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參數(shù)資料
| 型號： | 935268565118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 編、解碼器及復用、解復用 |
| 英文描述： | 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO20 |
| 封裝： | 7.50 MM, PLASTIC, MS-013, SOT-163-1, SO-20 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 137K |
| 代理商： | 935268565118 |
Philips Semiconductors
Product data
PCA9544
4-channel I2C multiplexer with interrupt logic
2002 Jul 26
6
VOLTAGE TRANSLATION
The pass gate transistors of the PCA9544 are constructed such that
the VDD voltage can be used to limit the maximum voltage that will
be passed from one I2C bus to another.
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
Vpass vs. VDD
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Vpass
VDD
MINIMUM
TYPICAL
MAXIMUM
SW00820
2.0
Figure 6. Vpass voltage
Figure 6 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 Vpass
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 Vpass should be equal to or below
2.7 V to effectively clamp the downstream bus voltages. Looking at
Figure 6, we see that Vpass (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 13).
More Information can be found in Application Note AN262
PCA954X
family of I2C/SMBus multiplexers and switches.
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