參數(shù)資料
型號(hào)： 101-0412
廠商： Rabbit Semiconductor
文件頁(yè)數(shù)： 74/90頁(yè)
文件大?。?/td> 0K
描述： INTERFACE PROG 12KEY DISP OP6700
標(biāo)準(zhǔn)包裝： 25
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： OP6700
72
Intellicom (OP6600/OP6700)
The current drain on the battery in a battery-backed circuit must be kept at a minimum.
When the Intellicom is not powered, the battery keeps the SRAM memory contents and
the real-time clock (RTC) going. The SRAM has a powerdown mode that greatly reduces
power consumption. This powerdown mode is activated by raising the chip select (CS)
signal line. Normally the SRAM requires Vcc to operate. However, only 2 V is required
for data retention in powerdown mode. Thus, when power is removed from the circuit, the
battery voltage needs to be provided to both the SRAM power pin and to the CS signal
line. The CS control circuit accomplishes this task for the CS signal line.
In a powered-up condition, the CS control circuit must allow the processor’s chip select
signal /CS1 to control the SRAM’s CS signal /CSRAM. So, with power applied, /CSRAM
must be the same signal as /CS1, and with power removed, /CSRAM must be held high
(but only needs to be battery voltage high). Q5 and Q6 are MOSFET transistors with
opposing polarity. They are both turned on when power is applied to the circuit. They
allow the CS signal to pass from the processor to the SRAM so that the processor can peri-
odically access the SRAM. When power is removed from the circuit, the transistors will
turn off and isolate /CSRAM from the processor. The isolated /CSRAM line has a 100 k
pullup resistor to VRAM (R29). This pullup resistor keeps /CSRAM at the VRAM voltage
level (which under no power condition is the backup battery’s regulated voltage at a little
more than 2 V).
Transistors Q5 and Q6 are of opposite polarity so that a rail-to-rail voltage can be passed.
When the /CS1 voltage is low, Q5 will conduct. When the /CS1 voltage is high, Q6 will
conduct. It takes time for the transistors to turn on, creating a propagation delay. This
delay is typically very small, about 10 ns to 15 ns.
The signal that turns the transistors on is a high on the processor’s reset line, /RES. When
the Intellicom is not in reset, the reset line will be high, turning on n-channel Q5 and Q7.
Q7 is a simple inverter needed to turn on Q6, a p-channel MOSFET. When a reset occurs,
the /RES line will go low. This will cause C14 to discharge through R32 and R34. This
small delay (about 160 s) ensures that there is adequate time for the processor to write
any last byte pending to the SRAM before the processor puts itself into a reset state. When
coming out of reset, CS will be enabled very quickly because D1 conducts to charge
capacitor C14.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
101-0413 功能描述:開發(fā)軟件 DYNAMIC C SOFTWARE RoHS:否 制造商:Atollic Inc. 產(chǎn)品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
101-0414 功能描述:界面開發(fā)工具 OP6700 RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
101-0415 功能描述:KIT TOOL FOR OP6700 INTL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:Intellicom 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
101-0416-000 制造商:ITT Interconnect Solutions 功能描述:INSUL CA-KE18-1P FR / 101-0416-000 / Circular
101-0417 功能描述:開發(fā)板和工具包 - 其他處理器 USE 694-101-0580 RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評(píng)估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓:
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