LTM2892 Datasheet PDF - Linear Technology
| Part Number | LTM2892 | |
| Description | SPI/Digital or I2C uModule Isolator | |
| Manufacturers | Linear Technology | |
| Logo |  |
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LTM2892
SPI/Digital or I2C
µModule Isolator
Features
n 6-Channel Logic Isolator: 3500VRMS for 1 Minute
n 3V to 5.5V Supply Operation
n No External Components Required
n SPI/Digital (LTM2892-S) or I2C (LTM2892-I) Options
n High Common Mode Transient Immunity: 50kV/μs
n High Speed Operation:
10MHz Digital Isolation
4MHz/8MHz SPI Isolation
400kHz I2C Isolation
n Operation Up to 125°C (H-Grade)
n 1.62V to 5.5V Logic Supplies for Flexible Digital
Interfacing
n ±15kV ESD HBM Across the Isolation Barrier
n Maximum Continuous Working Voltage: 850VPEAK
n Low Current Shutdown Mode (<10µA)
n Small (9mm × 6.25mm × 2.91mm) BGA Package
Applications
n Isolated SPI or I2C Interfaces
n Industrial Systems
n Test and Measurement Equipment
n Breaking Ground Loops
Description
The LTM®2892 is a complete galvanic digital µModule®
(micromodule) isolator. No external components are re-
quired. Individual 3V to 5.5V supplies power each side of
the digital isolator. Separate logic supply pins allow easy
interfacing with different logic levels from 1.62V to 5.5V,
independent of the main supply.
Module options are available with compatibility to SPI
(LTM2892-S) and I2C (LTM2892-I), master mode only,
specifications.
Coupled inductors provide 3500VRMS of isolation between
the input and output logic interface. This device is ideal
for systems where the ground loop is broken, allowing
uninterrupted communication through large common
mode transients faster than 50kV/μs.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and HotSwap is a trademark of of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
Isolated 4MHz SPI Interface
3V TO 5.5V
SCK
MOSI
SS
MISO
VCC1
VL1
ON1
EOUTD
INA
INB
INC
LTM2892-S
OUTD
OUTE
OUTF
VCC2
VL2
ON2
EOUTA
OUTA
OUTB
OUTC
IND
INE
INF
3V TO 5.5V
SCK
MOSI
SS
MISO
GND1
GND2
2892 TA01a
LTM2892 Operating Through 50kV/µs CM Transients
5V/DIV
5V/DIV
INA
OUTD
200V/
DIV
20ns/DIV
OUTA CONNECTED TO IND
GND2-GND1
2892 TA01b
For more information www.linear.com/LTM2892
2892f
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LTM2892
S witching Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC1 = 5V, VCC2 = 5V, VL1 = 3.3V, VL2 = 3.3V, GND1 = GND2 = 0V,
ON1 = VL1, and ON2 = VL2 unless otherwise noted. Specifications apply to all options unless otherwise noted.
SYMBOL
I2C
PARAMETER
CONDITIONS
MIN TYP MAX
Maximum Data Rate
(Note 3)
l 400
tPHL, tPLH
tR
tF
tPWU
tPZH, tPZL
tPHZ, tPLZ
tSP
Propagation Delay
SCLIN → SCLOUT, CL = 15pF (Figure 1)
SDA1
SDA2
→
→
SDA2,
SDA1,
RRLL
=
=
1O.p1ekn, ,CCLL==1155ppFF(F(Figiguurere33))
l
l
l
150 225
150 250
200 350
Rise Time
SDA2,
SDA2,
CCLL
=
=
200pF
200pF
(Figure
(Figure
3)
3)
SDA1, RL = 1.1k, CL = 200pF (Figure 3)
SCLOUT, CL = 200pF (Figure 3)
l 40
40
l 40
l
300
250
250
250
Fall Time
SDA2, CL = 200pF (Figure 3)
SDA1, RL = 1.1k, CL = 200pF (Figure 3)
SCLOUT, CL = 200pF (Figure 3)
l 40
l 40
l
250
250
250
Output Pulse Width Uncertainty SDA1, SDA2 (Note 2)
–20 50
ONx Enable Time
ONx Disable Time
Pulse Width of Spikes
Suppressed by Input Filter
ON1 = ↑ to SDA1, RL = 1k, CL = 15pF (Figure 4)
ON2 = ↑ to (SCLOUT, SDA2), CL = 15pF (Figure 4)
ON1 = ↓ to SDA1, RL = 1k, CL = 15pF (Figure 4)
ON2
ON2
=
=
↓
↓
to
to
SSDCLAO2,URT,LR=L
= 1k,
Open,
CCLL==1155ppFF((FFiigguurree44))
l
l
l
l
l
l
0
60
50
50
225
50
UNITS
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
μs
ns
ns
ns
ns
Isolation Characteristics TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
VISO
Rated Dielectric Insulation Voltage
1 Minute, Derived from 1 Second Test
1 Second (Notes 5, 6)
VIORM
Common Mode Transient Immunity
Maximum Continuous Working
Voltage
VVCCCM1==1VkLV1, ∆=tO=N210=ns5V(,NVoCteC22)= VL2 = ON2 = 5V
(Notes 2, 5)
Partial Discharge
VPD = 1590VPEAK (Note 5)
CTI
Comparative Tracking Index
IEC 60112 (Note 2)
Depth of Erosion
IEC 60112 (Note 2)
DTI
Distance Through Insulation
(Note 2)
Input to Output Resistance
(Notes 2, 5)
Input to Output Capacitance
(Notes 2, 5)
Creepage Distance
(Note 2)
MIN TYP MAX
3500
4200
50
850
600
5
600
0.1
0.1
1012
3
5
UNITS
VVRRMMSS
kV/µs
VPEAK
VRMS
pC
VRMS
mm
mm
Ω
pF
mm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Guaranteed by design and not subject to production test.
Note 3: Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4: This µModule isolator includes overtemperature protection that
is intended to protect the device during momentary overload conditions.
Junction temperature will exceed 125°C when overtemperature protection
is active. Continuous operation above specified maximum operating
junction temperature may result in device degradation or failure.
Note 5: Device is considered a 2-terminal device. Pin group A1 through B6
shorted together and pin group H1 through J6 shorted together.
Note 6: The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
2892f
For more information www.linear.com/LTM2892
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| Information | Total 30 Pages | |
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| Download | [ LTM2892.PDF Datasheet ] | |
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