DS3234 Maxim, DS3234 Datasheet - Page 13

• Manufacturer Part Number: DS3234
• Description: The DS3234 is a low-cost, extremely accurate SPI™ bus real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal
• Manufacturer: Maxim

The DS3234 contains two time-of-day/date alarms. Alarm
1 can be set by writing to registers 07h to 0Ah. Alarm 2
can be set by writing to registers 0Bh to 0Dh. The alarms
can be programmed (by the alarm enable and INTCN
bits of the control register) to activate the INT/SQW output
on an alarm match condition. Bit 7 of each 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 pro-
grammed to repeat every second, minute, hour, day, or
date. Table 2 shows the possible settings. Configurations
not listed in the table will result in illogical operations.
Table 2. Alarm Mask Bits
DY/DT
DY/DT
X
X
X
X
0
1
X
X
X
0
1
A1M4
1
1
1
1
0
0
A2M4
ALARM 1 REGISTER MASK BITS (BIT 7)
ALARM 2 REGISTER MASK BITS (BIT 7)
1
1
1
0
0
Extremely Accurate SPI Bus RTC with
A1M3
1
1
1
0
0
0
A2M3
____________________________________________________________________
1
1
0
0
0
A1M2
Alarms
1
1
0
0
0
0
Integrated Crystal and SRAM
A2M2
1
0
0
0
0
A1M1
1
0
0
0
0
0
The DY/DT bits (bit 6 of the alarm day/date registers)
control whether the alarm value stored in bits 0 to 5 of
that register reflects the day of the week or the date of
the month. If DY/DT is written to logic 0, the alarm will
be the result of a match with date of the month. If
DY/DT is written to logic 1, the alarm will be 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 INT/SQW signal. The match is tested on the once-
per-second update of the time and date registers.
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 once per minute (00 seconds of every minute)
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
ALARM RATE
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