EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 49

• 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 8: T
T
temperature measured drops below T
off. The premise for temperature hysteresis (T
without it, the fan would merely chatter or cycle on and off
repeatedly whenever the temperature hovered near the T
setting.
The T
system to cool down or heat up as the fan turns on and off.
Values of hysteresis are programmable in the range 1°C to 15°C.
Larger values of T
off. The T
The T
for fan on/off, but also is used for the T
as described in Step 6: T
fore, programming Register 0x6D and Register 0x6E sets the
hysteresis for both fan on/off and the THERM function.
HYST
is the amount of extra cooling a fan provides after the
HYST
HYST
HYST
value determines the amount of time needed for the
setting not only applies to the temperature hysteresis
HYST
default value is set at 4°C.
AMBIENT TEMP
FOR TEMPERATURE CHANNELS
REMOTE 2 =
REMOTE 1 =
HYST
VRM TEMP
CPU TEMP
LOCAL =
100%
prevent the fans from chattering on and
0%
RANGE
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
for Temperature Channels. There-
T
T
T
T
MIN
MIN
MIN
MIN
Figure 68. The T
MIN
THERM
before the fan turns
T
RANGE
T
T
T
hysteresis value,
RANGE
RANGE
RANGE
HYST
T
HYST
100%
100%
100%
) is that,
THERM
0%
0%
0%
Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
Rev. 3 | Page 49 of 77 | www.onsemi.com
MIN
MUX
PWM
PWM
PWM
MIN
MIN
MIN
Hysteresis Registers
Register 0x6D, Remote 1 and local hysteresis register
<7:4>, Remote 1 temperature hysteresis (4°C default)
<3:0>, local temperature hysteresis (4°C default)
Register 0x6E, Remote 2 temperature hysteresis register
<7:4>, Remote 2 temperature hysteresis (4°C default)
In some applications, it is required that fans continue to run at
PWM
below T
(0x62) allow the fans to be either turned off or kept spinning
below T
effect on the fan when the temperature drops below T
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
TACHOMETER 2
ENHANCEMENT)
MEASUREMENT
MEASUREMENT
TACHOMETER 3
MEASUREMENT
MIN
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
MIN
MIN
, instead of turning off when the temperature drops
RAMP
RAMP
AND 4
RAMP
. Bits <7:5> of Enhanced Acoustics Register 1
. If the fans are always on, the T
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
HYST
value has no
ADT7467
MIN
.