EMC1424 SMSC Corporation, EMC1424 Datasheet - Page 18

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

Revision 1.16 (03-15-07)
5.1
CONVERSION RATE
CONVERSION RATE
4 / sec (default)
64 / sec
16 / sec
32 / sec
64 / sec
1 / sec
2 / sec
8 / sec
SYS_SHDN Output
When enabled, the dynamic averaging will affect the average supply current based on the chosen
conversion rate as shown in
The SYS_SHDN output is asserted independently of the ALERT output and cannot be masked. If the
External Diode 1 temperature exceeds the Hardware Thermal Shutdown Limit for the programmed
number of consecutive measurements, then the SYS_SHDN pin is asserted.
The Hardware Thermal Shutdown Limit is defined at power-up via the pull-up resistors on the
SYS_SHDN and ALERT pins as shown in
software.
In addition to External Diode 1 channel triggering the SYS_SHDN pin when the measured temperature
exceeds to the Hardware Thermal Shutdown Limit, each of the measurement channels can be
configured to assert the SYS_SHDN pin when they exceed the corresponding THERM Limit.
When the SYS_SHDN pin is asserted, it will not release until the External Diode 1 temperature drops
below the Hardware Thermal Shutdown Limit minus 10°C and all other measured temperatures drop
below the THERM Limit minus the THERM Hysteresis value (when linked to SYS_SHDN).
Figure 5.3
pin.
Table 5.1 Supply Current vs. Conversion Rate for EMC1423 (continued)
shows a block diagram of the interaction between the input channels and the SYS_SHDN
Table 5.2 Supply Current vs. Conversion Rate for EMC1424
AVERAGE SUPPLY CURRENT
(DEFAULT)
ENABLED
(DEFAULT)
ENABLED
AVERAGE SUPPLY CURRENT
485uA
505uA
540uA
610uA
625uA
650uA
715uA
810uA
Table 5.2
DATASHEET
for EMC1424.
DISABLED
18
165uA
225uA
355uA
610uA
625uA
650uA
715uA
DISABLED
Table
810uA
1°C Temperature Sensor with Hardware Thermal Shutdown
5.3. This limit cannot be modified or masked via
AVERAGING FACTOR (BASED ON 11-BIT
(DEFAULT)
ENABLED
AVERAGING FACTOR (BASED ON
0.125x
0.25x
(DEFAULT)
0.5x
ENABLED
8x
4x
2x
1x
0.25x
11-BIT OPERATION)
OPERATION)
SMSC EMC1423/EMC1424
DISABLED
DISABLED
0.125x
0.25x
0.5x
0.25x
1x
1x
1x
1x
Datasheet