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參數資料
| 型號： | ADM1030 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:66; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:19-35 |
| 中文描述： | 智能溫度監視器和PWM風扇控制器 |
| 文件頁數： | 9/28頁 |
| 文件大小： | 278K |
| 代理商： | ADM1030 |
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REV. 0
ADM1030
–9–
ALERT RESPONSE ADDRESS
Alert Response Address (ARA) is a feature of SMBus devices
that allows an interrupting device to identify itself to the host
when multiple devices exist on the same bus.
The
INT
output can be used as an interrupt output or can be used
as an
SMBALERT
. One or more
INT
outputs can be connected
to a common
SMBALERT
line connected to the master. If a
device’s
INT
line goes low, the following procedure occurs:
1.
SMBALERT
pulled low.
2. Master initiates a read operation and sends the Alert
Response Address (ARA = 0001 100). This is a general call
address that must not be used as a specific device address.
3. The device whose
INT
output is low responds to the Alert
Response Address, and the master reads its device address.
The address of the device is now known and can be interro-
gated in the usual way.
4. If more than one device’s
INT
output is low, the one with
the lowest device address will have priority, in accordance
with normal SMBus arbitration.
5. Once the ADM1030 has responded to the Alert Response
Address, it will reset its
INT
output; however, if the error
condition that caused the interrupt persists,
INT
will be
reasserted on the next monitoring cycle.
TEMPERATURE MEASUREMENT SYSTEM
Internal Temperature Measurement
The ADM1030 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 10-bit two’s
complement format. The resolution of the local temperature
sensor is 0.25
°
C. The format of the temperature data is shown
in Table II.
External Temperature Measurement
The ADM1030 can measure the temperature of an external
diode sensor or diode-connected transistor, connected to Pins
9 and 10.
These pins are a dedicated temperature input channel. The
function of Pin 7 is as a
THERM
input/output and is used to
flag overtemperature conditions.
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
calibration is required to null this out, so the technique is
unsuitable for mass production.
The technique used in the ADM1030 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 3 shows the input signal conditioning used to measure
the output of an external temperature sensor. This figure shows
the external sensor as a substrate transistor, provided for tempera-
ture monitoring on some microprocessors, but it could equally
well be a discrete transistor.
LOW-PASS
FILTER
f
C
= 65kHz
BIAS
DIODE
REMOTE
SENSING
TRANSISTOR
I
N I
I
BIAS
D+
D
–
V
OUT+
V
OUT
–
TO
ADC
V
DD
Figure 3. Signal Conditioning
If a discrete transistor is used, the collector will not be grounded,
and should be linked to the base. If a PNP transistor is used, the
base is connected to the D– input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D– input and the base to the D+ input.
One LSB of the ADC corresponds to 0.125
°
C, so the ADM1030
can theoretically measure temperatures from –127
°
C to +127.75
°
C,
although –127
°
C is outside the operating range for the device.
The extended temperature resolution data format is shown in
Tables III and IV.
Table II. Temperature Data Format (Local Temperature and
Remote Temperature High Bytes)
Temperature ( C)
–128
°
C
–125
°
C
–100
°
C
–75
°
C
–50
°
C
–25
°
C
–1
°
C
0
°
C
+1
°
C
+10
°
C
+25
°
C
+50
°
C
+75
°
C
+100
°
C
+125
°
C
+127
°
C
Digital Output
1000 0000
1000 0011
1001 1100
1011 0101
1100 1110
1110 0111
1111 1111
0000 0000
0000 0001
0000 1010
0001 1001
0011 0010
0100 1011
0110 0100
0111 1101
0111 1111
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| ADM1030ARQ | 功能描述:IC SNSR TEMP/FAN PWM CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監控系統（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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