The Industry's Smallest Thermostat Output Temperature Sensor ICs
with the Lowest Current Consumption

August 29, 2008 – ROHM formally introduces a lineup of ultra-compact, low current consumption thermostat output temperature sensor ICs optimized for temperature monitoring and overheating protection in compact devices such as mobile phones, gaming equipment, digital cameras, portable audio, and notebook PCs. The BDJ□□□1HFV series integrates a temperature detection element, constant current circuit, and high-precision reference power source into a single chip. The output mode is Open Drain/Active High, and high precision temperature detection (±2.5ºC) is possible without the need for complex circuit designs.

Increasing performance and greater miniaturization of portable electronic devices demand components that are not only compact, but deliver low current operation for less heat generation. ROHM responds to these needs by offering the BDJ□□□1HFV in an ultra-compact HVSOF5 package and decreasing current consumption by 50%, to a mere 7.5µA. In addition to a power down function, an analog temperature output terminal is included for broad compatibility.

• Main features of the BDJ□□□1HFV

1. Ultra-compact HVSOF5 package (1.6×1.6×0.6mm)
   approximately 70% smaller than conventional SSOP5 package types (2.9×2.8×1.25mm)
2. 50% less current consumption (7.5µA) than conventional products
3. Built-in power down function (0.3µA current consumption, 1.8V power down terminal voltage)
4. High precision thermostat (±2.5ºC, 5ºC increments from 55ºC to 90ºC)
5. Open Drain/Active High output mode
6. Detection temperature hysteresis (10ºC)
7. High accuracy analog output: ±2.5ºC (Ta=-30ºC to 100ºC, Vdd=2.8V typ.)
8. High analog output temperature sensitivity: -8.2mV/ºC

Sample Price: 100 yen
Availability: September (Samples), December (Mass Production)

Please note that the detection temperature is designated in the part number
(e.g. 85ºC → BDJ0851HFV, 75ºC → BDJ0751HFV.

New Product Bulletin for Thermostat Output Temperature Sensor ICs(PDF:248KB)

• Glossary

• Thermostat
  A function that automatically regulates the temperature by opening/closing an electrical circuit based on temperature. Two main types of thermostats exist: bimetal and electronic.
• Reference Voltage Source
  A voltage source that will be inverted via comparator. High precision is required.
• Open Drain Output
  An output mode of the MOSFET in the temperature sensor IC whereby the Nch MOS Drain terminal is used for output. It is commonly used when it is necessary to ensure sufficient current margin in the next circuit when the supply voltage of the thermostat output temperature sensor IC and the next circuit differs.
• Active High Output
  Refers to an output method where the thermostat (switch) output changes from L (Open Drain transistor ON) to H (Open Drain transistor OFF) once the detection temperature is reached.
• Hysteresis Temperature (the difference between the detection temperature and reset temperature)
  For example, in an Open Drain/Active High system with a detection temperature of 80ºC, if the detection hysteresis temperature is 10ºC, once the detection temperature of 80ºC is reached, the thermostat output will change from L (Open Drain transistor ON) to H (Open Drain transistor OFF). If the temperature falls to 70ºC (the reset temperature), the thermostat output will revert back to L (Open Drain transistor ON).

	Temperature Sensor IC Series