DS1680 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS1680

Portable System Controller with Touch-Screen Control

Dallas Semiconductor -> Maxim Integrated 

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

DS1680

Portable System Controller

with Touch-Screen Control

PIN ASSIGNMENT

44

1

VBAT

X1

X2

AVG

BHE

COEN

OUT_SELECT

CONVERT

PD_RESET

PEN_SELECT

ANSELIN

11

12

34

33

PFI

GND

D7

D6

D5

D4

D3

D2

D1

D0

NEW_DATA

23

22

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

3.3V Operation

DS1680FP-5

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

compensation 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 powered down.

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