1% accurate programmable voltage supervisor

April 25, 2014 // By Graham Prophet
LTC2933 is a programmable voltage supervisor with built-in EEPROM for simultaneous, accurate monitoring of up to six voltage rails from 0.2V to 13.9V. Requiring no external resistors to set thresholds, the LTC2933 provides an I²C/SMBus interface to access onboard EEPROM.

Users can quickly configure the device and review faults or violation history through the LTpowerPlay graphical user interface. Six voltage monitoring channels, including one high-voltage channel, offer a choice of input ranges, and 1% guaranteed threshold accuracy over temperature. The LTC2933’s tight 1% power supply threshold accuracy reduces the required system voltage margin, compared to less accurate voltage supervisors.

Each channel of the LTC2933 can be programmed to one of 256 available overvoltage (OV) and undervoltage (UV) fault or warning thresholds, which can be disabled for margining purposes. This highly configurable device offers two general purpose inputs (GPIs) that can be configured as manual reset, UV disable, margin enable, or auxiliary comparator inputs. Three general purpose inputs/outputs (GPIOs) can be mapped to respond to any combination of these user-defined inputs, power supply faults, as /ALERT outputs per the SMBus standard, or as interrupts to provide maximum design flexibility. The output type (open-drain or weak pull-up), polarity, and delay-on-release response time can be individually selected for all GPIO pins. A well-regulated 3.3V output can be used to monitor negative supplies. Three pin-selectable I²C addresses are also available.

The LTC2933 is designed to increase system reliability in applications including network servers, data storage, telecommunications equipment, industrial control, and high availability computer systems. The LTC2933 uses an EEPROM to store configuration data that has been tested over temperature and guarantees at least 10 years of data retention.

The LTC2933 is available in commercial and industrial versions, supporting operating temperature ranges from 0°C to 70°C and -40°C to 85°C, respectively. In a 16-pin 5 x 4 mm DFN or narrow 16-lead SSOP package, pricing starts at $4.85 (1,000).

Linear Technology; www.linear.com/product/LTC2933