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EMC1187-1-AIA-TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47
Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications
Datasheet
SMSC EMC1187 37 Revision 1.0 (07-11-13)
DATASHEET
6.14 Beta Configuration Registers 25h and 26h
This register is used to set the Beta Compensation factor that is used for External Diode 2s.
External Diode 2.
‘0’ - The Beta Compensation Factor auto-detection circuitry is disabled.
‘1’ (default) - The Beta Compensation factor auto-detection circuitry is enabled. At the beginning of
every conversion, the optimal Beta Compensation factor setting will be determined and applied.
The BETA2X[2:0] bits will be automatically updated to indicate the current setting. This is the
default for EMC1187
Bit 2-0 - BETA2[2:0] - These bits always reflect the current beta configuration settings. If auto-detection
circuitry is enabled, these bits will be updated automatically and writing to these bits will have no effect.
If the auto-detection circuitry is disabled, these bits will determine the beta configuration setting that is
used for the respective channels.Care should be taken when setting the BETA2[2:0] bits when the
auto-detection circuitry is disabled. If the Beta Compensation factor is set at a beta value that is higher
than the transistor beta, the circuit may introduce measurement errors. When measuring a discrete
thermal diode (such as 2N3904) or a CPU diode that functions like a discrete thermal diode (such as
an AMD processor diode), the BETA2[2:0] bits should be set to ‘111b’.
Table 6.15 Consecutive Alert / Therm Settings
210
NUMBER OF CONSECUTIVE OUT OF LIMIT
MEASUREMENTS
000
1
(default for CALRT[2:0])
001 2
011 3
111
4
(default for CTHRM[2:0])
Table 6.16 Beta Configuration Register
ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
26h R
External
Diode 2 Beta
Configuration
- - - - ENABLE2 BETA2[2:0]
Table 6.17 CPU Beta Values
HEX ENABLE2
BETA2[2:0]
MINIMUM BETA21 0
0h 0 0 0 0 0.11
1h 0 0 0 1 0.18
Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications
Datasheet
Revision 1.0 (07-11-13) 38 SMSC EMC1187
DATASHEET
6.15 External Diode Ideality Factor Register 27h
This register stores the ideality factors that are applied to the external diode. Table 6.19 defines each
setting and the corresponding ideality factor. Beta Compensation and Resistance Error Correction
automatically correct for most diode ideality errors; therefore, it is not recommended that these settings
be updated without consulting SMSC.
2h 0 0 1 0 0.25
3h 0 0 1 1 0.33
4h 0 1 0 0 0.43
5h 0 1 0 1 1.00
6h 0 1 1 0 2.33
7h 0 1 1 1 Disabled
8h - Fh 1 X X X Auto-detection
Table 6.18 Ideality Configuration Registers
ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
27h R/W
External
Diode
Ideality
Factor
- - IDEALITY[5:0] 12h
28h R/W
External
Diode 2
Ideality
Factor
- - IDEALITY2[5:0] 12h
31h R/W
External
Diode 3
Ideality
Factor
- - IDEALITY3[5:0] 12h
Table 6.19 Ideality Factor Look-Up Table (Diode Model)
SETTING FACTOR SETTING FACTOR SETTING FACTOR
08h 0.9949 18h 1.0159 28h 1.0371
09h 0.9962 19h 1.0172 29h 1.0384
0Ah 0.9975 1Ah 1.0185 2Ah 1.0397
Table 6.17 CPU Beta Values (continued)
HEX ENABLE2
BETA2[2:0]
MINIMUM BETA21 0
Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications
Datasheet
SMSC EMC1187 39 Revision 1.0 (07-11-13)
DATASHEET
For CPU substrate transistors that require the BJT transistor model, the ideality factor behaves slightly
differently than for discrete diode-connected transistors. Refer to Table 6.20 when using a CPU
substrate transistor.
0Bh 0.9988 1Bh 1.0200 2Bh 1.0410
0Ch 1.0001 1Ch 1.0212 2Ch 1.0423
0Dh 1.0014 1Dh 1.0226 2Dh 1.0436
0Eh 1.0027 1Eh 1.0239 2Eh 1.0449
0Fh 1.0040 1Fh 1.0253 2Fh 1.0462
10h 1.0053 20h 1.0267 30h 1.0475
11h 1.0066 21h 1.0280 31h 1.0488
12h 1.0080 22h 1.0293 32h 1.0501
13h 1.0093 23h 1.0306 33h 1.0514
14h 1.0106 24h 1.0319 34h 1.0527
15h 1.0119 25h 1.0332 35h 1.0540
16h 1.0133 26h 1.0345 36h 1.0553
17h 1.0146 27h 1.0358 37h 1.0566
Table 6.20 Substrate Diode Ideality Factor Look-Up Table (BJT Model)
SETTING FACTOR SETTING FACTOR SETTING FACTOR
08h 0.9869 18h 1.0079 28h 1.0291
09h 0.9882 19h 1.0092 29h 1.0304
0Ah 0.9895 1Ah 1.0105 2Ah 1.0317
0Bh 0.9908 1Bh 1.0120 2Bh 1.0330
0Ch 0.9921 1Ch 1.0132 2Ch 1.0343
0Dh 0.9934 1Dh 1.0146 2Dh 1.0356
0Eh 0.9947 1Eh 1.0159 2Eh 1.0369
0Fh 0.9960 1Fh 1.0173 2Fh 1.0382
10h 0.9973 20h 1.0187 30h 1.0395
11h 0.9986 21h 1.0200 31h 1.0408
12h 1.0000 22h 1.0213 32h 1.0421
13h 1.0013 23h 1.0226 33h 1.0434
Table 6.19 Ideality Factor Look-Up Table (Diode Model) (continued)
SETTING FACTOR SETTING FACTOR SETTING FACTOR
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47

EMC1187-1-AIA-TR

Mfr. #:
Buy EMC1187-1-AIA-TR
Manufacturer:
Microchip Technology
Description:
Board Mount Temperature Sensors 1.8V SMBus Dual Temp Sensor
Lifecycle:
New from this manufacturer.
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