Exar XR21V1414, User Manual

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3
REV. 1.0.0
XR21V1414 EVALUATION BOARD USER’S MANUAL
2.1 Evaluation Board Components
Table 1 below lists some of the components installed on the evaluation boards. The default setting is RS-232
mode.
T
ABLE
1: C
OMPONENTS
O
F
T
HE
XR21V1414 E
VALUATION
B
OARD
U
NIT
L
OCATION
P
ART
F
UNCTION
U1 Top XRP6657IHBTR-F-DFN6 Exar’s voltage converter to step down voltage from 5V to
3.3V.
U2 Top AT24C02B-PU-DIP8 I2C EEPROM.
U3 Top XR21V1414IM48 Exar’s 4 channel USB UART.
U4 Bottom NC7SZ14M5X-SOT-23-5 Invert LowPower (suspend) signal.
U5 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXA signal into either RS-232 or RS-485
transceiver.
U6 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXB signal into either RS-232 or RS-485
transceiver.
U7 Bottom SN74LVC2G53DCTR-SM8 Switch RXA signal from either RS-232 or RS-485 trans-
ceiver.
U8 Bottom SN74LVC2G53DCTR-SM8 Switch RXB signal from either RS-232 or RS-485 trans-
ceiver.
U9 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXC signal into either RS-232 or RS-485
transceiver.
U10 Bottom SN74LVC2G53DCTR-SM8 Switch UART TXD signal into either RS-232 or RS-485
transceiver.
U11 Bottom SN74LVC2G53DCTR-SM8 Switch RXC signal from either RS-232 or RS-485 trans-
ceiver.
U12 Bottom SN74LVC2G53DCTR-SM8 Switch RXD signal from either RS-232 or RS-485 trans-
ceiver.
U13 Top SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel A.
U14 Top SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel B.
U15 Top SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel C.
U16 Top SP3245EEY-L-TSSOP-28 Exar’s RS-232 transceiver for channel D.
U17 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal
(RTSA# or DTRA#).
U18 Top SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel A.
U19 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal
(RTSB# or DTRB#).
U20 Top SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel B.
U21 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal
(RTSC# or DTRC#).
U22 Top SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel C.
U23 Bottom SN74LVC2G66DCT-SM8 Mutiplexer to select RS-485 direction control signal
(RTSD# or DTRD#).
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