DS1375T+T&R Maxim Integrated Products, DS1375T+T&R Datasheet - Page 8

• Manufacturer Part Number: DS1375T+T&R
• Description: IC RTC SERIAL W/ALARM 6TDFN
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/Alarmr

Specifications of DS1375T+T&R

• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -

I
The DS1375 contains two time-of-day/date alarms.
Alarm 1 can be set by writing to registers 07h–0Ah.
Alarm 2 can be set by writing to registers 0Bh–0Dh.
The alarms can be programmed (by the alarm enable
and INTCN bits of the control register) to activate the
SQW/INT output on an alarm match condition. Bit 7 of
the time-of-day/date alarm registers are mask bits
(Table 2). When all the mask bits for each alarm are
logic 0, an alarm only occurs when the values in the
timekeeping registers match the corresponding values
stored in the time-of-day/date alarm registers. The
alarms can also be programmed to repeat every sec-
ond, minute, hour, day, or date. Table 2 shows the pos-
sible settings. Configurations not listed in the table
result in illogical operation.
The DY/DT bits (bit 6 of the alarm day/date registers)
control whether the alarm value stored in bits 0–5 of
Table 2. Alarm Mask Bits
8
DY/DT
2
X
X
X
X
0
1
C Digital Input RTC with Alarm
_____________________________________________________________________
A1M
1
1
1
1
0
0
ALARM 1 REGISTER
MASK BITS (BIT 7)
A1M
1
1
1
0
0
0
A1M
1
1
0
0
0
0
A1M
1
0
0
0
0
0
Alarm once per
second
Alarm when seconds
match
Alarm when minutes
and seconds match
Alarm when hours,
minutes, and
seconds match
Alarm when date,
hours, minutes, and
seconds match
Alarm when day,
hours, minutes, and
seconds match
ALARM RATE
Alarms
that register reflects the day of the week or the date of
the month. If DY/DT is written to logic 0, the alarm is the
result of a match with date of the month. If DY/DT is
written to logic 1, the alarm is the result of a match with
day of the week.
When the RTC register values match alarm register set-
tings, the corresponding alarm flag A1F or A2F bit is
set to logic 1. If the corresponding alarm interrupt
enable A1IE or A2IE is also set to logic 1, and the
INTCN bit is set to logic 1, the alarm condition activates
the SQW/INT signal. The match is tested on the once-
per-second update of the time and date registers.
The DS1375 has two additional registers (control and
status) that control the RTC, alarms, and square-wave
output.
DY/DT
X
X
X
0
1
A2M
REGISTER MASK
1
1
1
0
0
Special Purpose Registers
BITS (BIT 7)
ALARM 2
A2M
1
1
0
0
0
A2M
1
0
0
0
0
Alarm once per minute
(00 seconds of every min)
Alarm when minutes match
Alarm when hours and
minutes match
Alarm when date, hours, and
minutes match
Alarm when day, hours, and
minutes match
ALARM RATE