EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 26

• Manufacturer Part Number: EMC2303-1-KP-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EMC2303-1-KP-TR

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 12
• Lead Free Status / RoHS Status: Compliant

Revision 1.2 (03-22-10)
ADDR
3Ah
3Bh
3Ch
3Dh
3Eh
3Fh
36h
37h
38h
39h
40h
41h
42h
43h
45h
46h
47h
48h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
Fan 1 Valid TACH
TACH 1 Reading
TACH 1 Reading
Fan 1 Max Step
Fan 1 Drive Fail
Fan 1 Drive Fail
Fan 2 Max Step
Band High Byte
Fan 1 Minimum
Fan 2 Minimum
Band Low Byte
Configuration 2
TACH 1 Target
TACH 1 Target
Fan 1 Spin Up
Fan 2 Spin Up
PWM 2 Divide
Configuration1
Fan 2 Setting
Configuration
Configuration
REGISTER
High Byte
High Byte
Low Byte
Low Byte
Gain 2
NAME
Count
Fan 2
Fan 2
Drive
Drive
Table 5.1 EMC2303 Register Set (continued)
Stores the number of Tach counts used
Holds the target tachometer reading low
Holds the tachometer reading high byte
Algorithm is disabled, allows direct user
Holds the gain terms used by the RPM-
based Fan Speed Control Algorithm for
based Fan Speed Control Algorithm for
must match the target fan speed at full
Sets configuration values for the RPM-
to determine how the actual fan speed
Holds the tachometer reading low byte
Sets additional configuration values for
Sets the maximum change per update
Sets the maximum change per update
Sets the configuration values for Spin
Sets the configuration values for Spin
Sets the minimum drive value for the
Sets the minimum drive value for the
Holds the target tachometer reading
Always displays the most recent fan
indicates Fan 1 is spinning properly
driver input setting for Fan 2. If the
Holds the tachometer reading that
Stores the divide ratio to set the
RPM-based Fan Speed Control
Up Routine of the Fan 2 driver
Up Routine of the Fan 1driver
Fan 2 Control Registers
control of the fan driver.
DATASHEET
frequency for Fan 2
for the Fan 1 driver
high byte for Fan 1
the Fan 2 driver
byte for Fan 1
Fan 1 driver
Fan 2 driver
FUNCTION
scale drive
for Fan 1
for Fan 1
for Fan 2
Fan 2
Fan 2
26
Multiple RPM-Based PWM Fan Controller for Three Fans
DEFAULT
VALUE
(40%)
(40%)
2Bh
2Ah
19h
10h
66h
F5h
00h
00h
F8h
FFh
FFh
F8h
00h
01h
28h
19h
10h
66h
LOCK
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
SWL
No
No
No
No
No
No
No
SMSC EMC2303
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Datasheet
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