PCA9545AD,112 NXP Semiconductors, PCA9545AD,112 Datasheet - Page 6

• Manufacturer Part Number: PCA9545AD,112
• Description: IC I2C SWITCH 4CH 20SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9545AD,112

• Applications: 4-Channel I²C Switcher
• Interface: I²C
• Voltage - Supply: 2.3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Package / Case: 20-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935275808112; PCA9545AD; PCA9545AD

NXP Semiconductors
6. Functional description
PCA9545A_45B_45C_7
Product data sheet
6.1 Device address
Refer to
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9545A is shown in
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the slave address defines the operation to be performed. When set to
logic 1, a read is selected while a logic 0 selects a write operation.
The PCA9545BPW and PCA9545CPW are alternate address versions if needed for larger
systems or to resolve conflicts. The data sheet will reference the PCA9545A, but the
PCA9545B and PCA9545C function identically except for the slave address.
Fig 5.
Fig 6.
1
Figure 1 “Block diagram of
Slave address PCA9545A
Slave address PCA9545B
1
fixed
0
1
Rev. 07 — 19 June 2009
0
selectable
hardware
A1
1
A0 R/W
002aab835
4-channel I
1
PCA9545A/45B/45C”.
fixed
1
0
2
C-bus switch with interrupt logic and reset
0
Fig 7.
PCA9545A/45B/45C
selectable
hardware
A1
1
A0 R/W
002aab169
Slave address PCA9545C
Figure
0
fixed
1
5. To conserve power, no
1
0
selectable
© NXP B.V. 2009. All rights reserved.
hardware
A1
002aab836
A0 R/W
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