EVB-EMC1043 SMSC, EVB-EMC1043 Datasheet - Page 11

• Manufacturer Part Number: EVB-EMC1043
• Description: BOARD EVALUATION FOR EMC1043
• Manufacturer: SMSC

Specifications of EVB-EMC1043

• Sensor Type: Temperature
• Sensing Range: -64°C ~ 191°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: EMC1043
• Processor To Be Evaluated: EMC1043
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1039; EVB-EMC1043C; EVB-EMC1043C; Q4207578

1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 3 Product Description
SMSC EMC1043
3.1
3.2
Remote diode-connected transistor
The EMC1043 is an SMBus sensor that monitors three temperature zones for use in a personal
computer or embedded environment. The part may be used as a companion to one of SMSC’s broad
line of SIO host devices to perform fan control and thermal management.
The EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are designed specifically to work with a
CPU that implements the thermal diode as a PNP substrate transistor with the collector connected to
GND. A new feature called beta compensation automatically compensates for measurement error
caused by beta variation in CPU thermal diodes as described in
Because the beta compensation circuit is designed to work with PNP substrate transistors, the
EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are not typically used with diode-connected
transistors (such as the 2N3904) or CPUs that implement the thermal diode as a two-terminal diode
(such as the AMD processor). However, the beta compensation feature may be disabled by configuring
the appropriate register as described in
thermal diode, refer to the EMC1063.
A typical system is shown in
The EMC1043 has two power modes.
The EMC1043 supports a One-Shot command when it is in Standby Mode. Writing to the One-Shot
register will cause the device to power up, perform 1 full set of temperature conversions, then return
to Standby Mode.
Power Modes
One Shot During Standby Mode
Thermal
Diode
Run Mode - In this mode, the temperature monitors are active and converting at the programmed
conversion rate. The average power dissipation will depend on the conversion rate. When the
EMC1043 is not actively converting a channel, it goes into a lower power wait state.
Standby Mode (power-up default) - in this mode, the EMC1043 is put into a low power state. In the
standby mode, temperature monitoring is disabled. The device will still respond to SMBus
commands.
CPU
Figure 3.1 EMC1043 System Drawing
DP1
DN1
DP2
DN2
EMC1043
Internal
Figure 3.1
Diode
DATASHEET
Section
11
SMBus
4.8. For applications that measure a two-terminal
Interface
SMBus
Section
Host
3.7.
Revision 1.44 (04-14-08)