × 1.6 mm DSBGA | Requires external thermistor for SOH; lacks battery swap protection logic | Prefer when chem-id auto-learning is prioritized over robust fault detection |
| MAX17048G+T | Maxim device using ModelGauge m3 algorithm; 1.5 × 1.5 mm WLP; 25 µA standby current | No charge inhibit (CD) output; relies on host MCU for charger control | Choose when system already implements charger enable/disable in firmware |
Compared with BQ27426YZFT and MAX17048G+T, the STC3117IJT uniquely integrates battery swap detection with hardware-level CD output and OptimGauge™'s automatic VM/CC arbitration-reducing host MCU intervention while maintaining <2% SOC error after 300 cycles in handheld thermal profiles.
Availability
STC3117IJT is available at Aetrix Electronics and suitable for smartphone power management, portable medical equipment, digital camera battery monitoring, and wireless headphone charging cases requiring stable component supply across extended production lifecycles.
Supply support for STC3117IJT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, analog ICs, and power management solutions for automotive, industrial, and consumer markets.
The STC3117IJT belongs to ST's battery management IC product line, designed specifically for high-accuracy, low-power fuel gauging in space-constrained portable electronics with demanding runtime predictability requirements.
FAQ
What is the function of the CD pin on the STC3117IJT?
The CD (Charge Disable) pin is an active-high open-drain output that signals external charger ICs to halt charging when battery faults-including missing battery, swapped battery, or overvoltage-are detected. It operates independently of host MCU control and asserts within 250 ms of fault identification, ensuring fail-safe charger inhibition without software latency.
How does the STC3117IJT handle battery aging and state-of-health (SOH) estimation?
The STC3117IJT estimates SOH by tracking long-term changes in battery impedance and capacity through repeated OCV measurements and Coulomb counter calibration during charge/discharge cycles. Its OptimGauge™ algorithm compares real-time voltage decay curves against factory-programmed reference OCV tables, flagging SOH degradation when capacity falls below 80% or internal resistance increases >30% from baseline.
Can the STC3117IJT operate without an external current sense resistor?
Yes-the STC3117IJT supports voltage-only mode (VMODE=1), disabling current sensing and reducing operating current to 40 µA. In this mode, SOC is estimated solely from OCV using the built-in OptimGauge™ voltage algorithm and programmable battery model parameters (VM_CNF), making it suitable for applications where size or cost constraints preclude a sense resistor.
What is the purpose of the BATD pin and how is it used in battery detection?
The BATD pin detects battery presence via an internal 1 MΩ pull-up and a 1.46–1.76 V threshold with 0.1 V hysteresis. When a battery is inserted, its voltage pulls BATD above threshold; removal drops it below. The STC3117IJT combines this with power-up OCV validation to distinguish between missing, swapped, and valid batteries-preventing erroneous SOC initialization and enabling safe hot-swap recovery.
STC3117IJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- OptimGauge™
- Package/Case:
- 9-WFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-CSP
STC3117IJT FAQ
1.How can I place an order for STC3117IJT through Aetrix?
Please submit a Request for Quotation (RFQ) for STC3117IJT 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 STC3117IJT reliable?
The price and inventory of STC3117IJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STC3117IJT is usually 5 days.
3.What payment methods are accepted for STC3117IJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STC3117IJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STC3117IJT?
STC3117IJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STC3117IJT 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 STC3117IJT?
For technical support, including STC3117IJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STC3117IJT requirements.
6.How does Aetrix verify that STC3117IJT is sourced from the original manufacturer or authorized distributors?
All STC3117IJT 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 STC3117IJT meets industry standards.
7.What is the process for return or replacement of STC3117IJT?
All STC3117IJT units undergo pre-shipment inspection (PSI). If there is an issue with STC3117IJT, 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 STC3117IJT part is unused and in its original packaging.
Return procedure for STC3117IJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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