User Guide 096
UG096.1
February 24, 2017
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3
Logic Control
The ISL72813SEH IC has six logic control input pins; A0 - A4 (Pins
19 - 23) and EN (Pin 25).
The Logic 1 V
IH
level for the logic pins is from 2.0V to VCC. The
Logic 0 V
IL
level is from 0.8V to 0V. The V
CC
voltage can be 3.0V
to 5.5V.
The A0 - A4 digital input pins select between the 32 current
driver circuit channels per the truth table on page 5 of the
ISL72813SEH
datasheet. The selected channel is activated when
the EN pin is HIGH (Logic 1).
The EN digital input enables and disables the current driver
channels. When EN = LOW (Logic 0) all channels are deactivated
(OFF). When EN = HIGH (Logic 1) then the channel selected by
the logic levels at A0 - A4 is activated (ON).
Test Points
The board has various test points for ease of connecting probes
to make measurements. The test points available are described
in
Table 1
.
TABLE 1. TEST POINTS
DESIGNATOR
DESCRIPTION
PG1 - PG4
Ground test point
PA0
A0 logic input test point
PA1
A1 logic input test point
PA2
A2 logic input test point
PA3
A3 logic input test point
PA4
A4 logic input test point
PEN
EN logic input test point
PC0 - PC31
Open collector output test points
TABLE 2. BOARD COMPONENT DEFINITIONS
DESIGNATOR
DESCRIPTION
U1
ISL72813SEHL/PROTO CLCC IC
VCC
VCC power supply connection (5V
DC
)
GND
Ground connection
VEE
Common emitter supply connection (-34V
DC
)
SW0 A0
Toggle switch for logic input A0
SW1 A1
Toggle switch for logic input A1
SW2 A2
Toggle switch for logic input A2
SW3 A3
Toggle switch for logic input A3
SW4 A4
Toggle switch for logic input A4
SW5 EN
Toggle switch for logic input EN
CO - C31
Open collector outputs load connections or test points
LED0 - LED31
LEDs for quick functional testing of the ISL72813SEH IC
R0 - R31
Load resistor for the LEDs
D0 - D31
Schottky diode across the LED circuitry to clamp positive transients during switching between channels
J0 - J31
Jumpers to connect LED circuitry to the open collector channel
