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參數(shù)資料
| 型號(hào)： | ADM1022ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Cost PC Temperature Monitor and Fan Control ASIC |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁(yè)數(shù)： | 9/19頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | ADM1022ARQ |
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REV. 0
ADM1022
–9–
R/
W
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1022
START BY
MASTER
1
9
1
ACK. BY
ADM1022
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1022
STOP BY
MASTER
1
9
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
Figure 11a. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
R/
W
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1022
START BY
MASTER
1
9
1
ACK. BY
ADM1022
9
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
Figure 11b. Writing to the Address Pointer Register Only
R/
W
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK.
BY MASTER
START BY
MASTER
1
9
1
ACK. BY
ADM1022
9
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1022
STOP BY
MASTER
Figure 11c. Reading Data from a Previously Selected Register
TEMPERATURE MEASUREMENT SYSTEM
Internal Temperature Measurement
The ADM1022 contains an on-chip bandgap temperature sen-
sor. The on-chip ADC performs conversions on the output of
this sensor and outputs the temperature data in 8-bit twos comple-
ment format. The format of the temperature data is shown in
Table II.
External Temperature Measurement
The ADM1022 can measure the temperature of two external
diode sensors or diode-connected transistors, connected to Pins
9 and 10 or 11 and 12.
Pins 9 and 10 are a dedicated temperature input channel. The
default function of Pins 11 and 12 is the
THERM
input/output
and a general purpose logic input (GPI), but they can be config-
ured to measure a diode sensor by setting Bit 7 of the Configu-
ration Register to 1.
The forward voltage of a diode or diode-connected transistor,
operated at a constant current, exhibits a negative temperature
coefficient of about –2 mV/
°
C. Unfortunately, the absolute value
of V
BE
, varies from device to device, and individual calibra-
tion is required to null this out, so the technique is unsuitable
for mass-production.
The technique used in the ADM1022 is to measure the change
in V
BE
when the device is operated at two different currents.
This is given by:
V
BE
=
KT/q
×
ln(
N
)
where:
K
is Boltzmann’s constant
q
is charge on the carrier
T
is absolute temperature in Kelvins
N
is ratio of the two currents
Figure 12 shows the input signal conditioning used to mea-
sure the output of an external temperature sensor. This figure
shows the external sensor as a substrate transistor, provided
for temperature monitoring on some microprocessors, but it
could equally well be a discrete transistor.
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| ADM1022ARQ-REEL | 功能描述:IC SENSOR TEMP/DET 3/5.5V 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| ADM1022ARQ-REEL7 | 功能描述:IC SENSOR TEMP/DET 3/5.5V 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| ADM1022ARQZ | 功能描述:IC SENSOR TEMP/DET 3/5.5V 16QSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| ADM1022ARQZ-R7 | 功能描述:IC SENSOR TEMP/DET 3/5.5V 16QSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| ADM1022ARQZ-REEL | 功能描述:IC SENSOR TEMP/DET 3/5.5V 16QSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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