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參數(shù)資料
| 型號(hào)： | ADT7482ARMZ-RL |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-187-BA, MSOP-10 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 335K |
| 代理商： | ADT7482ARMZ-RL |
ADT7482
Rev. 1 | Page 20 of 24 | www.onsemi.com
THERM is intended as a fail-safe interrupt output that cannot
be masked.
If the Remote 1, Remote 2, or local temperature exceeds the
programmed high temperature limits, or equals or exceeds the
low temperature limits, the ALERT output is asserted low. An
open-circuit fault on the remote diode also causes ALERT to
assert. ALERT is reset when serviced by a master reading its
device address, provided the error condition has gone away, and
the status register has been reset.
The THERM output asserts low if the Remote 1, Remote 2, or
local temperature exceeds the programmed THERM limits. The
THERM temperature limits should normally be equal to or
greater than the high temperature limits. THERM is reset
automatically when the temperature falls back within the
(THERM hysteresis) limit. The local and remote THERM
limits are set by default to 85°C. A hysteresis value can be
programmed, in which case, THERM resets when the
temperature falls to the limit value minus the hysteresis value.
This applies to both local and remote measurement channels.
The power-on hysteresis default value is 10°C, but this can be
reprogrammed to any value after power-up.
The hysteresis loop on the THERM outputs is useful when
THERM is used for on/off control of a fan. The system can be
set up so that when THERM asserts, a fan can be switched on to
cool the system. When THERM goes high again, the fan can be
switched off. Programming a hysteresis value protects from fan
jitter, where the temperature hovers around the THERM limit,
and the fan is constantly being switched on and off.
Table 17. THERM Hysteresis
THERM Hysteresis
Binary Representation
0°C
0 000 0000
1°C
0 000 0001
10°C
0 000 1010
If the ADT7482 is in the default temperature range (0°C to 127°C),
then THERM hysteresis must be less than the THERM limit.
Figure 21 shows how the THERM and ALERT outputs operate.
If desired, use the ALERT output as a SMBALERT to signal to
the host via the SMBus that the temperature has risen. Use the
THERM output to turn on a fan to cool the system, if the
temperature continues to increase. This method ensures that
there is a fail-safe mechanism to cool the system, without the
need for host intervention.
1
3
2
4
THERM LIMIT
HIGH TEMP LIMIT
THERM LIMIT-HYSTERESIS
RESET BY MASTER
ALERT
THERM
100°C
TEMPERATURE
90°C
80°C
70°C
60°C
50°C
40°C
06150-
021
Figure 21. Operation of the ALERT and THERM Interrupts
1.
If the measured temperature exceeds the high temperature
limit, the ALERT output asserts low.
2.
If the temperature continues to increase and exceeds the
THERM limit, the THERM output asserts low. This can be
used to throttle the CPU clock or switch on a fan.
3.
The THERM output de-asserts (goes high) when the
temperature falls to THERM limit minus hysteresis. In
Figure 21, the default hysteresis value of 10°C is shown.
4.
The ALERT output de-asserts only when the temperature
has fallen below the high temperature limit, and the master
has read the device address and cleared the status register.
Pin 8 on the ADT7482 can be configured as either an ALERT
output or as an additional THERM output. THERM2 asserts
low when the temperature exceeds the programmed local
and/or remote high temperature limits. It is reset in the same
manner as THERM, and it is not maskable. The programmed
hysteresis value applies to THERM2 also.
Figure 22 shows how THERM and THERM2 might operate
together to implement two methods of cooling the system. In
this example, the THERM2 limits are set lower than the
THERM limits. The THERM2 output could be used to turn on
a fan. If the temperature continues to rise and exceeds the
THERM limits, the THERM output could provide additional
cooling by throttling the CPU.
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| ADT7482ARMZ-RL7 | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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| ADT7483AARQZ-R7 | 功能描述:板上安裝溫度傳感器 2 TEMP DIODE MONITOR 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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