PCA9522 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCA9522 Datasheet PDF : 20 Pages
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NXP Semiconductors
PCA9522
Fast dual bidirectional bus buffer with hot insertion logic
PERIPHERAL CARD 1
R3
1.1 kΩ
R4
1.1 kΩ
(3.3 V) CARD
SUPPLY
R7
6.8 kΩ
C2
(3.3 V)
0.01 μF
VCC
SCLC SCLB
SDAC SDAB
PCA9522
RDY
EN GND
U1
backplane
R1
1.5 kΩ
VCC (5 V)
R2
1.5 kΩ
SCL
SDA
GND
PERIPHERAL CARD n
R5
600 Ω
R6
600 Ω
(1.8 V) CARD
SUPPLY
R8
3.6 kΩ
C2
(3.3 V)
0.01 μF
VCC
SCLC SCLB
SDAC SDAB
PCA9522
RDY
EN GND
U2
002aaf322
Fig 8. PCA9522 backplane application
An ideal backplane application for the PCA9522 is the Advanced Telecom Computing
Architecture (AdvancedTCA) as shown in Figure 9. The PCA9522 is well-suited to
placement on ‘Field Replaceable Units’ (FRUs) used in either a conventional fully-bused
arrangement (not shown) or in the low cost, high noise margin radial architecture example
as shown in Figure 10. It is fully interoperable with existing systems and components. If
required, Figure 10 shows a simple low-cost circuit for use at the Shelf Manager for
accelerating the rise in bused systems.
In each of these examples, the buffers are intended to extend total system capacitance
above 400 pF, so anticipate high capacitance on each side. When loading on one side is
small, adding 47 pF is suggested to avoid any waveform ripple, should it occur.
PCA9522
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 28 September 2011
© NXP B.V. 2011. All rights reserved.
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