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DS1481

Dallas Semiconductor
Part Number DS1481
Manufacturer Dallas Semiconductor
Description Wire Bus Master
Published Sep 2, 2008
Detailed Description DS1481 PRELIMINARY DS1481 1–Wire Bus Master with Overdrive FEATURES PIN ASSIGNMENT VCC ENI O1/BSY1 O2/BSY2 D/CLK RES...
Datasheet PDF File DS1481 PDF File

DS1481
DS1481

Overview
DS1481 PRELIMINARY DS1481 1–Wire Bus Master with Overdrive FEATURES PIN ASSIGNMENT VCC ENI O1/BSY1 O2/BSY2 D/CLK RES NC 1 2 3 4 5 6 7 14 13 12 11 10 9 8 I/O ENO I1 I2 NC NC GND • Provides a synchronous interface to Dallas Semiconductor 1–wire devices • Compatible with low power parallel ports • Can be cascaded with other DS1481’s • Allows print spooler and other processes to run during • Provides high speed communcation with overdrive capable devices www.
DataSheet4U.
com 1–wire I/O 14–PIN SOIC (150 MIL) • Space saving 14–pin (150 mil), SOIC package PIN DESCRIPTION VCC ENI D/CLK RES O1/BSY1 O2/BSY2 GND I1 I2 I/O ENO NC – – – – – – – – – – – – Supply Enable In Data/Clock Reset Output 1/Busy 1 Output 2/Busy 2 Ground Input 1 Input 2 1–wire I/O Enable Out No Connect DESCRIPTION The DS1481 is a dedicated 1–wire timing generator.
The device is normally used in conjunction with a parallel port controller to provide the necessary interface to the host processor.
Busy signals allow the host processor to perform other tasks while 1–wire “time–slots” are completed.
The DS1481 also saves the state of D/CLK and RES allowing print spoolers to operate without affecting 1–wire communication.
DS1481 based devices can be cascaded.
The first device’s O1/BSY1 and O2/BSY2 connect to the PC printer port’s BUSY and SELECT OUT signals (pins 11 and 13 respectively).
The next DS1481 connects its O1/BSY1 and O2/BSY2 to the first device’s I1 and I2 respectively.
ENO of the first device connects to ENI of the second device.
More DS1481’s can be stacked in a similar manner.
The last devices I1 and I2 connect to BUSY and SELECT of the attached printer.
The DS1481’s 3–volt operation insures compatibility with most low power parallel ports (i.
e.
, portable computers).
021798 1/10 DS1481 OPERATION One wire communication is executed in “time slots”.
The DS1481 generates either a read/write bit “time slot” or a reset on the I/O pin.
The operation performed is determined by the states of the ...


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