DS1689SN+ Maxim Integrated, DS1689SN+ Datasheet
DS1689SN+
Specifications of DS1689SN+
Related parts for DS1689SN+
DS1689SN+ Summary of contents
Page 1
... DS1689S/T&R 0°C to +70°C DS1689S+T&R 0°C to +70°C DS1689SN/T&R -40°C to +85°C DS1689SN+T&R -40°C to +85°C DS1693 0°C to +70°C + Denotes a lead-free/RoHS-compliant device “+” anywhere on the top mark denotes a lead-free/RoHS-compliant device. An “N” denotes an industrial temperature device. ...
Page 2
PIN DESCRIPTION PIN NAME SO EDIP BAUX 2, 3 — X1, X2 RCLR 4 4 5–12 5–12 AD0–AD7 FUNCTION Auxiliary Battery Supply. Auxiliary battery input required for kickstart and wake-up features. This input also supports clock/calendar and ...
Page 3
PIN NAME SO EDIP 13 13 PWR 14 GND ALE PSEL 22 22 IRQ 23 — V BAT FUNCTION Active-Low Power-On Interrupt ...
Page 4
PIN NAME SO EDIP 24 24 SQW CCO CCI 27 27 CEO 28 28 CEI 2, 3, — N.C. 19, 23 FUNCTION Square-Wave Output. The SQW pin can output a signal from one of ...
Page 5
DETAILED DESCRIPTION The DS1689/DS1693 are real-time clocks (RTCs) designed as successors to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real-time clocks. These devices provide the industry standard DS1285 clock function with the new feature of either +3.0V or ...
Page 6
Figure 1. DS1689/DS1693 Block Diagram ...
Page 7
POWER-DOWN/POWER-UP CONSIDERATIONS The real-time clock function will continue to operate and all of the RAM, time, calendar, and alarm memory locations remain nonvolatile regardless of the level of the V the DS1689/DS1693 and reaches a level of greater than V ...
Page 8
Figure 2. DS1689 Real-Time Clock Address Map TIME, CALENDAR, AND ALARM LOCATIONS The time and calendar information is obtained by reading the appropriate register bytes shown in Table 1. The time, calendar, and alarm are set or initialized by writing ...
Page 9
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 ...
Page 10
The application software can select which interrupts, if any, are to be used. A total of 6 bits, including 3 bits in Register B and 3 bits in Extended Register B, enable the interrupts. The extended register locations are described ...
Page 11
A pattern of 01X in the DV2, DV1, and DV0, bits respectively, turns the oscillator on and enables the countdown chain. Note that this is different than the DS1287, which required a pattern of 010 in these bits. DV0 is ...
Page 12
Table 2. Periodic Interrupt Rate and Square-Wave Output Frequency EXT. REG. B SELECT BITS REGISTER A E32K RS3 ...
Page 13
REGISTER A MSB BIT 7 BIT 6 UIP DV2 Bit 7: UIP (Update In Progress). This bit is a status flag that can be monitored. When the UIP bit is 1, the update transfer will soon occur. When UIP is ...
Page 14
REGISTER B MSB BIT 7 BIT 6 SET PIE Bit 7: SET. When the SET bit is 0, the update transfer functions normally by advancing the counts once per second. When the SET bit is written to 1, any update ...
Page 15
REGISTER C MSB BIT 7 BIT 6 IRQF PF Bit 7: IRQF (Interrupt Request Flag). This bit is set to 1 when one or more of the following are true PIE = AIE = 1 ...
Page 16
EXTENDED FUNCTIONS The extended functions provided by the DS1689/DS1693 that are new to the RAMified RTC family are accessed via a software-controlled bank-switching scheme, as illustrated in Figure 4. In bank 0, the clock/calendar registers and 50 bytes of user ...
Page 17
Figure 4. DS1689/DS1693 Extended Register Bank Definition ...
Page 18
SILICON SERIAL NUMBER/CUSTOMER SPECIFIC ROM A total of 128 bits are available for use as serial number/ROM. These bits can be used as a 128-bit serial number unique 64-bit serial number and 64-bit customer specific serial number ...
Page 19
The wake-up feature is controlled through the wake-up interrupt enable bit in extended Control Register B (WIE, bank 1, 04BH). Setting WIE to 1 enables the wake-up feature, clearing WIE to 0 disables it. Similarly, the kickstart feature is controlled ...
Page 20
PWR pin active in response to the enabled kickstart or wake-up condition. This is true even if PWR was previously inactive as the result of power being applied by some means ...
Page 21
EXTENDED CONTROL REGISTERS Two extended control registers are provided to supply controls and status information for the extended features offered by the DS1689/DS1693. These are designated as extended control registers A and B and are located in register bank 1, ...
Page 22
Extended Control Register 4B MSB BIT 7 BIT 6 ABE E32K Bit 7: ABE (Auxiliary Battery Enable). This bit, when written to logic 1, enables the V extended functions. Bit 6: E32K (Enable 32.768kHz Output). This bit, when written to ...
Page 23
ELAPSED TIME COUNTERS The DS1689/DS1693 has two 32-bit elapsed time counters, which reside in bank 1 of the RTC registers. To access these counters the DV0 bit in register A must first be set to a logical 1. The V ...
Page 24
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +7.0V Storage Temperature Range………………………………………………………………...-40°C to +70°C Soldering Temperature………………………………………………...260°C for 10 seconds (See Note 18) Soldering Temperature (Surface Mount)…………………………….See IPC/JEDEC J-STD-020 Standard This is a stress rating only and ...
Page 25
DC ELECTRICAL CHARACTERISTICS—5V (Over the operating range.) PARAMETER Average V Power-Supply Current CC CMOS Standby Current ( 0.2V) CC Input Leakage Current (Any Input) CEI Input Leakage PSEL Input Leakage Output Leakage Current Output Logic 1 Voltage ...
Page 26
DC ELECTRICAL CHARACTERISTICS—3V (Over the operating range.) PARAMETER Average V Power-Supply Current CC CMOS Standby Current ( 0.2V) CC Input Leakage Current (Any Input) CEI Input Leakage PSEL Input Leakage Output Leakage Current Output Logic 1 Voltage ...
Page 27
RTC AC TIMING CHARACTERISTICS—5V (Over the operating range.) PARAMETER Cycle Time Pulse Width, RD/WR Low Pulse Width, RD/WR High Input Rise and Fall Time Chip-Select Setup Time Before Chip-Select Hold Time Read-Data Hold Time Write-Data Hold Time ...
Page 28
RTC AC TIMING CHARACTERISTICS—3V (Over the operating range.) PARAMETER Cycle Time Pulse Width, RD/WR Low Pulse Width, RD/WR High Input Rise and Fall Time Chip-Select Setup Time Before Chip-Select Hold Time Read-Data Hold Time Write-Data Hold Time ...
Page 29
POWER-UP/POWER-DOWN TIMING— +25°C) A PARAMETER CS High to Power-Fail Recovery at Power-Up V Slew Rate Power-Down CC V Slew Rate Power-Down CC V Slew Rate Power-Up CC Expected Data Retention POWER-UP/POWER-DOWN TIMING— +25°C) A PARAMETER CS ...
Page 30
POWER-UP CONDITION—5V OPERATION POWER-DOWN CONDITION—5V OPERATION ...
Page 31
POWER-UP CONDITION—3V OPERATION POWER-DOWN CONDITION—3V OPERATION ...
Page 32
WAKE-UP/KICKSTART TIMING (T = +25°C) A PARAMETER Kickstart Input Pulse Width Wake-Up/Kickstart Power-On Timeout WAKE-UP/KICKSTART TIMING NOTE: TIME INTERVALS SHOWN ABOVE ARE REFERENCED IN WAKE-UP/KICKSTART SECTION. *THIS CONDITION CAN OCCUR WHEN THE DEVICE IS OPERATED IN 3V MODE. SYMBOL MIN ...
Page 33
NOTES: 1) All voltages are referenced to ground. 2) Typical values are at +25°C and nominal supplies. 3) Outputs are open. 4) Value for voltage and currents is from the V 5) Write protection trip point occurs during power fail ...
Page 34
PACKAGE INFORMATION (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/DallasPackInfo ...
Page 35
PACKAGE INFORMATION (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/DallasPackInfo ...
Page 36
... The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. ...