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User manual Rev. 1 — 7 June 2012 6 of 16
NXP Semiconductors
UM10572
PCA9955 demonstration board OM13330
5. Hardware description
Figure 3 shows the following items on the hardware:
•
J4 (9-pin) is for connection to JP1 on I2C demo board 2005-1.
•
J3 and J5 (5-pin) are for connection to PCA9665/PCU9669 mini boards and cascade
the second PCA9955 demo board.
•
J1 selects V
DD
power for PCA9955, connected 1-2 for V
DD
= 3.3 V and connected 2-3
for V
DD
= 5 V.
•
SW1 4-position DIP switch to select I
2
C-bus address A[0:3] = SW1[1:4] for this device
(default is 0xC0, all switches are ON position).
•
J2 (14-pin) is for connection to J1 on Win-I2CUSB board.
•
4-channel to drive four White LEDs (D2, D4, D6, D9) and 12-channel to drive
four RGB LEDs (D3, D5, D7, D8).
•
J6, J7 and J8 are GND pins for probing use.
Fig 3. PCA9955 demo board (OM13330)