DS9097 Datasheet | Dallas Semiconductor

FEATURES - Provides a simple, low-cost interface to an RS232C Port for reading and writing i Button TM devices (DS9097E required for programming DS198x Add-Only i Buttons) - Adapter is powered entirely from an RS232 interface (DS9097E may require optional auxiliary 12V supply) - Standard DB-9 (DSD9097) or DB-25 (DS9097E) female connector for mating the adapter to the Port of a puter and RJ-11 connector for easy attachment of a probe such as the DS9092GT - DS9097E has an additional 2.1 mm male power jack to allow for an auxiliary 12V DC supply for programming Add-Only i Buttons Pin assignment DS9097, DB-9 TXD (3), RXD (2), DTR (4), PC-Ground (5); all other pins not connected Pin assignment DS9097E, DB-25 TXD (2), RXD (3), DTR (20), RTS (4), PCGround (7); all other pins not connected .. Auxiliary supply should be a regulated 12V @ 10 m A minimum, center=GND, outer ring=V+ (Newark Electronics Stock No. 84F2081, Allied Electronics Stock No. 9289895, Stancor Model STA-300R, or equivalent) DESCRIPTION The DS9097 Port Adapter is a simple, low-cost passive adapter which performs RS232C (±12V) level conversion, allowing an i Button probe to be connected to the serial port of a puter so that a non EPROM i Button can be read and written directly. It can also read all EPROM-based i Buttons. The serial port must support a data transmission rate of 115.2 kbits/s in order to create the 1-Wire TM time slots correctly. Nearly all PCs support the required data rate and are fully patible with the DS9097. Since an 8-bit character (6 data bits plus start and stop bit) on the RS232 port operating at 115.2 kbits/s is used to form a single 1-Wire time slot, the maximum effective 1-Wire transfer rate is 14.4 kbits/s (regular speed). Details on the operation of the DS9097 including software examples are found in Application Note 74, Section V. 1 of 2 102099 DS9097/DS9097E The DS9097E is an upgraded version of the DS9097 that is capable of supplying the 12 volts necessary to program the...