2 x 8 Channel 0,6A Evaluation Board with ISO1H811G
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V1.1
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.
Truth Table for manual DIP-switch control:
Input Output
/DIS /WRx /CS Dn OUTn
Direct Control Mode
H L L H ON
H L L L OFF
Output Disabled
L X X X OFF
H = High Voltage Level; L = Low Voltage Level; X = Don’t Care;
Parallel Interface
IC1
Output
lines
Controller
P0
P1
P2
P3
P4
P5
P6
P7
D0
D1
D2
D3
D4
D5
D6
D7
VCC
VCC
VCC
CS
WR
DIAG
GNDCCGND
