User Manual

DS3234
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
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Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 2/06 Initial release —
Clarified the behavior of t
REC
on initial power-up in the RST description of the Pin
Description
8
1 7/07
Corrected the POR for the BB32kHz bit from 0 to 1 15
Updated the Typical Operating Circuit 1
Removed the V
PU
parameter from the Recommended DC Operating Conditions
table and added verbiage about the pullup to the Pin Description table for
INT/SQW
2, 8
In the Electrical Characteristics table, added CRATE1 = CRATE0 = 0 to the I
BATT
parameter and changed the symbols for Timekeeping Battery Current,
Temperature Conversion Current, and Data-Retention Current from I
BAT
, I
TC
, and
I
BATTC
to I
BATT
, I
BATTC
, and I
BATTDR
, respectively
3
In the AC Electrical Characteristics, changed the t
CWH
specification from 400ns
(max) to 400ns (min)
4
Added the Delta Time and Frequency vs. Temperature graph in the Typical
Operating Characteristics section
7
Updated the Block Diagram 9
Added the V
BAT
Operation section, improved some sections of text for the
Pushbutton Reset Function, Aging Offset Register (10h/90h), and Temperature
Registers (11h–12h) sections
10, 16
2 10/08
Corrected the description of when the countdown chain is reset in the Clock and
Calendar section
11
3 7/10
In the Absolute Maximum Ratings section, added the theta-JA and theta-JC
thermal resistances and Note 1, and changed the soldering temperature to
+260°C; changed the 10-hour bit to 20-hour bit in the Clock and Calendar section
and Table 1; updated the BBSQW bit description in the Control Register
(0Eh/8Eh) section; added the land pattern no. to the Package Information table
2–5, 8, 11, 12,
14, 20