EMC1043-1-ACZL-TR SMSC, EMC1043-1-ACZL-TR Datasheet - Page 15

• Manufacturer Part Number: EMC1043-1-ACZL-TR
• Description: Board Mount Temperature Sensors Temp Snsr
• Manufacturer: SMSC

Specifications of EMC1043-1-ACZL-TR

• Package / Case: MSOP-8
• Digital Output - Bus Interface: SMBus
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
SMSC EMC1043
3.6
3.7
Diode Fault
<= -64
-63.875
-63
-1
0
0.125
1
64
65
127
127.875
128
191
>= 191.875
TEMPERATURE (°C)
Resistance error correction is an automatic feature that eliminates the need to characterize and
compensate for series resistance in the external diode lines. The EMC1043 corrects for as much as
100 ohms of series resistance.
When using a temperature sensor that does not include resistance error correction, voltage developed
across the parasitic resistance in the external diode path produces an error in the reported
temperature. The error introduced by this resistance is approximately +0.7°C per ohm. Sources of
series resistance are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk
resistance in the base and emitter of the temperature transistor.
When monitoring the thermal diode of an AMD K8 processor, the Resistance Error Correction must be
disabled for accurate temperature measurements. This is accomplished by clearing the REC bit in the
configuration 2 register (see
with AMD Processors” for more details.
The Beta Compensation function automatically eliminates temperature errors caused by beta variation
in modern, low beta transistors used for monitoring processor temperatures.
differing currents are applied to temperature transistors can cause significant temperature errors in
monitoring devices. As modern processor geometries shrink the trend is for transistor betas to
decrease, which exacerbates temperature errors.
Resistance Error Correction (REC)
Beta Compensation
100 0000 0000
110 0000 0000
110 0000 0001
110 0000 1000
111 1111 1000
000 0000 0000
000 0000 0001
000 0000 1000
010 0000 0000
010 0000 1000
011 1111 1000
011 1111 1111
011 1111 1111
011 1111 1111
011 1111 1111
Table 3.2 EMC1043 Temperature Data Format
RANGE -64°C TO 127°C
Section
BINARY
DATASHEET
4.5). Please see Application note “13.16 - Using the EMC1043
15
100 0000 0000
100 0000 0000
100 0000 0001
100 0000 1000
101 1111 1000
110 0000 0000
110 0000 0001
110 0000 1000
000 0000 0000
000 0000 1000
001 1111 1000
001 1111 1111
010 0000 0000
011 1111 1000
011 1111 1111
RANGE -64°C TO 191°C
OFFSET BINARY
Revision 1.44 (04-14-08)
Changes in beta as