X9440

Temperature under bias ................... -65to +135
Storage temperature ....................... -65 to +150
Voltage on SCK, SCL or any address input
with respect to V_SS................................... -1V to +7V
Voltage on V+ (referenced to V_SS) ......................+7V
Voltage on V- (referenced to V_SS) ........................-7V
(V+) - (V-) ............................................................12V
Any V_H....................................................................V+
Any V_L ..............................................................VLead
temperature (soldering, 10 seconds)............... 300

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The X9440 integrates two non volatile digitally controlled potentiometers (XDCP) and two voltage comparators on a CMOS monolithic microcircuit.

The X9440 contains two resistor arrays, each composed of 63 resistive elements. Between each element and at either end are tap points accessible to the wiper elements. The position of the wiper element on the array is controlled by the user through the SPI serial bus interface.

Each X9440 potentiometer has an associated voltage comparator. The comparator compares the external input voltage V_NI with the wiper voltage V_W and sets the output voltage level to a logic high or low.

Each X9440 resistor array and comparator has associated with it a wiper counter register (WCR), analog control register (ACR), and eight 6 bit data registers that can be directly written and read by the user. The contents of the wiper counter register controls the position of the wiper on the resistor array. The contents of the analog control register controls the comparator and its output. The potentiometer is programmed with a SPI serial interface.