xr16v794iv Exar Corporation, xr16v794iv Datasheet - Page 16

• Manufacturer Part Number: xr16v794iv
• Description: High Performance 2.25v To 3.6v Quad Uart With Fractional
• Manufacturer: Exar Corporation

XR16V794
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
The infrared encoder sends out a 3/16 of a bit wide HIGH-pulse for each “0” bit in the transmit data stream.
This signal encoding reduces the on-time of the infrared LED, hence reduces the power consumption. See
Figure 10
The 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 zero to the data bit stream. The decoder also accepts (when FCTR bit-4 = 1) an
inverted IR-encoded input signal. This option supports active LOW instead of normal active HIGH pulse from
some infrared modules on the market.
below.
F
IGURE
10. I
Receive
IR Pulse
(RX pin)
RX Data
TX Data
Transmit
IR Pulse
(TX Pin)
NFRARED
T
0
RANSMIT
Bit Time
Bit Time
0
1
1/16 Clock Delay
1
D
0
ATA
0
1
E
Character
Data Bits
NCODING AND
1
0
16
3/16 Bit Time
Data Bits
Character
0
0
0
1
R
1 1
1
ECEIVE
0
0
D
1/2 Bit Time
ATA
1
1
IRdecoder-
D
IrEncoder-1
ECODING
REV. 1.0.0