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| 型號(hào)： | ADT7476ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT, MO-137AE, QSOP-24 |
| 文件頁(yè)數(shù)： | 46/72頁(yè) |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
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ADT7476
Rev. B | Page 50 of 72
STEP 8: THYST FOR TEMPERATURE CHANNELS
THYST is the amount of extra cooling a fan provides after the
temperature measured has dropped back below TMIN before the
fan turns off. The premise for temperature hysteresis (THYST) is
that, without it, the fan would merely chatter, or cycle on and
off regularly, whenever the temperature is hovering at about the
TMIN setting.
The THYST value chosen determines the amount of time needed
for the 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 THYST prevent the fans from chattering on
and off. The THYST default value is set at 4°C.
The THYST setting applies not only to the temperature hysteresis
for fan on/off but also to the TTHERM hysteresis value, described
in Step 7. Therefore, programming Register 0x6D and Register
0x6E sets the hysteresis for both fan on/off and the THERM
function.
In some applications, it is required that fans not turn off below
TMIN but remain running at PWMMIN. Bits [7:5] of Enhanced
Acoustics Register 1 (0x62) allow the fans to be turned off or to
be kept spinning below TMIN. If the fans are always on, the THYST
value has no effect on the fan when the temperature drops
below TMIN.
THERM Hysteresis
Any hysteresis programmed via Register 0x6D and Register 0x6E
also applies to hysteresis on the appropriate THERM channel.
0
5382-
066
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
PWM
MIN
PWM
MIN
PWM
MIN
100%
TMIN
P
W
M
D
U
T
Y
C
Y
C
L
E
0%
100%
TRANGE
TTHERM
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
PWM
GENERATOR
PWM
CONFIG
PWM
CONFIG
PWM
CONFIG
Figure 65. The THYST Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
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| ADT7476EBZEVB | 功能描述:BOARD EVALUATION FOR ADT7476 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:dBCool® 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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