NXP Fast-mode Plus 8-bit A/D and D/A converter 1-MHz I2C-bus analog-to-digital and digital-to-analog converter Compatible with Fast-mode Plus, this is the first AD/DA device capable of communication at I2C-bus speeds up to 1 MHz — ten times faster. Key features 4 Single power supply 4 Operating supply voltage 2.5 V to 5.5 V 4 Low standby current 4 1-MHz Fast-mode Plus I2C-bus via serial input/output 4 Address by three hardware address pins 4 Sampling rate given by I2C-bus speed 4 Four analog inputs programmable as single ended or differential inputs 4 Auto-incremented channel selection 4 Analog voltage range from VSS to VDD 4 On-chip track and hold circuit 4 8 -bit successive approximation A/D conversion 4 Multiplying DAC with one analog output. Applications 4 Base stations 4 Audio distribution 4 Personal alarm system 4 High-quality printers for labels 4 Highway equipment 4 Acoustic alerts 4 Industrial control 4 Video surveillance 4 Temperature control 4 Signalization board 4 Power management units The PCA9691 is a single-chip, singlesupply 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 devices connected to the I2C-bus without additional hardware. Address, control and data to and from the device are transferred serially via the two-line bidirectional I2C-bus. Two functions are available: an 8-bit analog-to-digital converter with four multiplexed inputs utilizing on-chip track and hold function and a one channel 8-bit digital to analog converter. The maximum conversion rate is given by the maximum speed of the I2C-bus. The high conversion rate of more than 100k samples per second allows also audio signal distribution. Fast control loops can now be established, without occupying the bus continuously. The large variety of input configurations allows simple monitoring of measuring bridges, grounded or floating signals. The device can operate in Standard and Fast-mode. The operating supply voltage is 2.5 to 6.0 V. For the analog part separate ground pin is available. If bus frequency is below 500 kHz a low power mode can be activated. The I2C-bus clock frequency is 0 to 1 MHz, and the SDA and SCL outputs are capable of driving 30 mA. The operating temperature range is –40 to +85 ºC. SCL SDA A0 A1 I2C-bus interface Status register PCA9691 A2 ESD protection exceeds 2000V HBM per JESD22-A114, 200V MM per JESD22A115, and 1000V CDM per JESD22C101. Latch-up testing, performed in accordance with JEDEC Standard JESD78, exceeds 100 mA. For more information visit www.nxp.com/i2clogic DAC data register ADC data register EXT VDD VSS Power on reset Control logic Oscillator OSC AIN0 AIN1 AIN2 Analog multiplexer – Sample and hold AIN3 AOUT Successive approximation register/logic + Comparator Sample and hold DAC PCA9691 block diagram Comparison of PCF8591 and PCA9691 A/D, D/A converter Characteristics PCA9691 PCF8591 1000 kHz 100 kHz Voltage range Maximum I2C-bus frequency Maximum conversion rate 110,000 samples / sec 11,000 samples / sec Number of device addresses 64 8 Ordering information Package Tube, 112 DIP 16 PCF8591P SO 16 PCA9691T, PCF8591T PCA9691T, PCF8591T PCA9691BS HVQFN 20 TSSOP16 Tape and Reel, 118 PCA9691TS PCA9691TS www.nxp.com © 2006 NXP N.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The Date of release: November 2006 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and Document order number: 9397 750 15685 may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof Printed in the USA does not convey nor imply any license under patent- or other industrial or intellectual property rights. VREF AGND