Analog Devices Inc./Maxim Integrated

The DS9097U is a sophisticated RS-232 to 1-Wire®adapter, which performs RS-232 level conversion and actively generates the 1-Wire communication signals. Together with an adequate software driver, it enables a Windows®-based PC to directly communicate with any 1-Wire device connected to the adapter's RJ11 port. The DB9 version reads and writes any non-EPROM 1-Wire device. To write to EPROM devices, the DB25 version with external power supply is required. For a list of suitable 1-Wire network cables, refer to theConnectivity Matrixtable in the DS1402x 1-Wire network cables data sheet.All DS9097U adapters are based on the DS2480B serial 1-Wire line driver chip. The RXD/TXD polarity select input of the DS2480B is connected to VDD(noninverting).Free software drivers can bedownloaded here.The DS9097U communicates with 1-Wire devices at standard speed as well as overdrive speed. The serial port must support a data transmission rate of 9600bps. Under software control, the adapter can be set up for RS-232 data rates of 19200bps, 57600bps, and 115200bps. The two higher rates are recommended for communication at overdrive speed with overdrive-capable devices. Since the DS9097U operates in a byte mode, every data byte received from the RS-232 port generates eight time slots on the 1-Wire line.Note that there are some COM ports that use signal levels of less than (±) 5V. The DB9 versions of this adapter do not work with such ports. The DS9097U-E25 adapter, however, functions in most cases if external power is supplied. Without EPROM programming, the external power can be anywhere in the range of 6V to 9V. For EPROM programming the voltage must be at 12V in any case. Before using an externally powered DS9097U-E25 with a COM port of less than (±) 5V, check whether the COM port will not be damaged by 5V on its RXD input.

The DS9100 touch and hold probe stampings' function is similar to the DS9098iButton® retainer. An F5 MicroCan™ will fit completely into the DS9098, but the flange and about one-third of the can will extend out if pressed into the DS9100. As a probe, the DS9100A together with the coiled spring DS9100C allows readingiButtons on contact. With additional pressure, the stiff springs of the DS9100A's outer ring will deflect and grip the MicroCan sufficiently to provide a continuous contact to both the can rim (ground) and the can lid (data). If reading on contact is not required, the cantilever-type center contact DS9100B can be used rather than the DS9100C.

TheiButton® Capsule is a mechanical enclosure to protect Temperature LoggeriButtons (DS1921 and DS1922 series) from moisture, solvents and pressure. It provides IP68 protection to theiButton inside (refer to Application Note 4126:Understanding the IP (Ingress Protection) Ratings ofiButton Data Loggers and Capsule). The protection level exceeds the "Water Resistant 3 ATM" requirements.The DS9107 consists of a base with the cavity for a F5iButton, a screw-in plug with O-ring to seal the enclosure, and a top with two stainless-steel screws to mount theiButton Capsule to a cable, e.g., to measure temperature at different levels within a liquid. The cable is inserted into the notch of the plug where it is held in place by the matching protrusion of the top piece.Base, plug, and top are made of polyphenylene sulfide (PPS). This material is chosen for its mechanical properties (remains stable during both long and short-term exposure to high temperatures), inherent flame resistance, and outstanding chemical resistance (inert to steam, strong bases, fuels and acids). Although PPS is virtually insoluble below 200°C, it can be attacked by chlorinated hydrocarbons. The silicone O-ring matches the temperature and chemical qualities of the PPS. In addition, it is resistant to sunlight, ozone, oxygen, and UV light. The chemical stability of the screws does not compromise that of the PPS and the silicone.ApplicationsAutoclave SterilizationMonitoring of beverage productionScientific researchSeawater temperature profiling