Monitoring Integrated Circuits for Mobile Devices Amplify LED Indicators of 3, 4, and 5 Voltages
The ABLIC S-82x9 series is a family of integrated circuits (ICs) designed for battery voltage monitoring and LED driving in portable electronics. These ICs are particularly useful for 3-5 segment LED battery status displays, making them popular choices for devices such as wireless earbuds, smartwatches, and handheld devices.
Key Features ------------
The S-82x9 series offers several key features, including integrated voltage monitoring, multi-segment LED driving, low current consumption, and no requirement for external resistors. These ICs support typical battery voltage ranges (e.g., 2.7V–5.5V), are packaged in space-saving options, and have a wide operating voltage range suitable for various Li-ion/Li-poly chemistries.
Voltage Monitoring ------------------
The S-82x9 series provides programmable comparator thresholds, high accuracy (±1%), and built-in hysteresis to prevent flickering of LEDs near threshold levels. Each LED segment corresponds to a different battery voltage range, making it easy for users to understand their device's battery status.
LED Driving -----------
These ICs drive each output pin directly to a single LED segment, with the number of pins matching the number of segments (3, 4, or 5). The S-82x9 series also includes built-in current limiting, eliminating the need for external resistors and ensuring consistent LED brightness. Some variants support blinking/flicker modes to draw attention to low-battery conditions.
Low Power Consumption ---------------------
The S-82x9 series consumes very little power, with typical supply current just a few µA. Some devices even include a mode where the LED driver is disabled to save power, with only voltage monitoring active.
Application Examples --------------------
The S-82x9 series is ideal for various applications, such as wireless earbuds, smartwatches, fitness trackers, and portable medical devices, where accurate and reliable battery information is critical.
Summary Table -------------
| Feature | Description | Typical Values | |--------------------------|---------------------------------------------------------|-------------------------------| | Segments | LED drives per IC | 3, 4, or 5 | | Input Voltage Range | Battery monitoring range | 2.7V–5.5V | | Accuracy | Comparator threshold accuracy | ±1% | | Quiescent Current | Operating current (typ.) | 2–10 µA | | Package | Common options | DFN, SNT-8A, VSON | | External Components | Required for basic operation | None (resistors) | | Hysteresis | Prevents flickering | Yes, built-in | | LED Current Regulation | Built-in current limiting | Yes |
Select Variants ---------------
The S-82x9 series offers three main variants: S-8239 (3 segments), S-8249 (4 segments), and S-8259 (5 segments). Designers can choose the appropriate series based on the level of resolution required for their project.
Why Use the S-82x9 Series? -------------------------
The S-82x9 series simplifies design by reducing the number of external components and PCB area, saves power through ultra-low current operation, and provides reliable battery status information. The ICs are flexible, with multiple segment options and package choices to fit various product requirements.
Where to Find More ------------------
For the latest datasheets, application notes, and specific electrical characteristics, visit ABLIC's official website or distributor resources. Always verify with the latest documentation, as features may evolve. If you need help selecting a specific part or have a detailed application requirement, provide your voltage range, LED count, and package preference—I can suggest the optimal S-82x9 variant for your project!
The S-82x9 series, offering technology for integrated voltage monitoring and multi-segment LED driving, finds extensive use in portable electronics, particularly wireless earbuds, smartwatches, and handheld devices. The technology in these ICs ensures no requirement for external resistors, provides programmable comparator thresholds, high accuracy, and built-in hysteresis for preventing LED flickering, all while consuming very little power.
