LM75A device highlight
LM75A Digital Temperature Sensor & Thermal Watchdog
The LM75A is used in general applications such as personal computers, system thermal management, electronics equipment, and industrial controllers. It is ideally suited for portable products.
The LM75A is a temperature-to-digital converter using an on-chip band-gap temperature sensor and Sigma-Delta A-to-D conversion technique. It contains a number of data registers:
A bus master may be a personal computer or a microcontroller. The bus master can query the LM75A at any time to read temperature. Both the over-temperature threshold (TOS) and the hysteresis temperature (THYS) contents are stored in the TOS and THYS registers which are programmed via the host. Three pins (AO, A1, A3) are used to select the address; thus, eight LM75A may be used on single I2C bus. The temperature register always stores an 11-bit 2's complement data giving a temperature resolution of 0.125oC. The device is powered up in normal operation mode with the OS in comparator mode, over-temperature threshold at 80oC and hysteresis temperature at 75oC. The LM75A can be configured for different conditions. It can be set in normal mode to periodically monitor the ambient temperature or in shutdown mode to minimize power consumption.
The LM75A is a pin-by-pin replacement for the industry standard National LM75. However, the LM75 has better specification than most competitive devices. The LM75A operates with equal or better temperature accuracy over the operating temperature range of -55 to +125oC and supply voltage range of 2.8 to 5.5V than the competitive devices. With a temperature resolution of 0.125oC, it far exceeds all competitive "LM75" devices, which specify 0.5oC.
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