Temperature sensors report data over 1.8-V SMBus and I2C interface

August 14, 2013 // By Paul Buckley
Microchip Technology has introduced a new six-member family of temperature sensor ICs called the EMC118X.

The company claims the devices make up the first family of temperature sensors to be equipped with 1.8 V SMBus and I 2C communications, which is required for interfacing to the latest generation of smartphone, tablet and PC chipsets.  Additionally, the integrated low-voltage I/O support reduces cost and board space because it is accomplished without an external voltage level shifter.  These are also, the company says, the first temperature sensors to use an advanced sample-frequency-hopping filter, which enables temperature-monitoring traces of up to 20 cm in noisy environments with accurate readings.  The EMC118X family serves a broad range of applications in the mobile, commercial and embedded computing markets, by combining the above features with options for dual, triple and quad temperature monitoring, along with hardwired system-shutdown settings that cannot be overridden by software.

The latest generation of smartphone, tablet and PC chipsets have a 1.8-V upper voltage limit for I/O signals.  There are few temperature sensors with 1.8V I 2C/SMBus interfaces, and the EMC118X is the first family to provide this capability, along with a flexible set of integrated feature options.  It is also difficult to extend analogue traces near noisy components, such as DC/DC converters and backlight inverters.  The EMC118X family employs frequency-hopping on the sampling frequency, which avoids the injection of coherent noise and enables traces of up to 20 cm while maintaining accurate temperature readings.
Pricing begins at $0.51 (5,000). The EMC1182 is offered in 8-pin DFN and TDFN packages.  The EMC1183, EMC1184, EMC1187 and EMC1188 are all available in a 10-pin DFN package.  The EMC1186 is offered in an 8-pin TDFN package.
Microchip also introduced the EMC1182 Evaluation Board (ADM00516), $29.99, from microchipDIRECT or distributors.
Microchip; www.microchip.com/get/7TEL