XR16V2551 Datasheet, PDF (20/51 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE

XR16V2551
PRELIMINARY
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. P1.0.0
2.18 Infrared Mode
The V2551 UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The IrDA 1.0 standard that stipulates 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 11 below.
The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. When the infrared feature
is enabled, the transmit data output, TX, idles at logic zero level. Likewise, the RX input assumes an idle level
of logic zero from a reset and power up, see Figure 11.
Typically, the wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin.
Each time it senses a light pulse, it returns a HIGH to the data bit stream. However, this is not true with some
infrared modules on the market which indicate a LOW by a light pulse. So the V2551 has a provision to invert
the input polarity to accommodate this. In this case user can enable MCR bit-2 to invert the input signal.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
TX Data 0 ¹ 0 ¹ 0 0 ^{1 1} 0 ¹
Transmit
IR Pulse
(TX Pin)
Bit Time
3/16 Bit Time
1/2 Bit Time
IrEncoder-1
Receive
IR Pulse
(RX pin)
RX Data
Bit Time
1/16 Clock Delay
0 1 0 1 0 0 11 0 1
Data Bits
Character
IRdecoder-1
2.19 Sleep Mode with Wake-Up Indicator and PowerSave Feature
The V2551 supports low voltage system designs, hence, a sleep mode with auto wake-up and PowerSave
feature is included to reduce power consumption when the device is not actively used.
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