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參數(shù)資料
| 型號： | XR16L651 |
| 廠商： | Exar Corporation |
| 英文描述： | 2.5V, 3.3V and 5V Low Power UART with 32-Byte FIFO(2.5V, 3.3V和5V 低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出）) |
| 中文描述： | 2.5V，3.3V與5V的低功耗的UART與32字節(jié)的FIFO（2.5伏，3.3伏和5V的低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出）） |
| 文件頁數(shù)： | 15/46頁 |
| 文件大小： | 516K |
| 代理商： | XR16L651 |
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á
XR16L651
2.5V, 3.3 AND 5V LOW POWER UART WITH 32-BYTE FIFO
PRELIMINARY
REV. P1.0.0
15
es the on-time of the infrared LED, hence reduces the
power consumption. See
Figure 10
below. The 651
has an additional feature to allow user to vary the
transmit pulse width further reducing power con-
sumption of the system where application permits
(see IRPW register for details).
The wireless infrared decoder receives the input
pulse from the infrared sensing diode on RX pin.
Each time it senses a light pulse, it returns a logic 0 to
the data bit stream. The 651 also includes another
feature - inversion of the IR pulse (XFR register bit-1),
where each “0” bit in the data stream is transmitted
(and received) as a LOW IR pulse.
5.5
The XR16L651 FIFO trigegr levels provide additional
flexibility to the user for block mode operation. The
user can optionally operate the transmit and receive
FIFO’s in the DMA mode (FCR bit-3). The DMA mode
affects the state of the -RXRDY and -TXRDY output
pins. The following tables show this:
DMA O
PERATION
5.6
The 651 UART provides an internal loopback capabil-
ity for system diagnostic purposes. The internal loop-
back mode
is enabled by setting MCR register bit-4 to
logic 1. All regular UART functions operate normally.
Figure 11 shows how the modem port signals are re-
configured. Transmit data from the transmit shift reg-
ister output is internally routed to the receive shift reg-
I
NTERNAL
L
OOPBACK
F
IGURE
10. I
NFRARED
T
RANSMIT
D
ATA
E
NCODING
AND
R
ECEIVE
D
ATA
D
ECODING
Character
Data Bits
S
S
0
0
0
0
0
1
1
1
1
1
Bit Time
1/16 Clock Delay
IRdecoder-1
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
S
S
0
0
0
0
0
1
1
1
1
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
T
ABLE
5: -RXRDY
PIN
N
ON
-DMA M
ODE
DMA M
ODE
1 = FIFO empty
0 to 1 transition when FIFO empties
0 = at least 1
byte in FIFO
1 to 0 transition when FIFO reaches
trigger level, or timeout occurs
T
ABLE
6: -TXRDY
PIN
N
ON
-DMA M
ODE
DMA M
ODE
1 = at least 1 byte in FIFO
1 = FIFO is full
0 = FIFO empty
0 = FIFO has at least 1
empty location
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR16L651CM | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V UART WITH 32-BYTE FIFO |
| XR16L651CM-0A-EVB | 功能描述:UART 接口集成電路 Supports L651 48 ld TQFP, ISA Interface 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 |
| XR16L651CM-F | 功能描述:UART 接口集成電路 UARTW/32BYTEFIFO 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 |
| XR16L651CMTR-F | 制造商:Exar Corporation 功能描述:UART 1-CH 32Byte FIFO 2.5V/3.3V/5V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR16L651CMTR-F |
| XR16L651IM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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