emc2103-3-kp-tr Standard Microsystems Corp., emc2103-3-kp-tr Datasheet - Page 58

• Manufacturer Part Number: emc2103-3-kp-tr
• Description: Emc2103 Rpm-based Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

Revision 0.88 (06-30-08)
6.24
ADDR
45h
R/W
R/W
options disable the ramp rate control maximum step settings. To take advantage of the full ramp rate
control, limit derivative options to the disabled or basic derivative settings.
Bit 2 - 1 - ERR_RNG[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.
The Fan Configuration 2 Register is Software Locked.
Gain Register
1
0
0
1
1
1
0
0
1
1
Gain Register
ERR_RNG[1:0]
DER_OPT[1:0]
REGISTER
Table 6.36 Error Range Options
B7
Table 6.35 Derivative Options
-
Table 6.37 Gain Register
0
0
1
0
1
0
0
1
0
1
DATASHEET
B6
-
58
GAIND[1:0]
B5
B4
are used effectively causing the derivative term to
Basic derivative. The derivative of the error from
Both the basic derivative and the step derivative
the current drive setting and the target is added
the current drive setting and the target is added
Step derivative. The derivative of the error from
to the iterative Fan Drive setting (in addition to
RPM-Based Fan Controller with HW Thermal Shutdown
have double the effect of the derivative term
capped by the maximum Fan Step Register
to the iterative Fan Drive setting and is not
B3
GAINI[1:0]
proportional and integral terms)
No derivative terms used
B2
0 RPM (default)
OPERATION
OPERATION
100 RPM
200 RPM
(default).
50 RPM
setting.
GAINP[1:0]
B1
B0
SMSC EMC2103
DEFAULT
Datasheet
2Ah