EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 37

• 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
36h
46h
56h
Multiple RPM-Based PWM Fan Controller for Three Fans
Datasheet
SMSC EMC2303
5.12
R/W
R/W
R/W
R/W
GAIND OR GAINP OR GAINI [1:0]
The Gain registers store the gain terms used by the proportional and integral portions of each of the
RPM-based Fan Speed Control Algorithms. These gain terms are used as the KD, KI, and KP gain
terms in a classic PID control solution.
Bits 5 - 4 - GAINDX[1:0] - Controls the derivative gain term used by the FSC algorithm as shown in
Table
Bits 3-2 - GAINIX[1:0] - Controls the integral gain term used by the FSC algorithm as shown in
Table
Bits 1-0 - GAINP[1:0] - Controls the proportional gain term used by the FSC algorithm as shown in
Table
1
0
0
1
1
The Fan Spin Up Configuration registers control the settings of Spin Up Routine. The Fan Spin Up
Configuration registers are software locked.
Bit 7 - 6 - DRIVE_FAIL_CNTx[1:0] - Determines how many update cycles are used for the Drive Fail
detection function as shown in
the desired tach target.
Fan Spin Up Configuration Registers
Fan 1 Spin Up
Fan 2 Spin up
Fan 3 Spin up
Configuration
Configuration
Configuration
REGISTER
5.18.
5.18.
5.18.
Table 5.19 Fan Spin Up Configuration Registers
DRIVE_FAIL_
DRIVE_FAIL_
DRIVE_FAIL_
B7
CNT1 [1:0]
CNT2 [1:0]
CNT3 [1:0]
0
0
1
0
1
B6
Table 5.18 Gain Decode
Table
DATASHEET
5.20. This circuitry determines whether the fan can be driven to
NOKICK1
NOKICK2
NOKICK3
B5
37
B4
SPIN_LVL1[2:0]
SPIN_LVL2[2:0]
SPIN_LVL3[2:0]
RESPECTIVE GAIN FACTOR
B3
4x (default)
B2
1x
2x
8x
SPINUP_TIME
SPINUP_TIME
SPINUP_TIME
B1
Revision 1.2 (03-22-10)
1 [1:0]
2 [1:0]
3[1:0]
B0
DEFAULT
19h
19h
19h