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EMC1033-ACZT-TR Datasheet(PDF) 9 Page - SMSC Corporation |
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EMC1033-ACZT-TR Datasheet(HTML) 9 Page - SMSC Corporation |
9 / 25 page 1°C Triple SMBus Sensor with Resistance Error Correction Datasheet SMSC EMC1033 9 Revision 1.1 (01-19-07) DATASHEET Chapter 4 Product Description The EMC1033 is an SMBus sensor that can monitor internal temperature and one or two remote diode temperatures. The sensor is typically used with an SMBus host such as an SMSC SIO device or an SMSC fan control chip. Thermal management is performed in cooperation with the host device. The host reads the temperature data from the EMC1033 and takes appropriate action such as controlling fan speed or processor clock frequency. The EMC1033 has programmable temperature limit registers that define a safe operating window. After the host has configured the temperature limits, the EMC1033 can perform as a free-running independent watchdog to warn the host of temperature hot spots without requiring the host to poll the device. Figure 4.1 System Overview Two separate temperature zones are monitored using only two pins on the EMC1033. This is accomplished using two anti-parallel diodes as shown in Figure 4.1. This technique maintains high accuracy while minimizing pin count and reducing board routing complexity. The anti-parallel diode architecture performs very well with diode connected transistors. It is not compatible with substrate transistors (sometimes called thermal diodes or on-chip sense junctions). See the complete list of temperature sensor products available from SMSC for devices that can measure two or more remote zones including substrate transistors. The connections for the two discrete transistors are shown in Figure 4.2 Figure 4.2 Anti-parallel Diodes The EMC1033 has two basic modes of operation: Run Mode: In this mode, the EMC1033 continuously converts temperature data and updates its registers. The rate of temperature conversion is configured as shown in Section 4.12, "Conversion Rate Register," on page 17. Standby Mode: In this mode, the EMC1033 is placed in standby to conserve power as described in Section 4.7, "Standby Mode," on page 13. ADDR/THERM ALERT/THERM2 Host Fan Driver SMDATA SMCLK SMBus Interface EMC1033 DP1/DN2 DN1/DP2 Internal Diode Typical remote discrete PNP transistor i.e. 2N3906 Typical remote discrete NPN transistor i.e. 2N3904 to DP1/DN2 to DN1/DP2 to DP1/DN2 to DN1/DP2 |
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