Overview
The PCA9517AD,118 is a CMOS integrated circuit designed by NXP USA Inc. for use in I²C-bus and SMBus systems. This component is specifically engineered to provide level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) applications. It retains all the operating modes and features of the I²C-bus system during level shifts and extends the I²C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines.
Key Specifications
| Parameter | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC(A) Supply Voltage | Port A supply voltage | 0.9 | - | 5.5 | V |
| VCC(B) Supply Voltage | Port B supply voltage | 2.7 | - | 5.5 | V |
| ICC(VCC(A)) Supply Current | Supply current on pin VCC(A) | - | - | 1 | mA |
| ICCH HIGH-level Supply Current | HIGH-level supply current both channels HIGH; VCC = 5.5 V; SDAn = SCLn = VCC | - | 1.5 | 5 | mA |
| ILI Input Leakage Current | Input leakage current | - | - | ±1 | μA |
| VOL LOW-level Output Voltage | LOW-level output voltage | 0.1 | - | 0.2 | V |
| Cio Input/Output Capacitance | Input/output capacitance | 6 | - | 7 | pF |
| Package | SOIC-8, TSSOP-8, HWSON-8 | - | - | - | - |
Key Features
- 2-channel, bidirectional buffer that isolates capacitance and allows 400 pF on either side of the device.
- Voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V.
- Footprint and functional replacement for PCA9515/15A.
- I²C-bus and SMBus compatible.
- Active HIGH repeater enable input.
- Open-drain input/outputs.
- Lock-up free operation.
- Supports arbitration and clock stretching across the repeater.
- SDA and SCL pins are overvoltage tolerant and high-impedance when the PCA9517A is unpowered.
Applications
The PCA9517AD,118 is suitable for various applications requiring level shifting and signal buffering in I²C-bus and SMBus systems. These include:
- Embedded systems where voltage level translation is necessary.
- Industrial automation systems requiring robust I²C communication.
- Automotive systems where signal integrity over long cables is crucial.
- Consumer electronics that need to interface devices with different voltage levels.
- Medical devices requiring reliable and isolated I²C communication.
Q & A
- What is the primary function of the PCA9517AD,118?
The PCA9517AD,118 is a CMOS integrated circuit designed to provide level shifting and bidirectional buffering for I²C-bus and SMBus applications.
- What are the voltage ranges supported by the PCA9517AD,118?
The device supports voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V.
- What types of packages are available for the PCA9517AD,118?
The PCA9517AD,118 is available in SOIC-8, TSSOP-8, and HWSON-8 packages.
- Is the PCA9517AD,118 compatible with SMBus?
Yes, the PCA9517AD,118 is compatible with both I²C-bus and SMBus systems.
- What is the maximum capacitance supported on either side of the device?
The device can support up to 400 pF on either side.
- How does the PCA9517AD,118 handle overvoltage conditions?
The SDA and SCL pins are overvoltage tolerant and remain high-impedance when the device is unpowered.
- Can multiple PCA9517AD,118 devices be connected in series?
Yes, multiple devices can be connected in series without build-up in offset voltage, considering only time of flight delays.
- What is the purpose of the EN pin on the PCA9517AD,118?
The EN pin is used to turn the drivers on and off under system control.
- What are some common applications for the PCA9517AD,118?
Common applications include embedded systems, industrial automation, automotive systems, consumer electronics, and medical devices.
- Is the PCA9517AD,118 lock-up free?
Yes, the PCA9517AD,118 operates in a lock-up free manner.
- Does the PCA9517AD,118 support arbitration and clock stretching?
Yes, the device supports arbitration and clock stretching across the repeater.
