EMC2303-1-KZ-TR SMSC, EMC2303-1-KZ-TR Datasheet - Page 61

• Manufacturer Part Number: EMC2303-1-KZ-TR
• Description: Industrial Temperature Sensors RPM B Fan Controller w/HW Thermal Shutdwn
• Manufacturer: SMSC

Specifications of EMC2303-1-KZ-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
8.2.14
Register
Address
5Fh
60h
61h
Temperature
Below Fan Temp Limit: Fan at Fan PWM
Minimum
Read/
Write
R/W
R/W
R/W
Registers 5F-61h: Zone Temperature Range, PWM Frequency
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
In Auto Fan Mode, when the temperature for a zone is above the Low Temperature Limit (registers
67-69h) and below the Absolute Temperature Limit (registers 6A-6Ch) the speed of a fan assigned to
that zone is determined as follows by the auto fan control logic.
When the temperature reaches the temperature value programmed in the Zone x Low Temp Limit
register, the PWM output assigned to that zone is at PWMx Minimum Duty Cycle. Between Zone x
Low Temp Limit and (Zone x Low Temp Limit + Zone x Range), the PWM duty cycle increases linearly
according to the temperature as shown in the figure below.
Table 8.25 Registers 5F-61h: Zone Temperature Range, PWM Frequency
SPIN[2:0]
Zone 1 Range / Fan 1
Zone 2 Range / Fan 2
Zone 3 Range / Fan 3
000
001
010
011
100
101
110
111
Register Name
Frequency
Frequency
Frequency
Figure 8.1 Fan Activity Above Low Temp Limit
Table 8.24 Fan Spin-Up Register
(MSb)
RAN3
RAN3
RAN3
Bit 7
output at MIN FAN
Temperature Low LIMIT:
DATASHEET
RAN2
RAN2
RAN2
Bit 6
61
RAN1
RAN1
RAN1
Bit 5
RAN0
RAN0
RAN0
Bit 4
PWM Duty is linear
FRQ3
FRQ3
FRQ3
this range
250ms (default)
SPIN UP TIME
Bit 3
1000ms
2000ms
4000ms
100ms
400ms
700ms
0 sec
FRQ2
FRQ2
FRQ2
Bit 2
Low LIMIT+ RANGE:
Output at 100% Duty
FRQ1
FRQ1
FRQ1
Bit 1
Revision 0.32 (06-23-08)
FRQ0
FRQ0
FRQ0
(LSb)
Bit 0
Default
Value
C3h
C3h
C3h