1°C Triple SMBus Sensor with Resistance Error Correction
Datasheet
4.18
Ideality Factor Register
The ideality factor registers are used to program the remote diode ideality factor into the EMC1033 so
that this error source can be eliminated. There are separate registers for both remote diodes so the
ideality factor compensation for each diode is programmed independently. The default ideality factor is
1.008 and has a value of XX010010b or 12h.
Table 4.9 Diode Ideality Factor Values
DIODE
IDEALITY
FACTOR
DIODE
IDEALITY
FACTOR
DIODE
IDEALITY
FACTOR
DIODE
IDEALITY
FACTOR
VALUE
VALUE
VALUE
VALUE
XX00 0000
XX01 0000
XX10 0000
XX11 0000
0.9850
0.9862
0.9875
0.9888
0.9900
0.9913
0.9925
0.9938
0.9951
0.9964
0.9976
0.9989
1.0002
1.0015
1.0028
1.0041
1.0054
1.0067
1.0080
1.0093
1.0106
1.0119
1.0133
1.0146
1.0159
1.0173
1.0186
1.0199
1.0213
1.0226
1.0240
1.0253
1.0267
1.0280
1.0294
1.0308
1.0321
1.0335
1.0349
1.0363
1.0377
1.0391
1.0404
1.0418
1.0432
1.0446
1.0460
1.0475
1.0489
1.0503
1.0517
1.0531
1.0546
1.0560
1.0574
1.0589
1.0603
1.0618
1.0632
1.0647
1.0661
1.0676
1.0690
1.0705
XX00 0001
XX00 0010
XX00 0011
XX00 0100
XX00 0101
XX00 0110
XX00 0111
XX00 1000
XX00 1001
XX00 1010
XX00 1011
XX00 1100
XX00 1101
XX00 1110
XX00 1111
XX01 0001
XX01 0010
XX01 0011
XX01 0100
XX01 0101
XX01 0110
XX01 0111
XX01 1000
XX01 1001
XX01 1010
XX01 1011
XX01 1100
XX01 1101
XX01 1110
XX01 1111
XX10 0001
XX10 0010
XX10 0011
XX10 0100
XX10 0101
XX10 0110
XX10 0111
XX10 1000
XX10 1001
XX10 1010
XX10 1011
XX10 1100
XX10 1101
XX10 1110
XX10 1111
XX11 0001
XX11 0010
XX11 0011
XX11 0100
XX11 0101
XX11 0110
XX11 0111
XX11 1000
XX11 1001
XX11 1010
XX11 1011
XX11 1100
XX11 1101
XX11 1110
XX11 1111
4.19
Consecutive ALERT Register
Bit 7 of the Consecutive ALERT register enables the SMBus timeout feature when set to 1 (the default
setting is 0). When enabled, the SMBus will timeout after approximately 25ms of inactivity. Table 4.11
describes how bits 3-1 of the Consecutive ALERT register set how many consecutive error conditions
must occur for each temperature measurement zone before the ALERT/THERM2 signal is asserted.
These error conditions include diode faults and exceeding temperature limits. The default value is one
which means that any out-of-limit measurement or any diode fault will cause the ALERT/THERM2 pin
to be asserted. Any combination of bits 3-1 other than those shown will result in a value of one.
SMSC EMC1033
Revision 1.1 (01-19-07)
DATA1S9HEET
SMSC [ SMSC CORPORATION ]
