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參數(shù)資料
| 型號： | ADT7463ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | dB COOL Remote Thermal Controller and Voltage Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | MO-137AE, QSOP-24 |
| 文件頁數(shù)： | 17/53頁 |
| 文件大?。?/td> | 719K |
| 代理商： | ADT7463ARQ |
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REV. 0
ADT7463
–17–
Temperature Measurement Registers
Reg. 0x25
Remote 1 Temperature
= 0x80 default
Reg. 0x26
Local Temperature
= 0x80 default
Reg. 0x27
Remote 2 Temperature
= 0x80 default
Reg. 0x77
Extended Resolution 2
= 0x00 default
<7:6> TDM2
= Remote 2 Temperature LSBs
<5:4> LTMP
= Local Temperature LSBs
<3:2> TDM1
= Remote 1 Temperature LSBs
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.
Reg. 0x4E
Remote 1 Temp Low Limit
= 0x81 default
Reg. 0x4F
Remote 1 Temp High Limit
= 0x7F default
Reg. 0x50
Local Temp Low Limit
= 0x81 default
Reg. 0x51
Local Temp High Limit
= 0x7F default
Reg. 0x52
Remote 2 Temp Low Limit
= 0x81 default
Reg. 0x53
Remote 2 Temp High Limit
= 0x7F default
Reading Temperature from the ADT7463
It is important to note that temperature can be read from the
ADT7463 as an 8-bit value (with 1
°
C resolution), or as a 10-bit
value (with 0.25
°
C resolution). If only 1
°
C resolution is
required, the temperature readings can be read back at any time
and in no particular order.
If the 10-bit measurement is required, this involves a 2-register
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 regis-
ters have been read from. This prevents an MSB reading from
being updated while its two LSBs are being read, and vice versa.
ADDITIONAL ADC FUNCTIONS
A number of other functions are available on the ADT7463 to
offer the systems designer increased flexibility:
Turn Off Averaging
For each temperature measurement read from a value register,
16 readings have actually been made internally and the results
averaged before being placed into the value register. Sometimes
it may be necessary to take a very fast measurement, e.g., of
CPU temperature. Setting Bit 4 of Configuration Register 2
(Reg. 0x73) turns averaging off. This takes a reading every 13 ms.
The measurement itself takes 4 ms.
Single-Channel ADC Conversions
Setting Bit 6 of Configuration Register 2 (Reg. 0x73) places the
ADT7463 into Single-Channel ADC Conversion Mode. In this
mode, the ADT7463 can be made to read a single temperature
channel only. If the internal ADT7463 clock is used, the
selected input will be read every 1.4 ms. The appropriate ADC
channel is selected by writing to Bits <7:5> of TACH1 Mini-
mum High Byte Register (0x55).
Bits <7:5> Reg 0x55
101
110
111
Channel Selected
Remote 1 Temp
Local Temp
Remote 2 Temp
Configuration Register 2 (Reg. 0x73)
<4> = 1
Averaging Off
<6> = 1
Single-Channel Convert Mode
TACH1 Minimum High Byte (Reg. 0x55)
<7:5>
Selects ADC Channel for Single-Channel Convert Mode
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–0x6C
are the
THERM
limits. When a temperature exceeds its
THERM
limit, all fans
will run at 100% duty cycle. The fans will 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
°
C.
FANS
THERM
LIMIT
TEMP
100%
HYSTERESIS ( C)
Figure 16.
THERM
Limit Operation
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| ADT7463ARQ-REEL | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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