The ADC128D818 I2C
system monitor is designed for maximum flexibility. The system monitor can be configured for
single-ended and/or pseudo-differential inputs. An onboard temperature sensor, combined with
WATCHDOG window comparators, and an interrupt output pin, INT, allow easy
monitoring and out-of-range alarms for every channel. A high performance internal reference is also
available to provide for a complete solution in the most difficult operating conditions.
The ADC128D818s 12-bit delta-sigma ADC supports Standard Mode (Sm, 100 kbps) and Fast
Mode (Fm, 400 kbps) I2C interfaces. The ADC128D818 includes a sequencer
to control channel conversions and stores all converted results in independent registers for easy
microprocessor retrieval. Unused channels can be shut down independently to conserve power.
The ADC can use either an internal 2.56-V reference or a variable external reference. An
analog filter is included on the I2C digital control lines to provide
improved noise immunity. The device also includes a TIME-OUT reset function on SDA and SCL to
prevent I2C bus lock-up.
The ADC128D818 operates from 3-V to 5.5-V power supply voltage range, –40°C to 125°C
temperature range, and the device is available in a 16-pin TSSOP package.