PCA9525DP 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCA9525DP Datasheet PDF : 22 Pages
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NXP Semiconductors
PCA9525
Simple 2-wire bus buffer
3.3 V
VDD
SCL
SDA
BUS MASTER
R1
1.1 kΩ
R2
1.1 kΩ
U3
MASTER/
SLAVE
U4
up to 400 pF load
(PCA9525)
or 4 nF load if only
PCA9605's used
(R1 and R2 = 110 Ω)
VDD
SCL_IN SCL_OUT
SDA_IN SDA_OUT
EN
PCA9525
DIR
U1
R3
1.1 kΩ
R4
1.1 kΩ
SLAVE
SLAVE
U5
U6
up to 400 pF load (PCA9525)
SCL
SDA
VDD
SCL_IN SCL_OUT
SDA_IN SDA_OUT
EN
PCA9605
DIR
U2
R5
110 Ω
R4
110 Ω
SCL
SDA
SLAVE
SLAVE
U7
U8
up to 4 nF load (PCA9605)
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Fig 14. PCA9525 typical buffer application
Figure 15 shows the PCA9525 used with masters on both sides of the buffer. More than
one master may be used on the Sxx_IN side of the IC. However, to locate a master on the
Sxx_OUT side and have that master be able to communicate with devices on the Sxx_IN
side, it must either have direct control over the direction pin (DIR) of the PCA9525, or it
must request another controlling master to change the direction. In Figure 15, U4 uses an
IRQ to signal to U2 that is requests a direction change. Once in control, it could
alternatively use the bus to signal ‘release of control’.
PCA9525
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 25 February 2011
© NXP B.V. 2011. All rights reserved.
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