DS1921H/Z Maxim Integrated Products, DS1921H/Z Datasheet - Page 6

• Manufacturer Part Number: DS1921H/Z
• Description: High Resolution Thermochron Ibutton Range H
• Manufacturer: Maxim Integrated Products

DS1921H/Z REGISTER PAGE MAP Figure 6
*The first entry in column ACCESS TYPE is valid between missions. The second entry shows the
applicable access type while a mission is in progress.
**While a mission is in progress, these addresses can be read. The first write-attempt, however, will end
the mission, but not overwrite any settings.
TIMEKEEPING
The RTC/alarm and calendar information is accessed by reading/writing the appropriate bytes in the
register page, address 200h to 206h. Note that some bits are set to 0. These bits will always read 0
regardless of how they are written. The contents of the time, calendar, and alarm registers are in the
Binary-Coded Decimal (BCD) format.
RTC and RTC Alarm Register Bitmap
ADDRESS RANGE
0200h to 0206h
0207h to 020Ah
020Bh
020Ch
020Dh
020Eh
020Fh to 0210h
0211h
0212h to 0213h
0214h
0215h to 0219h
021Ah to 021Ch
021Dh to 021Fh
ADDR
020Ah
0200h
0201h
0202h
0203h
0204h
0205h
0206h
0207h
0208h
0209h
CENT
MM
MH
MD
MS
b7
0
0
0
0
0
12/24
12/24
b6
0
0
0
0
10 Years
10 Seconds Alarm
10 Minutes Alarm
ACCESS TYPE*
10 Seconds
10 Minutes
R/W; R/W
R/W; R**
R/W; R**
R/W; R**
R/W; R**
R/W; R**
R/W; R**
R/W; R**
AM/PM
10ha.
R; R**
R; R**
20h.
A/P
R; R
R; R
R; R
b5
0
0
0
10 Date
10m.
10h.
10h.
alm.
b4
0
0
DESCRIPTION
RTC Registers
RTC Alarm
Temperature Low Alarm Threshold
Temperature High Alarm Threshold
Sample Rate
Control Register
(no function; will read 00h)
Forced Temperature Conversion Readout
Mission Start Delay
Status Register
Mission Time Stamp
Mission Samples Counter
Device Samples Counter
b3
0
0
6 of 40
Single Seconds Alarm
Single Minutes Alarm
Single Hours Alarm
Single Seconds
Single Minutes
Single Months
Single Hours
Single Years
b2
Single Date
Day of Week Alarm
Day of Week
b1
b0