The DS1846 NV tri-potentiometer, memory, and MicroMonitor consists of two 10kohm 100-position linear taper potentiometers, one 100kohm 256-position linear taper potentiometer; 256 bytes of EEPROM memory; and a MicroMonitor. The device provides an ideal method for setting bias voltages and currents in control applications using a minimum of circuitry.
The EEPROM memory allows a user to store configuration or calibration data for a specific system or device and provides control of the potentiometer wiper settings. Any type of user information can reside in the first 248 bytes (00h to F7h) of this memory. The next three bytes of memory (F8h to FAh) are for potentiometer settings and the last five addresses of EEPROM memory (FBh to FFh) are reserved. These reserved and potentiometer registers should not be used for data storage. Access to this EEPROM is through an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The wiper positions of the DS1846, as well as EEPROM data, can be hardware write-protected using the WP input pin.
The MicroMonitor is a precision temperature-compensated reference and comparator that monitors certain vital status conditions for a microprocessor. When a sense input detects an out-of-tolerance (VCC) condition, a nonmaskable interrupt is generated. As the voltage at the device degrades, an internal powerfail signal is generated that can be used to reset the processor. When VCC returns to an in-tolerance level, the reset signal is kept in the active state for a minimum time of tRST to allow for the stabilization of the power supply and the microprocessor. The MicroMonitor also functions as a pushbutton reset control. The pushbutton input is debounced internally and generates an active pulse width of tRST minimum.
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