DS1921H データシートの表示（PDF） - Maxim Integrated
部品番号
コンポーネント説明
メーカー
DS1921H
Maxim Integrated
DS1921H Datasheet PDF : 45 Pages
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DS1921H/Z REGISTER PAGE MAP Figure 6
ADDR b7
0200h
0
0201h
0
0202h
0
0203h
0204h
0205h
0206h
0207h
0208h
0209h
0
0
CENT
MS
MM
MH
020Ah MD
020Bh
020Ch
020Dh
b6
b5
b4
b3
b2
b1
b0
10 Seconds
Single Seconds
10 Minutes
Single Minutes
12/24 20h. 10h.
AM/PM
Single Hours
0
0
0
0
Day of Week
0
10 Date
Single Date
0
0
10m.
Single Months
10 Years
Single Years
10 Seconds Alarm
Single Seconds Alarm
10 Minutes Alarm
Single Minutes Alarm
12/24 10ha. 10h.
A/P alm.
Single Hours Alarm
0
0
0
0
Day of Week Alarm
Temperature Low Alarm Threshold
Temperature High Alarm Threshold
Number of Minutes Between Temperature Conversions
020Eh EOSC EMCLR
0
EM
RO
TLS THS TAS
020Fh
(no function, reads 00h)
0210h
(no function, reads 00h)
0211h
Temperature Read Out (Forced Conversion)
0212h
Low Byte
0213h
High Byte
0214h TCB MEMCLR MIP
SIP
0
TLF THF TAF
0215h
Minutes
0216h
Hours
0217h
Date
0218h
Month
0219h
Year
021Ah
Low Byte
021Bh
Center Byte
021Ch
High Byte
021Dh
Low Byte
021Eh
Center Byte
021Fh
High Byte
DS1921H/Z
Function Access*
Real-
Time
Clock
Registers
R/W; R/W**
Real-
Time
Clock
Alarm
Registers
Temp.
Alarms
Sample
Rate
Control
(N/A)
(N/A)
Temp.
Start
Delay
Status
R/W; R/W**
R/W; R/W**
R/W; R**
R/W; R/W**
R; R**
R; R**
R; R**
R/W; R/W**
R/W; R/W
Mission
Time
Stamp
R; R
Mission
Samples
Counter
Device
Samples
Counter
R; R
R; R
*The first entry in column ACCESS is valid between missions. The second entry shows the applicable
access mode while a mission is in progress.
**While a mission is in progress, these addresses can be read. The first attempt to write to these registers
(even read-only ones), however, will end the mission and overwrite selected writeable registers.
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.
6 of 45
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