參數(shù)資料
型號(hào)： DS1631A
英文描述： High-Precision Digital Thermometer and Thermostat
中文描述： 高精度數(shù)字溫度計(jì)和溫度監(jiān)控器
文件頁(yè)數(shù)： 3/19頁(yè)
文件大?。?/td> 288K
代理商： DS1631A
DS1244/DS1244P
3 of 19
RAM READ MODE
The DS1244 executes a read cycle whenever
WE(write enable) is inactive (high) and CE (chip enable)
is active (low). The unique address specified by the 15 address inputs (A0–A14) defines which of the
32,768 bytes of data is to be accessed. Valid data is available to the eight data-output drivers within t
ACC
(access time) after the last address input signal is stable, providing that CE and OE (output enable)
access times and states are also satisfied. If OE and CE access times are not satisfied, then data access
must be measured from the later occurring signal (CE or OE) and the limiting parameter is either t
CO
for
CE or t
OE
for OE, rather than address access.
RAM WRITE MODE
The DS1244 is in the write mode whenever the WE and CE signals are in the active (low) state after
address inputs are stable. The latter occurring falling edge of CE or WE will determine the start of the
write cycle. The write cycle is terminated by the earlier rising edge of CE or WE. All address inputs
must be kept valid throughout the write cycle. WE must return to the high state for a minimum recovery
time (t
WR
) before another cycle can be initiated. The OE control signal should be kept inactive (high)
during write cycles to avoid bus contention. However, if the output bus has been enabled (CE and OE
active) then WE will disable the outputs in t
ODW
from its falling edge.
DATA RETENTION MODE
The 5V device is fully accessible and data can be written or read only when V
CC
is greater than V
PF
.
However, when V
CC
is below the power fail point, V
PF
(point at which write protection occurs), the
internal clock registers and SRAM are blocked from any access. When V
CC
falls below the battery switch
point, V
SO
(battery supply level), device power is switched from the V
CC
pin to the backup battery. RTC
operation and SRAM data are maintained from the battery until V
CC
is returned to nominal levels.
The 3.3V device is fully accessible and data can be written or read only when V
CC
is greater than V
PF
.
When V
CC
fall as below the V
PF
, access to the device is inhibited. If V
PF
is less than V
BAT
, the device
power is switched from V
CC
to the backup supply (V
BAT
) when V
CC
drops below V
PF
. If V
PF
is greater
than V
BAT
, the device power is switched from V
CC
to the backup supply (V
BAT
) when V
CC
drops below
V
BAT
. RTC operation and SRAM data are maintained from the battery until V
CC
is returned to nominal
levels.
All control, data, and address signals must be powered down when V
CC
is powered down.
PHANTOM CLOCK OPERATION
Communication with the phantom clock is established by pattern recognition on a serial bit stream of
64 bits, which must be matched by executing 64 consecutive write cycles containing the proper data on
DQ0. All accesses that occur prior to recognition of the 64-bit pattern are directed to memory.
After recognition is established, the next 64 read or write cycles either extract or update data in the
phantom clock, and memory access is inhibited.
Data transfer to and from the timekeeping function is accomplished with a serial bit stream under control
of the chip enable, output enable, and write enable. Initially, a read cycle to any memory location using
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1631A6B_BAA WAF 制造商:Rochester Electronics LLC 功能描述:
DS1631AU 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS1631AU/T&R 制造商:Maxim Integrated Products 功能描述:0.5C 12C ACTIVE POWER-UP DS1631U - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER DIG HI-PREC 8USOP
DS1631AU/T&R 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS1631AU/TR 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Digital Thermometer and Thermostat
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