DS3065WP datasheet(12/15 Pages) MAXIM

Part #	DS3065WP

Description	3.3V, 8Mb, Nonvolatile SRAM with Clock

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Manufacturer	MAXIM [Maxim Integrated Products]

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3.3V, 8Mb, Nonvolatile SRAM with Clock

12

When the RTC register values match alarm register set-

tings, the alarm flag (AF) is set to 1.

The AE and ABE bits are reset to 0 during the power-up

transition, but an alarm generated during power-up sets

AF to 1. Therefore, the AF bit can be read after system

power-up to determine if an alarm was generated during

the power-up sequence. Figure 1 illustrates alarm timing

during battery-backup mode and power-up states.

Clock Accuracy

The DS3065WP and DS9034I-PCX+ are each individually

tested for accuracy. Once mounted together, the module

typically keeps time accuracy to within Q1.53 minutes

per month (35ppm) at +25NC and does not require

additional calibration. For this reason, methods of field

clock calibration are not available and not necessary.

The electrical environment also affects clock accuracy,

and caution should be taken to place the component in

the lowest level EMI section of the PCB layout. For addi-

tional information, refer to Application Note 58: Crystal

Considerations with Dallas Real-Time Clocks (RTCs).

Power-On Default States

Upon each application of power to the device, the fol-

lowing register bits are automatically set to 0: WDS = 0,

BMB[4:0] = 0, RB0 = 0, RB1 = 0, AE = 0, ABE = 0. All

other RTC bits are undefined.

Data-Retention Mode

The device provides full functional capability for VCC

greater than 3.0V and write protects by 2.8V. Data is

maintained in the absence of VCC without additional sup-

port circuitry. The NV SRAM constantly monitors VCC.

Should the supply voltage decay, the NV SRAM auto-

matically write protects itself. All inputs become don’t

care, and all data outputs become high impedance. As

VCC falls below approximately 2.5V (VSW), the power-

switching circuit connects the lithium energy source to

the clock and SRAM to maintain time and retain data.

During power-up, when VCC rises above VSW, the pow-

er-switching circuit connects external VCC to the clock

and SRAM and disconnects the lithium energy source.

Normal clock or SRAM operation can resume after VCC

exceeds VTP for a minimum duration of tREC.

Freshness Seal

When the DS9034I-PCX+ battery cap is first attached to

a DS3065WP base, the RTC oscillator is disabled and

the lithium battery is electrically disconnected, guaran-

teeing that no battery capacity has been consumed dur-

ing transit or storage.

When VCC is first applied at a level greater than VTP,

the lithium battery is enabled for backup operation. The

user is required to enable the oscillator (MSB of the

SECONDS register) and initialize the required RTC reg-

isters for proper timekeeping operation.

Figure 1. Battery-Backup Mode Alarm Waveforms

VCC

VTP

ABE, AE

AF

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