9
Rev. 0
SOLDER JUMPERS AND OTHER FUNCTIONS
REF
PCB PICTURE
DESCRIPTION
SJ1–SJ4
Normally closed solder jumpers to allow disconnection of onboard
shunt RSNS1. Those are small PCB footprints that can be cut with
a small knife. SJ1, SJ2 allow to disconnect I2P, I2M from the shunt.
SJ3, SJ4 allow to disconnect I1P, I1M from the shunt. Once a channel
is disconnected, it is possible to connect an external shunt to the test
points right below the solder jumpers.
After being cut, it is still possible to close them again by applying
some solder.
SJ5, SJ6
Normally closed solder jumpers to allow disconnection of onboard
4MHz crystal.
BYP2, IOV
CC
Test points to LTC2949’s IOV
CC
supply input and BYP2 3.3V supply
output. The BYP2 supply output can be used to load external circuits
with up to 10mA, for example to supply an external SPI isolator
like ADuM141E or ADuM4154. In such applications IOV
CC
can be
connected to BYP2 via those test points. See also Appendix A: Usage
of SPI Isolator Instead of isoSPI for more details.
HARDWARE DESCRIPTION
Figure 3. Solder Jumpers SJ1–SJ4, Allow Separation of the Two Current Channels
