EMC1402-2-ACZL-TR View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'EMC1402-2-ACZL-TR' PDF : 37 Pages View PDF
1°C Temperature Sensor with Beta Compensation
Datasheet
„ ‘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 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 Table 6.13. The default setting is 4 consecutive out of limit
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 Table 6.13. The default setting is 1
consecutive out of limit conversion.
Table 6.13 Consecutive Alert / THERM Settings
NUMBER OF CONSECUTIVE OUT OF LIMIT
2
1
0
MEASUREMENTS
0
0
0
0
0
1
0
1
1
1
1
1
1
(default for CALRT[2:0])
2
3
4
(default for CTHRM[2:0])
6.12 Beta Configuration Registers
ADDR.
25h
R/W
R/W
Table 6.14 Beta Configuration Registers
REGISTER
B7
B6
B5
B4
B3
External
Diode 1 Beta -
-
-
-
ENABLE
Configuration
B2 B1 B0
BETA[2:0]
DEFAULT
08h
This register is used to set the Beta Compensation factor that is used for the external diode channel.
Bit 3 - ENABLE - Enables the Beta Compensation factor autodetection function.
„ ‘0’ - The Beta Compensation Factor autodetection circuitry is disabled. The External Diode will
always use the Beta Compensation factor set by the BETA[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 BETA[2:0] bits will be automatically updated to indicate the current setting.
Bit 2-0 - BETA[2:0] - These bits always reflect the current beta configuration settings. If autodetection
circuitry is enabled, then these bits will be updated automatically and writing to these bits will have no
effect. If the autodetection circuitry is disabled, then these bits will determine the beta configuration
setting that is used for their respective channels.
SMSC EMC1402
31
DATASHEET
Revision 2.0 (08-10-12)
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