1 Features

1• Intelligent Monitoring:

– Auto-Sequencing of 4-Channel Multiplexer

– Individual Alarm Thresholds for Each Channel

– Programmable Scan Rate

• MicroPOWER™ Monitoring:

– Four-Channel Scanning:

– Every 1 ms → 25 μW

– Every 10 ms → 5 μW

– < 1 μA of Power-Down Current

– Programmable Interrupt Pin Controls

Shutdown/Wakeup of the Microcontroller

– Auto Power-Down Control

– PWRCON Pin Allows Shutdown of External

Operational Amplifiers

• Wide Supply Range:

– Analog Supply: 2.2 V to 5.5 V

– Digital Supply: 1.65 V to 5.5 V

• Small Footprint: 3-mm × 3-mm WQFN

2 Applications

• Portable and Battery-Powered Systems:

– Medical, Communications, Remote Sensor

Signal Monitoring, Power-Supply Monitoring

• Energy Harvesting

3 Description

The ADS7924 is a four-channel, 12-bit, analog-todigital

converter (ADC) with an I2C™ interface. With

its low-power ADC core, support for low-supply

operation, and a flexible measurement sequencer

that essentially eliminates power consumption

between conversions, the ADS7924 forms a complete

monitoring system for power-critical applications such

as battery-powered equipment and energy harvesting

systems.

The ADS7924 features dedicated data registers and

onboard programmable digital threshold comparators

for each input. Alarm conditions can be programmed

that generate an interrupt. The combination of data

buffering, programmable threshold comparisons, and

alarm interrupts minimize the host microcontroller

time needed to supervise the ADS7924.

The four-channel input multiplexer (MUX) is routed

through external pins to allow a common signal

conditioning circuit to be used between the MUX and

ADC, thereby reducing overall component count. The

low-power ADC uses the analog supply as its

reference and can acquire and convert signals in only

10 μs. An onboard oscillator eliminates the need to

supply a master clock.

The ADS7924 is offered in a small 3-mm × 3-mm

WQFN and is fully specified for operation over the

industrial temperature range of –40°C to 85°C.