EVB-EMC1043/1053/1063 User Manual
Revision 1.1 (12-14-06) SMSC EMC1043/1053/1063
2
1 Overview
The EMC1043/1053/1063 are SMBus temperature sensing ICs with 1 internal and 2 external sensors
in an 8 pin MSOP package. These 3 ICs are targeted at different applications as described in Table 1.1.
This evaluation board (EVB) has 2N3904 diode-connected transistors installed on the PCB for external
diodes 1 and 2. The Beta Compensation function is designed for CPU substrate diodes and is not
compatible with diode-connected transistors such as the 2N3904. For this reason, the EMC1043
default settings are over-ridden by the Register Manager’s initialization code so that Beta
Compensation is disabled.
If your evaluation process requires connecting the EVB to the thermal diodes on Intel or AMD CPUs,
you can modify the PCB by removing the 2N3904s and installing the headers (P2 and P3) for
connection to external diodes over cables. Alternately, you can order the EVB-EMC1043C/1063C,
which is configured with headers for CPU connection. Refer to the schematic, SCH-7040_B0.pdf for
details on EVB circuit options.
Resistance Error Correction can eliminate the affect of series resistance to provide a more accurate
temperature reading. Ideality Factor Configuration is available to accomodate remote diodes with a
wide range of ideality factors. This is especially important for microprocessors, FPGAs, and graphics
chips.
The EVB-EMC1043, EVB-EMC1053 and EVB-EMC1063 are USB-based platforms for evaluating the
EMC1043/1053/1063 ICs. A block diagram of the EVB is shown in Figure 1.1 below.
Table 1.1 Application Info for Support Temperature Sensors
Temp Sensor Target Application
EMC1043 Designed for CPUs and GPUs which use a substrate PNP transistor for temperature sensing.
65 and 90nm process geometries are supported. The EMC1043’s default configuration enables
Beta Compensation and Resistance Error Correction (R.E.C.) on both external diodes. The
EMC1043-5 version defaults to Beta Compensation disabled. on external diode 2.
EMC1053 The same as EMC1043 except that Beta Compensation is disabled on both diode channels by
default. R.E.C. is enabled on both channels at power-up.
EMC1063 An ideal solution for AMD CPU thermal diodes, the EMC1063 may also be used with 2N3904
diode-connected transistors. The EMC1063 does not have Beta Compensation or REC features
on external diode channel 1. REC is optional for external diode 2.
Downloaded from Arrow.com.Downloaded from Arrow.com.
