1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
2. Both the Internal Diode and the External Diode 1 read 71°C and External Diode 2 reads 68°C.
Consecutive alert counter for INT is incremented to 2 and for EXT1 is set to 1.
3. The External Diode 1 reads 71°C and both the Internal Diode and External Diode 2 read 69°C.
Consecutive alert counter for INT and EXT2 are cleared and EXT1 is incremented to 2.
4. The Internal Diode reads 71°C and both external diodes read 71°C. Consecutive alert counter for
INT is set to 1, EXT2 is set to 1, and EXT1 is incremented to 3.
5. The Internal Diode reads 71°C and both the external diodes read 71°C. Consecutive alert counter
for INT is incremented to 2, EXT2 is set to 2, and EXT1 is incremented to 4. The HIGH status bit
are set for EXT1. The EXT1 counter is reset to 0 and all other counters hold the last value until
the next temperature measurement.
Bit 7 - TIMEOUT - Determines whether the SMBus Timeout function is enabled.
‘0’ (default) - The SMBus Timeout feature is disabled. The SMCLK line can be held low indefinitely
without the device resetting its SMBus protocol.
‘1’ - The SMBus Timeout feature is enabled. If the SMCLK line is held low for more than 30ms,
then the device will reset the SMBus protocol.
Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of
limit condition or diode fault before the STATUS bits is asserted. All temperature channels use this
value to set the respective counters. The bits are decoded as shown in Table 5.13. The default setting
is 1 consecutive out of limit conversion.
APPLICATION NOTE: If one of the fault queues is not cleared and the CALRT[2:0] bits are updated, the update
won’t take affect until fault queue is cleared. All the fault queues are independent so those
that are empty will be updated immediately.
Table 5.13 Consecutive Alert Settings
NUMBER OF CONSECUTIVE OUT OF LIMIT
2
1
0
MEASUREMENTS
0
0
0
1
0
0
1
1
1
1 (default for CALRT[2:0])
0
2
1
1
3
4
All Others
1 (CALRT[2:0]),
5.10 Beta Configuration Register
Table 5.14 Beta Configuration Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
25h
R/W
External Diode 1
Beta Configuration
-
-
-
-
AUTO1
BETA1[2:0]
08h
26h
71h
R/W
R/W
External Diode 2
Beta Configuration
-
-
-
-
-
-
-
-
AUTO2
AUTO4
BETA2[2:0]
BETA4[2:0]
08h
08h
External Diode 4
Beta Configuration
SMSC EMC1046/EMC1047
Revision 0.69 (06-29-09)
DATA2S9HEET
SMSC [ SMSC CORPORATION ]
