PCA9509D Level translating I²C-bus/SMBus repeater
The PCA9509 is a level translating I²C-bus/SMBus repeater that enables processor low voltage 2-wire serial bus to interface with standard I²C-bus or SMBus I/O. While retaining all the operating modes and features of the I²C-bus system during the level shifts, it also permits extension of the I²C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling the I²C-bus or SMBus maximum capacitance of 400 pF on the higher voltage side. Port A allows a voltage range from 1.0 V (as low as 0.95 V in special cases) to VCC(B) - 1.0 V and requires no external pull-up resistors due to the internal current source. Port B allows a voltage range from 3.0 V to 5.5 V and is overvoltage tolerant. Both port A and port B SDA and SCL pins are high-impedance when the PCA9509 is unpowered.
The bus port B drivers are compliant with SMBus I/O levels, while port A uses a current sensing mechanism to detect the input or output LOW signal which prevents bus lock-up. Port A uses a 1 mA current source for pull-up and a 200 Ω pull-down driver. This results in a LOW on the port A accommodating smaller voltage swings. The output pull-down on the port A internal buffer LOW is set for approximately 0.2 V, while the input threshold of the internal buffer is set about 50 mV lower than that of the output voltage LOW. When the port A I/O is driven LOW internally, the LOW is not recognized as a LOW by the input. This prevents a lock-up condition from occurring. The output pull-down on the port B drives a hard LOW and the input level is set at 0.3 of SMBus or I²C-bus voltage level which enables port B to connect to any other I²C-bus devices or buffer.
The PCA9509 drivers are not enabled unless VCC(A) is above 0.8 V and VCC(B) is above 2.5 V. The enable (EN) pin can also be used to turn the drivers on and off under system control. Caution should be observed to only change the state of the EN pin when the bus is idle
产品特点 Features
|
应用
- 服务器
- RAID系统
- 工业控制
- 医疗设备
- PLC
- 手机
- 赌博机
- 仪器和测试测量
功能框图
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封装
| 型号 |
可订购的器件编号 |
订购码 (12NC) |
产品状态 |
封装 |
| PCA9509D |
9352 822 27118 |
PCA9509D,118 |
量产 |
SO8
(SOT96-1) |
| PCA9509D |
9352 822 27112 |
PCA9509D,112 |
量产 |
SO8
(SOT96-1) |
订货和供应
| 型号 |
订购码 (12NC) |
可订购的器件编号 |
化学成分 |
| PCA9509D |
9352 822 27118 |
PCA9509D,118 |
PCA9509D |
| PCA9509D |
9352 822 27112 |
PCA9509D,112 |
PCA9509D |
PCA9509D 技术支持
| 档案名称 |
标题 |
类型 |
格式 |
| PCA9509D |
Level translating I2C-bus/SMBus repeater |
Data sheet |
pdf |
| AN10441 |
Level shifting techniques in I2C-bus design
|
Application note |
pdf |
| AN255 |
I2C / SMBus Repeaters, Hubs and Expanders
|
Application note |
pdf |
| AN10710 |
Features and applications of the PCA9509 I2C-bus extender
|
Application note |
pdf |
| 75016527 |
Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9509 in a proven application
|
Brochure |
pdf |
| 75016532 |
Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9515x and 5-channel I2C-bus hubs PCA9516x
|
Leaflet |
pdf |
| 75016080 |
Extend the reach of any I2C-bus system without special offset voltage levels; NXP I2C-bus extender PCA9509
|
Leaflet |
pdf |
| 75017424 |
NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns
|
Leaflet |
pdf |
| UM10204 |
I2C-bus specification and user manual
|
User manual |
pdf |
| UM10206 |
I2C Demonstration Board 2005-1 Quick Start Guide
|
User manual |
pdf |
| UM10323 |
PCA9600 demonstration board OM6293
|
User manual |
pdf |
