EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 43

• Manufacturer Part Number: EVAL-ADT7467EBZ
• Description: BOARD EVALUATION FOR ADT7467
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of EVAL-ADT7467EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1.5°C
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7467
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STEP 4: PWM
PWM
the system runs. It is also the start speed for each fan in
automatic fan control mode when the temperature rises above
T
as low as possible. Depending on the fan used, the PWM
setting is usually in the 20% to 33% duty cycle range. This value
can be found through fan validation.
MIN
. For maximum system acoustic benefit, PWM
MIN
Figure 58. PWM
PWM
is the minimum PWM duty cycle at which each fan in
100%
MIN
0%
MIN
AMBIENT TEMP
REMOTE 2 =
REMOTE 1 =
FOR PWM (FAN) OUTPUTS
VRM TEMP
CPU TEMP
MIN
LOCAL =
T
100%
Determines Minimum PWM Duty Cycle
MIN
0%
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
T
MIN
MIN
MIN
MIN
TEMPERATURE
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
Figure 57. Understanding the T
MIN
0%
0%
0%
Rev. 3 | Page 43 of 77 | www.onsemi.com
should be
MIN
MUX
PWM
PWM
PWM
MIN
MIN
MIN
More than one PWM output can be controlled from a single
temperature measurement channel. For example, Remote 1
temperature can control PWM1 and PWM2 outputs. If two fans
are used on PWM1 and PWM2, each fan’s characteristics can be
set up differently. As a result, Fan 1 driven by PWM1 can have
a different PWM
In Figure 59, PWM1
duty cycle of 20%, and PWM2
mum of 40% duty cycle; however, both fans turn on at the same
temperature, defined by T
MIN
Figure 59. Operating Two Fans from a Single Temperature Channel
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
ENHANCEMENT)
TACHOMETER 3
MEASUREMENT
Parameter
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
PWM2
PWM1
RAMP
RAMP
RAMP
AND 4
100%
MIN
MIN
0%
MIN
value than that of Fan 2 connected to PWM2.
GENERATOR
GENERATOR
GENERATOR
MIN
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
T
(front fan) is turned on at a minimum
MIN
MIN
.
MIN
(rear fan) turns on at a mini-
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
TEMPERATURE
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK
ADT7467