DS1677E Maxim Integrated Products, DS1677E Datasheet - Page 6

• 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: -

TIME OF DAY ALARM BITS Table 1
SPECIAL PURPOSE REGISTERS
The DS1677 has two additional registers (control register and status register) that control the RTC and
interrupts.
CONTROL REGISTER
EOSC (Enable Oscillator). This bit, when set to logic 0 will start the oscillator. When this bit is set to a
logic 1, the oscillator is stopped and the DS1677 is placed into a low-power standby mode with a current
drain of less than 200nA when in battery-backup mode. When the DS1677 is powered by V
oscillator is always on regardless of the status of the
when
WP (Write Protect). Before any write operation to the real time clock or any other registers, this bit
must be logic 0. When high, the write protect bit prevents a write operation to any register.
AIS0–AIS1 (Analog Input Select). These two bits are used to determine the analog input for the analog-
to-digital conversion. Table 2 lists the specific analog input that is selected by these 2 bits.
AIE (Alarm Interrupt Enable). When set to a logic 1, this bit permits the Interrupt Request Flag (IRQF)
bit in the status register to assert INT. When the AIE bit is set to logic 0, the IRQF bit does not initiate the
INT signal.
ANALOG INPUT SELECTION Table 2
SECONDS
ALARM REGISTER MASK BITS (BIT 7)
EOSC
BIT 7
AIS1
1
0
0
0
0
0
0
1
1
EOSC
is a logic 0.
MINUTES
BIT 6
WP
AIS0
1
1
0
0
0
0
1
0
1
HOURS
BIT 5
AIS1
ANALOG INPUT
1
1
1
0
0
NONE
AIN0
AIN1
AIN2
DAYS
BIT 4
AIS0
1
1
1
1
0
Alarm once per second.
Alarm when seconds match.
Alarm when minutes and seconds match.
Alarm when hours, minutes and seconds match.
Alarm when day, hours, minutes and seconds match.
6 of 18
EOSC
BIT 3
0
bit; however, the RTC is incremented only
DESCRIPTION
BIT 2
0
BIT 1
0
BIT 0
AIE
CC
, the