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STMicroelectronics STC3100IQT
- Part No.:
- STC3100IQT
- Manufacturer:
- STMicroelectronics
- Category:
- Battery Management
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
STC3100IQT.pdf
- Description:
- IC BATT MON LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,241
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Product details
Overview
STC3100IQT from STMicroelectronics is a single-cell Li-ion battery monitor IC with integrated Coulomb counter and gas gauge functionality. It performs simultaneous voltage (0–5 V range, ±0.5% accuracy), temperature (−40 to +85 °C, ±3 °C accuracy), and current sensing (±80 mV input, 12–14-bit ADC) using an external 10–50 mΩ sense resistor, supporting up to ±7300 mAh capacity measurement at 0.2 mAh resolution. It operates in portable consumer devices requiring precise state-of-charge estimation.
For engineers reviewing the STC3100IQT datasheet, STC3100IQT pinout, STC3100IQT application, or STC3100IQT equivalent, this device delivers verified gas gauge performance with I²C programmability, internal/external 32.768 kHz time base selection, 32-byte RAM for battery history storage, and an 8-byte unique device ID - all in a DFN8 3×3 mm package.
Technical Context
The STC3100IQT implements dual independent A/D conversion paths: a dedicated 12–14-bit signed ADC for current integration (gas gauge) and a separate 11-bit unsigned ADC for concurrent battery voltage and on-die temperature sampling. Its accumulator-based charge tracking uses a 28-bit register updated every 125–500 ms (resolution-dependent), with upper 16 bits accessible via I²C.
Gas gauge operation relies on either an internal oscillator biased by ROSC (200 kΩ) or an external 30–70 kHz clock for timebase accuracy; internal oscillator accuracy is ±2.5% over temperature and supply. The device maintains register contents down to 2.0 V VCC and enters ultra-low-power standby (2 µA) below UVLO threshold (2.6 V typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 2.7–5.5 V supply; supports direct connection to Li-ion cell (0–5 V VIN input) |
| Current Sensing | ±80 mV differential input; 11.77 µV LSB at 14-bit resolution enables ±2.5 A with 30 mΩ shunt |
| Charge Resolution | 0.2 mAh (upper 16 bits of 28-bit accumulator); full-scale ±7300 mAh with 32.768 kHz clock |
| ADC Accuracy | Gas gauge: ±1% gain error; voltage: ±0.5%; temperature: ±3 °C |
| Power Consumption | 100 µA active, 2 µA standby, 1 µA power-down - optimized for battery-powered longevity |
| I²C Interface | Standard/fast-mode (400 kbit/s); 7-bit address (default 0x70); MSB-first, ACK-handled protocol |
| Unique ID | 8-byte factory-programmed identifier (10h part ID + 48-bit random + 8-bit CRC) for pack authentication |
Pinout & Package
STC3100IQT is housed in a RoHS-compliant DFN8 3×3×1.0 mm package (pitch 0.5 mm) with wettable flanks, suitable for automated optical inspection and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IO0 | General-purpose I/O | Open-drain output / digital input; requires external pull-up; controlled via REG_CTRL bit IO0DATA |
| 2 ROSC | Oscillator bias terminal | Connects 200 kΩ resistor to set internal 32.768 kHz clock; or accepts external 30–70 kHz clock signal |
| 3 SDA | I²C data line | Bi-directional, open-drain; supports fast-mode (400 kbit/s); includes internal spike filtering |
| 4 SCL | I²C clock line | Input only; synchronizes all I²C transfers; no internal pull-up |
| 5 GND | Analog & digital ground | Single ground plane required; decoupling capacitor (1 µF) recommended near VCC pin |
| 6 CG | Current sense input | Differential analog input (CG+/CG−); accepts ±80 mV; 500 nA input bias enables low-error shunt sensing |
| 7 VCC | Power supply | 2.7–5.5 V input; retains RAM content down to 2.0 V; UVLO threshold at 2.6 V typical |
| 8 VIN | Battery voltage sense | Analog input for cell voltage monitoring (0–VCC range); sampled independently from gas gauge path |
Key Features
| Feature | Design Value |
|---|---|
| Programmable ADC resolution | Selectable 12/13/14-bit gas gauge ADC - trade off conversion time (125–500 ms) vs. resolution (11.77–47.08 µV LSB) |
| Concurrent sensing architecture | Independent ADCs for current, voltage, and temperature - no timing conflict or performance degradation between functions |
| On-chip calibration support | CG_CAL bit enables shorting CG inputs to measure and compensate internal ADC offset (±2–3 LSB) |
| Persistent memory | 32 bytes of RAM retained down to 2.0 V VCC - stores cycle count, aging data, and custom battery parameters |
| Factory-unique identification | 8-byte read-only ID with CRC-8 validation - enables secure battery pack authentication and firmware binding |
Applications
| Smartphone Battery Management | Bluetooth Headset Power Monitoring |
|---|---|
|
Use Scenario: Real-time state-of-charge (SoC) estimation during dynamic load changes in compact smartphones. IC Role / Device Role / Timing Role: Primary gas gauge IC performing continuous Coulomb counting and concurrent voltage/temperature sampling every 4 seconds. Use Value: Enables accurate battery remaining time prediction and low-battery warnings without host CPU intervention, extending perceived runtime by 5–8% via optimized discharge control. |
Use Scenario: Ultra-low-power SoC integration in Bluetooth earbuds with tight space constraints and strict thermal limits. IC Role / Device Role / Timing Role: Standalone battery monitor handling current integration and thermal derating decisions autonomously. Use Value: Reduces system-level power by eliminating periodic MCU wake-ups for battery reads; 2 µA standby current extends shelf life beyond 12 months. |
| Digital Camera Battery Pack | USB-C Portable Power Bank |
|
Use Scenario: High-accuracy capacity tracking across wide temperature ranges (−20 to +70 °C) in DSLR battery packs. IC Role / Device Role / Timing Role: Gas gauge with external RTC clock input for ±1% SoC accuracy under varying ambient conditions. Use Value: Eliminates "sudden shutdown" events by correlating voltage sag, temperature drift, and accumulated charge - improving user trust in remaining capacity display. |
Use Scenario: Multi-cell compatible power bank with single-cell Li-ion monitoring per module and firmware-updatable calibration. IC Role / Device Role / Timing Role: Module-level fuel gauge with I²C-accessible RAM for storing cycle history and manufacturer-specific safety thresholds. Use Value: Supports OEM branding and firmware differentiation via unique 8-byte ID; enables field calibration updates without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Higher integration: built-in chem ID, impedance track algorithm, and SHA-1 authentication; no external ROSC needed | Requires TI-specific bqStudio tools; lacks general-purpose I/O (IO0) and user RAM | Preferred when advanced learning algorithms and security are required; not drop-in due to different register map and I²C addressing |
| MAX17048G+T | ModelGauge™ m3 algorithm; 14-bit ADC; 1.8–4.5 V supply; no internal oscillator - requires external 32.768 kHz | Smaller footprint (WLP9); no unique ID or user RAM; lower quiescent current (0.8 µA) | Best for space-constrained wearables where algorithmic accuracy outweighs configurability and traceability needs |
Compared with BQ27426YZFT and MAX17048G+T, the STC3100IQT offers balanced flexibility: user-programmable ADC resolution, on-chip RAM for proprietary data, and a general-purpose I/O - making it optimal for cost-sensitive, firmware-customizable battery packs where moderate accuracy and design control are prioritized over AI-based modeling.
Availability
STC3100IQT is available at Aetrix Electronics and suitable for smartphone battery packs, Bluetooth audio accessories, digital camera power modules, and USB-C portable power banks requiring stable component supply and long-term lifecycle support.
Supply support for STC3100IQT 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, designing and manufacturing microcontrollers, analog ICs, MEMS, and power management solutions for industrial, automotive, and consumer markets.
The STC3100 belongs to ST's battery management IC product line, engineered specifically for high-accuracy, low-power fuel gauging in single-cell Li-ion systems - emphasizing configurability, on-chip diagnostics, and seamless integration into resource-constrained host platforms.
FAQ
What is the function of the ROSC pin on the STC3100IQT?
The ROSC pin serves a dual purpose: it accepts a 200 kΩ resistor to bias the internal 32.768 kHz oscillator, or it can be driven by an external 30–70 kHz clock signal for improved timebase accuracy. When used with an external clock, the SEL_EXT_CLK bit in REG_MODE must be set to '1'; the internal oscillator is automatically disabled. This pin has no pull-up or pull-down and must be externally terminated.
How does the STC3100IQT handle battery voltage and temperature measurements alongside Coulomb counting?
The STC3100IQT uses two physically separate A/D converters: one dedicated 12–14-bit signed ADC for current integration (gas gauge), and another 11-bit unsigned ADC multiplexed between VIN and the on-die temperature sensor. These operate concurrently - voltage and temperature conversions occur every 4 seconds (alternating), each taking 250 ms, without interrupting or delaying Coulomb counting cycles.
Can the STC3100IQT retain its RAM contents during deep discharge?
Yes - the STC3100IQT preserves all 32 bytes of RAM content down to VCC = 2.0 V, which corresponds to the POR threshold. Below 2.0 V, RAM is reset to default values. This ensures battery history, cycle count, and calibration data survive typical low-voltage shutdowns but are cleared only upon severe over-discharge (indicating potential cell damage), providing both reliability and diagnostic insight.
Is the STC3100IQT pin-compatible with the STC3100IST in MiniSO-8?
No - the STC3100IQT (DFN8 3×3 mm) and STC3100IST (MiniSO-8) share identical electrical functionality and register mapping but differ in pin numbering and physical layout. Pin 1 (IO0) and Pin 2 (ROSC) are swapped between packages, and the DFN8 lacks exposed thermal pad connections present in MiniSO-8. PCB redesign and layout verification are required for substitution.
STC3100IQT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
STC3100IQT FAQ
1.How can I place an order for STC3100IQT through Aetrix?
Please submit a Request for Quotation (RFQ) for STC3100IQT 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 STC3100IQT reliable?
The price and inventory of STC3100IQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STC3100IQT is usually 5 days.
3.What payment methods are accepted for STC3100IQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STC3100IQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STC3100IQT?
STC3100IQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STC3100IQT 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 STC3100IQT?
For technical support, including STC3100IQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STC3100IQT requirements.
6.How does Aetrix verify that STC3100IQT is sourced from the original manufacturer or authorized distributors?
All STC3100IQT 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 STC3100IQT meets industry standards.
7.What is the process for return or replacement of STC3100IQT?
All STC3100IQT units undergo pre-shipment inspection (PSI). If there is an issue with STC3100IQT, 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 STC3100IQT part is unused and in its original packaging.
Return procedure for STC3100IQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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