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DS1677 Datasheet

  • DS1677

  • Portable System Controller

  • 162.24KB

  • Dallas   Dallas

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DS1677
Portable System Controller
www.dalsemi.com
FEATURES
Provides Real Time Clock:
- Counts seconds, minutes, hours, date of
the month, 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鈥揻ail
- Automatically restarts microprocessor
after power failure
- Monitors push鈥揵utton for external
override
- Halts and resets an out of control
microprocessor
=NV
RAM control:
- Automatic battery backup and write
protection to external SRAM
3鈥揷hannel, 8鈥揵it analog鈥搕o鈥揹igital converter
Simple 3鈥搘ire interface
+5.0V operation
=1.25V
threshold detector for power鈥揻ail
warning
PIN ASSIGNMENT
V
BAT
V
CCO
SCLK
I/O
CS
CEI
CEO
NC
INT
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ST
V
CC
X1
X2
AIN0
AIN1
AIN2
RST
PFI
PFO
20-Pin TSSOP
ORDERING INFORMATION
DS1677E 20鈥揚(yáng)in TSSOP
DESCRIPTION
The Portable System Controller is a circuit which incorporates many of the functions necessary for low
power portable products integrated into one chip. The DS1677 provides a Real Time Clock, NV RAM
controller, micro-processor monitor, power鈥揻ail warning, and a 3鈥揷hannel, 8鈥揵it analog鈥搕o鈥揹igital
converter. Communication with the DS1677 is established through a simple 3鈥搘ire interface.
The Real Time Clock (RTC) provides seconds, minutes, hours, day, date, month, and year information
with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the
DS1677 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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