Total Phase
Aardvark I
2
C/SPI Activity Board
2.1. Configurable I
2
C Address
The I
2
C Port Expander and the I
2
C EEPROM have hardware configurable
I
2
C addresses. You'll notice on the board the following diagram:
Figure 3: Default I
2
C Port Expander address.
This diagram gives the address of the I
2
C Port Expander. The “x” indi-
cates a configurable value. If the connectors are bridged, the value is 1,
otherwise the value is 0.
In its default state, the I
2
C Port Expander has a address of
0111000 == 0x38 == 56.
When a jumper is added in to A1,
Figure 4: I
2
C Port Expander address has been configured using a jumper
(red) on position A1.
This effectively changes the target's address from
0x38 to 0x3a.
the address becomes
0111010 == 0x3a == 58
The jumpers for configuring the target addresses are not included with
the board.
www.totalphase.com
6
