Rainbow Electronics DS1680 User Manual
Features, Pin assignment, Ordering information
1 of 23
110901
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
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.
DS1680
Portable System Controller
with Touch-Screen Control
www.maxim-ic.com
44-Pin MQFP (10 x 10 x 2mm)
P F I
GND
D7
CEI
33
34
NEW_DATA
PFO
V
BAT
INT
22
23
11
12
1
44
V
CCO
CS
ST
V
CC
RST
CEO
I/O
SCLK
D0
D1
D2
D3
D4
D5
D6
OSCIN
PEN_OFF
X+
Y-
V
REF
AVS
Y+
AVD
AIN1
AIN0
X-
PD_RESET
PEN_SELECT
ANSELIN
CONVERT
OUT_SELECT
C O E N
BHE
A V G
X2
X1
Package dimension information can be found at: