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| 型号： | 101-0360 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 68/80页 |
| 文件大小： | 0K |
| 描述： | KIT DEV RABBIT 2000 INT'L |
| 标准包装： | 1 |
| 系列： | RabbitCore 2000 |
| 类型： | MPU 模块 |
| 适用于相关产品： | RCM2000，RCM2010，RCM2020 |
| 所含物品： | RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘 |
| 其它名称： | 101-360 101-360-ND |
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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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 101-0360-000 | 制造商:ITT Interconnect Solutions 功能描述:1010360000 / 101-0360-000 / Circular |
| 10-103-6-05 | 制造商:Concord Electronics Inc 功能描述: |
| 101-0361 | 功能描述:触觉开关 TACTILE SWITCH 6X6MM RoHS:否 制造商:C&K Components 工作力:2 N 执行器:Round 电流额定值:50 mA 电压额定值 DC:32 V 电压额定值 AC: 功率额定值:1 VA 接地端子:Yes 触点形式:SPST-NO 开关功能: 安装风格:SMD/SMT 安装方向:Right 晶体管管座高度: 颜色: 照明:Not Illuminated 照明颜色: 封装: |
| 101-0361-EV | 功能描述:触觉开关 TACTILE SWITCH 6X6MM RoHS:否 制造商:C&K Components 工作力:2 N 执行器:Round 电流额定值:50 mA 电压额定值 DC:32 V 电压额定值 AC: 功率额定值:1 VA 接地端子:Yes 触点形式:SPST-NO 开关功能: 安装风格:SMD/SMT 安装方向:Right 晶体管管座高度: 颜色: 照明:Not Illuminated 照明颜色: 封装: |
| 101-0362 | 功能描述:触觉开关 TACTILE SWITCH 6X6MM RoHS:否 制造商:C&K Components 工作力:2 N 执行器:Round 电流额定值:50 mA 电压额定值 DC:32 V 电压额定值 AC: 功率额定值:1 VA 接地端子:Yes 触点形式:SPST-NO 开关功能: 安装风格:SMD/SMT 安装方向:Right 晶体管管座高度: 颜色: 照明:Not Illuminated 照明颜色: 封装: |
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