DS1802

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DS1802 BLOCK DIAGRAM Figure 1

CONTACT CLOSURE INTERFACE CONTROL

The DS1802 can be configured to operate from contact closure inputs sometimes referred to as

pushbutton control. There exists a total of four physical contact closure terminals on the device package.

When combined with the MODE input, these contact closure inputs provide a total of eight different

contact closure functions. These eight contact closure functions are listed in Table 2.

CONTACT CLOSURE INPUTS Table 2

CONTACT INPUT

DESCRIPTION

UC0*

Up contact potentiometer-0

UC1*

Up contact potentiometer-1

DC0*

Down contact potentiometer-0

DC1*

Down contact potentiometer-1

VU**

Volume-up

VD**

Volume-down

B0**

Balance Pot-0

B1**

Balance Pot-1

* independent mode control

** stereo mode control

The MODE input terminal is used to select the mode of wiper control using contact closure. There exist

two modes of wiper control, which include independent mode control and stereo mode control. As shown

in the pin assignment diagram, the contact closure inputs share pins. Input functionality is determined by

the state of the MODE input at power-up.