DS1680

www.DataSheet4U.com DS1680 Portable System Controller with Touch-Screen Control www.maxim-ic.com FEATURES § Real-time clock (RTC) − Counts seconds, minutes, hours, date, month, day of the week, and year with leap-year compensation valid up to 2100 − Power control circuitry supports system power-on from day/time alarm Microprocessor monitor − Halts microprocessor during power- fail − Automatically restarts microprocessor after power failure − Monitors pushbutton for external override − Halts and resets an out of control microprocessor NV RAM control − Automatic battery backup and write protection to external SRAM 1.25V threshold detector for power- fail warning 10-bit analog-to-digital converter (ADC) − Monotonic with no missing codes Four-wire analog resistive touch-screen interface PIN ASSIGNMENT I/O SCLK CEO PFO V CCO CS V CC RST CEI 34 33 PFI GND D7 D6 D5 D4 D3 D2 D1 D0 NEW_DATA 11 12 AVS PEN_OFF OSCIN YX+ V REF AIN0 AIN1 AVD Y+ X23 22 INT ST 44 1 V BAT X1 X2 AVG BHE COEN OUT_SELECT CONVERT PD_RESET PEN_SELECT ANSELIN § § § § § 44-Pin MQFP (10 x 10 x 2mm) Package dimension information can be found at: http://www.maxim-ic.com/TechSupport/DallasPackInfo.htm ORDERING INFORMATION DS1680FP-3 DS1680FP-5 3.3V Operation 5.0V Operation DESCRIPTION The DS1680 incorporates many functions necessary for low-power portable products, providing an RTC, NV RAM controller, microprocessor monitor, power- fail warning, 10-bit ADC, and a touch-screen controller in one chip. The RTC pr...