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LTC6820 Datasheet

isoSPI Isolated Communications Interface

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LTC6820
isoSPI Isolated
Communications Interface
Features
Description
n 1Mbps Isolated SPI Data Communications
n Simple Galvanic Isolation Using Standard
Transformers
n Bidirectional Interface Over a Single Twisted Pair
n Supports Cable Lengths Up to 100 Meters
n Very Low EMI Susceptibility and Emissions
n Configurable for High Noise Immunity or Low Power
n Engineered for ISO26262 Compliant Systems
n Requires No Software Changes in Most SPI Systems
n Ultralow, 2µA Idle Current
n Automatic Wake-Up Detection
n Operating Temperature Range: –40°C to 125°C
n 2.7V to 5.5V Power Supply
n Interfaces to All Logic from 1.7V to 5.5V
n Available in 16-Lead QFN and MSOP Packages
Applications
n Industrial Networking
n Battery Monitoring Systems
n Remote Sensors
The LTC®6820 provides bidirectional SPI communications
between two isolated devices through a single twisted-
pair connection. Each LTC6820 encodes logic states into
signals that are transmitted across an isolation barrier to
another LTC6820. The receiving LTC6820 decodes the
transmission and drives the slave bus to the appropriate
logic states. The isolation barrier can be bridged by a simple
pulse transformer to achieve hundreds of volts of isolation.
The LTC6820 drives differential signals using matched
source and sink currents, eliminating the requirement
for a transformer center tap and reducing EMI. Precision
window comparators in the receiver detect the differential
signals. The drive currents and the comparator thresholds
are set by a simple external resistor divider, allowing the
system to be optimized for required cable lengths and
desired signal-to-noise performance.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and isoSPI
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Patents pending.
Typical Application
Microcontroller to SPI Slave Isolated Interface
MASTER
µC
SDO
SDI
SCK
CS
LTC6820
MSTR
MOSI IP
MISO
SCK IM
CS
120Ω
REMOTE
SLAVE IC
SDI
SDO
SCK
CS
LTC6820
MSTR
IP
MOSI
MISO
SCK IM
CS
100 METERS
TWISTED PAIR
120Ω
6820 TA01a
Data Rate vs Cable Length
1.2
CAT-5 ASSUMED
1.0
0.8
0.6
0.4
0.2
0
1 10 100
CABLE LENGTH (METERS)
6820 TA01b
For more information www.linear.com/LTC6820
6820fa
1


Linear Technology Electronic Components Datasheet

LTC6820 Datasheet

isoSPI Isolated Communications Interface

No Preview Available !

LTC6820
Absolute Maximum Ratings (Notes 1, 2, 3)
Input Supply Voltages (VDD and VDDS) to GND............6V
Pin Voltages
SCK, CS, EN................–0.3V to VDDS + 0.3V (6V Max)
IBIAS, SLOW, IP, IM......–0.3V to VDD + 0.3V (6V Max)
All Other Pin Voltages............................... –0.3V to 6V
Maximum Source/Sink Current
IP, IM..................................................................30mA
MOSI, MISO, SCK, CS.........................................20mA
Operating Temperature Range
LTC6820I..............................................–40°C to 85°C
LTC6820H........................................... –40°C to 125°C
Specified Temperature Range
LTC6820I..............................................–40°C to 85°C
LTC6820H........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP................................................................ 300°C
Pin Configuration
TOP VIEW
MOSI 1
MISO 2
SCK 3
CS 4
16 15 14 13
12
17 11
10
9
5678
SLOW
MSTR
IP
IM
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 150°C, θJA = 58.7°C/W
EXPOSED PAD (PIN 17) PCB CONNECTION TO GND IS OPTIONAL
TOP VIEW
EN 1
MOSI 2
MISO 3
SCK 4
CS 5
VPDODLS
6
7
PHA 8
16 IBIAS
15 ICMP
14 GND
13 SLOW
12 MSTR
11 IP
10 IM
9 VDD
MS PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LTC6820IUD#PBF
LTC6820IUD#TRPBF
LGFM
16-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
LTC6820HUD#PBF
LTC6820HUD#TRPBF LGFM
16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC6820IMS#PBF
LTC6820IMS#TRPBF
6820
16-Lead Plastic MSOP
–40°C to 85°C
LTC6820HMS#PBF
LTC6820HMS#TRPBF 6820
16-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
6820fa
2 For more information www.linear.com/LTC6820


Part Number LTC6820
Description isoSPI Isolated Communications Interface
Maker Linear
Total Page 30 Pages
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