DS1677E Maxim Integrated Products, DS1677E Datasheet - Page 5

• Manufacturer Part Number: DS1677E
• Description: IC CTRLR SYSTEM PORT 20-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Portable System Controllerr

Specifications of DS1677E

• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: 3-Wire Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -

DS1677 ADDRESS MAP Figure 3
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.
0A
0D
0B
0C
0E
00
01
02
03
04
05
06
07
08
09
0F
7F
BIT7
M
M
M
M
0
0
0
0
0
0
12
12
0
0
0
0
10 YEAR
24
24
10 MIN ALARM
10 SEC ALARM
10 SECONDS
10 MINUTES
WATCHDOG REGISTER
10 HR
10 HR
A/P
A/P
CONTROL REGISTER
0
0
0
STATUS REGISTER
10 DATE
ADC REGISTER
RESERVED
10 MO.
10 HR
10 HR
0
0
0
SECONDS ALARM
MINUTES ALARM
HOUR ALARM
DAY ALARM
SECONDS
MINUTES
5 of 18
MONTH
HOURS
DATE
YEAR
DAY
BIT0