PCA9525D NXP [NXP Semiconductors], PCA9525D Datasheet - Page 11

• Manufacturer Part Number: PCA9525D
• Description: Simple 2-wire bus buffer
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9525
Product data sheet
Figure 15
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
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’.
Fig 14. PCA9525 typical buffer application
U3
BUS MASTER
3.3 V
V
DD
shows the PCA9525 used with masters on both sides of the buffer. More than
SDA
SCL
All information provided in this document is subject to legal disclaimers.
(R1 and R2 = 110 Ω)
or 4 nF load if only
up to 400 pF load
PCA9605's used
U4
R1
1.1 kΩ
MASTER/
(PCA9525)
SLAVE
Rev. 1 — 25 February 2011
R2
1.1 kΩ
U1
U2
SCL_IN
SDA_IN
EN
DIR
SCL_IN
SDA_IN
EN
DIR
PCA9525
PCA9605
V
V
DD
DD
up to 400 pF load (PCA9525)
up to 4 nF load (PCA9605)
SDA_OUT
SDA_OUT
SCL_OUT
SCL_OUT
R3
1.1 kΩ
R5
110 Ω
U5
U7
Simple 2-wire bus buffer
SLAVE
SLAVE
Figure
PCA9525
© NXP B.V. 2011. All rights reserved.
R4
1.1 kΩ
R4
110 Ω
U6
U8
15, U4 uses an
SLAVE
SLAVE
002aaf342
11 of 22
SCL
SDA
SCL
SDA