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EMC2300 Datasheet(PDF) 74 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 74 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
74
SMSC EMC2300
DATASHEET
Table 8.54 PWM Option Register Bits
BIT
NAME
R/W DEFAULT
DESCRIPTION
0
UPDT0
R/W
0
Determines the update rate of tachometer circuits associated with this
PWM driver.
00 - once a second
01 - twice a second
1x - every 300msec.
1
UPDT1
R/W
0
2
SZEN
R/W
1
Snap to Zero - determines if the PWM output ramps down to 00hor if is
immediately set to 00h when the input is set to 00h.
‘0’ - Step down the PWM output to OFF at the programmed ramp rate.
‘1’ - Transition PWM output to OFF immediately when the duty cycle is
set to 00h.
3
GRD0
R/W
1
Sets the Guard time that the tachometer associated with this PWM driver
will wait after a transition from low to high before it begins measuring.
00 = 63 clocks (90kHz clock ~ 700us)
01 = 32 clocks (90kHz clock ~356us)
10 = 16 clocks (90kHz clock ~178us)
11 = 8 clocks (90kHz clock ~89us)
4
GRD1
R/W
0
5
OPP
R/W
0
Opportunistic Mode enable - when set, enables opportunistic mode. The
tachometer reading is updated any time a valid tachometer reading can
be made. If a valid reading is detected prior to the update cycle, then the
update counter is reset.
6
RES
R/W
0
Reserved
7
RES
R/W
0
Reserved
Table 8.55 PWM/TACH Test Register Bits
BIT
NAME
R/W DEFAULT
DESCRIPTION
0
glitch
R/W
1
is used to select the glitch suppression logic on the tachometer inputs
‘0’ TACH inputs are synchronized to 90kHz oscillator.
‘1’ TACH inputs are deglitched and synchronized to 90kHz oscillator
1
PSYNC1
R/W
0
Determine how each PWM outputs exit SpinUp.
‘0’ - Exit Spinup Asynchronously to the PWM duty cycle. The first PWM
period when SpinUP is terminate may be a partial period.
‘1’ - Exit Spinup at the beginning of the next PWM duty cycle period.
This option gets rid of the initial partial period created by exiting SpinUp,
but it extends the SpinUp time beyond the programmed limit.
2
PSYNC2
R/W
0
3
PSYNC3
R/W
0
4
ROVR
R/W
1
Determines the rollover value for mode 1 (all Tachs)
‘0’ 0080h - useful for simulation
‘1’ FFFFh
5
PWM1_256/
64
R/W
1
Scale the PWM duty cycle for the corresponding channel. When enabled,
will shift the PWM duty cycle down by 2 creating a duty cycle with a
resolution of 1/256. This allows the device to support higher PWM
frequencies
‘0’= 64 count PWM duty cycle - resolution is 1/64
‘1’ = 256 count PWM duty cycle
6
PWM2_256/
64
R/W
1
7
PWM3_256/
64
R/W
1


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