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參數(shù)資料
| 型號(hào)： | DS1921 |
| 英文描述： | High-Resolution Thermochron iButton |
| 中文描述： | 高分辨率Thermochron iButton的 |
| 文件頁(yè)數(shù)： | 37/44頁(yè) |
| 文件大小： | 271K |
| 代理商： | DS1921 |
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DS1921H/Z
37 of 44
STEP 2
Set the EMCLR bit to 1, enable the RTC and then execute the Clear Memory command. The RTC
oscillator must be stable before the Clear Memory command is issued. Wait 500 μs after issuing the Clear
Memory command before proceeding to Step 3. This results in the following data to be written to the
Status Register:
Address:
20Eh
Data:
40h
With only a single DS1921H/Z connected to the bus master, the communication of step 2 is as follows:
MASTER MODE
DATA (LSB FIRST)
TX
(Reset)
RX
(Presence)
TX
CCh
TX
0Fh
TX
0Eh
TX
02h
TX
40h
TX
(Reset)
RX
(Presence)
TX
CCh
TX
AAh
RX
0Eh
RX
02h
RX
0Eh
RX
40h
TX
(Reset)
RX
(Presence)
TX
CCh
TX
55h
TX
0Eh
TX
02h
TX
0Eh
TX
(Reset)
RX
(Presence)
TX
CCh
TX
3Ch
TX
(Reset)
RX
(Presence)
COMMENTS
Reset pulse (480
μ
s to 960
μ
s)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 0Eh
TA2, address = 020Eh
Write status byte to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 0Eh
Read TA2, address = 020Eh
Read E/S, ending offset = 0Eh, flags = 0h
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Copy Scratchpad command
TA1
TA2
(AUTHORIZATION CODE)
E/S
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Clear Memory command
Reset pulse
Presence pulse
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1921H-F5 | High-Resolution Thermochron iButton |
| DS1921Z-F5 | High-Resolution Thermochron iButton |
| DS1963L-F5 | NVRAM (Battery Based) |
| DS1963S | SHA iButton |
| DS1971 | 256-Bit EEPROM iButton |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1921G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Thermochron iButton |
| DS1921G_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Logs Up to 2048 Consecutive Temperature Thermochron iButton |
| DS1921G_1109 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton |
| DS1921G_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton |
| DS1921G-F5 | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
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