EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 40

• 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

ADT7467
STEP 2: CONFIGURING THE MUX
After the system hardware configuration is determined, the fans
can be assigned to particular temperature channels. Not only
can fans be assigned to individual channels, but the behavior
of the fans is also configurable. For example, fans can run using
automatic fan control, can run manually (using software control),
or can run at the fastest speed calculated by multiple tempera-
ture channels. The mux is the bridge between temperature
measurement channels and the three PWM outputs.
Bits <7:5> (BHVR) of Register 0x5C, Register 0x5D, and
Register 0x5E (PWM configuration registers) control the
behavior of the fans connected to the PWM1, PWM2, and
PWM3 outputs. The values selected for these bits determine
how the mux connects a temperature measurement channel to a
PWM output.
Automatic Fan Control Mux Options
<7:5> (BHVR), Register 0x5C, Register 0x5D, and Register 0x5E
000 = Remote 1 temperature controls PWMx
001 = local temperature controls PWMx
AMBIENT TEMP
REMOTE 1 =
REMOTE 2 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
MIN
MIN
MIN
Figure 55. Assigning Temperature Channels to Fan Channels
T
T
T
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
Rev. 3 | Page 40 of 77 | www.onsemi.com
MUX
MUX
PWM
PWM
PWM
MIN
MIN
MIN
The fastest speed calculated option pertains to controlling one
PWM output based on multiple temperature channels. The
thermal characteristics of the three temperature zones can be
set to drive a single fan. An example would be the fan turning
on when the Remote 1 temperature exceeds 60°C or when the
local temperature exceeds 45°C.
Other Mux Options
<7:5> (BHVR), Register 0x5C, Register 0x5D, and Register 0x5E
010 = Remote 2 temperature controls PWMx
101 = fastest speed calculated by local and Remote 2
temperature controls PWMx
110 = fastest speed calculated by all three temperature
channels controls PWMx
011 = PWMx runs at full speed
100 = PWMx disabled (default)
111 = manual mode. PWMx is run using software control.
In this mode, PWM duty cycle registers (Register 0x30 to
Register 0x32) are writable and control the PWM outputs.
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
AND 4
GENERATOR
GENERATOR
GENERATOR
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK