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參數(shù)資料
| 型號(hào)： | DS1677E+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 18/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR SYSTEM PORT 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 74 |
| 類型： | 便攜系統(tǒng)控制器 |
| 特點(diǎn)： | 警報(bào)器，閏年，監(jiān)視計(jì)時(shí)器 |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 3 線串口 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.5 V ~ 3.7 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
DS1677
9 of 18
ANALOG-TO-DIGITAL CONVERTER
The DS1677 provides a 3-channel 8-bit analog-to-digital converter. The A/D reference voltage (2.55V
typical) is derived from an on-chip band-gap circuit. Three multiplexed analog inputs are provided
through the AIN0, AIN1, and AIN2 pins. The ADC is monotonic (no missing codes) and uses a
successive approximation technique to convert the analog signal into a digital code.
An A/D conversion is the process of assigning a digital code to an analog input voltage. This code
represents the input value as a fraction of the full-scale voltage (FSV) range. Thus, the FSV range is then
divided by the ADC into 256 codes (8 bits). The FSV range is bounded by an upper limit equal to the
reference voltage and the lower limit, which is ground. The DS1677 has a FSV of 2.55V (typical) that
provides a resolution of 10mV. An input voltage equal to the reference voltage converts to FFh while an
input voltage equal to ground converts to 00h. The relative linearity of the ADC is
0.5 LSB.
The ADC selects from one of three different analog inputs (AIN0–AIN2). The input that is selected is
determined by the Analog Input Select (AIS) bits in the Control Register. Table 2 lists the specific analog
input that is selected by these 2 bits. Note also that the converter can be turned off by these bits to reduce
power. When the ADC is turned on by setting AIS0 and AIS1 to any value other than 0,0 the analog input
voltage is converted and written to the ADC Register within 488
s. An internal analog filter at the input
reduces high frequency noise. Subsequent updates occur approximately every 10ms. If AIS0 and/or AIS1
are changed, updates will occur at the next 10ms conversion time.
The Conversion Update In Progress (CU) bit in the Status Register indicates when the ADC Register can
be read. When this bit is a one, an update to the ADC Register will occur within 488
s maximum.
However, when this bit is zero an update will not occur for at least 244
s. The CU bit should be polled
before reading the ADC Register to insure that the contents are stable during a read cycle. Once a read
cycle to the ADC Register has been started, the DS1677 will not update that register until the read cycle
has been completed. It should also be mentioned that taking CS low will abort the read cycle and will
allow the ADC Register to be updated.
Figure 5 illustrates the timing of the CU bit relative to an instruction to begin conversion and the
completion of that conversion.
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參數(shù)描述 |
|---|---|
| DS1677E+ | 功能描述:實(shí)時(shí)時(shí)鐘 Portable System Controller RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1677E-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Portable System Controller(275.85 k) |
| DS1678 | 功能描述:實(shí)時(shí)時(shí)鐘 Real-Time Event Recorder RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1678+ | 功能描述:實(shí)時(shí)時(shí)鐘 Real-Time Event Recorder RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1678J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-Input Digital Multiplexer |
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