XR16M581IB25-0C-EB (Exar) PDF资料下载 Datasheet(14/51 页)

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参数资料

XR16M581

REV. 1.0.1

1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE

an interrupt is pending from any channel. The M581 will stay in the sleep mode of operation until it is disabled

by setting IER bit-4 to a logic 0.

A word of caution: owing to the starting up delay of the crystal oscillator after waking up from sleep mode, the

first few receive characters may be lost. Also, make sure the RX pin is idling HIGH or “marking” condition

during sleep mode. This may not occur when the external interface transceivers (RS-232, RS-485 or another

type) are also put to sleep mode and cannot maintain the “marking” condition. To avoid this, the system design

engineer can use a 47k ohm pull-up resistor on each of the RX input.

2.17.2

Power-Save Feature

If the address lines, data bus lines, IOW#, IOR#, CS# and modem input lines remain steady when the M581 is

in sleep mode, the maximum current will be in the microamp range as specified in the DC Electrical

Characteristics on page 42. If the input lines are floating or are toggling while the M581 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 (see Figure 1 on page 1) from other bus activities that

could cause wasteful power drain. The M581 enters Power-Save mode when this pin is connected to VCC and

the M581 is in sleep mode (see Sleep Mode section above).

Since Power-Save mode isolates the address, data and control signals, the device will wake-up only by:

■ a receive data start bit transition (HIGH to LOW) at the RX input or

■ a change of logic state on the modem or general purpose serial input CTS#, DSR#, CD#, RI#

The M581 will return to the Power-Save mode automatically after a read to the MSR (to reset the modem input

CTS#) and all interrupting conditions have been serviced and cleared. The M581 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.

2.17.3

Wake-up Interrupt

The M581 has the wake up interrupt. By setting the FCR bit-3, wake up interrupt is enabled or disabled. The

default status of wake up interrupt is disabled. Please See ”Section 4.5, FIFO Control Register (FCR) -

相关代理商/技术参数	参数描述
XR16M581IB25-F	功能描述:UART 接口集成电路 1.62-3.63V; 16-Byte FIFO & VLIO; 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
XR16M581IL24	制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE
XR16M581IL24-0C-EB	功能描述:界面开发工具 Eval Board for XR16M581IL24 Series 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
XR16M581IL24-F	功能描述:UART 接口集成电路 1.62-3.63V; 16-Byte FIFO & VLIO; 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
XR16M581IL32	制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE

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