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EMC1204-ACZL-TR Datasheet(PDF) 6 Page - SMSC Corporation |
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EMC1204-ACZL-TR Datasheet(HTML) 6 Page - SMSC Corporation |
6 / 10 page Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet Revision 1.1 (06-11-08) 6 SMSC EMC1203/EMC1204 DATASHEET Chapter 3 Product Description The EMC1203 and EMC1204 are temperature sensors with a proprietary single wire SMSC BudgetBus™ Sensor Interface. Temperature information is communicated to a host device via the serial bus. All intelligence regarding the interpretation of temperature resides in the host. Figure 3.1, "System Overview" shows a typical system overview: Figure 3.1 System Overview In cooperation with the host device, thermal management can be performed as shown in Figure 3.1. Thermal management consists of the host acquiring the temperature data from the EMC1203 and EMC1204 controlling the speed of one or more fans. The host has the ability to compare measured temperature levels to preset limits and take the appropriate action when values are found to be out of limit. The EMC1203 and the DP1/DN1 port of the EMC1204 are compatible with CPU substrate diodes. Two separate temperature zones are monitored using only two pins on the EMC1204. This is accomplished using two anti-parallel diodes as shown on the pins DP2/DN3 and DN2/DP3 in Figure 3.1. 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). 3.1 Temperature Monitors Thermal diode temperature measurements are based on the change in forward bias voltage ( ΔV BE) of a diode when operated at two different currents: The change in ΔV BE voltage is proportional to absolute temperature T. where: k = Boltzmann’s constant T = absolute temperature in Kelvin q = electron charge η = diode ideality factor EMC1203/ EMC1204 Host (KBC1100) BBUS Interface DP1 DN1 DP2/DN3 DN2/DP3 BBUS ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ = − = Δ LOW HIGH LOW BE HIGH BE BE I I q kT V V V ln _ _ η |
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