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EMC1184-A-AIA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48
Quad Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
SMSC EMC1184 37 Revision 1.0 (07-11-13)
DATASHEET
6.13 Beta Configuration Registers 25h and 26h
These registers are used to set the Beta Compensation factor that is used for the external diode
channels.
Bit 3 - ENABLE12 - Enables the Beta Compensation factor auto-detection function for External Diode
2 External Diode 1.The ENABLE2 control is disabled for the EMC1184beta compensation cannot be
enabled for External Diode 2 or 3.
The BETA1[2:0] bits will be automatically updated to indicate the current setting.. This is the default
for EMC1184 for External Diode 1 only
Bit 2-0 - BETA1[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.BETA2[2:0] is set to 111b and cannot be changed for the EMC1184.
Care should be taken when setting the BETA1[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
BETA1[2:0] bits should be set to ‘111b’.
Table 6.15 Beta Configuration Register
ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
25h R/W
External
Diode 1 Beta
Configuration
- - - - ENABLE1 BETA1[2:0] 08h
26h R
External
Diode 2 Beta
Configuration
- - - - ENABLE2 BETA2[2:0] 07h
Table 6.16 CPU Beta Values
HEX ENABLE1
BETA1[2:0]
MINIMUM BETA21 0
0h 0 0 0 0 0.11
1h 0 0 0 1 0.18
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
Quad Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
Revision 1.0 (07-11-13) 38 SMSC EMC1184
DATASHEET
6.14 External Diode Ideality Factor Registers 27h to 31h
These registers store the ideality factors that are applied to the external diodes. Table 6.18 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.
Table 6.17 Ideality Configuration Registers
ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
27h R/W
External
Diode 1
Ideality
Factor
- - IDEALITY1[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 6.18 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
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
Quad Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
SMSC EMC1184 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 6.19 when using a CPU
substrate transistor.
APPLICATION NOTE: When measuring a 65nm Intel CPU, the Ideality Setting should be the default 12h. When
measuring a 45nm Intel CPU, the Ideality Setting should be 15h.
16h 1.0133 26h 1.0345 36h 1.0553
17h 1.0146 27h 1.0358 37h 1.0566
Table 6.19 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
14h 1.0026 24h 1.0239 34h 1.0447
15h 1.0039 25h 1.0252 35h 1.0460
16h 1.0053 26h 1.0265 36h 1.0473
17h 1.0066 27h 1.0278 37h 1.0486
Table 6.18 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-P48

EMC1184-A-AIA

Mfr. #:
Buy EMC1184-A-AIA
Manufacturer:
Microchip Technology
Description:
Board Mount Temperature Sensors 1.8V SMBus Dual Tmp Sensor /w Alerts
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