SC2731
High-precision single-cell fuel gauge with impedance tracking and I2C interface for accurate battery monitoring
Product Overview
Description
The SC2731 is a high-precision fuel gauge for single-cell Li-ion/Li-polymer batteries. Using advanced impedance tracking technology, it provides accurate state-of-charge (SOC) and state-of-health (SOH) information throughout the battery's lifetime.
The device features a high-resolution ADC for voltage and current measurement, integrated temperature sensor, and sophisticated battery modeling algorithms. It compensates for battery aging and temperature effects to maintain accuracy.
Communication with the host processor is via standard I2C interface. The SC2731 provides comprehensive battery status information including SOC, remaining capacity, time-to-empty, and cycle count.
Product Series
SC
Primary Application
Smartphones
Key Features
- Impedance tracking technology
- High-precision voltage and current measurement
- Integrated temperature sensor
- Accurate SOC and SOH reporting
- Cycle counting
- I2C interface
- Ultra-low power consumption
- WLCSP package
Specifications
| Battery Type | Single-cell Li-ion/Li-polymer |
|---|---|
| Voltage Accuracy | ±5mV |
| Current Accuracy | ±1% |
| SOC Accuracy | 3-5% |
| Interface | I2C |
| Package | WLCSP-9 |
Applications
Smartphones
Electronic system design
Tablets
Electronic system design
Smart watches
Electronic system design
TWS earbuds
Electronic system design
Portable medical devices
Medical electronics
FAE Expert Insights
"The SC2731 is an excellent fuel gauge for single-cell applications. The impedance tracking technology provides significantly better accuracy than voltage-based methods, especially under load and as the battery ages. I've implemented this part in several smartphone and wearable designs with excellent results. The I2C interface is straightforward to implement, and the register map is well-organized. The automatic calibration feature reduces production calibration requirements. One consideration: the WLCSP package requires careful PCB layout and assembly. For best accuracy, use a high-quality current sense resistor (1% or better) and keep traces short. The low power consumption (typically <50μA) is excellent for battery-powered devices. Overall, this is a cost-effective fuel gauge with performance comparable to more expensive alternatives."
Accurate fuel gauge with impedance tracking for single-cell battery monitoring
— Sarah Liu, BeiLuo
Frequently Asked Questions
How does impedance tracking work?
Impedance tracking technology provides accurate fuel gauging: (1) Battery model - The fuel gauge maintains a model of battery impedance (resistance and capacitance) that changes with state-of-charge, temperature, and aging. (2) Real-time measurement - Continuously measures voltage, current, and temperature during charge and discharge. (3) Impedance update - Updates battery impedance model based on measured data, learning battery characteristics over time. (4) SOC calculation - Uses impedance model to calculate accurate SOC, compensating for voltage drop under load. (5) Aging compensation - Automatically adjusts for capacity fade and impedance increase as battery ages. This is more accurate than simple voltage-based methods because it accounts for the battery's dynamic behavior. The result is accurate SOC reporting even under varying load conditions and throughout battery lifetime.
Contact LiTong for impedance tracking technology details and implementation guidance.
What is the power consumption of SC2731?
The SC2731 has ultra-low power consumption suitable for battery-powered devices: (1) Active mode - Approximately 50-100μA during normal operation with periodic measurements. (2) Sleep mode - Less than 20μA when battery is in low-power state with reduced measurement frequency. (3) Shutdown mode - Less than 1μA when disabled. The low power consumption is achieved through efficient design and the ability to enter low-power states between measurements. The fuel gauge can be configured to take measurements at intervals (e.g., every 1-4 seconds) and sleep between measurements, further reducing average current. This low power consumption has minimal impact on battery life, making the SC2731 suitable for power-sensitive applications like wearables and IoT devices.
Contact LiTong for power consumption specifications and optimization.
What is the price of SC2731?
Pricing for SC2731 depends on order volume: (1) Sample pricing - Contact LiTong for sample pricing. (2) Volume pricing - Tiered pricing structure with discounts at 1K, 10K, 100K, and higher volumes. (3) Distribution pricing - As an authorized SouthChip distributor, LiTong offers competitive pricing with flexible terms. (4) Price stability - SouthChip maintains stable pricing with minimal fluctuations. (5) Alternative options - LiTong can suggest pin-compatible alternatives if cost optimization is needed. Contact LiTong sales for formal quotations with your forecast volumes and delivery requirements.
Contact LiTong sales for formal pricing quotations.
What is the lead time for SC2731?
Lead time for SC2731: (1) Stock items - 1-2 weeks for items in LiTong inventory. (2) Standard lead time - 8-10 weeks typical for non-stock items. (3) Large orders - Contact LiTong for scheduling and allocation. (4) Expedited delivery - Rush orders may be accommodated for urgent requirements. (5) Long-term agreements - Schedule agreements available for high-volume customers. LiTong maintains safety stock of popular SouthChip products to support quick-turn requirements. Contact LiTong with your delivery requirements for specific lead time commitments.
Contact LiTong for current lead times and delivery scheduling.
Does SC2731 support RoHS compliance?
Yes, SC2731 is fully RoHS compliant: (1) RoHS 6/6 compliant - Contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. (2) Halogen-free - Available in halogen-free versions upon request. (3) REACH compliant - Meets EU REACH regulations for chemical substances. (4) Conflict-free - Sourced from conflict-free suppliers. (5) Environmental certifications - Full material declarations available. (6) Green packaging - Compliant with environmental packaging requirements. SouthChip is committed to environmental compliance across all products. Compliance certificates and material declarations are available from LiTong upon request.
Contact LiTong for RoHS certificates and material declarations.