DS9108 Datasheet, PDF (1/3 Pages) Maxim Integrated Products – Concrete Temperature Monitor

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GENERAL DESCRIPTION
This product is a sealed plastic stick containing three
DS1921G iButtons®. The iButtons are connected in
parallel through metal plates that are spot-welded to
the IO and GND contact, respectively. Two stranded
wires protruding from the top end of the stick allow
for a 1-Wire® reader/write to make contact to the
iButtons for setup and data retrieval. Electrically, the
product is specified by the DS1921G data sheet, with
the proper scaling (e.g., current ×3, capacitance ×3).
The mechanical and thermal characteristics of the
module are specified in this document.
APPLICATIONS
Concrete Maturity Monitoring
TYPICAL OPERATING CIRCUIT
V_CC
R_PUP*
Portable
1-Wire
reader ^IO
GND
Temperature
Monitor
Red
Black
DS9108
Concrete Temperature
Monitor
FEATURES
ƒ Three DS1921G networked to monitor temperate
at the top, bottom and center of the stick
ƒ Connects to 1-Wire reader/writer through color-
coded 18 AWG (1 mm Ø) stranded wires with ½
inch (1.3 cm) stripped ends
ƒ Electrically compatible to the DS1921G
Thermochron iButton (3 in parallel)
ƒ Sealed against liquid intrusion
ƒ Module position information stored in DS1921G
memory
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS9108-8#
-20°C to 65°C
8” (20.3 cm) depth*
DS9108-10#
-20°C to 65°C
10” (25.4 cm) depth
DS9108-12#
-20°C to 65°C
12” (30.5 cm) depth
DS9108-15#
-20°C to 65°C
15” (38.1 cm) depth
Shipped in bulk with the wires bundled with a tie
* Indicates depth of concrete to monitor, actual stick
length is 0.25” (0.6 cm) less then depth
BLOCK DIAGRAM
Stranded wire
Ends twisted
IO
Red
wire
GND
Black
wire
Metal plates welded
to iButtons
U1
U2
U3
DS1921G
#1
TOP
DS1921G
#2
MIDDLE
DS1921G
#3
BOTTOM
Transition wire to
metal plate
* See Application Note 3829 for Rpup resistor size selection.
iButton and 1-Wire are registered trademarks of Dallas
Semiconductor.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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