- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄15791 > ADM1024EVB (ON Semiconductor)BOARD EVAL FOR ADM1024 PDF資料下載
參數(shù)資料
| 型號： | ADM1024EVB |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADM1024 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 其它名稱： | EVAL-ADM1024EB EVAL-ADM1024EB-ND |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
ADM1024
http://onsemi.com
14
Table 8. TEMPERATURE DATA FORMAT
Temperature
Digital Output
128C
1000 0000
125C
1000 0011
100C
1001 1100
75C
1011 0101
50C
1100 1110
25C
1110 0111
0C
0000 0000
+0.5C
0000 0000
+10C
0000 1010
+25C
0001 1001
+50C
0011 0010
+75C
0100 1011
+100C
0110 0100
+125C
0111 1101
+127C
0111 1111
Layout Considerations
Digital boards can be electrically noisy environments, and
care must be taken to protect the analog inputs from noise,
particularly when measuring the very small voltages from a
remote diode sensor. The following precautions should be
taken:
1. Place the ADM1024 as close as possible to the
remote sensing diode. Provided that the worst
noise sources such as clock generators,
data/address buses, and CRTs are avoided, this
distance can be 4 inches to 8 inches.
2. Route the D+ and D tracks close together, in
parallel, with grounded guard tracks on each side.
Provide a ground plane under the tracks if
possible.
3. Use wide tracks to minimize inductance and
reduce noise pickup. A 10 mil track minimum
width and spacing is recommended.
Figure 18. Arrangement of Signal Tracks
10MIL
GND
D+
GND
D–
10MIL
4. Try to minimize the number of copper/solder joints,
which can cause thermocouple effects. Where
copper/solder joints are used, make sure that they
are in both the D+ and D– path and at the same
temperature. Thermocouple effects should not be a
major problem as 1C corresponds to about 240
mV,
and thermocouple voltages are about 3
mV/C of
temperature difference. Unless there are two
thermocouples with a big temperature differential
between them, thermocouple voltages should be
much less than 200 mV.
5. Place 0.1
mF bypass and 2200 pF input filter
capacitors close to the ADM1024.
6. If the distance to the remote sensor is more than
8 inches, the use of twisted pair cable is
recommended. This will work up to about 6 feet to
12 feet.
7. For really long distances (up to 100 feet) use
shielded twisted pair such as Belden #8451
microphone cable. Connect the twisted pair to D+
and D– and the shield to GND close to the
ADM1024. Leave the remote end of the shield
unconnected to avoid ground loops.
Because the measurement technique uses switched
current sources, excessive cable and/or filter capacitance
can affect the measurement. When using long cables, the
filter capacitor may be reduced or removed.
Cable resistance can also introduce errors. A 1
W series
resistance introduces about 0.5C error.
Limit Values
Limit values for analog measurements are stored in the
appropriate limit registers. In the case of voltage
measurements, high and low limits can be stored so that an
interrupt request will be generated if the measured value
goes above or below acceptable values. In the case of
temperature, a Hot Temperature or High Limit can be
programmed, and a Hot Temperature Hysteresis or Low
Limit, which will usually be some degrees lower. This can
be useful as it allows the system to be shut down when the
hot limit is exceeded, and restarted automatically when it has
cooled down to a safe temperature.
Monitoring Cycle Time
The monitoring cycle begins when a 1 is written to the
Start Bit (Bit 0), and a 0 to the INT_Clear Bit (Bit 3) of the
Configuration Register. INT_Enable (Bit 1) should be set to
1 to enable the INT output. The ADC measures each analog
input in turn; as each measurement is completed, the result
is automatically stored in the appropriate value register. This
“round robin” monitoring cycle continues until it is disabled
by writing a 0 to Bit 0 of the Configuration Register.
As the ADC will normally be left to free-run in this
manner, the time taken to monitor all the analog inputs will
normally not be of interest, as the most recently measured
value of any input can be read out at any time.
For applications where the monitoring cycle time is
important, it can be calculated as follows:
(eq. 6)
m
t1 ) n t2
where:
m the number of inputs configured as analog inputs, plus the
internal VCC measurement and internal temperature sensor.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISC1210ERR82J | INDUCTOR WW 820NH 5% 1210 |
| ISC1210ERR68J | INDUCTOR WW 680NH 5% 1210 |
| ISC1210ERR56J | INDUCTOR WW 560NH 5% 1210 |
| MAX6439UTPSRD7+T | IC BATTERY MON SNGL SOT23-6 |
| MAX6439UTPSWD7+T | IC BATTERY MON SNGL SOT23-6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1025 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost PC Hardware Monitor ASIC |
| ADM1025A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost PC Hardware Monitor ASIC |
| ADM1025AARQ | 功能描述:IC MONITOR SYS/VOLT 5CH 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| ADM1025AARQ-REEL | 制造商:Rochester Electronics LLC 功能描述:PC HARDWARE MONITOR I.C. - Tape and Reel |
| ADM1025AARQZ | 功能描述:IC MONITOR SYS/VOLT 5CH 16QSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。