PCA9543AD,118 NXP Semiconductors, PCA9543AD,118 Datasheet - Page 7

• Manufacturer Part Number: PCA9543AD,118
• Description: IC I2C SWITCH 2CH 14-SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9543AD,118

• Applications: 2-Channel I²C Multiplexer
• Interface: I²C, SMBus
• Voltage - Supply: 2.3 V ~ 5.5 V
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Mounting Type: Surface Mount
• For Use With: OM6285 - EVAL BOARD I2C-2002-1A568-4002 - DEMO BOARD I2C568-3615 - DEMO BOARD I2C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-1857-2; 935275803118; PCA9543AD-T

NXP Semiconductors
PCA9543A_43B_43C_6
Product data sheet
6.3 RESET input
6.4 Power-on reset
6.5 Voltage translation
Remark: Two interrupts can be active at the same time.
The RESET input is an active LOW signal which may be used to recover from a bus fault
condition. By asserting this signal LOW for a minimum of t
its registers and I
must be connected to V
When power is applied to V
a reset condition until V
and the PCA9543A registers and I
states (all zeroes) causing all the channels to be deselected. Thereafter, V
lowered below 0.2 V to reset the device.
The pass gate transistors of the PCA9543A are constructed such that the V
be used to limit the maximum voltage that will be passed from one I
Figure 8
was generated using the data specified in
sheet). In order for the PCA9543A to act as a voltage translator, the V
be equal to, or lower than the lowest bus voltage. For example, if the main bus was
running at 5 V, and the downstream buses were 3.3 V and 2.7 V, then V
equal to or below 2.7 V to effectively clamp the downstream bus voltages. Looking at
Fig 8.
(1) maximum
(2) typical
(3) minimum
shows the voltage characteristics of the pass gate transistors (note that the graph
Pass gate voltage versus supply voltage
2
C-bus state machine and will deselect all channels. The RESET input
V
o(sw)
(V)
Rev. 06 — 15 June 2009
DD
5.0
4.0
3.0
2.0
1.0
DD
2.0
has reached V
through a pull-up resistor.
DD
, an internal Power-On Reset (POR) holds the PCA9543A in
2.5
2-channel I
2
C-bus state machine are initialized to their default
3.0
POR
3.5
Section 10 “Static characteristics”
2
C-bus switch with interrupt logic and reset
. At this point, the reset condition is released
4.0
PCA9543A/43B/43C
(1)
(2)
(3)
4.5
002aaa964
5.0
V
w(rst)L
DD
(V)
5.5
, the PCA9543A will reset
2
C-bus to another.
o(sw)
© NXP B.V. 2009. All rights reserved.
o(sw)
DD
voltage should
DD
should be
of this data
must be
voltage can
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