Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
6.13
External Diode Ideality Factor Register 27h
Table 6.14 Ideality Configuration Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
External
Diode
Ideality
Factor
27h
R/W
-
-
IDEALITY[5:0]
12h
This register stores the ideality factors that are applied to the external diode. Table 6.15 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 6.15 Ideality Factor Look-Up Table (Diode Model)
SETTING
FACTOR
SETTING
FACTOR
SETTING
FACTOR
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
0.9949
0.9962
0.9975
0.9988
1.0001
1.0014
1.0027
1.0040
1.0053
1.0066
1.0080
1.0093
1.0106
1.0119
1.0133
1.0146
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
20h
21h
22h
23h
24h
25h
26h
27h
1.0159
1.0172
1.0185
1.0200
1.0212
1.0226
1.0239
1.0253
1.0267
1.0280
1.0293
1.0306
1.0319
1.0332
1.0345
1.0358
28h
29h
2Ah
2Bh
2Ch
2Dh
2Eh
2Fh
30h
31h
32h
33h
34h
35h
36h
37h
1.0371
1.0384
1.0397
1.0410
1.0423
1.0436
1.0449
1.0462
1.0475
1.0488
1.0501
1.0514
1.0527
1.0540
1.0553
1.0566
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 6.16 when using a CPU
substrate transistor.
SMSC EMC1182
35
Revision 1.0 (07-11-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
