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| 型號(hào)： | PCA9509 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Level translating I2C-bus/SMBus repeater |
| 中文描述： | 級(jí)別翻譯I2C-bus/SMBus中繼器 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 92K |
| 代理商： | PCA9509 |
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PCA9509_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 27 June 2006
3 of 16
Philips Semiconductors
PCA9509
Level translating I
2
C-bus/SMBus repeater
5.
Pinning information
5.1 Pinning
5.2 Pin description
[1]
Port A and port B can be used for either SCL or SDA.
6.
Functional description
Refer to
Figure 1 “Functional diagram of PCA9509”
.
The PCA9509 enables I
2
C-bus or SMBus translation down to V
CC(A)
as low as 1.0 V
without degradation of system performance. The PCA9509 contains 2 bidirectional
open-drain buffers specifically designed to support up-translation/down-translation
between the low voltage and 3.3 V SMBus or 5 V I
2
C-bus. The port B I/Os are
over-voltage tolerant to 5.5 V even when the device is unpowered.
The PCA9509 includes a power-up circuit that keeps the output drivers turned off until
V
CC(B)
is above 2.5 V and the V
CC(A)
is above 0.8 V. V
CC(B)
and V
CC(A)
can be applied in
any sequence at power-up. After power-up and with the EN pin HIGH, a LOW level on
port A (below approximately 0.15 V) turns the corresponding port B driver (either SDA or
SCL) on and drives port B down to about 0 V. When port A rises above approximately
0.15 V, the port B pull-down driver is turned off and the external pull-up resistor pulls the
pin HIGH. When port B falls first and goes below 0.3V
CC(B)
, the port A driver is turned on
and port A pulls down to 0.2 V (typical). The port B pull-down is not enabled unless the
port A voltage goes below V
ILc
. If the port A low voltage goes below V
ILc
, the port B
Fig 2.
Pin configuration for TSSOP8
Fig 3.
Pin configuration for SO8
PCA9509DP
V
CC(A)
V
CC(B)
B1
A1
A2
B2
GND
EN
002aac126
1
2
3
4
6
5
8
7
PCA9509D
V
CC(A)
V
CC(B)
A1
B1
A2
B2
GND
EN
002aac127
1
2
3
4
6
5
8
7
Table 2.
Symbol
V
CC(A)
A1
[1]
A2
[1]
GND
EN
B2
[1]
B1
[1]
V
CC(B)
Pin description
Pin
1
2
3
4
5
6
7
8
Description
port A power supply
port A (lower voltage side)
port A
ground (0 V)
enable input (active HIGH)
port B (SMBus/I
2
C-bus side)
port B
port B power supply
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| PCA9511DP | Hot swappable I2C and SMBus bus buffer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9509A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Smart, simple solutions for the 12 most common design concerns |
| PCA9509ADP,118 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2CbusSMBus repeater RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9509ADP118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9509AGM,125 | 功能描述:接口-信號(hào)緩沖器、中繼器 I2CbusSMBus repeater RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9509D | 功能描述:接口-信號(hào)緩沖器、中繼器 I2C LV LVL TRANSLATR RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
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