XR16L788IQ-F Exar Corporation, XR16L788IQ-F Datasheet - Page 17

• Manufacturer Part Number: XR16L788IQ-F
• Description: IC UART 64B 3.3V OCTAL 100QFP
• Manufacturer: Exar Corporation
• Type: IrDA or RS- 485r

Specifications of XR16L788IQ-F

• Number Of Channels: 8
• Package / Case: 100-BQFP
• Features: *
• Fifo's: 64 Byte
• Protocol: RS485
• Voltage - Supply: 2.97 V ~ 5.5 V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Data Rate: 6.25 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.97 V
• Supply Current: 5 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3.3 V or 5 V
• No. Of Channels: 8
• Uart Features: Tx/Rx FIFO Counters
• Supply Voltage Range: 2.97V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1284

REV. 1.2.3
disturbance that causes signal degradation. When the host is ready to transmit next polling data packet again,
it only has to load data bytes to the transmit FIFO. The transmitter automatically de-asserts RTS# or DTR#
output (HIGH) prior to sending the data. The auto RS485 half-duplex direction control also changes the
transmitter empty interrupt to TSR empty instead of THR empty.
Each UART in the 788 includes the infrared encoder and decoder compatible to the IrDA (Infrared Data
Association) version 1.0. The input pin ENIR conveniently activates all 8 UART channels to start up in the
infrared mode. Note that the ENIR pin is sampled when the RST# input is de-asserted. 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 the receiver while the transmitter is
sending data. This prevents echoed data from reaching 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[7:0], would idle at logic zero level. Likewise, the
RX [7:0] inputs assume an idle level of logic zero.
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
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.
2.14
Infrared Mode
below.
F
IGURE
11. 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
NCODING AND
Data Bits
1
0
17
3/16 Bit Time
Data Bits
HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART
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
XR16L788