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參數(shù)資料
| 型號： | DS2404B |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ECONORAM TIMECHIP 5.5V 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 77 |
| 系列： | EconoRAM |
| 類型： | 二進(jìn)制計(jì)數(shù)器 |
| 特點(diǎn)： | 警報器，方波輸出 |
| 時間格式： | 二進(jìn)制 |
| 數(shù)據(jù)格式： | 二進(jìn)制 |
| 接口： | 1 線和 3 線 |
| 電源電壓： | 2.8 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
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DS2404
13 of 29
The write protect bits, once set, permanently write protects their corresponding counter and alarm
registers, all write protect bits, and certain control register bits as shown in Figure 7. The time/count
registers will continue to count if the oscillator is enabled. If the user wishes to set more than one write
protect bit, the user must set them at the same time. Once a write protect bit is set it cannot be undone,
and the remaining write protect bits, if not set, cannot be set.
The programmable expiration takes place when one or more write protect bits have been set and a
corresponding alarm occurs. If the RO (read only) bit is set, only the read scratchpad and read memory
function commands are available. If the RO bit is a logic “0”, no memory function commands are
available. The ROM functions are always available.
WRITE PROTECT CHART Figure 7
WRITE PROTECT BIT SET:
WPR
WPI
WPC
Data Protected from
User Modification:
Real Time Clock
Real Time Alarm
WPR
WPI
WPC
RO
OSC *
Interval Timer
Interval Time Alarm
WPR
WPI
WPC
RO
OSC *
STOP/ START **
AUTO/ MAN
Cycle Counter
Cycle Counter Alarm
WPR
WPI
WPC
RO
OSC *
DSEL
* Becomes write “1” only, i.e., once written to a logic “1”, may not be written back to a logic “0”.
** Forced to a logic “0”.
1-WIRE BUS SYSTEM
The 1-Wire bus is a system which has a single bus master and one or more slaves. In most instances the
DS2404 behaves as a slave. The exception is when the DS2404 generates an interrupt due to a
timekeeping alarm. 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. For a more detailed protocol description, refer to Chapter 4 of
the Book of DS19XX iButton Standards.
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 3-state outputs. The 1-Wire port of the DS2404 (I/O pin 5) is open drain with an internal circuit
equivalent to that shown in Figure 8. A multidrop bus consists of a 1-Wire bus with multiple slaves
attached. The 1-Wire bus has a maximum data rate of 16.3k bits per seconds. Depending on 1-Wire
communication speed and bus load characteristics, the optimal pull-up resistor value will be in the 1.5 k
Ω
to 5 k
Ω range.
The idle state for the 1-Wire bus is high. If for any reason 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 120
μs, one or more of the devices on the bus may be reset.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2415P+T&R | IC TIME CHIP 1-WIRE 6-TSOC |
| DS2417X/T&R | IC TIMECHIP W/INTRPT 1WIRE CSP |
| DS26502LN+ | IC T1/E1/J1 64KCC ELEMENT 64LQFP |
| DS26503LN+ | IC T1/E1/J1 BITS ELEMENT 64-LQFP |
| DS3105LN+ | IC TIMING LINE CARD 64-LQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2404B/T&R | 制造商:Maxim Integrated Products 功能描述:ECONORAM/TIME, SSOP16-TRL (GENERIC) - Tape and Reel |
| DS2404B+ | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 512BYTE 16SSOP - Rail/Tube |
| DS2404B+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 512BYTE 16SSOP - Tape and Reel |
| DS2404FP000 | 制造商:Thomas & Betts 功能描述:200A,CON,3P4W,MG,404,3P480V |
| DS2404FP000/DF2029 | 制造商:Thomas & Betts 功能描述:RS DS2404FP000/DF2029 200A,CON,3P4W |
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