Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADM1021AARQZ-R Datasheet(PDF) 14 Page - ON Semiconductor

Part No. ADM1021AARQZ-R
Description  Low Cost Microprocessor System Temperature Monitor Microcomputer
Download  15 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo 

ADM1021AARQZ-R Datasheet(HTML) 14 Page - ON Semiconductor

 
Zoom Inzoom in Zoom Outzoom out
 14 / 15 page
background image
ADM1021A
http://onsemi.com
14
Where copper/solder joints are used, ensure they
are in both the D+ and D− paths and at the same
temperature.
Thermocouple effects should not be a major
problem as 1
°C 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 240
mV.
5. Place a 0.1
mF bypass capacitor close to the VDD
pin, and 2200 pF input filter capacitors across D+,
D− close to the ADM1021A.
6. If the distance to the remote sensor is more than
eight inches, the use of twisted pair cable is
recommended. This works up to about 6 to 12 feet.
7. For very 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
ADM1021A. Leave the remote end of the shield
unconnected to avoid ground loops.
Figure 18. Arrangement of Signal Tracks
10MIL
GND
D+
GND
D–
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
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 can be reduced or removed.
Cable resistance can also introduce errors. A series
resistance of 1
W introduces about 1°C error.
Application Circuits
Figure 19 shows a typical application circuit for the
ADM1021A, using a discrete sensor transistor connected
via a shielded, twisted pair cable. The pullups on SCLK,
SDATA, and ALERT are required only if they are not
already provided elsewhere in the system.
The SCLK and SDATA pins of the ADM1021A can be
interfaced directly to the SMBus of an I/O chip. Figure 20
shows how the ADM1021A might be integrated into a
system using this type of I/O controller.
Figure 19. Typical Application Circuit
VDD
STBY
SCLK
SDATA
ALERT
ADD0
ADD1
GND
D+
D–
0.1µ F
ALL
3.3 V
TO CONTROL
CHIP
SET TO REQUIRED
ADDRESS
IN
OUT
I/O
C1*
SHIELD
2N3904
* C1 IS OPTIONAL
ADM1021A
10k
Figure 20. Typical System Using ADM1021A
USB
PROCESSOR
DISPLAY
SYSTEM BUS
DISPLAY
CACHE
SYSTEM
MEMORY
GMCH
FWH
(FIRMWARE HUB)
ADM1021A
D–
D+
ALERT
SCLK
SDATA
SUPER
I/O
SMBus
PCI BUS
PCI SLOTS
2 USB PORTS
CD−ROM
HARD
DISK
2 IDE PORTS
ICH
I/O CONTROLLER
HUB
USB
ORDERING INFORMATION
Device Number
Temperature Range
Package Type
Package Option
Shipping
ADM1021AARQZ
0
°C to +100°C
16−Lead QSOP
RQ−16
98 Tube
ADM1021AARQZ−R
0
°C to +100°C
16−Lead QSOP
RQ−16
2500 Tape & Reel
ADM1021AARQZ−R7
0
°C to +100°C
16−Lead QSOP
RQ−16
1000 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*The “Z’’ suffix indicates Pb−Free part.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn