phyCARD-M [PCA-A-M1-xxx]
40
©
PHYTEC Messtechnik GmbH 2010 L-750e_1
Three solder jumpers are provided to set the lower address bits: J3, J4
and J5. Refer to
section 7.3.1
for details on setting these jumpers.
Write protection to the device is accomplished via jumper J2. Refer to
section 7.3.2
for further details on setting this jumper
.
7.3.1
Setting the EEPROM Lower Address Bits (J1, J3,
J4)
The 4KB I²C EEPROM populating U6 on the phyCARD-M module
has the capability of configuring the lower address bits A0, A1, and
A2. The four upper address bits of the device are fixed at ‘1010’ (
see
ST 24W32C data sheet).
The remaining three lower address bits of the
seven bit I²C device address are configurable using jumpers J1, J3 and
J4. J4 sets address bit A0, J1 address bit A1, and J3 address bit A2.
Table 11
below shows the resulting seven bit I²C device address for
the eight possible jumper configurations.
U6 I²C Device Address
J4
J1
J3
1010 010
2 + 3
2 + 3
2 + 3
1010 011
2 + 3
2 + 3
1 + 2
1010 000
2 + 3
1 + 2
2 + 3
1010 001
2 + 3
1 + 2
1 + 2
1010 110
1 + 2
2 + 3
2 + 3
1010 111
1 + 2
2 + 3
1 + 2
1010 100
1 + 2
1 + 2
2 + 3
1010 101
1 + 2
1 + 2
1 + 2
Table 11:
U6 EEPROM I²C address via J1, J3, and J4
1
1
:
Defaults are in
bold blue
text
