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| 型號(hào)： | PCA9544D |
| 英文描述： | BUS CONTROLLER |
| 中文描述： | 總線控制器 |
| 文件頁(yè)數(shù)： | 5/14頁(yè) |
| 文件大?。?/td> | 113K |
| 代理商： | PCA9544D |
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Philips Semiconductors
Product data
PCA9544
4-channel I
2
C multiplexer with interrupt logic
2002 Feb 20
5
VOLTAGE TRANSLATION
The pass gate transistors of the PCA9544 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 PCA9544 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
PCA9544 supply voltage is 3.5 V or lower so the PCA9544 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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| PCA9545ABS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-channel I2C-bus switch with interrupt logic and reset |
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