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参数资料
| 型号： | XR19L210IL40-0A-EB |
| 厂商： | Exar Corporation |
| 文件页数： | 8/43页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XR19L202 40QFN |
| 标准包装： | 1 |
| 系列： | * |
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XR19L210
16
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
REV. 1.0.2
2.17.3
Power-Save Feature
This mode is in addition to the sleep mode and in this mode, the core logic of the L210 is isolated from the CPU
interface. If the address lines, data bus lines, IOW#, IOR# and CS# remain steady when the L210 is in full
sleep mode, the maximum current will be in the microamp range as specified in the DC Electrical
Characteristics on page 32. However, if the input lines are floating or are toggling while the L210 is in sleep
mode, the current can be up to 100 times more. If not using the Power-Save feature, an external buffer would
be required to keep the address and data bus lines from toggling or floating to achieve the low current. But if
the Power-Save feature is enabled (PwrSave pin connected to VCC), this will eliminate the need for an
external buffer by internally isolating the address, data and control signals from other bus activities that could
cause wasteful power drain (see Figure 1). The L210 enters Power-Save mode when this pin is connected to
VCC, and the UART portion of the L210 is already in sleep mode.
Since Power-Save mode isolates the address, data and control signals, the device will wake-up only by:
■ a receive data start bit transition
■ a change of logic state on any of the modem or general purpose serial inputs: i.e., any of the MSR bits 0-
3 shows a ’1’
The L210 will return to the Power-Save mode automatically after a read to the MSR (to reset the modem
inputs) and all interrupting conditions have been serviced and cleared. The L210 will stay in the Power-Save
mode of operation until it is disabled by setting IER bit-4 to a logic 0 and/or the Power-Save pin is connected to
GND.
If the L210 is awakened by any one of the above conditions, it issues an interrupt as soon as the oscillator
circuit is up and running and the device is ready to transmit/receive. This interrupt has the same encoding (bit-
0 of ISR register = 1) as "no interrupt pending" and will clear when the ISR register is read. This will show up in
the ISR register only if no other interrupts are enabled.
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相关代理商/技术参数 |
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| XR19L210IL40-0B-EB | 功能描述:界面开发工具 Supports L210 40 pin QFN, PCI Interface RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR19L210IL40-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR19L212 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER |
| XR19L212IL48 | 制造商:EXAR 制造商全称:EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER |
| XR19L212IL48-0B-EB | 功能描述:界面开发工具 Supports L212 48 pin QFN, PCI Interface RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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