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參數資料
| 型號： | ADT7463ARQZ-REEL |
| 廠商： | ON Semiconductor |
| 文件頁數： | 19/50頁 |
| 文件大小： | 726K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 產品變化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 標準包裝： | 2,500 |
| 系列： | dBCool® |
| 功能： | 風扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | -40°C ~ 120°C，外部傳感器 |
| 精確度： | ±1.5°C（最小值） |
| 拓撲： | ADC，比較器，風扇速度計數器，多路復用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 120°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
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ADT7463
http://onsemi.com
19
Table 17. TEMPERATURE MEASUREMENT
REGISTERS
Register
Description
Default
0x25
Remote 1 Temperature
0x80
0x26
Local Temperature
0x80
0x27
Remote 2 Temperature
0x80
0x77
Extended Resolution 2
0x00
Table 18. EXTENDED RESOLUTION TEMPERATURE
MEASUREMENT REGISTER BITS (REG. 0X77)
Bit
Mnemonic
Description
<7:6>
TDM2
Remote 2 Temperature LSBs
<5:4>
LTMP
Local Temperature LSBs
<3:2>
TDM1
Remote 1 Temperature LSBs
Reading Temperature from the ADT7463
It is important to note that temperature can be read from
the ADT7463 as an 8bit value (with 1癈 resolution) or as
a 10bit value (with 0.25癈 resolution). If only 1癈
resolution is required, the temperature readings can be read
back at any time and in no particular order.
If the 10bit measurement is required, this involves a
2register read for each measurement. The extended
resolution register (Reg. 0x77) should be read first. This
causes all temperature reading registers to be frozen until all
temperature reading registers have been read from. This
prevents an MSB reading from being updated while its
2 LSBs are being read and vice versa.
Nulling Out Temperature Errors
As CPUs run faster, it is getting more difficult to avoid
high frequency clocks when routing the D+, D traces
around a system board. Even when recommended layout
guidelines are followed, there may still be temperature
errors attributed to noise being coupled onto the D+/D
lines. High frequency noise generally has the effect of giving
temperature measurements that are too high by a constant
amount. The ADT7463 has temperature offset registers at
Addresses 0x70, 0x72 for the Remote 1 and Remote 2
temperature channels. By doing a onetime calibration of
the system, one can determine the offset caused by system
board noise and null it out using the offset registers. The
offset registers automatically add a twos complement 8bit
reading to every temperature measurement. The LSBs add
0.25癈 offset to the temperature reading so the 8bit register
effectively allows temperature offsets of up to ?2癈 with
a resolution of 0.25癈. This ensures that the readings in the
temperature measurement registers are as accurate as
possible.
Table 19. TEMPERATURE OFFSET REGISTERS
Register
Description
Default
0x70
Remote 1 Temperature Offset
0x00 (0癈)
0x71
Local Temperature Offset
0x00 (0癈)
0x72
Remote 2 Temperature Offset
0x00 (0癈)
Temperature Measurement Limit Registers
Associated with each temperature measurement channel
are high and low limit registers. Exceeding the programmed
high or low limit causes the appropriate status bit to be set.
Exceeding either limit can also generate SMBALERT
interrupts.
Table 20. TEMPERATURE MEASUREMENT LIMIT
REGISTERS
Register
Description
Default
0x4E
Remote 1 Temperature Low Limit
0x81
0x4F
Remote 1 Temperature High Limit
0x7F
0x50
Local Temperature Low Limit
0x81
0x51
Local Temperature High Limit
0x7F
0x52
Remote 2 Temperature Low Limit
0x81
0x53
Remote 2 Temperature High Limit
0x7F
Overtemperature Events
Overtemperature events on any of the temperature
channels can be detected and dealt with automatically in
automatic fan speed control mode. Registers 0x6A to 0x6C
are the THERM
limits. When a temperature exceeds its
THERM
limit, all fans run at 100% duty cycle. The fans stay
running at 100% until the temperature drops below THERM
Hysteresis (this can be disabled by setting the boost bit in
Configuration Register 3, Bit 2, Register 0x78). The
hysteresis value for that THERM
limit is the value
programmed into Registers 0x6D, 0x6E (hysteresis
registers). The default hysteresis value is 4癈.
Figure 27. THERM
Limit Operation
THERM
LIMIT
TEMPERATURE
FANS
100%
HYSTERESIS (癈)
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| ADT7463ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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