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參數(shù)資料
| 型號： | XR19L220IL40-0B-EB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 8/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR XR19L202 40QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
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XR19L220
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 L220 is isolated from the CPU
interface. If the address lines, data bus lines, IOW#, IOR# and CS# remain steady when the L220 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 L220 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 L220 enters Power-Save mode when this pin is connected to
VCC, and the UART portion of the L220 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, or
■ 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 L220 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 L220 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 L220 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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| XR19L220IL40-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR19L222 | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER |
| XR19L222IL64 | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER |
| XR19L222IL64-0B-EB | 功能描述:界面開發(fā)工具 Supports L222 64 pin QFN, pci Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR19L222IL64-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
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