DS1065 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1065

EconOscillator/Divider

Dallas Semiconductor -> Maxim Integrated 

DS1065

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 5kW.

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 kW 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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