Datasheet

PCA9512A_PCA9512B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6 — 1 March 2013 11 of 27
NXP Semiconductors
PCA9512A; PCA9512B
Level shifting hot swappable I
2
C-bus and SMBus bus buffer
Remark: Application assumes bus capacitance within ‘proper operation’ region of Figure 5 and Figure 6.
Fig 8. Hot swapping multiple I/O cards into a backplane using the PCA9512A with a custom connector
002aab792
R4
10 kΩ
C1
0.01 μF
SDAOUT
SCLOUT
ACC
V
CC2
GND
R5
10 kΩ
R6
10 kΩ
V
CC
SDAIN
SCLIN
CARD1_SDA
CARD1_SCL
STAGGERED CONNECTOR
I/O PERIPHERAL CARD 1
BACKPLANE
CONNECTOR
R2
10 kΩ
R1
10 kΩ
V
CC2
BACKPLANE
SDA
SCL
V
CC
R3
5.1 Ω
C2 0.01 μF
PCA9512A
R8
10 kΩ
C3
0.01 μF
SDAOUT
SCLOUT
ACC
V
CC2
GND
R9
10 kΩ
R10
10 kΩ
V
CC
SDAIN
SCLIN
CARD2_SDA
CARD2_SCL
STAGGERED CONNECTOR
I/O PERIPHERAL CARD 2
R7
5.1 Ω
C4 0.01 μF
PCA9512A
Remark: Application assumes bus capacitance within ‘proper operation’ region of Figure 5 and Figure 6.
Fig 9. 5 V to 3.3 V level translator and bus buffer
002aab793
R4
10 kΩ
C2
0.01 μF
SDAOUT
SCLOUT
ACC
V
CC
GND
SDAIN
SCLIN
R1
10 kΩ
V
CC
(5 V)
SDA
SCL
R3
10 kΩ
R2
10 kΩ
CARD_SDA
CARD_SCL
V
CC2
C1
0.01 μF
PCA9512A
CARD_V
CC
(3 V)