參數(shù)資料
型號(hào)： DS1670E
英文描述： Portable System Controller
中文描述： 便攜式系統(tǒng)控制器
文件頁(yè)數(shù)： 9/17頁(yè)
文件大小： 252K
代理商： DS1670E
DS1670
9 of 17
The third microprocessor monitoring function provided by the DS1670 is a watchdog timer. The
watchdog timer function forces
RST
to the active state when the ST input is not stimulated within the
predetermined time period. The time period is set by the Time Delay (TD) bits in the Watchdog Register.
The time delay can be set to 250 ms, 500 ms, or 1000 ms (see Figure 5). If TD0 and TD1 are both set to
0, the watchdog timer is disabled. When enabled, the watchdog timer starts timing out from the set time
period as soon as
RST
is inactive. The default setting is for the watchdog timer to be enabled with
1000 ms time delay. If a high-to-low transition occurs on the
ST
input pin prior to time-out, the
watch-dog timer is reset and begins to time-out again. If the watchdog timer is allowed to time-out, then
the
RST
signal is driven to the active state for 250 ms (typical). The
ST
input can be derived from
microprocessor address signals, data signals, and/or control signals. To guarantee that the watchdog
timer does not time-out, a high-to-low transition must occur at or less than the minimum
period.
WATCHDOG TIME-OUT CONTROL
Figure 5
WATCHDOG REGISTER
BIT 7
BIT 6
0
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
TD1
BIT 0
TD0
0
WATCHDOG TIME-OUT
TD1
TD0
0
0
0
1
1
0
1
1
WATCHDOG TIME-OUT
Watchdog disabled
250 ms
500 ms
1000 ms
ANALOG-TO-DIGITAL CONVERTER
The DS1670 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 A/D converter 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 A/D
converter 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 DS1670 has a FSV of 2.55V (typical) which provides a
resolution of 10 mV. 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 A/D converter is ±0.5 LSB.
The A/D converter 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 A/D 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 ms. An internal
analog filter at the input reduces high frequency noise. Subsequent updates occur approximately every
10 ms. If AIS0 and/or AIS1 are changed, updates will occur at the next 10 ms conversion time.
相關(guān)PDF資料
PDF描述
DS1670S Portable System Controller
DS17285 3V/5V Real-Time Clock
DS17285-3 3V/5V Real-Time Clock
DS17285-5 3V/5V Real-Time Clock
DS17285E-3 3V/5V Real-Time Clock
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1670E/T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller
DS1670E/T&R 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
DS1670E/TR 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Portable System Controller
DS1670E+ 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
DS1670E+T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*