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参数资料
| 型号： | DS1922E-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 29/44页 |
| 文件大小： | 0K |
| 描述： | IBUTTON TEMP LOGGER 4KBit 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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DS1922E
iButton High-Temperature Logger with
8KB Data-Log Memory
1-Wire Bus System
The 1-Wire bus is a system that has a single bus mas-
ter and one or more slaves. In all instances the
DS1922E is a slave device. The bus master is typically
a microcontroller. The discussion of this bus system is
broken down into three topics: hardware configuration,
transaction sequence, and 1-Wire signaling (signal
types and timing). The 1-Wire protocol defines bus
transactions in terms of the bus state during specific
time slots that are initiated on the falling edge of sync
pulses from the bus master.
Hardware Configuration
The 1-Wire bus has only a single line by definition; it is
important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device
attached to the 1-Wire bus must have open-drain or
three-state outputs. The 1-Wire port of the DS1922E is
open drain with an internal circuit equivalent to that
shown in Figure 10.
A multidrop bus consists of a 1-Wire bus with multiple
slaves attached. At standard speed the 1-Wire bus has
a maximum data rate of 16.3kbps. The speed can be
boosted to 142kbps by activating the Overdrive Mode.
The DS1922E is not guaranteed to be fully compliant to
the iButton device standard. Its maximum data rate in
standard speed is 15.4kbps and 125kbps in overdrive
V PUP
BUS MASTER
R PUP
speed. The value of the pullup resistor primarily
depends on the network size and load conditions. The
DS1922E requires a pullup resistor of maximum 2.2k Ω
at any speed.
The idle state for the 1-Wire bus is high. If for any rea-
son a transaction needs to be suspended, the bus
must be left in the idle state if the transaction is to
resume. If this does not occur and the bus is left low for
more than 16μs (overdrive speed) or more than 120μs
(standard speed), one or more devices on the bus may
be reset. Note that the DS1922E does not quite meet
the full 16μs maximum low time of the normal 1-Wire
bus overdrive timing. With the DS1922E the bus must
be left low for no longer than 12μs at overdrive to
ensure that no DS1922E on the 1-Wire bus performs a
reset. The DS1922E communicates properly when used
in conjunction with a DS2480B or DS2490 1-Wire driver
and adapters that are based on these driver chips.
Transaction Sequence
The protocol for accessing the DS1922E through the
1-Wire port is as follows:
? Initialization
? ROM Function Command
? Memory/Control Function Command
? Transaction/Data
DS1922E 1-Wire PORT
Rx
DATA
Rx
Tx
Rx = RECEIVE
I L
Tx
Tx = TRANSMIT
Figure 10. Hardware Configuration
Maxim Integrated
OPEN-DRAIN
PORT PIN
100 Ω MOSFET
29
相关PDF资料 |
PDF描述 |
|---|---|
| DS1922L-F5# | IBUTTON TEMP LOGGER |
| DS1923-F5# | IBUTTON TEMP/HUMIDITY LOGGER F5 |
| DS1961S-F3# | IBUTTON EEPROM 1KBit F3 |
| DS1963S-F5+ | IBUTTON MONETARY SHA-1 |
| DS1971-F3+ | IBUTTON EEPROM 256KBIT F3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1922E-F5# | 功能描述:iButton Temp Logger Ibutton w/8Kb Datalog Mem 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 |
| DS1922F-F5# | 功能描述:iButton DS1922 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 |
| DS1922L | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Temperature Logger iButton with 8KB Data-Log Memory |
| DS1922L_11 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Temperature Logger iButton with 8KB Data-Log Memory |
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