Table 6-4 . ets register settings -10, Table6-4.etsregistersettings – Maxim Integrated MAX31782 User Manual
Page 53
MaximIntegrated 6-10
MAX31782 User’s Guide
Revision 0; 8/11
6.2.5ExternalTemperatureSlopeControlRegister(ETS)
Register Address: M1[16h]
The ETS register changes the slope of external temperature measurements to compensate for changes in diode
ideality factor . The MAX31782 is factory calibrated to work with a diode-connected 2N3904 NPN transistor with an
ideality factor of 1 .004 .
shows the possible settings for the ETS register and the corresponding ideality
factor .
also shows the change in the reported temperature for each ETS register setting when the external
diodes are at room temperature . The ETS register should only be set to the values shown in
.
Table6-4.ETSRegisterSettings
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
—
—
ETS7
ETS6
ETS5
ETS4
ETS3
ETS2
ETS1
ETS0
Reset
0
0
0
0
0
0
0
0
0
1
0
1
1
1
0
0
Access
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
ETS
IDEALITYFACTOR
TEMPERATUREDELTAFROM0x7C(°C)
0x00
1 .0244
-7 .37
0x04
1 .0232
-7 .01
0x0C
1 .0220
-6 .63
0x10
1 .0208
-6 .36
0x14
1 .0196
-5 .96
0x1C
1 .0184
-5 .62
0x20
1 .0172
-5 .43
0x24
1 .0160
-5 .08
0x2C
1 .0148
-4 .71
0x30
1 .0136
-4 .51
0x34
1 .0124
-3 .97
0x3C
1 .0112
-3 .7
0x40
1 .0100
-3 .65
0x44
1 .0088
-3 .23
0x4C
1 .0076
-2 .86
0x50
1 .0064
-2 .65
0x54
1 .0052
-2 .23
0x5C
1 .0040
-1 .96
0x60
1 .0028
-1 .75
0x64
1 .0016
-1 .3
0x6C
1 .0004
-0 .97
0x70
0 .9992
-0 .67
0x74
0 .9980
-0 .33
0x7C
0 .9968
0