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| 型号： | ADT7473ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 46/73页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTLR 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 2,500 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±2.5% |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | ADT7473ARQZ-REEL-ND ADT7473ARQZ-REELOSTR |
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ADT7473
2. As the temperature in that zone (Remote 1
temperature) rises toward and exceeds the
operating point temperature, T MIN is reduced, and
the fan speed increases.
3. As the temperature drops below the operating
point temperature, T MIN is increased, and the fan
speed is reduced.
However, the loop operation is not as simple as described
in these steps. A number of conditions govern the situations
in which T MIN can increase or decrease.
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
PREVIOUS
TEMPERATURE
MEASUREMENT
T1 (n ? 1)
WAIT n
MONITORING
CYCLES
IS T1(n) >
(OP1 ? HYS)
YES
IS T1(n) ? T1(n ? 1)
≤ 0.25 5 C
NO
NO
YES
DO NOTHING
DO NOTHING
(SYSTEM IS
COOLING OFF
FOR CONSTANT)
Short Cycle and Long Cycle
The ADT7473/ADT7473 ? 1 implements two loops: a
short cycle and a long cycle. The short cycle takes place
IS T1(n) - T1(n - 1) = 0.5 - 0.75 5 C
IS T1(n) - T1(n - 1) = 1.0 - 1.75 5 C
IS T1(n) - T1(n - 1) > 2.0 5 C
DECREASE T MIN BY 1 5 C
DECREASE T MIN BY 2 5 C
DECREASE T MIN BY 4 5 C
every n monitoring cycles. The long cycle takes place every
2n monitoring cycles. The value of n is programmable for
each temperature channel. The bits are located at the
following register locations:
Remote 1 = CYR1 = Bits <2:0> of Dynamic T MIN Control
Register 2 (0x37).
Figure 68. Short Cycle Steps
Figure 69 shows the steps taken during the long cycle.
WAIT 2n
MONITORING
CYCLES
Local = CYL = Bits <5:3> of Dynamic T MIN Control
Register 2 (0x37).
Remote 2 = CYR2 = Bits <7:6> of Dynamic T MIN Control
Register 2 (0x37) and Bit 0 of Dynamic T MIN Control
Register 1 (0x36).
CURRENT
TEMPERATURE
MEASUREMENT
T1(n)
OPERATING
POINT
TEMPERATURE
OP1
IS T1(n) > OP1
NO
YES
DECREASE T MIN
BY 1 5 C
Table 52. CYCLE BI T ASSIGNMENTS
Code Short Cycle Secs Long Cycle
000 8 cycles 1 sec 16 cycles
001 16 cycles 2 sec 32 cycles
010 32 cycles 4 sec 64 cycles
Secs
2 sec
4 sec
8 sec
IS T1(n) < LOW TEMP LIMIT
AND
T MIN < HIGH TEMP LIMIT
AND
T MIN < OP1
AND
T1(n) > T MIN
NO
YES
INCREASE
T MIN BY 1 5 C
DO NOT
CHANGE
011
64 cycles
8 sec
128 cycles
16 sec
100
101
110
111
128 cycles
256 cycles
512 cycles
1024 cycles
16 sec
32 sec
64 sec
128 sec
256 cycles
512 cycles
1024 cycles
2048 cycles
32 sec
64 sec
128 sec
256 sec
Figure 69. Long Cycle Steps
The following examples illustrate some of the
circumstances that might cause T MIN to increase, decrease,
or stay the same.
Care should be taken when choosing the cycle time. A
long cycle time means that T MIN is updated less often. If
your system has very fast temperature transients, the
dynamic T MIN control loop is always lagging. If a cycle time
is chosen that is too fast, the full benefit of changing T MIN
might not be realized and needs to change again on the next
cycle; in effect, it is overshooting. It is necessary to carry out
some calibration to identify the most suitable response time.
Example 1: Normal Operation ? No T MIN Adjustment
? If measured temperature never exceeds the
programmed operating point minus the hysteresis
temperature, then T MIN is not adjusted; that is, it
remains at its current setting.
? If measured temperature never drops below the low
temperature limit, then T MIN is not adjusted.
Figure 68 shows the steps taken during the short cycle.
http://onsemi.com
46
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相关代理商/技术参数 |
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|---|---|
| ADT7473ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7473ARQZ-RL7 | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473EBZEVB | 功能描述:EVALUATION BOARD ADT7473 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
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| ADT7475 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Monitor and Fan Controller |
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