EMC6D100-DK SMSC [SMSC Corporation], EMC6D100-DK Datasheet - Page 32

• Manufacturer Part Number: EMC6D100-DK
• Description: ENVIRONMENTAL MONITORING AND CONTROL DEVICE WITH AUTOMATIC FAN CAPABILITY
• Manufacturer: SMSC [SMSC Corporation]

SMSC EMC6D100/EMC6D101
Override all PWM
except if disabled
outputs to 100%
*
When operating in Auto Fan Control Operating Mode the hardware controls the fans directly based on
monitoring of temperature and speed.
To control the fans:
1.
2.
See section 8.18 Registers 5C-5Eh: Fan Configuration on page 51 for details
duty
Time Elapsed?
Set the minimum temperature that will turn the fans on/off. This value is programmed in Registers
67h-69h: Zone x Temp LIMIT (Auto Fan Mode Only).
Set the hysteresis value for the minimum temperature that will turn the fans off. This value will hold
the fans on until the temperature goes a certain amount below the value programmed in the Zone x
Temp Limit registers. This value will prevent the fan from oscillating between on and off if the
Spin Up
(5C-5E)
No
Begin Fan Spin-Up
Set Fan Output to
100%
FIGURE 7.1 - AUTOMATIC FAN CONTROL FLOW DIAGRAM
Yes
Yes
Yes
End Fan Spin Up
Yes
Set fan speed based on
Auto Fan Range
Temp >= Limit
DATASHEET
Fan Output
Algorithm*
Temp >=
AbsLimit
(69~6B)
(66~68)
At 0%?
Yes
No
No
Fan Spinning Up?
End Polling Cycle
No
Begin Polling
Cycle
Page 32
No
Auto Fan Mode
Off/Min set to 1?
Set fan to min
Initiated
PWM
(62)
Yes
No
Environmental Monitoring and Control Device
Set Fan Output to
.
Fan Output
Hyst Temp
Temp >=
(6C~6D)
At 0%?
0%
No
Yes
minimum speed.
Set fan output to
auto fan mode
(63~65)
Rev. 09-09-04
No
Datasheet
Yes