FEATURES
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LTM2887
SPI/Digital or I
2
C µModule
Isolator with Dual Adjustable
5V Regulators
DESCRIPTION
The
LTM
®
2887
is a complete galvanic digital µModule
®
(micromodule) isolator. No external components are
required. A single 3.3V or 5V supply powers both sides
of the interface through an integrated, isolated DC/DC
converter. A logic supply pin allows easy interfacing with
different logic levels from 1.62V to 5.5V, independent of
the main supply.
Available options are compliant with SPI and I
2
C (master
mode only) specifications.
The isolated side includes two 5V nominal power supplies,
including programmable current limit, each capable of
providing more than 100mA of load current. The supplies
may be adjusted from their nominal value using a single
external resistor.
Coupled inductors and an isolation power transformer
provide 2500V
RMS
of isolation between the input and out-
put logic interface. This device is ideal for systems where
the ground loop is broken, allowing for a large common
mode voltage range. Communication is uninterrupted for
common mode transients greater than 30kV/μs.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Analog Devices, Inc. All other trademarks are the property of their respective owners.
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6-Channel Logic Isolator: 2500V
RMS
for 1 Minute
UL-CSA Recognized
File #E151738
Isolated DC Power:
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1.8V to 5V Logic Supply at Up to 100mA
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0.6V to 5V Auxiliary Supply at Up to 100mA
No External Components Required
SPI/Digital (LTM2887-S) or I
2
C (LTM2887-I) Options
High Common Mode Transient Immunity: 30kV/μs
High Speed Operation:
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10MHz Digital Isolation
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4MHz/8MHz SPI Isolation
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400kHz I
2
C Isolation
3.3V (LTM2887-3) or 5V (LTM2887-5) Operation
1.62V to 5.5V Logic Supply
±10kV ESD HBM Across the Isolation Barrier
Maximum Continuous Working Voltage: 560V
PEAK
Low Current Shutdown Mode (<10µA)
Low Profile 15mm × 11.25mm × 3.42mm BGA Package
Isolated SPI or I
2
C Interfaces
Industrial Systems
Test and Measurement Equipment
Breaking Ground Loops
APPLICATIONS
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TYPICAL APPLICATION
Isolated 4MHz SPI Interface
LTM2887-5S
5V
V
CC
V
L
ON
ISOLATION BARRIER
V
CC2
AV
CC2
IV
CC2
V
L2
AV
L2
IV
L2
1.15k
CS2
SDI2
SCK2
I2
SDO2
I1
GND2
2887 TA01a
LTM2887 Operating Through 50kV/µs CM Transients
5V AT 100mA
SCK
SD0
SCK2 = SD02
1.15k
3.3V AT 100mA
27.4k
5V/DIV
SDOE
CS
SDI
SCK
CS
SDI
SCK
DO2
SDO
SDO
DO1
GND
REPETITIVE
COMMON MODE
TRANSIENTS
GND2 TO GND
CS
SDI
SCK
6.04k
200V/DIV
20ns/DIV
2887 TA01b
SDO
2887fb
For more information
www.linear.com/LTM2887
1
LTM2887
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
CC
to GND .................................................. –0.3V to 6V
V
L
to GND .................................................... –0.3V to 6V
V
CC2
, AV
CC2
, IV
CC2
to GND2......................... –0.3V to 6V
V
L2
, AV
L2
, IV
L2
to GND2 .............................. –0.3V to 6V
Logic Inputs
DI1, SCK, SDI,
CS,
SCL, SDA,
SDOE,
ON to GND ..................................–0.3V to (V
L
+ 0.3V)
I1, I2, SDA2,
SDO2 to GND2 ..........................–0.3V to (V
L2
+ 0.3V)
Logic Outputs
DO1, DO2, SDO to GND ..............–0.3V to (V
L
+ 0.3V)
O1, SCK2, SDI2,
CS2,
SCL2 to GND2 ..........................–0.3V to (V
L2
+ 0.3V)
Operating Temperature Range (Note 4)
LTM2887C ............................................... 0°C to 70°C
LTM2887I ............................................–40°C to 85°C
LTM2887H ......................................... –40°C to 125°C
Maximum Internal Operating Temperature............ 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Body Reflow Temperature ............................ 245°C
PIN CONFIGURATION
LTM2887-I
1
A
B
C
D
E
F
G
H
J
K
L
I2
DNC SCL2 SDA2 O1
V
L2
IV
CC2
V
CC2
I1
GND2
AV
L2
IV
L2
AV
CC2
DO1
GND
V
CC
2
3
TOP VIEW
4
5
DI1
6
GND
7
ON
8
V
L
A
B
C
D
E
F
G
H
J
K
L
SDO2
I2
SCK2 SDI2
CS2
V
L2
IV
CC2
V
CC2
I1
GND2
AV
L2
IV
L2
AV
CC2
DO1
GND
V
CC
DO2 DNC SCL SDA
LTM2887-S
1
2
3
TOP VIEW
4
SDI
5
6
7
8
V
L
SDO DO2 SCK
CS SDOE
ON
BGA PACKAGE
32-PIN (15mm
×
11.25mm
×
3.42mm)
T
JMAX
= 125°C,
θ
JA
= 23.9°C/W,
θ
JCbottom
= 8.1°C/W,
θ
JCtop
= 18.1°C/W,
θ
JB
= 9.3°C/W
θ
VALUES DETERMINED PER JESD51-9, WEIGHT = 1.2g
BGA PACKAGE
32-PIN (15mm
×
11.25mm
×
3.42mm)
T
JMAX
= 125°C,
θ
JA
= 23.9°C/W,
θ
JCbottom
= 8.1°C/W,
θ
JCtop
= 18.1°C/W,
θ
JB
= 9.3°C/W
θ
VALUES DETERMINED PER JESD51-9, WEIGHT = 1.2g
2887fb
2
For more information
www.linear.com/LTM2887
LTM2887
PRODUCT SELECTION GUIDE
LTM2887 C
Y
-3
I
#PBF
LEAD FREE DESIGNATOR
PBF = Lead Free
LOGIC OPTION
I = Inter-IC (I
2
C) Bus
S = Serial Peripheral Interface (SPI) Bus
INPUT VOLTAGE RANGE
3 = 3V to 3.6V
5 = 4.5V to 5.5V
PACKAGE TYPE
Y = Ball Grid Array (BGA)
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
PRODUCT PART NUMBER
ORDER INFORMATION
PART NUMBER
LTM2887CY-3I#PBF
LTM2887IY-3I#PBF
LTM2887HY-3I#PBF
LTM2887CY-3S#PBF
LTM2887IY-3S#PBF
LTM2887HY-3S#PBF
LTM2887CY-5I#PBF
LTM2887IY-5I#PBF
LTM2887HY-5I#PBF
LTM2887CY-5S#PBF
LTM2887IY-5S#PBF
LTM2887HY-5S#PBF
SAC305 (RoHS)
PAD OR BALL
FINISH
http://www.linear.com/product/LTM2887#orderinfo
PART MARKING
PACKAGE
TYPE
MSL INPUT VOLTAGE
RATING RANGE
LOGIC
OPTION
I
2
C
3V to 3.6V
TEMPERATURE
RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
SPI
e1
BGA
3
I
2
C
4.5V to 5.5V
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
SPI
–40°C to 85°C
–40°C to 125°C
• Recommended BGA PCB Assembly and Manufacturing Procedures:
www.linear.com/BGA-assy
• BGA Package and Tray Drawings:
www.linear.com/packaging
• This product is moisture sensitive. For more information, go to:
www.linear.com/BGA-assy
DEVICE
LTM2887Y-3I
FINISH CODE
LTM2887Y-3S
LTM2887Y-5I
LTM2887Y-5S
• Device temperature grade is indicated by a label on the
shipping container.
• Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Marking:
www.linear.com/leadfree
• This product is not recommended for second side reflow. For
more information, go to
www.linear.com/BGA-assy
2887fb
For more information
www.linear.com/LTM2887
3
LTM2887
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Input Supplies
V
CC
V
L
I
CC
Input Supply Range
Logic Supply Range
Input Supply Current
LTM2887-3
LTM2887-5
LTM2887-S
LTM2887-I
ON = 0V
LTM2887-3, ON = V
L
, No Load
LTM2887-5, ON = V
L
, No Load
ON = 0V
LTM2887-S, ON = V
L
LTM2887-I, ON = V
L
No Load, AV
CC2
Open
(Note 2)
I
LOAD
= 1mA, MIN ≤ V
CC
≤ MAX
I
LOAD
= 1mA to 100mA
I
LOAD
= 1mA to 100mA
I
LOAD
= 100mA (Note 2)
LTM2887-5, I
LOAD
= 100mA (Note 2)
V
CC2
= 0V, IV
CC2
= 0V
ΔV
CC2
= –5%, IV
CC2
= 0V
V
CC2
= 5V, R(IV
CC2
to GND2) = 2.26k
V
CC2
= 5V, R(IV
CC2
to GND2) = 1.5k
V
CC2
= 5V, R(IV
CC2
to GND2) = 1.15k
No Load, AV
L2
Open
LTM2887-I (Note 2)
LTM2887-S (Note 2)
I
LOAD
= 1mA, MIN ≤ V
CC
≤ MAX
I
LOAD
= 1mA to 100mA
I
LOAD
= 1mA to 100mA
I
LOAD
= 100mA (Note 2)
LTM2887-5, I
LOAD
= 100mA (Note 2)
V
L2
= 0V, IV
L2
= 0V
ΔV
L2
= –5%, IV
L2
= 0V
V
L2
= 5V, R(IV
L2
to GND2) = 2.26k
V
L2
= 5V, R(IV
L2
to GND2) = 1.5k
V
L2
= 5V, R(IV
L2
to GND2) = 1.15k
ON, DI1,
SDOE,
SCK, SDI,
CS
1.62V ≤ V
L
< 2.35V
ON, DI1,
SDOE,
SCK, SDI,
CS
2.35V ≤ V
L
I1, I2, SDO2
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
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l
l
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The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2887-3 V
CC
= 3.3V, LTM2887-5 V
CC
= 5V, V
L
= 3.3V, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted. Specifications apply to all options unless otherwise noted.
CONDITIONS
MIN
3
4.5
1.62
3
TYP
3.3
5
5
0
25
19
0
10
MAX
3.6
5.5
5.5
5.5
10
30
25
10
150
5.25
5.5
1
45
540
580
1
62
200
100
49
71
91
4.75
3
1.8
0.25
25
540
580
1
62
200
100
49
71
91
0.25 • V
L
0.33 • V
L
0.33 • V
L2
53
79
103
57
87
115
0.75 • V
L
0.67 • V
L
0.67 • V
L2
±1
53
79
103
5
57
87
115
5.25
5.5
5.5
3
100
620
6
150
620
UNITS
V
V
V
V
µA
mA
mA
µA
µA
µA
V
V
mV
mV
mV
mV
RMS
%
mA
mA
mA
mA
mA
V
V
V
mV
mV
mV
mV
RMS
%
mA
mA
mA
mA
mA
V
V
V
µA
I
L
Logic Supply Current
Output Supplies
V
CC2
Regulated Output Voltage
Output Voltage Operating Range
Line Regulation
Load Regulation
ADJ Pin Voltage
Voltage Ripple
Efficiency
I
CC2
Output Short Circuit Current
Internal Current Limit
External Programmed Current
Limit
V
L2
Regulated Output Voltage
Output Voltage Operating Range
Line Regulation
Load Regulation
ADJ Pin Voltage
Voltage Ripple
Efficiency
I
L2
Output Short Circuit Current
Current Limit
External Programmed Current
Limit
Logic/SPI
V
ITH
Input Threshold Voltage
l
l
l
l
l
4.75
0.6
5
I
INL
Input Current
2887fb
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For more information
www.linear.com/LTM2887
LTM2887
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
HYS
V
OH
Input Hysteresis
Output High Voltage
DO1, DO2, SDO
I
LOAD
= –1mA, 1.62V ≤ V
L
< 3V
I
LOAD
= –4mA, 3V ≤ V
L
≤ 5.5V
O1, SCK2, SDI2,
CS2,
I
LOAD
= –4mA
V
OL
Output Low Voltage
DO1, DO2, SDO
I
LOAD
= 1mA, 1.62V ≤ V
L
< 3V
I
LOAD
= 4mA, 3V ≤ V
L
≤ 5.5V
O1, SCK2, SDI2,
CS2,
I
LOAD
= 4mA
I
SC
I
2
C
V
IL
V
IH
I
INL
V
HYS
V
OH
V
OL
Low Level Input Voltage
High Level Input Voltage
Input Current
Input Hysteresis
Output High Voltage
Output Low Voltage
SCL, SDA
SDA2
SCL, SDA
SDA2
SCL, SDA = V
L
or 0V
SDA2 = V
L2
, SDA2 = V
L2
= 0V
SCL, SDA
SDA2
SCL2, I
LOAD
= –2mA
DO2, I
LOAD
= –2mA
SDA, I
LOAD
= 3mA
DO2, I
LOAD
= 2mA
SCL2, I
LOAD
= 2mA
SDA2, No Load, SDA = 0V, 4.5V ≤ V
L2
< 5.5V
SDA2, No Load, SDA = 0V, 3V < V
L2
< 4.5V
SCL, SDA, SDA2 (Note 2)
SCL2, Standard Speed (Note 2)
SCL2, Fast Speed
SDA, SDA2, SR ≥ 1V/µs, Standard Speed (Note 2)
SDA, SDA2, SR ≥ 1V/µs, Fast Speed
SDA, SDA2
SDA2 = 0, SDA = V
L
0V ≤ SCL2 ≤ V
L2
0V ≤ DO2 ≤ V
L
SDA = 0, SDA2 = V
L2
SDA = V
L
, SDA2 = 0
(V
CC2
, V
L2
, GND2) to (V
CC
, V
L
, GND)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2887-3 V
CC
= 3.3V, LTM2887-5 V
CC
= 5V, V
L
= 3.3V, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted. Specifications apply to all options unless otherwise noted.
CONDITIONS
MIN
V
L
– 0.4
TYP
150
MAX
UNITS
mV
V
l
l
V
L2
– 0.4
0.4
V
V
l
l
0.4
±60
±85
V
mA
mA
V
V
V
V
Short-Circuit Current
0V ≤ (DO1, DO2, SDO) ≤ V
L
0V ≤ (O1, SCK2, SDI2,
CS2)
≤ V
L2
0.3 • V
L
0.3 • V
L2
0.7 • V
L
0.7 • V
L2
±1
±1
0.05 • V
L
0.05 • V
L2
V
L2
– 0.4
V
L
– 0.4
0.4
0.4
0.4
0.45
0.55
10
400
200
400
200
1
±30
±30
6
–1.8
±10
100
µA
µA
mV
mV
V
V
V
V
V
V
V
pF
pF
pF
pF
pF
V/µs
mA
mA
mA
mA
mA
kV
0.3
C
IN
C
B
Input Pin Capacitance
Bus Capacitive Load
Minimum Bus Slew Rate
I
SC
Short-Circuit Current
ESD (HBM) (Note 2)
Isolation Boundary
2887fb
For more information
www.linear.com/LTM2887
5
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