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PDF PCA9546A Data sheet ( Hoja de datos )
| Número de pieza | PCA9546A | |
| Descripción | 4-channel I2C switch | |
| Fabricantes | NXP Semiconductors | |
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PCA9546A
4-channel I2C switch with reset
Rev. 03 — 6 April 2005
Product data sheet
1. General description
The PCA9546A is a quad bi-directional translating switch controlled via the I2C-bus. The
SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual
SCx/SDx channel or combination of channels can be selected, determined by the
contents of the programmable control register.
An active LOW reset input allows the PCA9546A to recover from a situation where one of
the downstream I2C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the
I2C-bus state machine and causes all the channels to be deselected as does the internal
Power-On Reset (POR) function.
The pass gates of the switches are constructed such that the VDD pin can be used to limit
the maximum high voltage which will be passed by the PCA9546A. This allows the use of
different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate
with 5 V parts without any additional protection. External pull-up resistors pull the bus up
to the desired voltage level for each channel. All I/O pins are 5 V tolerant.
2. Features
s 1-of-4 bi-directional translating switches
s I2C-bus interface logic; compatible with SMBus standards
s Active LOW reset input
s 3 address pins allowing up to 8 devices on the I2C-bus
s Channel selection via I2C-bus, in any combination
s Power-up with all switch channels deselected
s Low Ron switches
s Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
s No glitch on power-up
s Supports hot insertion
s Low stand-by current
s Operating power supply voltage range of 2.3 V to 5.5 V
s 5 V tolerant Inputs
s 0 kHz to 400 kHz clock frequency
s ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
s Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
s Three packages offered: SO16, TSSOP16, and HVQFN16
1 page  
Philips Semiconductors
PCA9546A
4-channel I2C switch with reset
6.2 Pin description
Table 3:
Symbol
A0
A1
RESET
SD0
SC0
SD1
SC1
VSS
SD2
SC2
SD3
SC3
A2
SCL
SDA
VDD
Pin description
Pin
SO, TSSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
HVQFN
15
16
1
2
3
4
5
6 [1]
7
8
9
10
11
12
13
14
Description
address input 0
address input 1
active LOW reset input
serial data 0
serial clock 0
serial data 1
serial clock 1
supply ground
serial data 2
serial clock 2
serial data 3
serial clock 3
address input 2
serial clock line
serial data line
supply voltage
[1] HVQFN package die supply ground is connected to both the VSS pin and the exposed center pad. The VSS
pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and
board-level performance, the exposed pad needs to be soldered to the board using a corresponding
thermal pad on the board, and for proper heat conduction through the board thermal vias need to be
incorporated in the PCB in the thermal pad region.
7. Functional description
Refer to Figure 1 “Block diagram of PCA9546A” on page 3.
7.1 Device address
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9546A is shown in Figure 5. To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
9397 750 14318
Product data sheet
1 1 1 0 A2 A1 A0 R/W
fixed
hardware
selectable
002aab189
Fig 5. Slave address
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.
Rev. 03 — 6 April 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
5 of 25
5 Page 
Philips Semiconductors
9. Application design-in information
PCA9546A
4-channel I2C switch with reset
VDD = 2.7 V to 5.5 V
SDA
SCL
I2C/SMBus master
Fig 14. Typical application
VDD = 3.3 V
SDA
SCL
SD0
SC0
RESET
SD1
SC1
PCA9546A
SD2
SC2
A2
A1 SD3
A0 SC3
VSS
002aab198
V = 2.7 V to 5.5 V
channel 0
V = 2.7 V to 5.5 V
channel 1
V = 2.7 V to 5.5 V
channel 2
V = 2.7 V to 5.5 V
channel 3
9397 750 14318
Product data sheet
Rev. 03 — 6 April 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
11 of 25
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet PCA9546A.PDF ] | |
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