General description
The PCA9665/PCA9665A serves as an interface between most standard parallel-bus
microcontrollers/microprocessors and the serial I2C-bus and allows the parallel bus
system to communicate bidirectionally with the I2C-bus. The PCA9665/PCA9665A can
operate as a master or a slave and can be a transmitter or receiver. Communication with
the I2C-bus is carried out on a Byte or Buffered mode using interrupt or polled handshake.
The PCA9665/PCA9665A controls all the I2C-bus specific sequences, protocol, arbitration
and timing with no external timing element required.
The PCA9665 and PCA9665A have the same footprint as the PCA9564 with additional
features:
• 1 MHz transmission speeds
• Up to 25 mA drive capability on SCL/SDA
• 68-byte buffer
• I2C-bus General Call
• Software reset on the parallel bus

Features and benefits
 Parallel-bus to I2C-bus protocol converter and interface
 Both master and slave functions
 Multi-master capability
 Internal oscillator trimmed to 15 % accuracy reduces external components
 1 Mbit/s and up to 25 mA SCL/SDA IOL (Fast-mode Plus (Fm+)) capability
 I2C-bus General Call capability
 Software reset on parallel bus
 68-byte data buffer
 Operating supply voltage: 2.3 V to 3.6 V
 5 V tolerant I/Os
 Standard-mode and Fast-mode I2C-bus capable and compatible with SMBus
 PCA9665A ‘glitch-free’ restart is suitable for use with buffer drivers
 ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22-C101
 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
 Packages offered:
 PCA9665: SO20, TSSOP20, HVQFN20
 PCA9665A: TSSOP20