Datasheet

7.3 I
2
C Address Selection
EVM Feature Details www.ti.com
Three input pins on the TPS2359 are assigned for setting the device I
2
C address: A2, A1 and A0. These
pins are 3-level inputs, allowing the device to be assigned any one of 27 unique address values. These
pins can be tied to ground potential to generate a logic low (L), pulled up to the VINT pin to generate a
logic high (H), or left open to float to a mid-range, no-connect (NC) level. On the EVM, address selection
is performed using switch S3. However, S3 is a common 4-position, 2-throw DIP switch. The switch is
wired into the circuit to pull the corresponding input pin to ground (L) when its DIP position is closed.
When a DIP position is open (O), the corresponding pin floats. Therefore, the address space for the EVM
is limited to an 8-value subset of the addresses recognized by the TPS2359. Table 9 specifies the valid
address space of the TPS2359EVM. Note that switch position S3-4 is not used.
Table 9. TPS2359EVM Valid I
2
C Addresses
S3 POSITION DEVICE ADDRESS
A2 A1 A0 TERNARY DECIMAL
L L L 000
3
+ 22
3
0 + 8 = 8
L L O 001
3
+ 22
3
1 + 8 = 9
L O L 010
3
+ 22
3
3 + 8 = 11
L O O 011
3
+ 22
3
4 + 8 = 12
O L L 100
3
+ 22
3
9 + 8 = 17
O L O 101
3
+ 22
3
10 + 8 = 18
O O L 110
3
+ 22
3
12 + 8 = 20
O O O 111
3
+ 22
3
13 + 8 = 21
18 SLUU318 – August 2008
TPS2359 Dual-Slot ATCA™ AdvancedMC™ Controller with I
2
C Evaluation Module
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