PCA9691

General description

The PCA9691 is a single chip, single supply, low power, 8-bit CMOS data acquisition device with four analog inputs, one analog output and a serial I²C-bus interface. Three address pins (A0, A1 and A2) are used for programming the hardware address, allowing the use of up to 64 PCA9691 devices connected to the I²C-bus without additional hardware. Address, control and data to and from the PCA9691 are transferred via the serial two-line bidirectional I²C-bus.

The functions of the PCA9691 include:

• Analog input multiplexing
• On-chip sample and hold
• 8-bit Analog-to-Digital (A/D) conversion
• 8-bit Digital-to-Analog (D/A) conversion

The maximum conversion rate is given by the maximum frequency of the I²C-bus.

Features

• 8-bit successive approximation A/D conversion
• Four analog inputs programmable as single-ended or differential inputs
• 64 different addresses by three hardware address pins
• 1 MHz Fast-mode Plus (Fm+) I²C-bus via serial input/output
• Sampling rate given by I²C-bus frequency
• Single supply voltage; operating from 2.5 V to 5.5 V
• Low standby current
• Analog voltage from V_SS to V_DD
• Multiplying D/A Converter (DAC) with one analog output
• On-chip sample and hold circuit
• Auto-incremented channel selection

Products/packages

Pricing/ordering/availability

Applications

Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine

Technical documents

Application Notes

AN10441_1; Level shifting techniques in I²C-bus design (20-Jun-07)

Support Documents

75015669; Continuous innovation. Timeless lifespan. (01-Sep-06)

75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (13-Jun-06)

UM10204_3; I2C-bus specification and user manual (26-Jun-07)

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