參數(shù)資料
型號(hào): DS1825U+T&R
廠商: Maxim Integrated
文件頁(yè)數(shù): 18/21頁(yè)
文件大小: 287K
描述: IC THERMOMETER DIGITAL 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: -55°C ~ 125°C
精確度: ±2°C(最小值)
拓?fù)洌?/td> 寄存器庫(kù),變簽式暫存器
輸出類型: 數(shù)字
輸出警報(bào):
輸出風(fēng)扇: 無(wú)
電源電壓: 3 V ~ 3.7 V
工作溫度: -55°C ~ 125°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)
DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
 
18 of 21
 
 
Figure 16. DETAILED MASTER READ 1 TIMING  
 
 
 
 
 
 
 
 
 
 
 
Figure 17. RECOMMENDED MASTER READ 1 TIMING  
 
 
 
 
 
 
 
 
 
 
 
 
 
DS1825 OPERATION EXAMPLE  
In this example there are multiple DS1825s on the bus and they are using parasite power. The bus master initiates
a temperature conversion in a specific DS1825 and then reads its scratchpad and recalculates the CRC to verify
the data.
 
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
F0h
Master issues Search ROM command and builds
Crossreference Table
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
55h
Master issues Match ROM command for desired address
TX
64-bit ROM code
Master sends DS1825 ROM code.
TX
44h
Master issues Convert T command.
TX
DQ line held high by
strong pullup
Master applies strong pullup to DQ for the duration of the
conversion (t
conv
).
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
55h
Master issues Match ROM command.
TX
64-bit ROM code
Master sends DS1825 ROM code.
TX
BEh
Master issues Read Scratchpad command.
RX
9 data bytes
Master reads entire scratchpad including CRC. The master
then recalculates the CRC of the first eight data bytes from the
scratchpad and compares the calculated CRC with the read
CRC (byte 9). If they match, the master continues; if not, the
read operation is repeated.
V
PU
 
GND
1-WIRE BUS
15 ms
IH of Master
T
RC
T
INT
 > 1 ms
Master samples
LINE TYPE LEGEND
Bus master pulling low
Resistor pullup
V
PU
 
GND
1-WIRE BUS
15 ms
IH of Master
T
RC
=
small
T
INT
 =
small
 
Master samples
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