DS1413 passive serial port i button tm holder DS1413 advanced information 020698 1/1 features ? small size, lowcost interface to an rs232c com port for reading and writing i button devices ? supports reading all and writing noneprom i button devices at regular speed ? powered entirely from an rs232 interface ? standard db female connector for mating to the com port of a computer with a ds9098 i button retainer for a single i button or microlan cable (ds1402x) dtr gnd rxd txd d1 1n522b 3.9v d3 era82004 fuji d2 1n5234 6.2v d4 era82004 fuji r1 1.5k schematic 33 mm 38 mm 17 mm ordering information DS1413 db9 connector description the DS1413 passive serial port i button holder is a sim- ple, lowcost adapter which performs rs232c ( 12v) level conversion, allowing a noneprom i button to 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 1wire time slots correctly. nearly all pcs and several other hardware platforms support the required bit rate and are fully compatible with the DS1413. since an eight bit character (6 data bits plus start and stop bit) on the rs232c port operating at 115.2 kbits/s is used to form a single 1wire time slot, the maximum effective 1wire transfer rate is 14.4 kbits/s (regular speed). the DS1413 has a ds9098 retainer for a single f5 micro- can and can replace the ds9097 com port adapter in applications that use only a single i button. multiple i but- tons can be connected to the DS1413 using standard microlan cables and button holders (see ds1401 and ds1402x data sheets). the DS1413 does not support the strong pullup which is required to run the crypto i button. for applications requiring a strong 5v pullup see ds1411. details on the operation of the DS1413 are found in application note 74, section v.
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