EMC6D103-CK SMSC [SMSC Corporation], EMC6D103-CK Datasheet - Page 31

• Manufacturer Part Number: EMC6D103-CK
• Description: FAN CONTROL DEVICE WITH HIGH FREQUENCY PWM
• Manufacturer: SMSC [SMSC Corporation]

Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Datasheet
SMSC EMC6D103
6.9.3
SENSOR ERROR
TEMPERATURE
+127
-127
+25
-50
-25
+50
+1
-1
0
Before a remote diode conversion is updated, the status of the remote diode is checked. In the case
of a short or open-circuit on the remote thermal diode inputs, the value in the corresponding reading
register will be forced to 80h. Note that this will cause the associated remote diode limit exceeded
status bit to be set (i.e. Remote Diode x Limit Error bits (D1 and D2) are located in the Interrupt Status
1 Register at register address 41h).
The temperature change is computed by measuring the change in Vbe at two different operating points
of the diode to which the Remote x+ and Remote x- pins are connected. But accuracy of the
measurement also depends on non-ideality factor of the process the diode is manufactured on.
Temperature Data Format
Temperature data can be read from the three temperature registers:
■
■
■
Table 6.6, "Temperature Data Format"
data, represented by an 8-bit, two’s complement word with an LSB equal to 1.0
0
0
0
0
0
0
C
0
C
0
0
C
C
C
C
C
C
C
Internal Temp Reading register (26h)
Remote Diode 1 Temp Reading register (25h)
Remote Diode 2 Temp Reading register (27h)
READING (DEC)
Table 6.6 Temperature Data Format
-127
127
128
-50
-25
25
50
-1
0
1
DATASHEET
shows several examples of the format of the temperature digital
31
READING (HEX)
CEh
E7h
FFh
81h
00h
01h
19h
32h
7Fh
80h
DIGITAL OUTPUT
Revision 0.4 (04-04-05)
0
C.
1000 0001
0000 0000
0000 0001
0001 1001
0011 0010
1000 0000
1100 1110
1110 0111
1111 1111
0111 1111