EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 47

• 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

Determining T
The following example shows how different T
settings can be applied to three thermal zones. In this example,
the following T
This example uses the mux configuration described in the
Step 2: Configuring the Mux section, with the ADT7467
connected as shown in Figure 56. Both CPU temperature and
VRM temperature drive the CPU fan connected to PWM1.
Ambient temperature drives the front chassis fan and the rear
chassis fan connected to PWM2 and PWM3. The front chassis
fan is configured to run at PWM
is configured to run at PWM
configured to run at PWM
4-Wire Fans
The control range for 4-wire fans is much wider than that of
2-wire or 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20%.
Figure 65. T
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
T
T
T
0
0
RANGE
RANGE
RANGE
RANGE
= 80°C for ambient temperature
= 53.3°C for CPU temperature
= 40°C for VRM temperature
20
20
RANGE
and Percentage of Fan Speed Slopes with PWM
RANGE
TEMPERATURE ABOVE T
TEMPERATURE ABOVE T
40
40
values apply:
for Each Temperature Channel
MIN
60
60
MIN
= 10%.
= 30%. The CPU fan is
MIN
80
80
= 20%; the rear chassis fan
MIN
MIN
100
100
MIN
and T
120
120
Rev. 3 | Page 47 of 77 | www.onsemi.com
MIN
RANGE
2°C
2.5°C
3.33°C
4°C
5°C
6.67°C
8°C
10°C
13.3°C
16°C
20°C
26.6°C
32°C
40°C
53.3°C
80°C
2°C
2.5°C
3.33°C
4°C
5°C
6.67°C
8°C
10°C
13.3°C
16°C
20°C
26.6°C
32°C
40°C
53.3°C
80°C
= 20%
STEP 7: T
T
temperature channel. Above this temperature, a component
such as the CPU or VRM might be operating beyond its safe
operating limit. When the temperature measured exceeds
T
to provide critical system cooling.
The fans remain running at 100% until the temperature drops
below T
programmed into the Hysteresis Registers 0x6D and 0x6E. The
default hysteresis value is 4°C.
The T
operating temperature of the system. Because exceeding any
T
acoustic effects. Ultimately, this limit should be set up as a fail-
safe, and users should ensure that it is not exceeded under
normal system operating conditions.
Figure 66. T
THERM
THERM
THERM
100
100
THERM
, all fans are driven at 100% PWM duty cycle (full speed)
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
is the absolute maximum temperature allowed on a
limit runs all fans at 100%, it has significant negative
0
0
THERM
0
0
RANGE
THERM
limit should be considered the maximum worst-case
10
10
minus hysteresis, where hysteresis is the number
and Percentage of Fan Speed Slopes for VRM, Ambient, and
20
20
FOR TEMPERATURE CHANNELS
CPU Temperature Channels
TEMPERATURE ABOVE T
TEMPERATURE ABOVE T
30
30
40
40
50
50
60
60
70
MIN
70
MIN
80
80
ADT7467
90
90
100
100