1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
CPU
EMC1043-5
Host
DP1
DN1
Thermal
Diode
SMBus
Interface
SMBus
DP2
DN2
Remote diode-connected transistor
Internal
Diode
Figure 3.2 EMC1043-5 Mixed System
3.1
Power Modes
The EMC1043 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
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.
3.2
3.3
One Shot During Standby Mode
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.
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 EMC1043 continuously samples
and updates all of its temperature channels.
Hotter of Two Mode - In this mode, the EMC1043 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.
3.3.1
Conversion Rates
The EMC1043 may be configured for different conversion rates based on the system requirements.
The available rates are 1 full set of conversions per second to 16 full sets of conversions per second.
The conversion rate is configured as described in Section 4.4. The available conversion rates are
shown in Table 4.4.
Revision 1.37 (09-05-06)
SMSC EMC1043
DATA1S2HEET
SMSC [ SMSC CORPORATION ]
