UM10709
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© NXP B.V. 2017. All rights reserved.
User manual
Rev. 2 — 11 August 2017
6 of 18
NXP Semiconductors
UM10709
PCA9956B demonstration board OM13321
5. Hardware
description
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 PCA9956B, connected 1-2 for V
DD
= 5 V and connected 2-3
for V
DD
= 3.3 V.
•
J5, J8 and J9 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[0:23] 24-channel output to drive eight RGB LEDs (RGB_LED[1:8]).
•
TP2 and TP3 are GND pins for probing use.
Fig 3.
PCA9956B demo board (OM13321)
CON1 9-pin
connector to
2
nd
PCx9956A
demo board
CON2 9-pin
connector to
I2C 2005-1
board
RGB
LED[0:2]
RGB
LED[3:5]
RGB
LED[6:8]
RGB
LED[9:11]
RGB
LED[12:14]
RGB
LED[15:17]
RGB
LED[18:20]
RGB
LED[21:23]
Quinary input pads
select for AD[2:0]
J5: AD0; J8: AD1; J9: AD2
J1 select V
DD
1-2 (+5V)
2-3 (+3.3V)
CON3 5-pin
connector to
Mini board
PCU9669
J28 select LED power
ON: in3.3V
OFF: external up to +20V
J11 external
Input power
up to +20V for LEDs
PCA9956B
6 white LEDs
for LED0 (ch0)
test up to 20V
All 6 jumpers
ON: LED0 is for +3.3V
OFF: LED0 is for +20V
TP4 /OE
Input point
TP1 RESET
Input point
J2 select Rext
1-2: 1K
3-4: 1.5K
5-6: 2 K
CON4 14-pin
connector to
Win-I2CUSB
board
B
