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參數(shù)資料
| 型號： | 20-101-0556 |
| 廠商： | Rabbit Semiconductor |
| 文件頁數(shù)： | 81/94頁 |
| 文件大?。?/td> | 0K |
| 描述： | COMPUTER SNGL BD BL2000 IDC HDR |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | SBC |
| 模塊/板類型： | 單板計算機模塊 |
| 適用于相關(guān)產(chǎn)品： | BL2000 |
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78
Wildcat (BL2000)
C.3 Chip Select Circuit
Figure C-5 shows a schematic of the chip select circuit.
Figure C-5. Chip Select Circuit
The current drain on the battery in a battery-backed circuit must be kept at a minimum.
When the BL2000 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 SRAM’s chip select 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). Q3 and Q4 are MOSFET transistors with com-
plementary 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 (R101). This pullup resistor keeps /CSRAM at the VRAM volt-
age level (which under no power condition is the backup battery’s regulated voltage at a
little more than 2 V).
/CS1
/CSRAM
/RESET
Q8
Q4
Q3
R101
VRAM
R104
100 kW
22 kW
C81
1 nF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 20-101-0561 | 功能描述:模塊化系統(tǒng) - SOM RCM3400 Rabbit Core RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲容量:8 MB, 16 MB 存儲類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 20-101-0562 | 功能描述:模塊化系統(tǒng) - SOM RCM3410 RABBITCORE RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲容量:8 MB, 16 MB 存儲類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 20-101-0563 | 功能描述:模塊配件 RCM3400 PROTOTYPING BOARD RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| 20-101-0565 | 功能描述:模塊配件 BL2100 W/BTM MNT SOCKETS RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
| 20-101-0566 | 功能描述:模塊配件 BL2100 Friction Lock RoHS:否 制造商:Lantronix 產(chǎn)品: 用于: |
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