Environmental monitoring ICs deliver real-time power information

San Jose, Calif. — Summit Microelectronics has introduced the SMM151/2/3 product family of environmental monitoring ICs. The devices provide complete digital power supply monitoring and control functions, using I2C for communication. Their unique ability to measure system input current eliminates the efficiency and accuracy issues associated with monitoring output current, said Summit.

The monitoring semiconductors are suitable for high-reliability environments requiring real-time power information, high-accuracy monitoring and system protection to ensure high performance and zero downtime. Typical applications are in computing, data communications, and telecommunications. The real-time power supply information is particularly useful in applications that focus on high-efficiency (green) operation, said Summit.

The environmental monitors allow input current and differential output voltage monitoring via integrated, high-accuracy, 10-bit A/D conversion. This allows systems to obtain real-time power information and adjust operating modes for achieving maximum efficiency. Unlike other solutions that monitor output current, the SMM151/2/3 measure input current. This eliminates the side effects of the output sense resistor adding directly to the output impedance of the supply and resulting in higher voltage drops. Given the low duty-cycle operation in most modern high-reliability systems, input current measurement provides good accuracy while eliminating efficiency losses of output current sensing, Summit said.

The SMM151 and SMM152 devices provide output voltage margining with a range of 0.3 V to VDD (up to 5 V) or a wider range via an external resistor divider. The high-accuracy (1% or better) control of the output voltage ensures signal integrity of digital chips, even when low-accuracy dc/dc converters are used. All devices offer two general-purpose voltage comparators that can be used for detecting under- and over-voltage conditions. The SMM152 and SMM153 also integrate four general-purpose inputs/outputs, whose power-on state is determined by non-volatile memory settings. Two logic outputs are also available for notifying the system of error conditions and
of margining status.

The SMM151/2/3 operate directly from +2.7-V to +5.5-V input, however their current sense input can accept voltages from +4.0 V to +15 V, making them suitable for monitoring +12-V power input rails. The devices have an operating temperature range of +0°C to +70°C or -40°C to +85°C and are available in a 5 x 5-mm 28-pad QFN package that is lead-free and RoHS compliant. A SMM151EV development kit including companion evaluation board and GUI software is available.

Pricing: Available now in production quantities, the SMM151 and SMM152 devices are priced at $3.49 and $3.79 respectively, each in quantities of 1,000 (commercial temperature range). The SMM153 is priced at $2.79 in a quantity of 1,000 (commercial temperature range).
Product information: SMM151

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