參數(shù)資料
型號： 20-101-0405
廠商： Rabbit Semiconductor
文件頁數(shù)： 68/80頁
文件大?。?/td> 0K
描述： MODULE RABBITCORE RCM2010
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM2010
產(chǎn)品目錄頁面： 620 (CN2011-ZH PDF)
其它名稱： 316-1084
66
RabbitCore RCM2000
C.2 Chip Select Circuit
Figure C-4 shows a schematic of the chip select circuit.
Figure C-4. Chip Select Circuit
The current drain on the battery in a battery-backed circuit must be kept to a minimum.
When the RCM2000 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). Q13 and Q14 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 (R28). This pullup resistor keeps /CSRAM at the VRAM voltage
level (which under no-power conditions is the backup battery’s regulated voltage at a little
more than 2 V).
Transistors Q13 and Q14 are of opposite polarity so that a rail-to-rail voltages can be
passed. When the /CS1 voltage is low, Q13 will conduct. When the /CS1 voltage is high,
Q14 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.
/CS1
/CSRAM
/RES
Q10
Q13
Q14
R15
R28
VRAM
22 kW
C6
R5
100 kW
1 nF
相關(guān)PDF資料
PDF描述
20-101-1093 RCM4110 RABBITCORE
20-101-0453 MODULE RABBITCORE RCM2300
20-101-1235 CORE MODULE RCM5700
11FMN-BMTTR-A-TB CONN FMN HSNG 11POS STAG REV SMD
046232103103800+ CONN FFC/FPC 3POS 1MM R/A SMD
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參數(shù)描述
20-101-0410 功能描述:單板計(jì)算機(jī) OP6700/6600 battery 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 存儲容量:2 GB (max) 存儲類型: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
20-101-0411 功能描述:單板計(jì)算機(jī) OP6700 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 存儲容量:2 GB (max) 存儲類型: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
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20-101-0420 功能描述:模塊配件 FWT27/Pluggable RoHS:否 制造商:Lantronix 產(chǎn)品: 用于:
20-101-0421 功能描述:模塊配件 FWT18/Pluggable RoHS:否 制造商:Lantronix 產(chǎn)品: 用于:
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