DS1689S/T&R Maxim Integrated, DS1689S/T&R Datasheet - Page 9

• Manufacturer Part Number: DS1689S/T&R
• Description: Real Time Clock
• Manufacturer: Maxim Integrated
• Series: DS1689, DS1693r

Specifications of DS1689S/T&R

• Function: Clock, Calendar, NV SRAM Control
• Rtc Bus Interface: Multiplexed
• Date Format: DW
• Time Format: HH
• Rtc Memory Size: 114 B
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-28
• Part # Aliases: 90-1689S-TRL

minute with “don’t care” codes in the hours and minute alarm bytes. The “don’t care” codes in all three
alarm bytes create an interrupt every second. The three alarm bytes may be used in conjunction with the
date alarm as described in the Wakeup/Kickstart section. The century counter will be discussed later in
this text.
Table 1. Time, Calendar, and Alarm Data Modes
CONTROL REGISTERS
The four control registers; A, B, C, and D reside in both bank 0 and bank 1. These registers are accessible
at all times, even during the update cycle.
NONVOLATILE RAM—RTC
The 114 general-purpose nonvolatile RAM bytes are not dedicated to any special function within the
DS1689/DS1693. They can be used by the application program as nonvolatile memory and are fully
available during the update cycle. This memory is directly accessible when bank 0 is selected.
INTERRUPT CONTROL
The DS1689/DS1693 include six separate, fully automatic sources of interrupt for a processor:
The conditions, which generate each of these independent interrupt conditions, are described in greater
detail elsewhere in this data sheet. This section describes the overall control of the interrupts.
BANK 1, 49H
BANK1, 48H
LOCATION
ADDRESS
1. Alarm interrupt
2. Periodic interrupt
3. Update-ended interrupt
4. Wake-up interrupt
5. Kickstart interrupt
6. RAM clear interrupt
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
Hours Alarm 12-hr
Hours Alarm 24-hr
Hours 12-hr Mode
Hours 24-hr Mode
Seconds Alarm
Minutes Alarm
Date of Month
FUNCTION
Day of Week
Date Alarm
Sunday=1
Seconds
Minutes
Century
Month
Mode
Mode
Year
DECIMAL
RANGE
1-12
0-59
0-59
0-59
0-59
0-23
1-12
0-23
1-31
1-12
0-99
0-99
1-31
1-7
9 of 36
01-0C AM, 81-8C PM
01-0C AM, 81-8C PM
BINARY DATA
MODE
00-3B
00-3B
00-3B
00-3B
01-0C
00-17
00-17
01-07
01-1F
00-63
00-63
01-1F
RANGE
01-12 AM, 81-92 PM
01-12 AM, 81-92 PM
BCD DATA
MODE
00-59
00-59
00-59
00-59
00-23
00-23
01-07
01-31
01-12
00-99
00-99
01-31