NXP Semiconductors PCA9633, User Manual, Page: 6 / 16

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User manual Rev. 1 — 17 October 2012 6 of 16
NXP Semiconductors
UM10573
PCA9633 demo board OM6276
2.2 Board power and mode DIP switch (SW1)
This DIP switch comprises 8 slider switches that connect board power, set slaved boards
and set cable functions.
2.3 DIP switch settings
[1] See Section 2.4 .
2.3.1 Board power OFF/ON
Slider switch 8 of the DIP switch turns power OFF/ON for the board. Switch the board
power OFF whenever the board is not in use to avoid battery drain. Remove the battery
from the board when not in use, to avoid battery drain should the OFF/ON switch be
inadvertently switched ON. Place the battery in the holder with the contacts “away” from
each other as a storage method (
Figure 2 ).
Fig 4. Board power and mode DIP switch
DDD
Table 1. DIP switch settings
Slider
switch Function Switch
position Description
1 board address 0 1<>0
[1]
board address input to

processor and PCA9633
2 board address 1 1<>0
[1]
board address input to

processor and PCA9633
3 board address 2 1<>0
[1]
board address input to

processor and PCA9633
4 cable LED OE N<>Y connect the OE of the PCA9633 to the cable
5 bus SDA pull-up enable N<>Y enable pull-up of the SDA signal on the cable
6 bus SCL pull-up enable N<>Y enable pull-up of the SCL signal on the cable
7 cable power OFF/ON OFF/ON connect the battery to the cable
8 board power OFF/ON OFF/ON board power control