ADT7462ACPZ-5RL7 ON Semiconductor, ADT7462ACPZ-5RL7 Datasheet - Page 35

• Manufacturer Part Number: ADT7462ACPZ-5RL7
• Description: IC TEMP/VOLT MONITOR 32-LFCSP
• Manufacturer: ON Semiconductor

Specifications of ADT7462ACPZ-5RL7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-LFCSP
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADT7462ACPZ-500RL7; ADT7462ACPZ-500RL7; ADT7462ACPZ-500RL7TR; ADT7462ACPZ-500RL7TR; ADT7462ACPZ-5RL7TR

Step 3—PWM
fan in the system runs. It is also the start speed for each fan
under automatic fan control when the temperature rises
above T
PWM
fan used, the PWM
duty cycle range. This value can be found through fan
validation.
single temperature measurement channel. For example,
PWM
More than one PWM output can be controlled from a
MIN
Figure 54. PWM
MIN
PWM
MIN
should be as low as possible. Depending on the
AMBIENT TEMP
100%
is the minimum PWM duty cycle at which each
MIN
0%
. For maximum system acoustic benefit,
REMOTE 2 =
REMOTE 1 =
VRM TEMP
MIN
CPU TEMP
LOCAL =
100%
for Each PWM (Fan) Output
0%
MIN
PWM Duty Cycle
T
MIN
setting is usually in the 20% to 33%
MIN
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
T
MIN
Determines Minimum
MIN
MIN
MIN
TEMPERATURE
Figure 53. Understanding the T
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
MUX
http://onsemi.com
35
Remote 1 temperature can control PWM1 and PWM2
outputs. If two different fans are used on PWM1 and PWM2,
the fan characteristics can be set up differently. As a result,
Fan 1, driven by PWM1, can have a different PWM
value than that of Fan 2 connected to PWM2. Figure 55
illustrates this as PWM1
minimum duty cycle of 20%, while PWM2
turns on at a minimum duty cycle of 40%. Note, however,
that both fans turn on at exactly the same temperature,
defined by T
PWM
PWM
PWM
MIN
MIN
MIN
Figure 55. Operating Two Different Fans from a
MIN
ENHANCEMENT)
ENHANCEMENT)
MEASUREMENT
MEASUREMENT
ENHANCEMENT)
TACHOMETER 1
TACHOMETER 2
TACHOMETER 3
MEASUREMENT
PWM2
PWM1
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
Parameter
RAMP
RAMP
AND 4
RAMP
100%
MIN
MIN
MIN
0%
Single Temperature Channel
.
T
GENERATOR
GENERATOR
GENERATOR
MIN
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
MIN
PWM2
(the front fan) turns on at a
PWM1
TEMPERATURE
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
MIN
CPU FAN SINK
(the rear fan)
MIN