Thermal Sensing IC
The BU9817FV incorporates wide temperature range, low power A/D converter with on-board reference and two-wire I2C bus interface, simplifying thermal sensing circuitry by minimizing the need for external components normally required to manage multiple temperature sensors. It can be used to turn on a secondary fan or shut down components such as the CPU, digital signal processor, graphics processor, and motor driver for a hard or floppy drive when they exceed a temperature threshold. A self-monitoring mode provides automatic alerts when temperatures exceed a pre-programmed threshold, while on-board over-voltage protection eliminates the possibility of component and circuit damage from power surges and voltage spikes. The host system can set its functional parameters and retrieve collected temperature and voltage information through the I2C bus interface.
The BU9817FV integrates a 4-channel, 8-bit A-to-D converter, I2C serial bus interface and overvoltage detector into a single, miniature SMT device that operates at temperatures from 15°C to 75°C. The BU9817FV incorporates two special power saving modes, making it ideally suited for low-power and battery driven applications. The device operates from 3 V to 5.5 V supplies with a current consumption of 0.75 mA or 1 uA when in shutdown mode. Supplied in a miniature SSOP 14-pin plastic package, the BU9817FV has dimensions of 5.0 × 4.4 × 1.2 mm.