1337GDCGI IDT, 1337GDCGI Datasheet - Page 8

• Manufacturer Part Number: 1337GDCGI
• Description: Real Time Clock Real Time Clock
• Manufacturer: IDT

Specifications of 1337GDCGI

• Rohs: yes
• Function: Clock, Calendar, Alarm
• Rtc Bus Interface: I2C
• Date Format: YY-MM-DD-dd
• Time Format: HH
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Battery Backup Switching: No
• Part # Aliases: IDT1337GDCGI

Table 2. Alarm Mask Bits
Special-Purpose Registers
The IDT1337G has two additional registers (control and status) that control the RTC, alarms, and square-wave output.
Control Register (0Eh)
Table 3. SQW/INT Output
IDT®™™ REAL-TIME CLOCK WITH I
DY/DT
DY/DT
INTCN
IDT1337G
REAL-TIME CLOCK WITH I
EOSC
Bit 7
X
X
X
X
X
X
X
0
1
0
1
0
0
0
0
1
Bit 7: Enable Oscillator (EOSC). This active-low bit when set to logic 0 starts the oscillator. When this bit is set to
a logic 1, the oscillator is stopped. This bit is enabled (logic 0) when power is first applied.
Bits 4 and 3: Rate Select (RS2 and RS1). These bits control the frequency of the square-wave output when the
square wave has been enabled. Table 3 shows the square-wave frequencies that can be selected with the RS bits.
These bits are both set to logic 1 (32 kHz) when power is first applied.
A1M4
A2M4
Alarm 1 Register Mask Bits (Bit 7)
Alarm 2 Register Mask Bits (Bit 7)
RS2
1
1
1
1
0
0
1
1
1
0
0
Bit 6
0
0
1
1
X
0
A1M3
A2M3
RS1
X
0
1
0
1
1
1
1
0
0
0
1
1
0
0
0
Bit 5
0
2
C SERIAL INTERFACE
2
SQW/INTB Output
C SERIAL INTERFACE
A1M2
1
1
0
0
0
0
32.768 kHz
4.096 kHz
8.192 kHz
A2M2
Bit 4
RS2
1 Hz
A2F
1
0
0
0
0
A1M1
1
0
0
0
0
0
Bit 3
RS1
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.
A2IE
X
X
X
X
1
INTCN
Bit 2
8
Bit 1
A2IE
Alarm Rate
Alarm Rate
Bit 0
A1IE
IDT1337G
REV L 102412
RTC