EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 35

• 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
33h
43h
53h
Multiple RPM-Based PWM Fan Controller for Three Fans
Datasheet
SMSC EMC2303
5.10
R/W
R/W
R/W
R/W
2
1
1
1
Configuration 2
Configuration 2
Configuration 2
REGISTER
The Fan Configuration 2 register control the tachometer measurement and advanced features of the
RPM-based Fan Speed Control Algorithm.
Bit 6 - EN_RRCx - Enables ramp rate control when the corresponding fan driver is operated in the
Direct Setting Mode.
Bit 5 - GLITCH_ENx - Disables the low pass glitch filter that removes high frequency noise injected
on the TACHx pin.
Bits 4 - 3 - DER_OPTx[1:0] - Control some of the advanced options that affect the derivative portion
of the RPM-based Fan Speed Control Algorithm as shown in
Fan Configuration 2 Registers
Fan 1
Fan 2
Fan 3
‘0’ (default) - Ramp rate control is disabled. When the fan driver is operating in Direct Setting mode,
the fan setting will instantly transition to the next programmed setting.
‘1’ - Ramp rate control is enabled. When the fan driver is operating in Direct Setting mode, the fan
drive setting will follow the ramp rate controls as determined by the Fan Step and Update Time
settings. The maximum fan drive setting step is capped at the Fan Step setting and is updated
based on the Update Time as given by
‘0’ - The glitch filter is disabled.
‘1’ (default) - The glitch filter is enabled.
UPDATEX[2:0]
B7
-
-
-
1
0
1
1
Table 5.14 Fan Configuration 2 Registers
Table 5.13 Update Time (continued)
RRC1
RRC2
RRC3
EN_
EN_
EN_
B6
DATASHEET
GLITCH_
GLITCH_
GLITCH_
EN1
EN2
EN3
B5
35
Table
0
1
0
1
5.13.
DER_OPT1 [1:0]
DER_OPT2 [1:0]
DER_OPT3 [1:0]
B4
Table
B3
5.15.
ERR_RNG1[1:0]
ERR_RNG2[1:0]
ERR_RNG3[1:0]
UPDATE TIME
B2
1200ms
1600ms
800ms
Revision 1.2 (03-22-10)
B1
B0
-
-
-
DEFAULT
28h
28h
28h