LTM2887
2
SPI/Digital or I C Module
Isolator with Dual Adjustable
5V Regulators
FEATURES DESCRIPTION
n
6-Channel Logic Isolator: 2500V for 1 Minute The LTM 2887 is a complete galvanic digital Module
RMS
n
UL-CSA Recognized File #E151738 (micromodule) isolator. No external components are
n
Isolated DC Power: required. A single 3.3V or 5V supply powers both sides
n
1.8V to 5V Logic Supply at Up to 100mA of the interface through an integrated, isolated DC/DC
n
0.6V to 5V Auxiliary Supply at Up to 100mA converter. A logic supply pin allows easy interfacing with
n
No External Components Required different logic levels from 1.62V to 5.5V, independent of
2
n
SPI/Digital (LTM2887-S) or I C (LTM2887-I) Options the main supply.
n
High Common Mode Transient Immunity: 30kV/s
2
Available options are compliant with SPI and I C (master
n
High Speed Operation:
mode only) specifications.
n
10MHz Digital Isolation
n The isolated side includes two 5V nominal power supplies,
4MHz/8MHz SPI Isolation
2
n including programmable current limit, each capable of
400kHz I C Isolation
n providing more than 100mA of load current. The supplies
3.3V (LTM2887-3) or 5V (LTM2887-5) Operation
n may be adjusted from their nominal value using a single
1.62V to 5.5V Logic Supply
n external resistor.
10kV ESD HBM Across the Isolation Barrier
n
Maximum Continuous Working Voltage: 560V
PEAK
Coupled inductors and an isolation power transformer
n
Low Current Shutdown Mode (<10A)
provide 2500V of isolation between the input and out-
RMS
n
Low Profile 15mm 11.25mm 3.42mm BGA Package
put logic interface. This device is ideal for systems where
the ground loop is broken, allowing for a large common
APPLICATIONS
mode voltage range. Communication is uninterrupted for
2
n
Isolated SPI or I C Interfaces
common mode transients greater than 30kV/s.
n
Industrial Systems
L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of
Analog Devices, Inc. All other trademarks are the property of their respective owners.
n
Test and Measurement Equipment
n
Breaking Ground Loops
TYPICAL APPLICATION
Isolated 4MHz SPI Interface LTM2887 Operating Through 50kV/s CM Transients
LTM2887-5S
SCK
V
CC2
5V AT 100mA SD0
V
CC
AV
5V CC2
SCK2 = SD02
5V/DIV
1.15k
IV
V CC2
L
V
L2
ON
3.3V AT 100mA
AV
L2
IV 27.4k REPETITIVE
L2
COMMON MODE
1.15k
TRANSIENTS
SDOE
GND2 TO GND
CS CS2
6.04k
CS CS
SDI SDI2
SDI SDI
SCK SCK2
SCK SCK
200V/DIV
2887 TA01b
DO2 I2 20ns/DIV
SDO SDO2
SDO SDO
DO1 I1
GND GND2
2887 TA01a
2887fb
1
For more information www.linear.com/LTM2887
ISOLATION BARRIERLTM2887
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V to GND .................................................. 0.3V to 6V Logic Outputs
CC
V to GND .................................................... 0.3V to 6V DO1, DO2, SDO to GND ..............0.3V to (V + 0.3V)
L L
V , AV , IV to GND2......................... 0.3V to 6V O1, SCK2, SDI2, CS2,
CC2 CC2 CC2
V , AV , IV to GND2 .............................. 0.3V to 6V SCL2 to GND2 ..........................0.3V to (V + 0.3V)
L2 L2 L2 L2
Logic Inputs Operating Temperature Range (Note 4)
DI1, SCK, SDI, CS, SCL, SDA, SDOE, LTM2887C ............................................... 0C to 70C
ON to GND ..................................0.3V to (V + 0.3V) LTM2887I ............................................40C to 85C
L
I1, I2, SDA2, LTM2887H ......................................... 40C to 125C
SDO2 to GND2 ..........................0.3V to (V + 0.3V) Maximum Internal Operating Temperature ............ 125C
L2
Storage Temperature Range .................. 55C to 125C
Peak Body Reflow Temperature ............................ 245C
PIN CONFIGURATION
LTM2887-I LTM2887-S
TOP VIEW TOP VIEW
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
DO2 DNC SCL SDA DI1 GND ON V SDO DO2 SCK SDI CS SDOE ON V
L L
A A
B B
DO1 GND V DO1 GND V
CC CC
C C
D D
E E
F F
G G
H H
J J
I1 GND2 AV IV AV I1 GND2 AV IV AV
L2 L2 CC2 L2 L2 CC2
K K
L L
I2 DNC SCL2 SDA2 O1 V IV V SDO2 I2 SCK2 SDI2 CS2 V IV V
L2 CC2 CC2 L2 CC2 CC2
BGA PACKAGE BGA PACKAGE
32-PIN (15mm 11.25mm 3.42mm) 32-PIN (15mm 11.25mm 3.42mm)
T = 125C, = 23.9C/W, = 8.1C/W, T = 125C, = 23.9C/W, = 8.1C/W,
JMAX JA JCbottom JMAX JA JCbottom
= 18.1C/W, = 9.3C/W = 18.1C/W, = 9.3C/W
JCtop JB JCtop JB
VALUES DETERMINED PER JESD51-9, WEIGHT = 1.2g VALUES DETERMINED PER JESD51-9, WEIGHT = 1.2g
2887fb
2
For more information www.linear.com/LTM2887