EMC1423_12 Datasheet, PDF (38/51 Pages) SMSC Corporation – 1°C Temperature Sensor with Hardware Thermal Shutdown

6.11
1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
Hardware Thermal Shutdown Limit Register
Table 6.12 Hardware Thermal Shutdown Limit Register
ADDR. R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0 DEFAULT
Hardware
1Eh
R
Thermal
128 64 32 16
8
4
2
1
N/A
Shutdown Limit
6.12
This read only register returns the Hardware Thermal Shutdown Limit selected by the value of the pull-
up resistors on the ALERT and SYS_SHDN pins. The data represents the hardware set temperature
in °C using the active temperature setting set by the RANGE bit in the Configuration Register. See
Table 6.5 for the data format.
When the External Diode 1 Temperature exceeds this limit, the SYS_SHDN pin is asserted and will
remain asserted until the External Diode 1 Temperature drops below this limit minus 10°C.
Channel Mask Register
ADDR. R/W
1Fh R/W
REGISTER
Channel
Mask
Table 6.13 Channel Mask Register
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
-
-
-
-
E3
E2
E1
INT
MASK MASK MASK MASK
00h
The Channel Mask Register controls individual channel masking. When a channel is masked, the
ALERT pin will not be asserted when the masked channel reads a diode fault or out of limit error. The
channel mask does not mask the SYS_SHDN pin.
Bit 3 - E3MASK - Masks the ALERT pin from asserting when the External Diode 3 channel is out of
limit or reports a diode fault.
„ ‘0’ (default) - The External Diode 3 channel will cause the ALERT pin to be asserted if it is out of
limit or reports a diode fault.
„ ‘1’ - The External Diode 3 channel will not cause the ALERT pin to be asserted if it is out of limit
or reports a diode fault.
Bit 2 - E2MASK - Masks the ALERT pin from asserting when the External Diode 2 channel is out of
limit or reports a diode fault.
„ ‘0’ (default) - The External Diode 2 channel will cause the ALERT pin to be asserted if it is out of
limit or reports a diode fault.
„ ‘1’ - The External Diode 2 channel will not cause the ALERT pin to be asserted if it is out of limit
or reports a diode fault.
Bit 1 - E1MASK - Masks the ALERT pin from asserting when the External Diode 1 channel is out of
limit or reports a diode fault.
„ ‘0’ (default) - The External Diode 1 channel will cause the ALERT pin to be asserted if it is out of
limit or reports a diode fault.
„ ‘1’ - The External Diode 1 channel will not cause the ALERT pin to be asserted if it is out of limit
or reports a diode fault.
Bit 0 - INTMASK - Masks the ALERT pin from asserting when the Internal Diode temperature is out
of limit.
„ ‘0’ (default) - The Internal Diode channel will cause the ALERT pin to be asserted if it is out of limit.
Revision 2.0 (08-10-12)
38
DATASHEET
SMSC EMC1423/EMC1424