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參數(shù)資料
| 型號： | XR20M1170IG24-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 14/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO I2C/SPI 64B 24TSSOP |
| 標準包裝： | 62 |
| 特點： | * |
| 通道數(shù)： | 1，UART |
| FIFO's： | 64 字節(jié) |
| 規(guī)程： | RS485 |
| 電源電壓： | 2.25 V ~ 3.6 V |
| 帶自動流量控制功能： | 是 |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動位檢測功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 24-TSSOP |
| 包裝： | 管件 |
| 其它名稱： | 1016-1571-5 XR20M1170IG24-F-ND |
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XR20M1170
21
REV. 1.1.0
I2C/SPI UART WITH 64-BYTE FIFO
2.16
Sleep Mode with Auto Wake-Up
The M1170 supports low voltage system designs, hence, a sleep mode is included to reduce its power
consumption when the chip is not actively used.
All of these conditions must be satisfied for the M1170 to enter sleep mode:
■ no interrupts pending for the M1170 (ISR bit-0 = 1)
■ sleep mode of both channels are enabled (IER bit-4 = 1)
■ modem inputs are not toggling (MSR bits 0-3 = 0)
■ RX input pin is idling HIGH
The M1170 stops its crystal oscillator to conserve power in the sleep mode. User can check the XTAL2 pin for
no clock output as an indication that the device has entered the sleep mode.
The M1170 resumes normal operation by any of the following:
■ a receive data start bit transition (HIGH to LOW)
■ a data byte is loaded to the transmitter, THR or FIFO
■ a change of logic state on any of the modem or general purpose serial inputs: CTS#, DSR#, CD#, RI#
If the M1170 is awakened by any one of the above conditions, it will return to the sleep mode automatically
after all interrupting conditions have been serviced and cleared. If the M1170 is awakened by the modem
inputs, a read to the MSR is required to reset the modem inputs. In any case, the sleep mode will not be
entered while an interrupt is pending. The M1170 will stay in the sleep mode of operation until it is disabled by
setting IER bit-4 to a logic 0.
If the serial clock, serial data, and modem input lines remain steady when the M1170 is in sleep mode, the
maximum current will be in the microamp range as specified in the DC Electrical Characteristics on page 41.
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. The number of characters lost during the restart also depends on your
operating data rate. More characters are lost when operating at higher data rate. Also, it is important to keep
RX input idling HIGH or “marking” condition during sleep mode to avoid receiving a “break” condition upon the
restart. This may 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 designer can use a 47k-100k
ohm pull-up resistor on the RX input pin.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XR20M1170IG24TR-F | 制造商:Exar Corporation 功能描述:UART 1-CH 64Byte FIFO 1.8V/2.5V/3.3V 24-Pin TSSOP T/R 制造商:Exar Corporation 功能描述:XR20M1170IG24TR-F |
| XR20M1170IL16 | 制造商:EXAR 制造商全稱:EXAR 功能描述:I2C/SPI UART WITH 64-BYTE FIFO |
| XR20M1170IL16-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 |
| XR20M1170IL16TR-F | 功能描述:UART 接口集成電路 1.8V, 1 Ch. 64 Byte I2C / SPI 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 |
| XR20M1170IL24 | 制造商:EXAR 制造商全稱:EXAR 功能描述:I2C/SPI UART WITH 64-BYTE FIFO |
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