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DS1065-60 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1065-60 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 10 page DS1065 5 of 10 PROGRAMMING Normally when power is applied to the supply voltage pin the device will enter its normal operating mode, following the power-on reset sequence. However the device can be made to enter a programming mode if a pullup resistor is connected between IN/OUT and the supply voltage pin prior to power-up. The method used for programming is a variant of the 1-WireTM protocol used on a number of Dallas Semiconductor products. HARDWARE The hardware configuration is shown in the diagram. A bus master is used to read and write data to the DS1065’s internal registers. The bus master may have either an open-drain or TTL-type architecture. Figure 11 Programming mode is entered by simply powering up the DS1065 with a pullup of approximately 5k W. This will pull the IN/OUT pin above VIH on power-up and initiate the programming mode, causing the DS1065 to internally release the IN/OUT pin after t STAB and allow the pullup resistor to pull up the pin to the supply rail and await the Master Tx Reset pulse (see diagram). NOTE: To ensure normal operation any external pullup applied to IN/OUT must be greater than 20 k W in value. This will cause the IN/OUT pin to remain below VIH on power-up, resulting in normal operation at the end of tSTAB. |
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