參數(shù)資料
型號(hào)： MAX3140CEI+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/36頁(yè)
文件大?。?/td> 0K
描述： IC UART SPI MICRWR W/TXRX 28QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 50
特點(diǎn)： 收發(fā)器
FIFO's： 8 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 4.75 V ~ 5.25 V
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶CMOS： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-QSOP
供應(yīng)商設(shè)備封裝： 28-QSOP
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1404 (CN2011-ZH PDF)
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
______________________________________________________________________________________
17
Table 1. Bit Descriptions
0
PE
POR
STATE
write
Parity-Enable Bit. Appends the Pt bit to the transmitted data when PE = 1, and sends the Pt
bit as written. No parity bit is transmitted when PE = 0. With PE = 1, an extra bit is expected to
be received. This data is put into the Pr register. Pr = 0 when PE = 0. The MAX3140 does not
calculate parity.
0
PE
read
Reads the value of the Parity-Enable bit.
0
PM
write
Mask for Pr bit. IRQ is asserted if PM = 1 and Pr = 1 (Table 7).
DESCRIPTION
0000
X
Pr
read
Receive-Parity Bit. This bit is the extra bit received if PE = 1. Therefore, PE = 1 results in 9-bit
transmissions (L = 0). If PE = 0, then Pr is set to 0. Pr is stored in the FIFO with the receive
data (see the
9-Bit Networks section).
0
IR
read
Reads the value of the IR bit.
L
BIT
TYPE
write
B0–B3
write
Baud-Rate Divisor Select Bits. Sets the baud clock’s value (Table 6).
B0–B3
read
Baud-Rate Divisor Select Bits. Reads the 4-bit baud clock value assigned to these registers.
BIT
NAME
Bit to set the word length of the transmitted or received data. L = 0 results in 8-bit words
(9-bit words if PE = 1) (see Figure 5). L = 1 results in 7-bit words (8-bit words if PE = 1).
0
X
L
read
Reads the value of the L bit.
Pt
write
Transmit-Parity Bit. This bit is treated as an extra bit that is transmitted if PE = 1. In 9-bit net-
works, the MAX3140 does not calculate parity. If PE = 0, then this bit (Pt) is ignored in transmit
mode (see the
9-Bit Networks section).
00000000
0
D0r–D7r
read
Eight data bits read from the receive FIFO or the receive-buffer register. When L = 1, D7r is
always 0.
FEN
write
FIFO Enable. Enables the receive FIFO when FEN = 0. When FEN = 1, FIFO is disabled.
0
FEN
read
FIFO-Enable Readback. FEN’s state is read.
IR
write
Enables the IrDA timing mode when IR = 1.
No
change
XXXXXXXX
CTS
read
Clear-to-Send-Input. Records the state of the CTS pin (CTS bit = 0 implies CTS pin = logic
high).
D0t–D7t
write
Transmit-Buffer Register. Eight data bits written into the transmit-buffer register. D7t is ignored
when L = 1.
0
PM
read
Reads the value of the PM bit (Table 7).
0
R
read
Receive Bit or FIFO Not Empty Flag. R = 1 means new data is available to be read or is being
read from the receive register or FIFO. If performing a READ DATA or WRITE DATA operation,
the R bit will clear on the falling edge of SCLK's 16th pulse if no new data is available.
0
RM
write
Mask for R bit. IRQ is asserted if RM = 1 and R = 1 (Table 7).
0
RM
read
Reads the value of the RM bit (Table 7).
0
RAM
write
Mask for RA/FE bit. IRQ is asserted if RAM = 1 and RA/FE = 1 (Table 7).
0
RAM
read
Reads the value of the RAM bit (Table 7).
0
RTS
write
Request-to-Send Bit. Controls the state of the RTS output. This bit is reset on power-up (RTS
bit = 0 sets the RTS pin = logic high).
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MAX3140CEI+ 功能描述:UART 接口集成電路 SPI/uWire Compatible 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
MAX3140CEI+T 功能描述:UART 接口集成電路 SPI/uWire Compatible 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
MAX3140CEI-T 功能描述:UART 接口集成電路 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
MAX3140EEI 功能描述:UART 接口集成電路 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
MAX3140EEI+ 功能描述:UART 接口集成電路 SPI/uWire Compatible 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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