EMC6D102_07 Datasheet, PDF (80/86 Pages) SMSC Corporation – Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features
Datasheet
Chapter 9 Timing Diagrams
9.1 PWM Outputs
The following section shows the timing for the PWM[1:3] outputs.
FANx
t1
t2
Figure 9.1 PWMx Output Timing
NAME
t1
t2
Table 9.1 Timing for PWM[1:3] Outputs
DESCRIPTION
PWM Period (Note 9.1)
PWM High Time (Note 9.2)
MIN
TYP
11.4
0
MAX
90.9
99.6
UNITS
msec
%
Note 9.1 This value is programmable by the PWM frequency bits located in the FRFx registers.
Note 9.2
The PWM High Time is based on a percentage of the total PWM period (min=0/256*T_PWM,
max =255/256*T_PWM). During Spin-up the PWM High Time can reach a 100% or Full On.
(T_PWM = t1).
9.2 SMBus Interface
SCLK
SDAT
t BUF
P
S
tLOW
tR
t HD:STA
tHIGH
tF
tHD:DAT tSU:DAT
tHD:STA
tSU:STA
S
Figure 9.2 SMBus Timing
tSU:STO
P
Revision 0.4 (09-25-07)
80
DATASHEET
SMSC EMC6D102