REV. 1.0.0
XR21V1410 EVALUATION BOARD USER’S MANUAL
1.0 INTRODUCTION
This user’s manual is for the XR21V1410 evaluation board. It will describe the hardware setup required to
operate the part.
2.0 OVERVIEW
The XR21V1410 evaluation board has one 16-QFN package on it.
Figure 1
shows a top view of XR21V1410
evaluation board layout.
F
IGURE
1. T
OP
V
IEW OF
XR21V1410 E
VALUATION
B
OARD
L
AYOUT
1
XR21V1410 EVALUATION BOARD USER’S MANUAL
Figure 2
shows a bottom view of XR21V1410 evaluation board layout.
F
IGURE
2. B
OTTOM
V
IEW OF
XR21V1410 E
VALUATION
B
OARD
L
AYOUT
REV. 1.0.0
2.1
Evaluation Board Components
On the XR21V1410 evaluation board, some componets are required to install. Some are optional and some
are not installed.
Table 1
shows the components:
T
ABLE
1: C
OMPONENTS
O
F
T
HE
XR21V1410 E
VALUATION
B
OARD
U
NIT
U1
U2
U3
U4
U5
U6
U7
U8
U9
CON1
L
OCATION
Top
Bottom
Top
Bottom
Top
Top
Bottom
Top
Top
P
ART
F
UNCTION
SP6669AEK-L/TRR3 Exar’s Voltage converter to step down voltage from 5V to 3.3V.
SN74LVC2G53DCTR Multiplexer to switch between RS-232 and RS-485 mode.
XR21V1410IL16-F
NC7SZ14M5X
AT24C02B
SP3245EEY-L
SN74LVC2G66DCT
SP3497EEN-L
PJ-002A
Exar’s USB 1 channel UART.
Invert LowPower (suspend) signal.
I2C EEPROM.
Exar’s RS-232 transceiver.
Analog switch.
Exar’s RS-485 transceiver.
External power input.
2
REV. 1.0.0
XR21V1410 EVALUATION BOARD USER’S MANUAL
T
ABLE
1: C
OMPONENTS
O
F
T
HE
XR21V1410 E
VALUATION
B
OARD
U
NIT
CON2
CON3
CON4
L
OCATION
Top
Top
Top
P
ART
690-004-621-023
182-009-113R161
ED555/4DS
F
UNCTION
USB B-Type connector. Communication with USB host (USBD+,
USBD-) and power source for evaluation board (V
Bus
).
RS-232 mode DB9 male connector.
RS-485 mode 4X1 terminal block.
N
OTES
: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.
2.2
2.2.1
Jumper Settings
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:
T
ABLE
2: C
OMMON
J
UMPERS
S
ETTINGS
J
UMPERS
JP1
L
OCATION
Top
Power select
F
UNCTIONS
C
OMMENTS
Jumper in 1&2 selects power from external power sup-
ply of 5V
Jumper in 2&3 selects power from USB V
BUS
power
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
Jumper in 1&2 selects external loopback
Jumper in 1&2 selects pull-up resistor
Jumper in 2&3 selects pull-down resistor
Jumper in 1&2 selects pull-up resistor
Jumper in 2&3 selects pull-down resistor
Not installed. Trace between pin 1 & 2
Jumper in 1&2 connects SCL to I2C EEPROM
Jumper in 3&4 connects SDA to I2C EEROM
N
OTE
:
I2C EEPROM has not been programmed
JP2
JP3
JP4
JP5
JP6
JP7
Top
Top
Top
Top
Top
Top
Selects RS-232 or RS-485 mode
External loopback or test header
SCL pull-up/pull-down select
SDA pull-up/pull-down select
Power supply for XR21V1410
I2C EEPROM header
3
XR21V1410 EVALUATION BOARD USER’S MANUAL
2.2.2
Remote wakeup and jumper
REV. 1.0.0
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.
T
ABLE
3: R
EMOTE
W
AKEUP AND
P
OWER
M
ODES
SDA
1
1
0
0
SCL
1
0
1
0
R
EMOTE
W
AKE
-
UP
S
UPPORT
No
No
Yes
Yes
P
OWER
M
ODE
Self-Powered
Bus-Powered
Self-Powered
Bus-Powered
C
OMMENTS
Default, if no EEPROM is present
The following
Table 4
shows jumpers related to remote wakeup.
T
ABLE
4: R
EMOTE
W
AKEUP
J
UMPERS
S
ETTINGS
J
UMPERS
JP8
SW1
L
OCATION
Top
Top
F
UNCTIONS
Select remote control wakeup signal
Generate remote wakeup signal
C
OMMENTS
Jumper in 1&2 selects RS-232 (RI#) signal
Jumper in 2&3 selects push-button
Push once to generate one remote wakeup signal
2.2.3
RS-232 mode jumpers (Default setting is RS-232)
The XR21V1410 evaluation board is set as RS-232 mode by default. The following
Table 5
shows the jumper
settings apply to the RS-232 mode:
T
ABLE
5: J
UMPER
S
ETTINGS
F
OR
RS-232 M
ODE
J
UMPERS
JP9
L
OCATION
Top
Selects power
F
UNCTIONS
C
OMMENTS
Not installed. Trace between pin 1&2
4
REV. 1.0.0
XR21V1410 EVALUATION BOARD USER’S MANUAL
RS-485 mode jumpers
2.2.4
The following
Table 6
jumper setting applies to the RS-485 mode:
T
ABLE
6: J
UMPER
S
ETTINGS
F
OR
RS-485 M
ODE
J
UMPERS
JP10
L
OCATION
Top
F
UNCTIONS
Select RTS or DTR direction control for
TX
C
OMMENTS
Jumper in 1&2 selects RTS based direction control for
TX
Jumper in 2&3 selects DTR based direction control for
TX
Jumper in 1&2 selects common direction control for
RX and TX
Jumper in 2&3 enables RX always
Not installed. Trace between pin 1 & 2.
Jumper in 1&2 selects half duplex mode
Jumper in 2&3 selects full duplex mode
JP11
Top
Select direction control for RX and TX or
always for RX
Selects power for RS-485 transceiver
Selects half duplex or full duplex mode.
JP12
JP13
JP14
Top
Top
3.0 DRIVERS AND SUPPORT
For any questions about this evaluation board, software drivers or technical support, send an e-mail to
uarttechsupport@exar.com.
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:
uarttechsupport@exar.com.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
5
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