Rainbow-electronics DS3904 Manual de usuario descargar pdf (Pagina 11)

DS3904

DS3904 Triple 128-Position Nonvolatile

Variable Digital Resistor/Switch

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11

Following the start condition, the DS3904 monitors the

SDA bus checking the device-type identifier being

transmitted. Upon receiving the 101000 control code,

the appropriate device address bit, and the read/write

bit, the slave device outputs an acknowledge signal on

the SDA line.

Applications Information

Power-Supply Decoupling

To achieve the best results when using the DS3904,

decouple the power supply with a 0.01µF or 0.1µF

capacitor. Use a high-quality ceramic surface-mount

capacitor. Surface-mount components minimize lead

inductance, which improves performance, and ceramic

capacitors tend to have adequate high-frequency

response for decoupling applications.

Using the Resistor as a Switch

By taking advantage of the high-impedance mode, a

switch can be created to produce a digital output.

Setting one of the resistor registers to 00h creates the

low state. Writing 80h into the same resistor register

enables the high-impedance state. Furthermore, an

external pullup resistor can be used to generate a high

state as well.

High Resistor Terminal Voltage

It is possible to have a voltage on the resistor-high termi-

nals that is higher than the voltage connected to V

For instance, connecting V

to 3.0V while one or more

of the resistor high terminals are connected to 5.0V

allows a 3V system to control a 5V system. The 5.5V

maximum still applies to the limit on the resistor high ter-

minals regardless of the voltage present on V

Chip Information

TRANSISTOR COUNT: 9049

SUBSTRATE CONNECTED TO GROUND

Package Information

For the latest package outline information, go to www.maxim-ic.

com/packages.

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