February 2010
Application Note
AN-EVAL 2x8-ISO1H811G-1
Coreless Transformer Isolated
High Side Switch Evaluation Board
2 x 8 Channel 0.6A with ISO1H811G
Published by Infineon Technologies AG
http://www.infineon.com
Power Management & Drives
N e v e r
s t o p
t h i n k i n g
2 x 8 Channel 0,6A Evaluation Board with ISO1H811G
Table of Contents
Table of Contents .....................................................................2
Introduction...............................................................................3
Board Characteristics ..............................................................4
Functional Description ............................................................5
Connectors................................................................................8
Schematic..................................................................................9
PCB Layout and Assembly....................................................11
Bill of Material .........................................................................12
References ..............................................................................13
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Page 2 from 14
EVAL 2x8-ISO1H811G
V1.1
2 x 8 Channel 0,6A Evaluation Board with ISO1H811G
Introduction
Application
This Application Note describes a Demoboard with an isolated 2 x 8 Channel 0.6A Digital Output. The
®
board is designed to show the performance of the ISOFACE Part
ISO1H811G
providing an Isolated
Interface output to drive resistive, capacitive or inductive loads directly. The input can be driven by
applying 3.3V/5V CMOS compatible signals to connector K3 or using the On-Board DIP switches S1
and S2. The input operates in Micro Controller Mode by using Chip Select and Write Signals or in
Direct Control Mode by pulling these signals to GND and setting the Data Input D0 to D7. The Output
consists of 2 times 8 Channel High Side Switches with 0.6A Current rating. The Output is protected
with a channel selected over-temperature switch (to off).
Typical Application
ISO1H811G
The
ISO1H811G
is a galvanic isolated 8-bit data interface in P-DSO-36 package that provides 8 fully
protected high-side power switches that are able to handle currents up to 625 mA.
An 8-bit parallel microcontroller (µC) compatible interface allows connecting the IC directly to a µC
system. The input interface also supports a direct control mode and is designed to operate with
3.3V/5V CMOS compatible levels. The data transfer from input to output side is realized by the
integrated Coreless Transformer Technology.
The ISOface™
ISO1H811G
includes 8 high-side power switches that are controlled by means of the
integrated parallel interface. The interface is 8-bit µC compatible. Furthermore, a direct control mode
can be selected that allows the direct control of the outputs OUT0...OUT7 by means of the inputs
®
D0...D7 without any additional logic signal. The ISOFACE can replace 8 optocouplers and the 8 high-
side switches in conventional I/O-Applications as galvanic isolation is implemented by means of the
integrated coreless transformer technology. The µC compatible interface allows a direct connection to
the ports of a microcontroller without the need for other components. Each of the 8 high-side power
switches is protected against short to Vbb, overload, over-temperature and against over-voltage by an
active zener clamp.
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Page 3 from 14
EVAL 2x8-ISO1H811G
V1.1
2 x 8 Channel 0,6A Evaluation Board with ISO1H811G
The diagnostic logic on the power chip recognizes the over-temperature information of each power
transistor. That information is sent via the internal coreless transformer to the pin DIAG at the input
interface.
Figure 1–
EVAL 2x8-ISO1H811G
Board Characteristics
Parameter
VCC Input Voltage
VBB Input Voltage
Input Signals
Output Current Limit
Output Clamping Voltage
Min.
3.0
8
11
-0.3
0.7xVCC
0.7
47
Max
5.5
12
45
0.3xVCC
VCC+0.3V
1.9
60
Unit
V
V
V
V
V
A
V
low level
high level
Remarks
K4 Jumper 1-2
K4 Jumper 2-3
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Page 4 from 14
EVAL 2x8-ISO1H811G
V1.1
2 x 8 Channel 0,6A Evaluation Board with ISO1H811G
Functional Description
Power Supply
The Demo Board contains 2 galvanic isolated voltage domains that are independent from each other.
The input interface is supplied by Pin1 and Pin14 of K3. Jumper K4 selects either direct supply with
3.3V/5V VCC (Jumper 1-2) or using the on-board 5V voltage regulator (Jumper 2-3). The output stage
is supplied at pin1 and 10 of K2, and K2 with Vbb voltage. The different voltage domains can be
switched on at different times. The output stage is only enabled once the input stage enters a stable
state.
Parallel Interface
The ISO1H811G contains a parallel interface that can be directly controlled by the microcontroller
output signals. The parallel interface can also be switched over to a direct control that allows direct
changes of the outputs OUT0 ... OUT7 by means of the corresponding inputs D0 ... D7 on the Demo
Board without additional logic signals. To activate the parallel direct control mode, both the /CS pin
and /WR pin must be connected to ground.
Direct Control Mode
Beside the use of the parallel µC compatible
interface, a parallel direct control mode can be
chosen. In this mode, the output OUT0...OUT7 can
be directly controlled via the inputs D0...D7 without
the need for additional logic signals. To activate this
mode, pin CS and WR must be connected to ground.
To activate the parallel direct control mode, both pins
/CS and /WR must be connected to ground.
On the Demo Board, this Mode can be easily
operated by using the DIP Switches S1 and S2.
VCC
VCC
VCC
CS
WR
P0
P1
P2
P3
P4
P5
P6
P7
GND
Controller
D0
D1
D2
D3
D4
D5
D6
D7
DIAG
Parallel Interface
Output
lines
GNDCC
IC1
Truth Table for manual DIP-switch control:
Input
/DIS
Direct Control Mode
Output Disabled
H
H
L
/WRx
L
L
X
/CS
L
L
X
Output
Dn
H
L
X
OUTn
ON
OFF
OFF
H = High Voltage Level; L = Low Voltage Level; X = Don’t Care;
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Page 5 from 14
EVAL 2x8-ISO1H811G
V1.1
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