PCA9541PW/03 NXP [NXP Semiconductors], PCA9541PW/03 Datasheet - Page 19

• Manufacturer Part Number: PCA9541PW/03
• Description: 2-to-1 I2C-bus master selector with interrupt logic and reset
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9541_5
Product data sheet
8.7 Voltage translation
The pass gate transistors of the PCA9541 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 PCA9541 to act as a voltage translator, the V
be equal to, or lower than the lowest bus voltage. For example, if the main buses were
running at 5 V, and the downstream bus was 3.3 V, then V
3.3 V to effectively clamp the downstream bus voltages. Looking at
V
PCA9541 supply voltage could be set to 3.3 V. Pull-up resistors can then be used to bring
the bus voltages to their appropriate levels (see
More Information on voltage translation can be found in Application Note AN262:
PCA954X family of I
Fig 8. Pass gate voltage as a function of supply voltage
o(sw)(max)
(1) maximum
(2) typical
(3) minimum
shows the voltage characteristics of the pass gate transistors (note that the graph
will be at 3.3 V when the PCA9541 supply voltage is 3.5 V or lower so the
2
V
C/SMBus multiplexers and switches .
o(sw)
(V)
Rev. 05 — 1 October 2007
5.0
4.0
3.0
2.0
1.0
2.0
2-to-1 I
2.5
2
C-bus master selector with interrupt logic and reset
3.0
3.5
Section 12 “Static characteristics”
4.0
Figure
(1)
(2)
(3)
4.5
17).
002aaa964
5.0
o(sw)
V
DD
(V)
5.5
should be equal to or below
Figure
2
o(sw)
C-bus to another.
PCA9541
© NXP B.V. 2007. All rights reserved.
voltage should
DD
8, we see that
of this data
voltage can
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