DS3231 datasheet(19/20 Pages) MAXIM

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Extremely Accurate I2C-Integrated

RTC/TCXO/Crystal

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Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

1/05

Initial release.

—

Changed Digital Temp Sensor Output from

±2°C to ±3°C.

1, 3

Updated Typical Operating Circuit.

Changed TA = -40°C to +85°C to TA = TMIN to TMAX.

2, 3, 4

2/05

Updated Block Diagram.

Added “UL Recognized” to Features; added lead-free packages and removed S from

top mark info in Ordering Information table; added ground connections to the N.C. pin

in the Typical Operating Circuit.

Added “noncondensing” to operating temperature range; changed VPF MIN from 2.35V

to 2.45V.

Added aging offset specification.

Relabeled TOC4.

Added arrow showing input on X1 in the Block Diagram.

Updated pin descriptions for VCC and VBAT.

Added the I2C Interface section.

Figure 1: Added sign bit to aging and temperature registers; added MSB and LSB.

Corrected title for rate select bits frequency table.

Added note that frequency stability over temperature spec is with aging offset register

= 00h; changed bit 7 from Data to Sign (Crystal Aging Offset Register).

Changed bit 7 from Data to Sign (Temperature Register); correct pin definitions in I2C

Serial Data Bus section.

6/05

Modified the Handing, PC Board Layout, and Assembly section to refer to

J-STD-020 for reflow profiles for lead-free and leaded packages.

11/05

Changed lead-free packages to RoHS-compliant packages.

Changed

RST and UL bullets in Features.

Changed EC condition “VCC > VBAT” to “VCC = Active Supply (see Table 1).”

2, 3

Modified Note 12 to correct tREC operation.

Added various conditions text to TOCs 1, 2, and 3.

Added text to pin descriptions for 32kHz, VCC, and

RST.

Table 1: Changed column heading “Powered By” to “Active Supply”; changed

“applied” to “exceeds VPF” in the Power Control section.

Indicated BBSQW applies to both SQW and interrupts; simplified temp convert

description (bit 5); added “output” to

INT/SQW (bit 2).

10/06

Changed the Crystal Aging section to the Aging Offset section; changed “this bit

indicates” to “this bit controls” for the enable 32kHz output bit.

Added Warning note to EC table notes; updated Note 12.

Updated the Typical Operating Characteristics graphs.

In the Power Control section, added information about the POR state of the time and

date registers; in the Real-Time Clock section, added to the description of the RST

function.

4/08

In Figure 1, corrected the months date range for 04h from 00–31 to 01–31.

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