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參數(shù)資料
| 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 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 92K |
| 代理商： | PCA9509 |
1.
General description
The PCA9509 is a level translating I
2
C-bus/SMBus repeater that enables processor low
voltage 2-wire serial bus to interface with standard I
2
C-bus or SMBus I/O. While retaining
all the operating modes and features of the I
2
C-bus system during the level shifts, it also
permits extension of the I
2
C-bus by providing bidirectional buffering for both the data
(SDA) and the clock (SCL) lines, thus enabling the I
2
C-bus or SMBus maximum
capacitance of 400 pF on the higher voltage side. The SDA and SCL pins are over-voltage
tolerant and 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
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 I
2
C-bus voltage level which
enables port B to connect to any other I
2
C-bus devices or buffer.
The PCA9509 drivers are not enabled unless V
CC(A)
is above 0.8 V and V
CC(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.
2.
Features
I
Bidirectional buffer isolates capacitance and allows 400 pF on port B of the device
I
Voltage level translation from port A (1 V to V
CC(B)
1.0 V) to port B (3.0 V to 5.5 V)
I
Requires no external pull-up resistors on lower voltage port A
I
Active HIGH repeater enable input
I
Open-drain inputs/outputs
I
Lock-up free operation
I
Supports arbitration and clock stretching across the repeater
I
Accommodates Standard-mode and Fast-mode I
2
C-bus devices and multiple masters
I
Powered-off high-impedance I
2
C-bus pins
I
Operating supply voltage range of 1.0 V to V
CC(B)
1.0 V on port A, 3.0 V to 5.5 V on
port B
I
5 V tolerant port B SCL, SDA and enable pins
PCA9509
Level translating I
2
C-bus/SMBus repeater
Rev. 01 — 27 June 2006
Product data sheet
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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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