1 of 3 rev: 102106 note: some revisions of this device may incor porate deviations from published specifications known as erra ta. multiple revisions of any device may be simultaneously available through various sales channel s. for information about device errata, click here: www.maxim-ic.com/errata . general description this product is a sealed plastic stick containing three ds1921g i buttons ? . the i buttons 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 re trieval. 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 features ? three ds1921g networked to monitor temperate at the top, bottom and center of the stick ? connects to 1-wire read er/writer through color- coded 18 awg (1 mm ?) stranded wires with ? inch (1.3 cm) stripped ends ? electrically compatible to the ds1921g thermochron i button (3 in parallel) ? sealed against liquid intrusion ? module position information stored in ds1921g memory ordering information part temp range pin-package ds9108-8# -20c to 65c 8 ? (20.3 cm) depth* ds9108-10# -20c to 65c 10 ? (25.4 cm) depth ds9108-12# -20c to 65c 12 ? (30.5 cm) depth DS9108-15# -20c to 65c 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 io gnd portable 1-wire reader red black r pup * v cc temperature monitor * see application note 3829 for rpup resistor size selection. ds9108 concrete temperature monito r www.maxim-ic.com io red wire gnd black wire u3 ds1921g #1 top ds1921g #2 middle ds1921g #3 bottom u1 u2 stranded wire ends twisted metal plates welded to ibuttons transition wire to metal plate i button and 1-wire are registered trademarks of dallas semiconductor.
ds9108 concrete temperature module 2 of 3 absolute maximum ratings voltage range on any pin relative to ground see ds1921g datasheet operating temperature range -4f to 149f (-20c to +65c) storage temperature range see ds1921g datasheet stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those i ndicated in the operational sections of t he specifications is not implied. exposure to the absolute maximum rati ng conditions for extended peri ods may affect device. specifications (see ds1921g datasheet, t a = -4f to 149f (-20c to +65c) (note 1)) parameter conditions min typ max units 2.5 ounces weight 72 grams physical dimensions see technical drawing 12.9 13.1 inches wire length 32.8 33.3 cm 10 lbf tensile strength of wires 44.5 newton thermal response time (note 2) 500 s note 1: assembled module production tested at 77f (25 c). note 2: response time in water is the time required for the record ed value to read 63% of the temperature?s real variation. material: pvc with pvc cement and e-60nc black hysol epoxy for wire sealant pin description pin name function red wire io 1-wire bus interface. open drain, requires external pull-up resistor. black wire gnd ground reference i button location within module each ds1921g in the ds9108 module contains a memory tag ma rker to indicate its position in the assembly. the position mark is a crc16 validated packet starting on page 15 in the user memory. the memory image for ?top?, ?middle?, and ?bottom?: table 1. memory tag description tag type address contents (hex) description top 01 54 fa 60 ?t? in a crc validated packet middle 01 4d 3b aa ?m? in a crc validated packet bottom 1e0h?1e3h 01 42 7b ae ?b? in a crc validated packet
ds9108 concrete temperature module 3 of 3 typical operating characteristics the module is inserted into wet concrete with the top approximately 0.25 inches (0.6 cm) below the surface. the wires are draped on the surface for later data retrieval. concrete surface 0.25 package information l m b t bottom ibutton middle ibutton top ibutton 0.20 (0.5) 0.63 (1.6) 1.10 (2.8) concrete depth l b m t 8 (20.3) 7.75 (19.7) .60 (1.5) 3.88 (9.9) .60 (1.5) 10 (25.4) 9.75 (24.8) .60 (1.5) 4.88 (12.4) .60 (1.5) 12 (30.5) 11.75 (29.8) .60 (1 .5) 5.88 (14.9) .60 (1.5) 15 (38.1) 14.75 (37.5) .60 (1 .5) 7.38 (18.7) .60 (1.5) inches (centimeters)
|
