EMC6D103-CK SMSC [SMSC Corporation], EMC6D103-CK Datasheet - Page 55

• 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
8.2.3
INPUT
+2.5V
Register
Address
+12V
Register
Address
Vccp
VCC
+5V
22h
23h
24h
25h
26h
27h
NOMINAL
VOLTAGE
2.25V
12.0V
Read/
Read/
Write
Write
2.5V
3.3V
5.0V
The Voltage Reading registers reflect the current voltage of the EMC6D103 voltage monitoring inputs.
Voltages are presented in the registers at ¾ full scale for the nominal voltage, meaning that at nominal
voltage, each register will read C0h.
The Voltage Reading registers will be updated automatically by the EMC6D103 Chip with a minimum
frequency of 4Hz. These registers are read only – a write to these registers has no effect.
Registers 25-27h: Temperature Reading
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes.
Remote Diode 1 Temp Reading register reports the temperature measured by the Remote1- and
Remote1+ pins, Remote Diode 2 Temp Reading register reports the temperature measured by the
Remote2- and Remote2+ pins, and the Internal Temp Reading register reports the temperature
measured by the internal (ambient) temperature sensor. Current temperatures are represented as 8
bit, 2’s complement, signed numbers in Celsius, as shown below in
Reading register will return a value of 80h if the remote diode pins are not implemented by the board
designer or are not functioning properly (this corresponds to the diode fault interrupt status bits). The
Temperature Reading registers will be updated automatically by the EMC6D103 Chip with a minimum
frequency of 4Hz.
Note: These registers are read only – a write to these registers has no effect.
Each of the temperature reading registers are mapped to a zone. Each PWM may be programmed to
operate in the auto fan control operating mode by associating a PWM with one or more zones. The
following is a list of the zone associations.
R
R
R
R
R
R
Remote Diode 1 Temp Reading
Remote Diode 2 Temp Reading
Table 8.3 Registers 20-24h: Voltage Reading (continued)
READING AT
Internal Temp Reading
REGISTER
VOLTAGE
NOMINAL
Table 8.5 Registers 25-27h: Temperature Reading
Register Name
Register Name
+12V Reading
VCC Reading
+5V Reading
C0h
C0h
C0h
C0h
C0h
Table 8.4 Voltage vs. Register Reading
MAXIMUM
VOLTAGE
16.00V
3.32V
3.00V
4.38V
6.64V
DATASHEET
(MSb)
(MSb)
Bit 7
Bit 7
7
7
7
7
7
7
55
Bit 6
Bit 6
6
6
6
6
6
6
READING AT
REGISTER
MAXIMUM
VOLTAGE
FFh
FFh
FFh
FFh
FFh
Bit 5
Bit 5
5
5
5
5
5
5
Bit 4
Bit 4
4
4
4
4
4
4
Bit 3
Bit 3
VOLTAGE
MINIMUM
3
3
3
3
3
3
0V
0V
0V
0V
0V
Bit 2
Bit 2
Table
2
2
2
2
2
2
8.6. The Temperature
MINIMUM VOLTAGE
Bit 1
Bit 1
Revision 0.4 (04-04-05)
1
1
1
1
1
1
READING AT
REGISTER
(LSb)
(LSb)
Bit 0
Bit 0
0
0
0
0
0
0
00h
00h
00h
00h
00h
Default
Default
Value
Value
N/A
N/A
N/A
N/A
N/A
N/A