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參數資料
| 型號： | PCA9519 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-channel level translating I2C-bus/SMBus repeater |
| 中文描述： | 4通道級翻譯I2C-bus/SMBus中繼器 |
| 文件頁數： | 1/17頁 |
| 文件大小： | 99K |
| 代理商： | PCA9519 |
1.
General description
The PCA9519 is a 4-channel level translating I
2
C-bus/SMBus repeater that enables the
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 PCA9519 is unpowered.
The 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.
The port A uses a 1 mA current source for pull-up and a 200
pull-down driver. This
results in a LOW on 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 device or buffer.
The PCA9519 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
4-channel (4 SCL/SDA pairs), 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 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 V on port A, 3.0 V to 5.5 V on
port B
I
5 V tolerant B-side SCL and SDA and enable pins
PCA9519
4-channel level translating I
2
C-bus/SMBus repeater
Rev. 01 — 22 June 2006
Objective data sheet
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PDF描述 |
|---|---|
| PCA9540B | 2-channel I2C multiplexer |
| PCA9540PWDH | 2-channel I2C multiplexer |
| PCA9540 | 2-channel I2C multiplexer |
| PCA9540D | 2-channel I2C multiplexer |
| PCA9541 | 2-to-1 I2C master selector with interrupt logic and reset |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCA9519BS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-channel level translating I2C-bus/SMBus repeater |
| PCA9519BS,118 | 功能描述:接口-I/O擴展器 4CH LVLTRAN RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9519BS-T | 功能描述:接口-信號緩沖器、中繼器 4CH LVLTRAN I2C/SMBUS REPEATER RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9519PW | 功能描述:接口-信號緩沖器、中繼器 4CH LVLTRAN I2C/SMBUS REPEATER RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
| PCA9519PW,112 | 功能描述:接口-信號緩沖器、中繼器 4CH LVLTRAN RoHS:否 制造商:Texas Instruments 工作電源電壓: 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:VSSOP-8 封裝:Reel |
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