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DS1921G
Thermochron iButton Device
32-BYTE INTERMEDIATE STORAGE SCRATCHPAD
ADDRESS
0000h to 01FFh
0200h to 021Fh
0220h to 027Fh
0280h to 07FFh
0800h to 087Fh
0880h to 0FFFh
1000h to 17FFh
1800h to 1FFFh
Figure 5. Memory Map
GENERAL-PURPOSE SRAM (16 PAGES)
32-BYTE REGISTER PAGE
ALARM TIMESTAMPS AND DURATIONS
(RESERVED FOR FUTURE EXTENSIONS)
TEMPERATURE HISTOGRAM MEMORY
(RESERVED FOR FUTURE EXTENSIONS)
DATA-LOG MEMORY (64 PAGES)
(RESERVED FOR FUTURE EXTENSIONS)
PAGES 0 to 15
PAGE 16
PAGES 17 to 19
PAGES 20 to 63
PAGES 64 to 67
PAGES 68 to 127
PAGES128 to 191
PAGES 192 to 255
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
ACCESS*
0200h
0201h
0
0
10 Seconds
10 Minutes
Single Seconds
Single Minutes
0202h
0
12/24
20 Hour
AM/PM
10 Hour
Single Hours
0203h
0
0
0
0
0
Day of Week
RTC
Registers
R/W
R/W**
0204h
0
0
10 Date
Single Date
0205h
CENT
0
0
10
Months
Single Months
0206h
10 Years
Single Years
0207h
0208h
MS
MM
10 Seconds Alarm
10 Minutes Alarm
Single Seconds Alarm
Single Minutes Alarm
0209h
020Ah
MH
MD
12/24
0
20 Hour
AM/PM
Alarm
0
10 Hour
Alarm
0
0
Single Hours Alarm
Day of Week Alarm
RTC Alarm
Registers
R/W
R/W**
020Bh
020Ch
020Dh
Temperature Low Alarm Threshold
Temperature High Alarm Threshold
Number of Minutes Between Temperature Conversions
Temperature
Alarms
Sample Rate
R/W
R/W
R/W**
R**
020Eh
EOSC
EMCLR
0
EM
RO
TLS
THS
TAS
Control
R/W
R/W**
020Fh
(No function, reads 00h)
—
R
R**
*The left entry in the ACCESS column is valid between missions. The right 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, ends the mission and overwrites selected writable registers.
Figure 6. Register Pages Map
10
Maxim Integrated
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相关代理商/技术参数
DS1921G-F5#W
功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A0C
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A12
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A12-W
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A14
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A15
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A17
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A1B
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated