DS3231 Maxim, DS3231 Datasheet - Page 19

• Manufacturer Part Number: DS3231
• Description: The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal
• Manufacturer: Maxim

REVISION
NUMBER
0
1
2
3
4
5
REVISION
DATE
11/05
10/06
1/05
2/05
6/05
4/08
Initial release.
Changed Digital Temp Sensor Output from ±2°C to ±3°C.
Updated Typical Operating Circuit.
Changed T
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 V
to 2.45V.
Added aging offset specification.
Relabeled TOC4.
Added arrow showing input on X1 in the Block Diagram.
Updated pin descriptions for V
Added the I
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 I
Serial Data Bus section.
Modified the Handing, PC Board Layout, and Assembly section to refer to
J-STD-020 for reflow profiles for lead-free and leaded packages.
Changed lead-free packages to RoHS-compliant packages.
Changed
Changed EC condition “V
Modified Note 12 to correct t
Added various conditions text to TOCs 1, 2, and 3.
Added text to pin descriptions for 32kHz, V
Table 1: Changed column heading “Powered By” to “Active Supply”; changed
“applied” to “exceeds V
Indicated BBSQW applies to both SQW and interrupts; simplified temp convert
description (bit 5); added “output” to
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.
In Figure 1, corrected the months date range for 04h from 00–31 to 01–31.
Extremely Accurate I
A
2
C Interface section.
= -40°C to +85°C to T
and UL bullets in Features.
____________________________________________________________________
PF
CC
” in the Power Control section.
REC
> V
CC
BAT
operation.
and V
A
” to “V
DESCRIPTION
= T
BAT
MIN
/SQW (bit 2).
CC
.
CC
to T
= Active Supply (see Table 1).”
, and
MAX
.
RTC/TCXO/Crystal
.
2
PF
C-Integrated
MIN from 2.35V
Revision History
2
C
CHANGED
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1, 3
2, 3
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