PCA9621D NXP [NXP Semiconductors], PCA9621D Datasheet - Page 10

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

NXP Semiconductors
PCA9621
Product data sheet
Figure 12
plus decimal point can be driven from a single PCA9621. By using the address pins, up to
8 digits can be addressed from a single bus. When running at 1 MHz, all 8 digits can be
updated in less than 0.2 ms.
Further, by using the arrangement described above and shown in
of digits driven may be increased significantly.
Figure 13
2-wire bus buffers to form a multiplexer arrangement. Using the PCA9621 to control
multiples of either PCA9521 or PCA9522 produces an isolating bus switch/multiplexer
that has fully compliant I
Using PCA9522 in this arrangement additionally provides ‘hot-swap’ capability.
Fig 12. PCA9621 as 7-segment display driver
Fig 13. PCA9621 as part of a fully isolating I
(1) Or PCA9525 (400 pF), or PCA9605 (4000 pF), or PCA9646 (4 × 4000 pF).
Address lines allow this structure to be repeated 8 more times.
shows a simple 7-segment display drive arrangement. All of the 7 segments
shows the PCA9621 used in conjunction with other NXP Semiconductors
SDA
SCL
All information provided in this document is subject to legal disclaimers.
3
SDA
SCL
U1
SCL
SDA
A[2:0]
RESET
3
PCA9621
Rev. 1 — 9 March 2011
2
C-bus I/O levels, low offset voltages, and large noise margins.
V
DD
U1
SCL
SDA
A[2:0]
RESET
PCA9621
P0
P1
P2
P3
P4
P5
P6
P7
V
5 V
DD
R1
P0
P1
P2
P3
P4
P5
P6
P7
R2
R1
2
C-bus multiplexer
repeat up to 8 times using
address pins on PCA9621
R2
65 mA 8-bit 2-wire bus output port
U2
U3
SA1
SB1
EN
SCLC
SDAC
EN
PCA9521
PCA9522
3.3 V
3.3 V
V
V
CC
CC
SCLB
SDAB
RDY
SA2
SB2
(1)
(1)
Figure
002aaf398
PCA9621
© NXP B.V. 2011. All rights reserved.
400 pF
400 pF
multiple
isolated
11, the number
buses
002aaf399
(1)
(1)
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