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ADS7924 Datasheet

Analog-to-Digital Converter

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ADS7924
SBAS482C – JANUARY 2010 – REVISED SEPTEMBER 2017
ADS7924 2.2 V, 12-Bit, 4-Channel, MicroPOWER
Analog-to-Digital Converter With I2C Interface
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-to-
digital 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS7924
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
MUX OUT
Simplified Schematic
ADCIN
AVDD
DVDD
CH0
CH1
CH2
CH3
4-Channel
MUX
SAR
ADC
Oscillator
Data Buffers,
Sequencer, and
Alarms
I2C
Interface
SDA
SCL
A0
INT
PWRCON
RESET
AGND
DGND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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ADS7924 Datasheet Preview

ADS7924 Datasheet

Analog-to-Digital Converter

No Preview Available !

ADS7924
SBAS482C – JANUARY 2010 – REVISED SEPTEMBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 I2C Timing Requirements.......................................... 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
7.5 Programming........................................................... 20
7.6 Register Map........................................................... 26
8 Application and Implementation ........................ 33
8.1 Application Information............................................ 33
8.2 Typical Application ................................................. 39
9 Power Supply Recommendations...................... 41
10 Layout................................................................... 41
10.1 Layout Guidelines ................................................. 41
10.2 Layout Example .................................................... 41
11 Device and Documentation Support ................. 42
11.1 Receiving Notification of Documentation Updates 42
11.2 Community Resources.......................................... 42
11.3 Trademarks ........................................................... 42
11.4 Electrostatic Discharge Caution ............................ 42
11.5 Glossary ................................................................ 42
12 Mechanical, Packaging, and Orderable
Information ........................................................... 42
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (September 2015) to Revision C
Page
• Changed QFN to WQFN throughout document .................................................................................................................... 1
• Changed direction of RESET arrow in Simplified Schematic figure....................................................................................... 1
• Changed maximum operating temperature range in Absolute Maximum Ratings table ........................................................ 4
• Changed direction of RESET arrow in Functional Block Diagram figure ............................................................................ 10
• Changed description of bits 7:5 in INTCONFIG: Interrupt Configuration Register .............................................................. 30
Changes from Revision A (May 2010) to Revision B
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
2
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Copyright © 2010–2017, Texas Instruments Incorporated



Part Number ADS7924
Description Analog-to-Digital Converter
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