PCA9515APWR

PCA9515APWR is a dual bidirectional I2C-bus buffer/level shifter from NXP. It bridges two I2C buses that run on different supply voltages (VCCA and VCCB) while preserving I2C signaling.
Key points:
- Two independent bidirectional channels; each side buffers and level-translates I2C signals, isolating bus capacitance and noise.
- Supports standard and fast-mode I2C/SMBus; open-drain I2C compatibility; no direction pin required; low propagation delay.
- Enables interfaces between devices on separate voltage domains (e.g., a 3.3V MCU and 5V I2C devices).
- Helps protect a microcontroller from high bus loading and improves signal integrity in mixed-voltage systems.
Implementation notes:
- Use pull-ups on both sides to their respective voltages.
- Ensure total bus capacitance stays within datasheet limits.
- See the datasheet for pinout and recommended circuit configurations.
APWR indicates a RoHS-compliant, lead-free variant in a specific package.

Direct equivalents outside NXP don’t exist. PCA9515APWR is the 2-channel I2C bus repeater in the PCA95xx family. Closest cross-references: PCA9515A, PCA9516A, PCA9517A. For non-NXP options, use a generic I2C level shifter/repeater such as NXP PCA9306; TI TXS0102/TXS0104 are general bidirectional level shifters (not drop-in for I2C).

PCA9515APWR features (concise):
- Dual bidirectional I2C-bus repeater with voltage level translation between two I2C buses
- Independent supply rails on each side (VCCA and VCCB) for different voltage domains
- Supports I2C Standard-Mode (100 kHz) and Fast-Mode (400 kHz) on both sides
- EN input to disable both channels (buses become isolated)
- Open-drain interface; pull-ups required on both sides
- Pb-free, RoHS-compliant package (APWR); suitable for wide-temp automotive/industrial use (-40°C to 125°C typical)
- Used for I2C bus extension and safe level shifting between mixed-voltage systems.

Pin count: 8 pins (8‑pin package).
Function: I2C-bus buffer/repeater that links two I2C buses (SDA/SCL on each side) with separate supply rails, providing bidirectional buffering/level shifting and enabling isolation of the two buses (includes an enable input to tri‑state the buffers).

Manufacturer: NXP Semiconductors N.V.
What kind of company: NXP is a Dutch multinational semiconductor company (formerly Philips Semiconductors) that designs and manufactures integrated circuits for automotive, industrial, IoT, and consumer electronics.

Applications of PCA9515APWR:
- I2C bus buffering and level shifting between two voltage domains (e.g., 3.3V↔5V, 1.8V↔3.3V)
- Extending I2C bus length and reducing load on the master by isolating bus segments
- Isolating noisy or fault-prone sections to improve EMI/noise immunity
- Interconnecting devices across different boards, encloses, or domains (multi-domain sensor/actuator networks)
- Automotive, industrial, and consumer electronics where modular, multi-segment I2C networks are needed

PCA9515APWR comes in a 20‑pin TSSOP (SSOP) package and is RoHS Pb‑free.