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UM10
729
Al
l i
n
for
m
at
ion
pr
ovi
ded
in
this
do
cum
ent i
s
sub
jec
t to
leg
a
l d
is
c
la
im
er
s.
© N
XP
Sem
ic
ondu
ctor
s
B.V
. 2017.
Al
l r
ig
h
ts
r
e
s
er
v
ed.
User m
a
nu
al
Rev
. 2 — 1 A
ugu
st 2
017
1
1
o
f 24
N
X
P Semi
conductor
s
UM10729
PCA9
955
A/B
demon
s
tr
at
ion
b
o
ard
OM13
483
6. Schematic
Fig 5.
PCA9955A/B demo board schematic (part A)
aaa-013943
PCA9955A/PCA9955B (OM13483)
16-ch 57mA/20V CC LED driver Test/Demo Board
(Io_LED_MAX=28.6mA)
(Io_LED_MAX=38.25mA)
(Io_LED_MAX=57.3mA)
Quinary input pad connection to AD[2:0]
Open -> floating
1-2 -> VDD
3-4 -> Pull-up
5-6 -> Pull-down
7-8 -> GND
Ext /OE input
1-2: LED output control
Open -> Output disabled
Short -> Output enabled
Ext /RST input
9-pin female connector
to/from I2C 2005-1 board
9-pin male connector to/from
2nd PCA9955A/B demo board
(470ohm@100MHz)
14-pin header connector to/from
Win-I2CUSB I2C master to drive
PCA9955A/B demo board
GND
GND
LED max. output current setting:
1-2 -> Rext=1K, 57.3mA = 225uA x 255
3-4 -> Rext=1.5K, 38.25mA = 150 uA x 255
5-6 -> Rext=2K, 28.6mA = 112.5 x 255
AD0
AD1
AD2
closed to Vdd pin
5-pin male connector to/from
bus controller PCU9669 mini
board to drive PCA9955A/B
1-2 -> force reset
Open -> noraml
Note:
OM13399 can use to connect this 9-pin female connector
and convert to 14-pin for new I2C development board
Thermal pad 5.5 x 2.2 mm
add thermal vias 5 x 2
0.28 mm diameter with 1 mm pitch
with the barrel plated to about 1.0 ounce copper
(Green LED for
Vdd indicator)
open to measure
the U1 current
open (no PU)
for PCU9955A
1-2: normal I2C or SPI addressable
2-3: SPI daisy-chain
(SPI_SCLK)
(SPI_SCLK)
(SPI_SDI)
(Pins [5:9] to/from the
SPI master device)
(Pins [5:9] to/from the
2nd SPI slave PCA9955A
demo board)
(short 9-10 for SPI mode)
(short 9-10 for the last slave
device in SPI daisy-chain)
Pin #
2
3
4
26
27
PCA9955B
(I2C-bus)
AD0
AD1
AD2
SCL
SDA
PCA9745B
(SPI Daisy-Chain)
GND
SDO
/CS
SCLK
SDI
Jumper #
J7
J9
J10
NA
J8
(short 7-8 for PCA9745B)
SPI Daisy-Chain
SCL
SDA
VDD_IN
GND
+3.3V
+5V
SDA-Filter
SCL-Filter
VDD_IN
LED0
LED1
LED2
LED3
LED9
LED10
LED11
LED12
LED13
LED14
LED15
AD0
VDD_IN
/OE
SCL-Filter
/RESET
+5V
+3.3V
SCL
GND
SPI_SDI
SPI_CSN
+5V
+3.3V
SCL-Filter
SDA-Filter
SPI_CSN
VDD_IN
VDD_IN
SCL
SDA
+5V
+3.3V
GND
GND
LED[0:15]
SCL-Filter
SDA-Filter
+24V
+5V
SDA-Filter
SCL-Filter
GND
LED8
LED7
LED6
LED5
LED4
AD2
SPI_CSN
AD1
SPI_SDO
SPI_SDO
SPI_SDO
AD1
SDA
LED[0:15]
+3.3V
+5V
R10
0 ohm
R1
1k
TP2
1
J10
HEADER5x2
2
4
6
8
10
1
3
5
7
9
L2
BLM18BD471SN1
J4
1
2
L3
BLM18BD471SN1
R3
10K
TP1
1
U1
PCA9955A/PCA9955B
REXT
1
AD0
2
AD1
3
AD2
4
OE
5
LED0
6
LED1
7
LED2
8
LED3
9
LED4
11
LED5
12
LED6
13
LED7
14
Vss
10
LED8
15
LED9
16
LED10
17
LED11
18
LED12
20
Vss
19
LED13
21
LED14
22
LED15
23
RESET
25
SCL/USCL
26
SDA/USDA
27
Vdd
28
Vss
24
R9
1k
J2
JUMPER3x2
1
2
3
4
5
6
R5
1.1K
L1
HI1206N101R-10
CON2
9-pin Female
1
2
3
4
5
6
7
8
9
R22
10K
CON1
9-pin Male
1
2
3
4
5
6
7
8
9
R18
0 ohm
CON3
5-pin Male
1
2
3
4
5
D1
LTST-C170GKT
R19
31.6K
J5
1
2
R14
0 ohm
R20
34.8K
CON4
HEADER 7x2/SM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AVR-M1608C080M1
VAR
ISTOR
C6
10 uF
C2
10 uF
R12
34.8K
R15
31.6K
R21
0 ohm
R8
0 ohm
J8
1
2
3
J9
HEADER5x2
2
4
6
8
10
1
3
5
7
9
C7
0.01uF
R16
34.8K
R17
0 ohm
R2
1.5k
TP3
1
R6
2K
U2
PRTR5V0U2AX
GND
1
I/O1
2
I/O2
3
VCC
4
C3
0.1uF
R4
1.1K
J3
1
2
J7
JUMPER4x2
1
2
3
4
5
6
7
8
J11
1
2
C5
10 uF
C1
10 uF
J1
1
2
3
C4
4.7 uF
R13
0 ohm
J6
1
2
R11
31.6K
TP4
1
R7
0 ohm