PCA9621D NXP [NXP Semiconductors], PCA9621D Datasheet - Page 9

• Manufacturer Part Number: PCA9621D
• Description: 65 mA 8-bit 2-wire bus output port
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
11. Application information
PCA9621
Product data sheet
Fig 11. PCA9621 in a large LED array
buses SC2/SD2, SC3/SD3
Entire structure can be repeated
8 times using PCA9646 address pins
(further expansion possible).
SC0/SD0, SC1/SD1
as shown for
U2
BUS MASTER
V
5 V
DD
SDA
SCL
SC2
SD2
SC3
SD3
Figure 11
drive application. Each PCA9621 can drive 8 LEDs, and using the address pins on the IC,
up to 8 uniquely addressed devices can sit on one bus branch. The PCA9646 has four
such outputs, giving 256 LEDs in the structure shown.
By additionally using the address pins on the PCA9646, the entire structure may be
repeated 8 times, allowing 2048 LEDs to be uniquely driven. By additionally placing
PCA9646’s in series (refer to the PCA9646 data sheet), the structure may be further
extensively multiplied into a huge array.
R1
R3
R5
shows the PCA9621 in conjunction with the PCA9646 bus multiplexer in a LED
R2
R4
R6
All information provided in this document is subject to legal disclaimers.
U1
SCL
SDA
RESET
SC2
SD2
SC3
SD3
A0
A1
A2
V
SS
PCA9646
V
Rev. 1 — 9 March 2011
DD
SC0
SD0
SC1
SD1
U3
U11
R7
R9
PCA9621
PCA9621
P[7:0]
P[7:0]
8 LEDs = 64 LEDs
8 LEDs = 64 LEDs
8 × PCA9621
8 × PCA9621
8
8
each with
each with
8 LEDs
8 LEDs
65 mA 8-bit 2-wire bus output port
R8
R10
U10
U18
PCA9621
PCA9621
P[7:0]
P[7:0]
8
8
PCA9621
8 LEDs
8 LEDs
© NXP B.V. 2011. All rights reserved.
SC0
SD0
SC1
SD1
002aaf397
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