XR17V352IB-0A-EVB Exar Corporation, XR17V352IB-0A-EVB Datasheet - Page 36

• Manufacturer Part Number: XR17V352IB-0A-EVB
• Description: EVAL BOARD FOR XR17V352 113BGA
• Manufacturer: Exar Corporation

Specifications of XR17V352IB-0A-EVB

• Main Purpose: Interface, UART
• Embedded: -
• Utilized Ic / Part: XR17V352
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

XR17V352
HIGH PERFORMANCE DUAL PCI EXPRESS UART
Each UART in the V352 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.1. The input pin ENIR conveniently activates both UART channels to start up in the
infrared mode. This global control pin enables the MCR bit [6] function in every UART channel register. After
power up or a reset, the software can overwrite MCR bit [6] if so desired. ENIR and MCR bit [6] also disable its
receiver while the transmitter is sending data. This prevents the echoed data from going to the receiver. The
global activation ENIR pin prevents the infrared emitter from turning on and drawing large amount of current
while the system is starting up. When the infrared feature is enabled, the transmit data outputs, TX[1:0], would
idle LOW. Likewise, the RX [1:0] inputs assume a LOW idle level.
The infrared encoder sends out a 3/16 of a bit wide 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 11
For data rates above 115.2 kbps and up to1.152 Mbps, Fast IR mode can be enabled via DLD bit-4 for a 1/4 of
bit wide pulse. For exact 3/16 or 1/4 of a bit wide pulse, the 16X sampling rate should be used and DLD[3:0] =
’0000’. The IR pulse width can vary if DLD[3:0] is not ’0000’.
The infrared decoder receives the input pulse from the infrared sensing diode on RX pin. Each time the
decoder senses a light pulse, it returns a "0" to the data bit stream. The RX input signal may be inverted prior
delivered to the input of the decoder via internal register setting. This option supports active LOW instead of
normal active HIGH pulse from some infrared modules on the market.
3.3
Infrared Mode
below. Typical max data rate for the infrared encoder with a 3/16 of a bit wide pulse is 115.2 kbps.
F
IGURE
Receive
IR Pulse
(RX pin)
RX Data
TX Data
Transmit
IR Pulse
(TX Pin)
11. I
NFRARED
0
Bit Time
Bit Time
1
0
1/16 Clock Delay
T
RANSMIT
0
1
0
1
Character
Data Bits
D
1
0
ATA
36
Data Bits
Character
3/16 or 1/4
Bit Time
0
0
E
NCODING AND
0
1
1 1
1
0
R
0
ECEIVE
1
1/2 Bit Time
1
IRdecoder-
IrEncoder-1
D
ATA
D
ECODING
REV. 1.0.1