Overview
The BQ35100PWR from Texas Instruments is a highly configurable battery fuel gauge and end-of-service monitor designed for non-rechargeable (primary) lithium batteries. This device supports lithium thionyl chloride (Li-SOCl2) and lithium manganese dioxide (Li-MnO2) chemistry batteries without requiring a forced discharge of the battery. It utilizes patented TI gauging algorithms to provide accurate state-of-health (SOH) and end-of-service (EOS) data. The BQ35100PWR is optimized for ultra-low average power consumption, typically less than 2 µA, which can be achieved through host control via the GAUGE ENABLE (GE) pin. This feature extends battery runtime in various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW) | - |
| Pins | 14 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Input Voltage Range (BAT) | 0 to 5.0 | V |
| Input Voltage Range (SRP, SRN) | 0 to 0.125 | V |
| State-of-Health Average Current | 0.06 | µA |
| End-of-Service Average Current | 0.35 | µA |
| Coulomb Accumulation Average Current | 0.3 | µA |
| I2C Bus Frequency | 400 kHz | - |
| Junction-to-Ambient Thermal Resistance | 103.8 | °C/W |
Key Features
- Fuel gauge and battery diagnostics for predicting end-of-service or early battery failure.
- Supports lithium thionyl chloride (Li-SOCl2) and lithium manganese dioxide (Li-MnO2) chemistry batteries.
- Accurate voltage, temperature, current, and coulomb counter measurements to report battery health and service life.
- State-of-health (SOH) algorithm for Li-MnO2 and end-of-service (EOS) algorithm for Li-SOCl2.
- Coulomb accumulation (ACC) algorithm for all battery types.
- Ultra-low average power consumption to maximize battery runtime.
- Gauge enabled through host-controlled periodic updates.
- I2C host communication for battery parameter and status access.
- Configurable host interrupt and battery information data logging options.
- SHA-1 authentication to prevent counterfeit battery use.
Applications
- Smoke and gas leak detectors.
- Building automation and IoT, including sensor nodes.
- Asset tracking.
- Battery status reporting and diagnostics with early failure detection for flow meter systems.
- Extends battery runtime in applications such as smoke detectors, sensor nodes, and asset trackers.
Q & A
- What type of batteries does the BQ35100PWR support? The BQ35100PWR supports lithium thionyl chloride (Li-SOCl2) and lithium manganese dioxide (Li-MnO2) primary batteries.
- What is the typical power consumption of the BQ35100PWR? The typical power consumption is less than 2 µA, achieved through host control via the GAUGE ENABLE (GE) pin.
- How does the BQ35100PWR communicate with the host? The device communicates with the host through a 400-kHz I2C bus.
- What algorithms does the BQ35100PWR use for battery gauging? It uses state-of-health (SOH) algorithms for Li-MnO2 and end-of-service (EOS) algorithms for Li-SOCl2, along with a coulomb accumulation (ACC) algorithm for all battery types.
- Can the BQ35100PWR detect counterfeit batteries? Yes, it uses SHA-1 authentication to help prevent counterfeit battery use.
- What is the operating temperature range of the BQ35100PWR? The operating temperature range is -40°C to 85°C.
- How often does the BQ35100PWR need to be updated? A typical system may need to update the device once every 8 hours.
- What kind of package does the BQ35100PWR come in? The BQ35100PWR comes in a TSSOP (PW) package with 14 pins.
- Does the BQ35100PWR have configurable alerts? Yes, the ALERT signal can be configured to be triggered by various status conditions.
- Can the BQ35100PWR log battery information for diagnostics? Yes, it has options for battery information data logging for in-operation diagnostics and failure analysis.
