#System monitor ii graph serial#
#System monitor ii graph Pc#

It is this linear temperature relationship that makes diodes suitable temperature sensors. V T is approximately 26mV at room temperature (298K) and scales linearly with Kelvin temperature. Where T is the diode junction temperature in Kelvin, q is the electron charge and k is Boltzmann’s constant. Where I D is the diode current, V D is the diode voltage, η is the ideality factor (typically close to 1.0) and I S (saturation current) is a process dependent parameter. Measuring the absolute temperature of a diode is possible due to the relationship between current, voltage and temperature described by the classic diode equation: 15-Bit ADC Measures Voltage and Current.Measures Voltage, Current and Temperature.

#System monitor ii graph serial#

The I 2C serial interface provides four addresses accommodating up to four LTC2990s on the same bus. Temperature sensors can be diodes or transistor sensors-remote sensor diodes are available as substrate diodes in large microprocessors and FPGAs. The LTC2990 measures ambient and remote temperature, plus voltage and current, so the measurements are easily combined. An integrated power and temperature monitoring system can use changes in power consumption to anticipate changes in temperature. Therefore it is important to monitor not only the temperature, but also the rate of temperature change in order to apply the correction before temperatures escalate to dangerous levels. Moreover, microprocessors and FPGAs are embedded in chassis with surrounding thermal mass, which take even longer to respond to a request for cooling. One problem with reactive cooling is that large HVAC systems have lag-they require time to reduce the ambient temperature. In telecommunication systems and other always-on applications, it is not acceptable to disable the system, so the only line of defense is to increase cooling. One line of defense against overheating is to increase fan speeds, while another is to temporarily disable the heat source.

#System monitor ii graph Pc#

Where it was once suitable to have a single chassis temperature monitor to deduce the health of the system, modern electronic systems produce many high power, point sources of heat that would go undetected with a simple chassis monitor.Įven PC processors feature dedicated secondary fans in order to keep specific die junction temperatures below an acceptable level. The resulting rise in power dissipation makes it increasingly difficult to monitor and control sources of heat.

The trend in µprocessors and FPGAs is toward packing more features into smaller ICs, run at ever-lower voltages. The limit on the complexity of large integrated circuits is dominated by how much power they can dissipate. I 2C System Monitor Combines Temperature, Voltage and Current Measurements for Single-IC System Monitoring