Exar XR21V1414 User manual

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REV. 1.0.0 XR21V1414 EVALUATION BOARD USER’S MANUAL
1.0 INTRODUCTION
This user’s manual is for the XR21V1414 evaluation board. It will describe the hardware setup required to
operate the part.
2.0 OVERVIEW
The XR21V1414 evaluation board has one 48-TQFP package on it. Figure 1 shows a top view of XR21V1414
evaluation board
FIGURE 1. TOP VIEW OF XR21V1414 EVALUATION BOARD LAYOUT
layout.
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XR21V1414 EVALUATION BOARD USER’S MANUAL REV. 1.0.0
Figure 2 shows a bottom view of XR21V1414 evaluation board layout.
FIGURE 2. BOTTOM VIEW OF XR21V1414 EVALUATION BOARD LAYOUT
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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.
TABLE 1: COMPONENTS OFTHE XR21V1414 EVALUATION BOARD
UNIT LOCATION PART FUNCTION
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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XR21V1414 EVALUATION BOARD USER’S MANUAL REV. 1.0.0
NOTES:1) An external pull-up is required on the LOWPOWER pin for proper functionality. The external pull-up is not shown
in the evaluation board schematics, but has been added on the evaluation board. 2) An external pull-up is required on any
GPIO pins that is used as an input. In the suspend mode, the internal pull-up resistor is disabled and the input will be
floating if there is no external pull-up resistor. The external pull-ups have not been added to the GPIOs used as inputs on
this evaluation board.
U24 Top SP3497EEN-L-NSOIC14 Exar’s RS-485 transceiver for channel D.
CON1 Top PJ-002A External power input.
CON2 Top 690-004-621-023 USB B-Type connector. Communication with USB host
(USBD+, USBD-) and power source for evaluation board
(VBus).
CON3 Top 182-009-113R161 RS-232 mode DB9 male connector for channel A.
CON4 Top 182-009-113R161 RS-232 mode DB9 male connector for channel B.
CON5 Top 182-009-113R161 RS-232 mode DB9 male connector for channel C.
CON6 Top 182-009-113R161 RS-232 mode DB9 male connector for channel D.
CON7 Top ED555/4DS RS-485 mode 4X1 terminal block for channel A.
CON8 Top ED555/4DS RS-485 mode 4X1 terminal block for channel B.
CON9 Top ED555/4DS RS-485 mode 4X1 terminal block for channel C.
CON10 Top ED555/4DS RS-485 mode 4X1 terminal block for channel D.
TABLE 1: COMPONENTS OFTHE XR21V1414 EVALUATION BOARD
UNIT LOCATION PART FUNCTION
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REV. 1.0.0 XR21V1414 EVALUATION BOARD USER’S MANUAL
2.2 Jumper Settings
2.2.1 Common jumpers
Common jumpers are those jumpers which should be set the same for both RS-232 and RS-485 mode. The
Table 2 shows the common jumpers setting on the evaluation board:
TABLE 2: COMMON JUMPERS SETTINGS
JUMPERS LOCATION FUNCTIONS COMMENTS
JP1 Top Power source select Not installed. Trace between pin 2&3.
■Jumper in 1&2 selects power from external power
supply of 5V
■Jumper in 2&3 selects power from USB VBUS
power
JP2 Top SCL pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SCL
Jumper in 2&3 selects pull-down for SCL
JP3 Top SDA pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SDA
Jumper in 2&3 selects pull-down for SDA
JP4 Top I2C EEPROM header Jumper in 1&2 connects SCL to I2C EEPROM
Jumper in 3&4 connects SDA to I2C EEPROM
NOTE: I2C EEPROM has not been programmed
JP5 Top Selects RS-232 or RS-485 mode for
Channel A
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP6 Top Selects RS-232 or RS-485 mode for
Channel B
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP7 Top Selects RS-232 or RS-485 mode for
Channel C
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP8 Top Selects RS-232 or RS-485 mode for
Channel D
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP25 Top Power supply for XR21V1414 Not installed. Trace between pin 1&2
JP26 Top UART side Channel A external loop-
back header
Jumper in enables external loopback for channel A in the
UART side
NOTE: External loopback via this jumper can only be
performed when the transceiver has been
disabled.
JP27 Top UART side Channel B external loop-
back header
Jumper in enables external loopback for channel B in the
UART side
NOTE: External loopback via this jumper can only be
performed when the transceiver has been
disabled.
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XR21V1414 EVALUATION BOARD USER’S MANUAL REV. 1.0.0
2.2.2 Remote wakeup and jumper
The SDA and SCL are used to specify whether Remote Wakeup and/or Bus Powered configurations are to be
supported. These pins are sampled at power-up. The following Table 3 describes how Remote Wakeup and
Bus Powered support.
TABLE 3: REMOTE WAKEUP AND POWER MODES
REMOTE WAKE-UP
SUPPORT POWER MODE COMMENTS
1 1 No Self-Powered Default, if no EEPROM is present
1 0 No Bus-Powered
0 1 Yes Self-Powered
0 0 Yes Bus-Powered
The following Table 4 shows jumpers related to remote wakeup.
TABLE 4: REMOTE WAKEUP JUMPERS SETTINGS
JUMPERS LOCATION FUNCTIONS COMMENTS
JP38 To p Select remote control wakeup signal for
Channel A
Jumper in 1&2 selects UART RS-232 transceiver (RI#)
signal
Jumper in 2&3 selects push-button
SW1 To p Generate remote wakeup signal Push once to generate one remote wakeup signal
JP28 Top UART side Channel C external loop-
back header
Jumper in enables external loopback for channel C in the
UART side
NOTE: External loopback via this jumper can only be
performed when the transceiver has been
disabled.
JP29 Top UART side Channel D external loop-
back header
Jumper in enables external loopback for channel D in the
UART side
NOTE: External loopback via this jumper can only be
performed when the transceiver has been
disabled.
SDA SCL
TABLE 2: COMMON JUMPERS SETTINGS
JUMPERS LOCATION FUNCTIONS COMMENTS
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REV. 1.0.0 XR21V1414 EVALUATION BOARD USER’S MANUAL
2.2.3 RS-232 mode jumpers (Default setting is RS-232 mode)
The XR21V1414 evaluation board is set in RS-232 mode by default. The following Table 5 jumper settings
apply to the RS-232 mode:
TABLE 5: JUMPER SETTINGS FOR RS-232 MODE
JUMPERS LOCATION FUNCTIONS COMMENTS
JP30 Top Power supply for RS-232 transceiver of
Channel A
Not installed. Trace between pin 1&2
JP31 Top Power supply for RS-232 transceiver of
Channel B
Not installed. Trace between pin 1&2
JP32 Top Power supply for RS-232 transceiver of
Channel C
Not installed. Trace between pin 1&2
JP33 Top Power supply for RS-232 transceiver of
Channel D
Not installed. Trace between pin 1&2
2.2.4 RS-485 mode jumpers
The following Table 6 jumper setting applies to the RS-485 mode:
TABLE 6: JUMPER SETTINGS FOR RS-485 MODE
JUMPERS LOCATION FUNCTIONS COMMENTS
JP34 Top Power supply for RS-485 transceiver of
Channel A
Not installed. Trace between pin 1&2
JP9 Top Select Channel A RTS or DTR direction
control for TX
Jumper in 1&2 selects RTS based direction control for
TX
Jumper in 2&3 selects DTR based direction control for
TX
JP10 Top Select Channel A direction control for RX
and TX or always for RX
Jumper in 1&2 selects common direction control for
RX and TX
Jumper in 2&3 enables RX always
JP11 Top Channel select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP12 Top Channel select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP35 Top Power supply for RS-485 transceiver of
Channel B
Not installed. Trace between pin 1&2
JP13 Top Select Channel B RTS or DTR direction
control for TX
Jumper in 1&2 selects RTS based direction control for
TX
Jumper in 2&3 selects DTR based direction control for
TX
JP14 Top Select Channel B direction control for RX
and TX or always for RX
Jumper in 1&2 selects common direction control for
RX and TX
Jumper in 2&3 selects common direction control for
RX always
JP15 Top Channel B select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
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XR21V1414 EVALUATION BOARD USER’S MANUAL REV. 1.0.0
3.0 DRIVERS AND SUPPORT
For any questions about this evaluation board, software drivers or technical support, send an e-mail to
[e-mail].
JP16 Top Channel B select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP36 Top Power supply for RS-485 transceiver of
Channel C
Not installed. Trace between pin 1&2
JP17 Top Select Channel C RTS or DTR direction
control for TX
Jumper in 1&2 selects RTS based direction control for
TX
Jumper in 2&3 selects DTR based direction control for
TX
JP18 Top Select Channel C direction control for RX
and TX or always for RX
Jumper in 1&2 selects common direction control for
RX and TX
Jumper in 2&3 selects common direction control for
RX always
JP19 Top Channel C select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP20 Top Channel C select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP37 Top Power supply for RS-485 transceiver of
Channel D
Not installed. Trace between pin 1&2
JP21 Top Select Channel D RTS or DTR direction
control for TX
Jumper in 1&2 selects RTS based direction control for
TX
Jumper in 2&3 selects DTR based direction control for
TX
JP22 Top Select Channel D direction control for RX
and TX or always for RX
Jumper in 1&2 selects common direction control for
RX and TX
Jumper in 2&3 selects common direction control for
RX always
JP23 Top Channel D select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
JP24 Top Channel D select for half duplex or full
duplex mode
Jumper in 1&2 selects for half duplex mode
Jumper in 2&3 selects for full duplex mode
TABLE 6: JUMPER SETTINGS FOR RS-485 MODE
JUMPERS LOCATION FUNCTIONS COMMENTS
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NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2009 EXAR Corporation
Datasheet July 2009.
Send your UART technical inquiry with technical details to hotline: [e-mail].
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
REV. 1.0.0 XR21V1414 EVALUATION BOARD USER’S MANUAL
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