EMC1424 SMSC Corporation, EMC1424 Datasheet - Page 17

• Manufacturer Part Number: EMC1424
• Description: (EMC1423 / EMC1424) Temperature Sensor
• Manufacturer: SMSC Corporation

1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
SMSC EMC1423/EMC1424
5.0.1
5.0.2
CONVERSION RATE
4 / sec (default)
Anti-parallel
diodes
16 / sec
32 / sec
1 / sec
2 / sec
8 / sec
Conversion Rates
The EMC1423 and EMC1424 may be configured for different conversion rates based on the system
requirements. The conversion rate is configured as described in
rate is 4 conversions per second. Other available conversion rates are shown in
Dynamic Averaging
Dynamic averaging causes the EMC1423 and EMC1424 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
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 will affect the average supply current based on the chosen
conversion rate as shown in
Thermal
diode
CPU
Table 5.1 Supply Current vs. Conversion Rate for EMC1423
(DEFAULT)
Figure 5.2 System Diagram for EMC1424
ENABLED
AVERAGE SUPPLY CURRENT
610uA
625uA
660uA
725uA
740uA
760uA
DP2
DN2
DP1
DN1
EMC1424
Table 5.1
Internal
Diode
DATASHEET
for EMC1423.
SYS_SHDN
17
SMCLK
SMDATA
DISABLED
ALERT
150uA
295uA
290uA
480uA
740uA
760uA
Interface
Power Control
SMBus
Section
Host
AVERAGING FACTOR (BASED ON
(DEFAULT)
ENABLED
Section
6.4). When dynamic averaging is
0.5x
16x
8x
4x
2x
1x
11-BIT OPERATION)
6.5. The default conversion
Revision 1.16 (03-15-07)
Table
DISABLED
6.6.
0.5x
1x
1x
1x
1x
1x