參數(shù)資料
型號: PCA9543
廠商: NXP Semiconductors N.V.
英文描述: 2-channel I2C switch with interrupt logic and reset
中文描述: 2通道的I2C中斷邏輯開關(guān)和復(fù)位
文件頁數(shù): 5/15頁
文件大小: 120K
代理商: PCA9543
Philips Semiconductors
Product data sheet
PCA9543
2-channel I
2
C switch with interrupt logic and reset
2004 Oct 01
5
VOLTAGE TRANSLATION
The pass gate transistors of the PCA9543 are constructed such that
the V
DD
voltage can be used to limit the maximum voltage that will
be passed from one I
2
C-bus to another.
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
V
pass
vs. V
DD
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
pass
V
DD
MINIMUM
TYPICAL
MAXIMUM
SW00820
2.0
Figure 5. V
pass
voltage
Figure 5 shows the voltage characteristics of the pass gate
transistors (note that the graph was generated using the data
specified in the DC Characteristics section of this datasheet). In
order for the PCA9543 to act as a voltage translator, the V
pass
voltage should 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
pass
should be equal to or below
2.7 V to effectively clamp the downstream bus voltages. Looking at
Figure 5, we see that V
pass
(max.) will be at 2.7 V when the
PCA9543 supply voltage is 3.5 V or lower so the PCA9543 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 Figure 12).
More Information can be found in Application Note AN262 PCA954X
family of I
2
C/SMBus multiplexers and switches.
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