EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 36

• 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

ADDR
35h
45h
55h
Revision 1.2 (03-22-10)
5.11
R/W
R/W
R/W
R/W
Bit 2 - 1 - ERR_RNGx[1:0] - Control some of the advanced options that affect the error window. When
the measured fan speed is within the programmed error window around the target speed, then the fan
drive setting is not updated. The algorithm will continue to monitor the fan speed and calculate
necessary drive setting changes based on the error; however, these changes are ignored.
Gain Registers
1
0
0
1
1
1
0
0
1
1
REGISTER
Register
Register
Register
ERR_RNGX[1:0]
DER_OPTX[1:0]
Gain 1
Gain 2
Gain 3
B7
-
-
-
Table 5.16 Error Range Options
Table 5.15 Derivative Options
Table 5.17 Gain Registers
0
0
1
0
1
0
0
1
0
1
B6
DATASHEET
-
-
-
GAIND1[1:0]
GAIND2[1:0]
GAIND3[1:0]
36
B5
are used effectively causing the derivative term to
Basic derivative. The derivative of the error from
to the iterative Fan Drive Register setting and is
Both the basic derivative and the step derivative
B4
the current drive setting and the target is added
the current drive setting and the target is added
Multiple RPM-Based PWM Fan Controller for Three Fans
Step derivative. The derivative of the error from
have double the effect of the derivative term.
to the iterative Fan Drive Register setting (in
addition to proportional and integral terms)
not capped by the Fan Step Register.
B3
GAINI1[1:0]
GAINI2[1:0]
GAINI3[1:0]
No derivative options used
0 RPM (default)
B2
OPERATION
OPERATION
100 RPM
200 RPM
(default)
50 RPM
GAINP1[1:0]
GAINP2[1:0]
GAINP3[1:0]
B1
B0
SMSC EMC2303
Datasheet
DEFAULT
2Ah
2Ah
2Ah