PCA9522 데이터 시트보기 (PDF) - NXP Semiconductors.
부품명
상세내역
제조사
PCA9522 Datasheet PDF : 20 Pages
| |||
NXP Semiconductors
PCA9522
Fast dual bidirectional bus buffer with hot insertion logic
fully bused compliant plug-in
(hot-insert) ShMC module (e.g., AMC)
(1)
R
R
RRA
μP
PCA9522
VI
VOL = VI + 0.08 V
Rd
PCA9521
Rd
enables
R
FET
switches
BACKPLANE
to ShMC #2
FRU with switching levels compliant
with the I2C-bus standard
R
PCA9522
μP
required VIL = 0.3VCC (max.) = 0.99 V
alternate
implementations
R
μP
I2C-bus
PCA9521
12 × PCA9521
isolating
bus buffers
Vmax = 0.5 V
(PICMG3.0)
Rd
ShMC1
ShMC2
PCA9521
Rd
PCA9521
enables
R
FET
switches
IPMB (× 24)
to ShMC #2
example of existing FRUs
built to PICMG3.0 R2.0
BUFFER
WITH RTA
R
μP
required VIL = 0.6 V (typ.)
etc.
002aaf289
The system shown here uses FET switches, however a valid alternative is to simply use 24 PCA9521s without FET switches.
Long track runs on the ShMC board and backplane can sometimes result in high frequency tuned circuits on either side of the
PCA9521. If your layout is prone to forming such tuned circuits, it is perfectly acceptable to use a ‘traditional’ damping resistor
(Rd) across the PCA9521.
(1) RRA = Rise Rate Accelerator.
Fig 9. PCA9522 used in an AdvancedTCA application in conjunction with the PCA9521
BC857BS
or equivalent
1 kΩ
3.3 V
BC857BS
or equivalent
1 kΩ
47 kΩ
22 pF
SCL
1.5 kΩ
10 kΩ
47 kΩ
22 pF
1.5 kΩ
10 kΩ
SDA
PCA9522
Product data sheet
DTC124E
(or equivalent)
Fig 10. Discrete rise rate accelerator circuit example
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 28 September 2011
002aaf323
© NXP B.V. 2011. All rights reserved.
10 of 20
Share Link: 