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参数资料
| 型号： | DS1923-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 41/55页 |
| 文件大小： | 0K |
| 描述： | IBUTTON TEMP/HUMIDITY LOGGER F5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 5 |
| 系列： | iButton® |
| 存储容量： | 512B |
| 存储器类型： | NVSRAM（非易失 SRAM） |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
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DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
1-Wire Signaling
The DS1923 requires strict protocols to ensure data
integrity. The protocol consists of four types of signaling
on one line: reset sequence with reset pulse and pres-
ence pulse, write-zero, write-one, and read-data. Except
for the presence pulse, the bus master initiates all these
signals. The DS1923 can communicate at two different
speeds: standard speed and overdrive speed. If not
explicitly set into the overdrive mode, the DS1923 com-
municates at standard speed. While in overdrive mode
the fast timing applies to all waveforms.
To get from idle to active, the voltage on the 1-Wire line
needs to fall from V PUP below the threshold V TL . To get
from active to idle, the voltage needs to rise from
V ILMAX past the threshold V TH . The time it takes for the
voltage to make this rise is seen in Figure 12 as “ ε ” and
its duration depends on the pullup resistor (R PUP ) used
and the capacitance of the 1-Wire network attached.
The voltage V ILMAX is relevant for the DS1923 when
determining a logical level, not triggering any events.
The initialization sequence required to begin any com-
munication with the DS1923 is shown in Figure 12. A
reset pulse followed by a presence pulse indicates the
DS1923 is ready to receive data, given the correct ROM
and memory function command. If the bus master uses
slew-rate control on the falling edge, it must pull down
the line for t RSTL + t F to compensate for the edge. A
t RSTL duration of 690μs or longer exits the overdrive
mode, returning the device to standard speed. If the
MASTER Tx "RESET PULSE"
V PUP
V IHMASTER
V TH
V TL
V ILMAX
ε
DS1923 is in overdrive mode and t RSTL is no longer
than 80μs, the device remains in overdrive mode.
After the bus master has released the line, it goes into
receive mode (Rx). Now the 1-Wire bus is pulled to
V PUP through the pullup resistor or, in the case of a
DS2480B driver, through active circuitry. When the
threshold V TH is crossed, the DS1923 waits for t PDH
and then transmits a presence pulse by pulling the line
low for t PDL . To detect a presence pulse, the master
must test the logical state of the 1-Wire line at t MSP .
The t RSTH window must be at least the sum of
t PDHMAX , t PDLMAX , and t RECMIN . Immediately after
t RSTH is expired, the DS1923 is ready for data commu-
nication. In a mixed population network, t RSTH should
be extended to minimum 480μs at standard speed and
48μs at overdrive speed to accommodate other 1-Wire
devices.
Read/Write Time Slots
Data communication with the DS1923 takes place in
time slots that carry a single bit each. Write time slots
transport data from bus master to slave. Read time slots
transfer data from slave to master. The definitions of the
write and read time slots are illustrated in Figure 13.
All communication begins with the master pulling the
data line low. As the voltage on the 1-Wire line falls
below the threshold V TL , the DS1923 starts its internal
timing generator that determines when the data line is
sampled during a write time slot and how long data is
valid during a read time slot.
MASTER Rx "PRESENCE PULSE"
t MSP
0V
t RSTL
t PDH
t PDL
t REC
t F
t RSTH
RESISTOR
Figure 12. Initialization Procedure: Reset and Presence Pulse
Maxim Integrated
MASTER
DS1923
41
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1923-F5# | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog 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 |
| DS1923-F5#W | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog 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 |
| DS1923-F5+ | 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 |
| DS19310 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Color TV Owners Manual Manuel dinstructions du teleouleur Color TV Manual Del Propietario |
| DS193-K | 制造商:Miyama Electric 功能描述: |
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