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參數(shù)資料
| 型號： | DS28EA00U+T&R |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 10/29頁 |
| 文件大?。?/td> | 328K |
| 描述： | IC THERMOMETER 1-WIRE 8-USOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 功能： | 溫度計(jì)，恒溫計(jì) |
| 傳感器類型： | 內(nèi)部 |
| 感應(yīng)溫度： | -40°C ~ 85°C |
| 精確度： | ±0.5°C（最小值） |
| 拓?fù)洌?/td> | 寄存器庫，變簽式暫存器 |
| 輸出類型： | 數(shù)字 |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
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The power-on default chain state is OFF, where PIOA
and PIOB are solely controlled through the PIO Access
Read and Write commands. In the chain ON state,
PIOA is pulled high to the devices internal V
DD
supply
through an approximately 40k?resistor, applying a
logic 1 to the PIOB (EN) pin of the next device. Only in
the ON state does a DS28EA00 respond to the
Conditional Read ROM command, provided its EN is at
logic 0. After a devices ROM registration number is
read, it is put into the chain DONE state, which enables
the next device in the chain to respond to the
Conditional Read ROM command.
At the beginning of the sequence discovery process, all
devices are put into the chain ON state. As the discov-
ery progresses, one device after another is transitioned
into the DONE state until all devices are identified.
Finally, all devices are put into the chain OFF state,
which releases the PIO pins and restores their power-
on default state.
Control Function Commands
Figure 9 shows the protocols necessary for measuring
temperatures, accessing the memory and PIO pins,
and changing the chain state. Examples on how to use
these and other functions are included at the end of this
document. The communication between master and
DS28EA00 takes place either at standard speed
(default, OD = 0) or at overdrive speed (OD = 1). If not
explicitly set into the overdrive mode after power-up,
the DS28EA00 communicates at standard speed.
Write Scratchpad [4Eh]
This command allows the master to write 3 bytes of
data to the scratchpad of the DS28EA00. The first data
byte is associated with the TH register (byte address
2), the second byte is associated with the TL register
(byte address 3), and the third byte is associated with
the Configuration register (byte address 4). Data must
be transmitted least significant bit first. All 3 bytes must
be written before the master issues a reset, or the data
can be corrupted.
Read Scratchpad [BEh]
This command allows the master to read the contents
of the scratchpad. The data transfer starts with the least
significant bit of the Temperature Readout register at
byte address 0 and continues through the remaining 7
bytes of the scratchpad. If the master continues read-
ing, it gets a ninth byte, which is an 8-bit CRC of all the
data in the scratchpad. This CRC is generated by the
DS28EA00 and uses the same polynomial function as is
used with the ROM registration number. The CRC is
transmitted in its true (noninverted) form. The master
can issue a reset to terminate the reading early if only
part of the scratchpad data is needed.
Copy Scratchpad [48h]
This command copies the contents of the scratchpad
byte addresses 2 to 4 (TH, TL, and Configuration regis-
ters) to the backup EEPROM. If the device has no V
DD
power, the master must enable a strong pullup on the
1-Wire bus for the duration of t
PROGMAX
within 10祍
after this command is issued. If the device is powered
through the V
DD
pin, the master can generate read time
slots to monitor the copy process. Copy is completed
when the master reads 1 bits instead of 0 bits.
Convert Temperature [44h]
This command initiates a temperature conversion.
Following the conversion, the resulting thermal data is
found in the Temperature Readout register in the
scratchpad and the DS28EA00 returns to its low-power
idle state. If the device has no V
DD
power, the master
must enable a strong pullup on the 1-Wire bus for the
duration of the applicable resolution-dependent
t
CONVMAX
within 10祍 after this command is issued. If
the device is powered through the V
DD
pin, the master
can generate read time slots to monitor the conversion
process. The conversion is completed when the master
reads 1 bits instead of 0 bits.
Read Power Mode [B4h]
For Copy Scratchpad and Convert Temperature, the
master needs to know whether the DS28EA00 has V
DD
power available. The Read Power Mode command is
implemented to provide the master with this informa-
tion. After the command code, master issues read time
slots. If the master reads 1s, the device is powered
through the V
DD
pin. If the device is powered through
the 1-Wire line, the master read 0s. The power-supply
sensor samples the state of the V
DD
pin for every time
slot that the master generates after the command code.
Recall EEPROM [B8h]
This command recalls the TH and TL alarm trigger val-
ues and configuration data from backup EEPROM into
their respective locations in the scratchpad. After hav-
ing transmitted the command code, the master can
issue read time slots to monitor the completion of the
recall process. Recall is completed when the master
reads 1 bits instead of 0 bits. The recall occurs auto-
matically at power-up, not requiring any activity by the
master.
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
10
Maxim Integrated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS28EC20 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| DS28EC20 T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| DS28EC20_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:20Kb 1-Wire EEPROM |
| DS28EC20_1203 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| DS28EC20+ | 功能描述:電可擦除可編程只讀存儲器 20Kb 1-Wire 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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