1°C Triple Temperature Sensor with Hotter of Two Zones
Datasheet
Chapter 3 Product Description
The EMC1063 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 EMC1063 is designed to operate with two AMD thermal diodes. The External diode 2 channel can
be configured with the Resistance Error Correction feature enabled to measure a discrete 2N3904
diode. A typical system is shown in Figure 3.1.
CPU
EMC1063
Host
DP1
Thermal
diode
DN1
SMBus
Interface
SMBus
DP2
DN2
Thermal
diode
Internal
Diode
CPU
Figure 3.1 EMC1063 Diode System
3.1
Power Modes
The EMC1063 has two power modes.
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
EMC1063 is not actively converting a channel, it goes into a lower power wait state.
Standby Mode (power-up default) - in this mode, the EMC1063 is put into a low power state. In the
standby mode, temperature monitoring is disabled. The device will still respond to SMBus
commands.
3.2
3.3
One Shot During Standby Mode
The EMC1063 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.
Operation During Run Mode
When the device is active, there are two modes of operation available.
Normal Mode (power-up default) - In this mode of operation, the EMC1063 continuously samples
and updates all of its temperature channels.
Hotter of Two Mode - In this mode, the EMC1063 continuously samples and then compares the
two remote zones. The hotter of the two remote zones is loaded into the External Diode 2 Data
Registers. In addition, the HOTTER bit in the Status register is set or cleared to indicate which
external diode zone is hotter. If the two remote zones are exactly equal to each other, then the
SMSC EMC1063
Revision 1.37 (02-05-07)
DATAS11HEET
SMSC [ SMSC CORPORATION ]
