1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones
Datasheet
Chapter 3 Product Description
The EMC1053 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.
A typical system drawing of the EMC1053 is shown in Figure 3.1.
EMC1053
DP1
Host
DN1
DP2
SMBus
Interface
SMBus
DN2
Internal
Diode
Figure 3.1 EMC1053 Diode System
3.1
Power Modes
The EMC1053 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
EMC1053 is not actively converting a channel, it goes into a lower power wait state.
Standby Mode (power-up default) - in this mode, the EMC1053 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 EMC1053 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 EMC1053 continuously samples
and updates all of its temperature channels.
Hotter of Two Mode - In this mode, the EMC1053 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
HOTTER bit is cleared (set to ‘0’), and the results of the two remote zones are stored in their
respective registers.
SMSC EMC1053
Revision 1.37 (02-05-07)
DATAS11HEET
SMSC [ SMSC CORPORATION ]
