Jumpers
©
PHYTEC Messtechnik GmbH 2010 L-750e_1
25
The jumpers (J = solder jumper) have the following functions:
Jumper
Description
Type
Chapter
J4, J1,
J3
J4, J1 and J3 define the slave addresses (A0 toA2) of
the serial memory U6 on the I
2
C2 bus. In the high-
nibble of the address, I
2
C memory devices have the
slave ID 0xA. The low-nibble is build from A2, A1, A0,
and the R/W bit. .
0R
(0402
)
all 2+3
A0 = 0, A1 = 1, A2= 0, => 0x4 / 0x5 (W/R)
are selected as the low-nibble of the
EEPROM's address
other
settings
please refer to
Table 11
to find alternative
addresses resulting from other combinations
of jumpers J1, J3, and J4
7.3.1
J16
J16 connects pin 7 of the serial memory at U6 to GND.
On many memory devices pin 7 enables/disables the
activation of a write protect function.
It is not guaranteed that the standard serial memory
populating the phyCARD-M will have this write
protection function.
Please refer to the corresponding memory data sheet
for more detailed information.
0R
(0402
)
open
EEPROM U6 is write protected
closed
EEPROM U6 is not write protected
7.3.2
J2
J2 selects, if the fuse voltage VDD_FUSE is available
only if the primary voltage VDD_3V3_IN is supplied,
or if it is also available when only VBAT is supplied.
0R
(0402)
1+2 Fuse voltage VDD_FUSE is not available
if VBAT is the only voltage source
2+3 Fuse voltage VDD_Fuse is also available
when VBAT is the only voltage source
J9
J9 selects, if the 2.775V voltage rail is available only if
the primary voltage VDD_3V3_IN is supplied, or if it is
also available when only VBAT is supplied.
0R
(0805
)
1+2 2.775V voltage rail is not available if
VBAT is the only voltage source
2+3 2.775V voltage rail is also available when
VBAT is the only voltage source
