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PDF DS1677 Data sheet ( Hoja de datos )
| Número de pieza | DS1677 | |
| Descripción | Portable System Controller | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1677 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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–fail
- Automatically restarts microprocessor
after power failure
- Monitors push–button for external
override
- Halts and resets an out of control
microprocessor
=NV RAM control:
- Automatic battery backup and write
protection to external SRAM
3–channel, 8–bit analog–to–digital converter
Simple 3–wire interface
+5.0V operation
=1.25V threshold detector for power–fail
warning
PIN ASSIGNMENT
VBAT
VCCO
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
20-Pin TSSOP
ST
VCC
X1
X2
AIN0
AIN1
AIN2
RST
PFI
PFO
ORDERING INFORMATION
DS1677E 20–Pin 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–fail warning, and a 3–channel, 8–bit analog–to–digital
converter. Communication with the DS1677 is established through a simple 3–wire 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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DS1677 ADDRESS MAP Figure 3
BIT7
BIT0
00 0
10 SECONDS
SECONDS
01 0
10 MINUTES
MINUTES
02
0 12 10 HR 10 HR
24 A/P
HOURS
03 0 0 0
00
DAY
04 0 0
10 DATE
DATE
05 0 0 0 10 MO.
MONTH
06 10 YEAR
YEAR
07 M
10 SEC ALARM
SECONDS ALARM
08 M
10 MIN ALARM
MINUTES ALARM
09
M 12 10 HR 10 HR
24 A/P
HOUR ALARM
0A M 0 0
0
DAY ALARM
0B CONTROL REGISTER
0C STATUS REGISTER
0D WATCHDOG REGISTER
0E ADC REGISTER
0F
DS1677
RESERVED
7F
CLOCK, CALENDAR AND ALARM
The time and calendar information is accessed by reading/writing the appropriate register bytes. Note
that some bits are set to zero. These bits will always read zero regardless of how they are written. Also
note that registers 0Fh to 7Fh are reserved. These registers will always read zero regardless of how they
are written. The contents of the time, calendar, and alarm registers are in the Binary–Coded Decimal
(BCD) format.
The DS1677 can run in either 12–hour or 24–hour mode. Bit 6 of the hours register is defined as the 12–
or 24–hour mode select bit. When high, the 12–hour mode is selected. In the 12–hour mode, bit 5 is the
AM/PM bit with logic one being PM. In the 24–hour mode, bit 5 is the second 10–hour bit (20–23
hours).
The DS1677 also contains a time of day alarm. The alarm registers are located in registers 07h to 0Ah.
Bit 7 of each of the alarm registers are mask bits (see Table 1). When all of the mask bits are logic 0, an
alarm will occur once per week when the values stored in timekeeping registers 00h to 03h match the
values stored in the time of day alarm registers. An alarm will be generated every day when mask bit of
the day alarm register is set to one. An alarm will be generated every hour when the day and hour alarm
mask bits are set to one. Similarly, an alarm will be generated every minute when the day, hour, and
minute alarm mask bits are set to one. When day, hour, minute, and seconds alarm mask bits are set to
one, an alarm will occur every second.
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SINGLE BYTE DATA TRANSFER Figure 6
MULTIPLE BYTE BURST TRANSFER Figure 7
POWER–FAIL COMPARATOR Figure 8
DS1677
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| PDF Descargar | [ Datasheet DS1677.PDF ] | |
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