EMC2101-R-ACZL-TR SMSC, EMC2101-R-ACZL-TR Datasheet - Page 39

• Manufacturer Part Number: EMC2101-R-ACZL-TR
• Description: Board Mount Temperature Sensors Single Fan Controller
• Manufacturer: SMSC

Specifications of EMC2101-R-ACZL-TR

• Full Temp Accuracy: +/- 2 C , +/- 3 C
• Package / Case: MSOP
• Output Type: Analog
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
SMSC EMC2101
6.13
ADDR.
18h
SETTING
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
R/W
R/W
This register is used to set the Beta Compensation factor that is used for the External Diode channel.
When using a diode-connected transistor (such as the 2N3904) or CPUs that implement the thermal
diode as a two-terminal diode, the CPU compensation circuit must be disabled by writing a value of
07h to this register.
Bit 3 - ENABLE - enables the Beta Compensation Factor Autodetection Algorithm
Bit 2-0 - BETA[2:0] - selects the Beta Compensation factor that the External Diode will use if the
autodetection circuitry is disabled.
expected beta value of the substrate transistor connected to the External Diode channel.
Care should be taken when setting the BETA[2:0] bits. If the Beta Compensation factor is set at a beta
value that is higher than the transistor beta, then the circuit may introduce measurement errors.
Beta Compensation Register
‘0’ - the Beta Compensation Factor Autodetection circuitry is disabled. The External Diode will
always use the Beta Compensation factor set by the BETA[2:0] bits.
‘1’ (default) - the Beta Compensation Factor Autodetection circuitry is enabled. At the beginning of
every conversion, the circuitry will determine the optimal Beta Compensation factor setting and use
the detected setting. The value of the BETA[2:0] bits will be ignored.
Beta Compensation
FACTOR
REGISTER
1.0027
1.0040
1.0053
1.0066
1.0080
1.0093
1.0106
1.0119
1.0133
1.0146
Table 6.13 Ideality Factor Look-Up Table (continued)
Table 6.14 Beta Compensation Register
SETTING
B7
-
1Eh
1Fh
20h
21h
22h
23h
24h
25h
26h
27h
DATASHEET
Table 6.15
B6
-
39
B5
-
shows the setting that should be used based on the
FACTOR
1.0239
1.0253
1.0267
1.0280
1.0293
1.0306
1.0319
1.0332
1.0345
1.0358
B4
-
ENABLE
B3
SETTING
B2
2Eh
2Fh
30h
31h
32h
33h
34h
35h
36h
37h
BETA[2:0]
B1
Revision 2.54 (06-16-09)
B0
FACTOR
1.0449
1.0462
1.0475
1.0488
1.0501
1.0514
1.0527
1.0540
1.0553
1.0566
DEFAULT
08h