Texas Instruments ISO7021 Handleiding

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ISO7021 Ultra-Low Power Two-Channel Digital Isolator

1 Features

•Ultra-low power consumption

–4.8μA per channel quiescent current (3.3V)

–15μA per channel at 100kbps (3.3V)

–120μA per channel at 1Mbps (3.3V)

•Robust isolation barrier

–>100-year projected lifetime

–3000V

RMS

isolation rating

–±100kV/μs typical CMTI

•Wide supply range: 1.71V to 1.89V and 2.25V to

5.5V

•Wide temperature range: –55°C to 125°C

•Small 8-SOIC package (8-D)

•Signaling rate: Up to 4Mbps

•Default output High (ISO7021) and Low

(ISO7021F) options

•Robust electromagnetic compatibility (EMC)

–System-level ESD, EFT, and surge immunity

–±8kV IEC 61000-4-2 contact discharge

protection across isolation barrier

–Very low emissions

•Safety-related certifications:

–DIN EN IEC 60747-17 (VDE 0884-17)

–UL 1577 Component Recognition Program

–IEC 62368-1, IEC 61010-1 and GB 4943.1

–IECEx (IEC 60079-0 & IEC 60079-11) and

ATEX (EN IEC60079-0 & EN 60079-11)

2 Applications

•4mA to 20mA loop powered field transmitters

•Factory automation and process automation

•Low-power GPIO, UART isolation

V

CC1

GND1

V

CC2

MCU

V

DD

DGND

Digital

Ground

ISO

Ground

Galvanic

Isolation Barrier

ISO7021

GND2

V

CC1

V

CC2

ADC

Simplified Application Schematic

3 Description

The ISO7021 device is an ultra-low power,

multichannel digital isolator that can be used to

isolate CMOS or LVCMOS digital I/Os. Each isolation

channel has a logic input and output buffer separated

by a double capacitive silicon dioxide (SiO

2

) insulation

barrier. Innovative edge based architecture combined

with an ON-OFF keying modulation scheme allows

these isolators to consume very-low power while

meeting 3000V

RMS

isolation rating per UL1577. The

per channel dynamic current consumption of the

device is under 120μA/Mbps and the per channel

static current consumption is 4.8μA at 3.3V, allowing

for use of the ISO7021 in both power and thermal

constrained system designs.

The device can operate as low as 1.71V, as high

as 5.5V , and is fully functional with different supply

voltages on each side of isolation barrier. The two-

channel isolator comes in a narrow body 8-SOIC

package with one forward and one reverse-direction

channel in a 8-SOIC package. The device has default

output high and low options. If the input power or

signal is lost, default output is high for the ISO7021

device without the suffix F and low for the ISO7021F

device with the F suffix. See the Device Functional

Modes section for more information.

Device Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

ISO7021SOIC (8-D)4.90mm × 6.00mm

(1)For more information, see Section 14.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

Data Rate (kbps)

Current per Channel (PA)

110100100040004000

2

10

100

400400

SLLS

Data Rate vs Power Consumption at 3.3V

ISO7021

SLLSFA0C – JULY 2019 – REVISED MAY 2024

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.

Product specificaties