EMC6D102-CZC View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
EMC6D102-CZC
SMSC -> Microchip
'EMC6D102-CZC' PDF : 86 Pages View PDF
Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features
Datasheet
The Voltage Reading registers reflect the current voltage of the EMC6D102 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.
Table 7.2 Voltage vs. Register Reading
NOMINAL
INPUT VOLTAGE
+2.5V
Vccp
VCC
+5V
+12V
2.5V
2.25V
3.3V
5.0V
12.0V
REGISTER
READING AT
NOMINAL
VOLTAGE
C0h
C0h
C0h
C0h
C0h
MAXIMUM
VOLTAGE
3.32V
3.00V
4.38V
6.64V
16.00V
REGISTER
READING AT
MAXIMUM
VOLTAGE
FFh
FFh
FFh
FFh
FFh
REGISTER
MINIMUM
READING AT
VOLTAGE MINIMUM VOLTAGE
0V
00h
0V
00h
0V
00h
0V
00h
0V
00h
7.2.4
The Voltage Reading registers will be updated automatically by the EMC6D102 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
Register
Address
25h
26h
27h
Read/
Write
R
R
R
Register Name
Remote Diode 1 Temp Reading
Internal Temp Reading
Remote Diode 2 Temp Reading
Bit 7
(MSb)
7
7
7
Bit 6
6
6
6
Bit 5
5
5
5
Bit 4 Bit 3 Bit 2
4
3
2
4
3
2
4
3
2
Bit 1
1
1
1
Bit 0
(LSb)
0
0
0
Default
Value
N/A
N/A
N/A
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 Table 7.3. The Temperature
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 EMC6D102 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.
■ Zone 1 is controlled by Remote Diode 1 Temp Reading
■ Zone 2 is controlled by Internal Temp Reading (Ambient Temperature Sensor)
■ Zone 3 is controlled by Remote Diode 2 Temp Reading
SMSC EMC6D102
49
DATASHEET
Revision 0.4 (04-05-05)
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