NXP Semiconductors PCA9955A, Руководство пользователя, Страница: 8 / 25

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User manual Rev. 2 — 1 August 2017 8 of 24
NXP Semiconductors
UM10729
PCA9955A/B demonstration board OM13483
5. Hardware description
Figure 4 shows the following items on the hardware:
•
CON1 (9-pin male connector) is used to daisy-chain to next I
2
C-bus slave device or
demo board.
•
CON2 (9-pin female connector) is connected to JP1 on I2C demo board 2005-1 as
master device to drive this demo board.
•
CON3 (5-pin male connector) is connected to the PCU9669 or PCA9665 mini board
as I
2
C-bus master device to drive this demo board.
•
CON4 (14-pin male connector) is connected to J1 on Win-I2CUSB hardware board as
I
2
C-bus master device to drive this demo board.
•
J1 selects V
DD
power for PCA9955A/B, connected 1-2 for V
DD
= 5 V and connected
2-3 for V
DD
= 3.3 V.
•
J7, J9 and J10 to select one of the five (GND, Pull-down, Floating, Pull-up and V
DD
)
input levels to address inputs AD[0:2] for a maximum of 125 possible programmable
I
2
C-bus slave address.
•
LED[0:15] 16-channel output to drive four White LEDs (WHT_LED[1:4]) and four RGB
LEDs (RGB_LED[1:4]).
•
TP2 and TP3 are GND pins for probing use.
•
TP1 can be connected as external reset signal to RESET pin when J6 is open.
•
TP4 can be connected as external output enable signal to OE pin for blinking/dimming
control when J11 is open.
•
All jumpers default setting and function as shown in Table 1 .
Fig 4. PCA9955A/B demo board (OM13483)