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The STC3115 includes the hardware functions required to implement a low-cost gas gauge for battery monitoring. The STC3115 uses current sensing, Coulomb counting and accurate measurements of the battery voltage to estimate the state-of-charge (SOC) of the battery. An internal temperature sensor simplifies implementation of temperature compensation.
An alarm output signals a low SOC condition and can also indicate low battery voltage. The alarm threshold levels are programmable.
The STC3115 offers advanced features to ensure high performance gas gauging in all application conditions.Key Features
- OptimGaugeâ„¢ algorithm
- 0.25% accuracy battery voltage monitoring
- Coulomb counter and voltage-mode gas gauge operations
- Robust initial open-circuit-voltage (OCV) measurement at power-up
- Programmable low battery alarm
- Internal temperature sensor
- Battery swap detection
- Low power: 45 μA in power-saving mode, 2 μA max. in standby mode
- Micro-sized packages:
- 1.4 x 2.0 mm 10-bump CSP package
- 2.0 x 3.0 mm DFN10 package
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Picture Part number Manufacturer Description 
STEVAL-ISB014V2 -- Battery monitoring with alarm output for gas gauge applications based on the STC3115 
STEVAL-WESU1 ST Wearable sensor unit reference design for fast time to market Part NumberBattery monitoring with alarm output for gas gauge applications based on the STC3115
Wearable sensor unit reference design for fast time to market
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| STC3115AIJT |
Active
|
Chip Scale Package 0.4mm pitch | Industrial | Ecopack3 | |
| STC3115AIQT |
Active
|
UFDFPN 2X3 10L | Industrial | Ecopack3 | |
| STC3115IJT |
Active
|
Chip Scale Package 0.4mm pitch | Industrial | Ecopack3 | |
| STC3115IQT |
Active
|
UFDFPN 2X3 10L | Industrial | Ecopack3 |
|
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| STC3115AIQT | 6 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | UFDFPN 2X3 10L | -40 | 85 | PHILIPPINES | 1.26 / 1k | |
| STC3115AIJT | 6 distributors |
Active
|
EAR99 | NEC | Tape And Reel | Chip Scale Package 0.4mm pitch | -40 | 85 | FRANCE | 1.176 / 1k | ||
| STC3115IJT | 4 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | Chip Scale Package 0.4mm pitch | -40 | 85 | CHINA | ||
| STC3115IQT | 5 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | UFDFPN 2X3 10L | -40 | 85 | PHILIPPINES | 1.26 / 1k | |
Marketing Status
ActiveECCN (US)
EAR99Budgetary Price (US$)*/Qty
1.176 / 1k(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors
