DS1680 Datasheet | Dallas Semiconductor

.. DS1680 Portable System Controller with Touch-Screen Control .maxim-ic. Features - Real-time clock (RTC) - Counts seconds, minutes, hours, date, month, day of the week, and year with leap-year pensation 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://.maxim-ic./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 provides seconds, minutes, hours, day, date, month, and year information with leap-year pensation as well as an alarm interrupt. This interrupt works when the DS1680 is powered by the system power supply or when in battery-backup operation, so the alarm can be used to wake up a system that is...