watchdog timer is hitwd. To hold the watchdog timer at bay, make a c" />
參數(shù)資料
型號(hào)： 20-101-0732
廠商： Rabbit Semiconductor
文件頁數(shù)： 48/126頁
文件大?。?/td> 0K
描述： INTERFACE SMART SCREEN OP7100
標(biāo)準(zhǔn)包裝： 1
系列： SBC
模塊/板類型： 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品： OP7100
其它名稱： 20-101-732
20-101-732-ND
OP7100
28
Hardware
watchdog timer is hitwd. To hold the watchdog timer at bay, make a call to
hitwd
in a routine that runs periodically at the lowest software priority level.
A program can read the state of the WDO line with a call to wderror. This
makes it possible to determine whether a watchdog timeout occurred. The
following sample program shows how to do this when a program starts or
restarts.
main(){
if( wderror() ) wd_cleanup();
hitwd();
...
}
Power Shutdown and Reset
When VCC (+5 V) drops below V
MIN (between 4.5 V and 4.75 V), the
ADM691 supervisor asserts /RESET and holds it until VCC goes above
V
MIN and stays that way for at least 50 ms. This delay allows the system’s
devices to power up and stabilize before the CPU starts.
PFI “Early Warning”
When PFI drops below 1.3 V ± 0.05 V (i.e., DCIN drops below ~10 V),
the supervisor asserts /NMI (nonmaskable interrupt), and allows the
program to clean up and get ready for shutdown. The underlying assump-
tion here is that PFI will cause the interrupt during a power failure before
the ADM691 asserts /RESET.
In order to improve the performance of the power-failure interrupt circuit,
we have added some hysteresis to the power-failure comparator by adding
a resistor, R34, between the comparator input and output pins. R34 can be
found on the 175-0196 and the 175-0211 versions of the OP7100. The
hysteresis prevents the comparator from switching rapidly—and therefore
generating multiple interrupts—when the input voltage is falling slowly.
Once the comparator switches (DC IN falls to approximately 8.5 V), this
feedback holds the input (PFI) low and prevents further interrupts from
being generated. At this point, the 5 V regulator still has sufficient voltage to
keep the processor operating, so that an interrupt service routine can
perform shutdown tasks and “tidying up” before the Vcc line fails. The
comparator will not turn the output (PFO) high until DC IN has risen to
about 9.2 V. The hysteresis will also help prevent any system oscillation in
adverse power supply/loading situations.
The voltage at which the power-failure interrupt occurs may be changed by
adjusting the values of R29 and R30, which are shown in Figure 3-3. To
calculate the values of these components, let V
L be the voltage at which
PFO turns off as DC IN falls, and let V
H be the voltage at which PFO turns
on as DC IN rises.
相關(guān)PDF資料
PDF描述
395-030-527-804 CARD EDGE 30POS DL .100X.200 BLK
395-030-527-802 CARD EDGE 30POS DL .100X.200 BLK
395-030-527-801 CARD EDGE 30POS DL .100X.200 BLK
395-030-527-204 CARD EDGE 30POS DL .100X.200 BLK
395-030-527-202 CARD EDGE 30POS DL .100X.200 BLK
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
20-101-0737 制造商:Digi International 功能描述:SMARTBLOCK OEM W/RTC - MOQ: 50 - Bulk 制造商:Digi International Inc 功能描述:SMARTBLOCK OEM W/RTC MOQ: 50 制造商:Rabbit Semiconductor 功能描述:Smartblock OEM w/RTC
20-101-0738 功能描述:單板計(jì)算機(jī) SR9150 Eth 512K SRAM RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲(chǔ)容量:2 GB (max) 存儲(chǔ)類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm
20-101-0739 制造商:Digi International 功能描述:BL1700 16IN/16OUT 512K SRAM 256K FLASH - MOQ: 25 - Boxed Product (Development Kits) 制造商:Digi International Inc 功能描述:ETH CTLR BL1700 16I/O 256K FLASH 制造商:Rabbit Semiconductor 功能描述:BL1700 512K SRAM 16 In/Out 256K Flash
20-101-0743 制造商:Digi International Inc 功能描述:SMARTBLOCK OEM W/RTC (ROHS) 制造商:Digi International 功能描述:SMARTBLOCK OEM W/RTC - MOQ: 50 - Bulk 制造商:Digi International Inc 功能描述:SMARTBLOCK OEM W/RTC MOQ: 50 制造商:Rabbit Semiconductor 功能描述:Smartblock OEM w/RTC
20-101-0749 功能描述:單板計(jì)算機(jī) 16 I/O 128K SRAM RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲(chǔ)容量:2 GB (max) 存儲(chǔ)類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。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。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

我的聯(lián)系方式

*
*
*