Rainbow-electronics DS2404 Bedienungsanleitung PDF herunterladen (Seite 22)

DS2404

22 of 29

Operate Mode (Battery-Backed)

Figure 16 shows the necessary connections for operating the DS2404 in V

Operate mode.

OPERATE MODE Figure 16

Pin 1 & 16 2.8V to 5.5V

BATB

Pin 9 2.8V to 5.5V

BATO

Pin 10 must be unconnected

To always allow communication through the 1-Wire or wire port, the voltage on V

must be

approximately 3-wire port, the voltage on V

must be approximately 0.2V above the voltage on V

BATB

Otherwise the DS2404 will retain data, but will not allow any access.

The V

BATB

pin is normally connected to any standard 3V lithium cell or other energy source. As V

falls

below V

BATB

, the power switching circuit allows V

BATB

to provide energy for maintaining clock

functionality and data retention. No communication can take place while V

BATB

is greater than V

During power-up, when V

reaches a value of approximately 0.2V above V

BATB

, the power switching

circuit connects V

and disconnects V

BATB

. If the oscillator is on, no communication can take place until

has stayed approximately 0.2V above V

BATB

for 123 ± 2ms. During power-down, the falling V

must pass the range from V

BATB

to 0V in no less than 100ns for the power switching circuit to function

properly.

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