EMC1404 SMSC Corporation, EMC1404 Datasheet - Page 36

• Manufacturer Part Number: EMC1404
• Description: (EMC1403 / EMC1404) Temperature Sensor
• Manufacturer: SMSC Corporation

Revision 1.16 (03-15-07)
6.13
ADDR.
25h
26h
2
0
0
0
1
Beta Configuration Registers
R/W
R/W
R/W
Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the
corresponding THERM Limit before the THERM pin is asserted. All temperature channels use this
value to set the respective counters. The consecutive THERM counter is incremented whenever any
measurement exceed the corresponding THERM Limit.
If the temperature drops below the THERM limit, then the counter is reset. If a number of consecutive
measurements above the THERM limit occurs, then the THERM pin is asserted low.
Once the THERM pin has been asserted, the consecutive therm counter will not reset until the
corresponding temperature drops below the THERM Limit minus the THERM Hysteresis value.
The bits are decoded as shown in
conversions.
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 ALERT pin is asserted. All temperature channels use this value
to set the respective counters. The bits are decoded as shown in
consecutive out of limit conversion.
This register is used to set the Beta Compensation factor that is used for the external diode channels.
Bit 3 - ENABLEx - Enables the Beta Compensation factor autodetection function. This function shall
be disabled for External Diode 2.
‘0’ - The Beta Compensation Factor autodetection circuitry is disabled. The External Diode will
always use the Beta Compensation factor set by the BETAx[2:0] bits.
‘1’ (default) - The Beta Compensation factor autodetection circuitry is enabled. At the beginning of
every conversion, the optimal Beta Compensation factor setting will be determined and applied.
The BETAx[2:0] bits will be automatically updated to indicate the current setting.
External Diode
External Diode
Configuration
Configuration
REGISTER
1 Beta
2 Beta
1
0
0
1
1
Table 6.14 Consecutive Alert / THERM Settings
Table 6.15 Beta Configuration Registers
B7
-
-
0
0
1
1
1
B6
-
-
DATASHEET
Table
B5
-
-
36
6.14. The default setting is 4 consecutive out of limit
NUMBER OF CONSECUTIVE OUT OF LIMIT
B4
-
-
ENABLE1
ENABLE2
1°C Temperature Sensor with Beta Compensation
(default for CTHRM[2:0])
(default for CALRT[2:0])
B3
MEASUREMENTS
Table
1
2
3
4
B2
6.14. The default setting is 1
BETA1[2:0]
BETA2[2:0]
B1
SMSC EMC1403/EMC1404
B0
EMC1403 or
DEFAULT
EMC1404
08h for
07h for
Datasheet
08h