6
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.
T
ABLE
3: R
EMOTE
W
AKEUP
AND
P
OWER
M
ODES
R
EMOTE
W
AKE
-
UP
S
UPPORT
P
OWER
M
ODE
C
OMMENTS
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.
T
ABLE
4: R
EMOTE
W
AKEUP
J
UMPERS
S
ETTINGS
J
UMPERS
L
OCATION
F
UNCTIONS
C
OMMENTS
JP38
Top
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
Top
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
N
OTE
:
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
N
OTE
:
External loopback via this jumper can only be
performed when the transceiver has been
disabled.
SDA
SCL
T
ABLE
2: C
OMMON
J
UMPERS
S
ETTINGS
J
UMPERS
L
OCATION
F
UNCTIONS
C
OMMENTS
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