emc1413 Standard Microsystems Corp., emc1413 Datasheet - Page 17

• Manufacturer Part Number: emc1413
• Description: 1?c Temperature Sensor With Beta Compensation And Selectable Address
• Manufacturer: Standard Microsystems Corp.

1°C Temperature Sensor with Beta Compensation and Selectable Address
Datasheet
SMSC EMC1413 / EMC1414
5.1
5.1.1
5.1.2
Anti-parallel
diodes
The EMC1413 and EMC1414 have two modes of operation:
Conversion Rates
The EMC1413 and EMC1414 may be configured for different conversion rates based on the system
requirements. The conversion rate is configured as described in
Register". The default conversion rate is 4 conversions per second. Other available conversion rates
are shown in
Dynamic Averaging
Dynamic averaging causes the EMC1413 and EMC1414 to measure the external diode channels for
an extended time based on the selected conversion rate. This functionality can be disabled for
increased power savings at the lower conversion rates (see
When dynamic averaging is enabled, the device will automatically adjust the sampling and
measurement time for the external diode channels. This allows the device to average 2x or 16x longer
than the normal 11 bit operation (nominally 21ms per channel) while still maintaining the selected
conversion rate. The benefits of dynamic averaging are improved noise rejection due to the longer
integration time as well as less random variation of the temperature measurement.
When enabled, the dynamic averaging applies when a one-shot command is issued. The device will
perform the desired averaging during the one-shot operation according to the selected conversion rate.
When enabled, the dynamic averaging will affect the average supply current based on the chosen
conversion rate as shown in
EMC1413.
Thermal
Modes of Operation
diode
CPU
Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the
programmed conversion rate. The temperature data is updated at the end of every conversion and
the limits are checked. In Active mode, writing to the one-shot register will do nothing.
Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce
supply current. The temperature data is not updated and the limits are not checked. In this mode
of operation, the SMBus is fully active and the part will return requested data. Writing to the one-
shot register will enable the device to update all temperature channels. Once all the channels are
updated, the device will return to the Standby mode.
Table 6.6, "Conversion
Figure 5.2 System Diagram for EMC1414
DP2
DN2
DN1
EMC1414
DP1
Internal
Diode
Table 5.1, "Supply Current vs. Conversion Rate for EMC1413"
DATASHEET
Rate".
THERM
SMCLK
SMDATA
ALERT
17
Interface
Power Control
SMBus
Host
Section 6.4, "Configuration
Section 6.5, "Conversion Rate
Revision 1.37 (12-23-09)
Register").
for