IC-JX Datasheet, PDF (2/36 Pages) IC-Haus GmbH – 16-FOLD 24 V HIGH-SIDE DRIVER WITH μC INTERFACE

iC-JX
16-FOLD 24 V HIGH-SIDE DRIVER WITH µC INTERFACE
Rev C1, Page 2/36
DESCRIPTION
iC-JX is a bidirectional I/O device with 4x4 high-side
driver stages. The input or output function can be
separately selected for blocks or nibbles of four I/O
stages.
Each block can also be individually programmed with
various filtering options for the debouncing of I/O
pin signals or overcurrent messages, with current
sources for the defining of levels at the inputs (low-
side sources) or for load diagnosis at the outputs
(high-side sources) and also with a flash pulse func-
tion.
To enable communication with the controller the de-
vice includes a parallel interface (with eight data, five
address and three control pins) and also an SPI-
compatible serial interface (with one pin for the clock,
chip selection, data input and data output respec-
tively). The type of interface is selected via pin NSP.
I/O stages with an input function can record logic
levels at 24 V where a programmable pull-down cur-
rent source (of up to 2 mA) either defines the level
for open inputs or supplies a bias current for exter-
nal switch contacts. Connecting safety circuits with
integrated serial/parallel resistors to the device also
enables leakage currents and short circuits to be pin-
pointed. The contact status can be read out using the
microcontroller interface.
I/O stages with an output function drive various loads
(such as lamps, cables or relays, for example) to a
common ground with 150 mA of permanent current
or 500 mA in pulse operation. Spikes and flyback
currents are discharged by the integrated flyback cir-
cuits.
For synchronous flash display, as used for indicator
lamps in plugboards, for example, a flash pulse en-
able can be individually set for each output to offload
the controller. A common inhibiting input (POE) per-
mits the global shutdown of all outputs and can be
operated by an autonomous watchdog circuit.
and generates interrupt messages for the controller.
The latter is warned before the device is forcibly shut-
down. A short circuit also triggers an interrupt mes-
sage; the current status here can be read out by the
controller.
For the purpose of load diagnosis a programmable
pull-up current source (of up to 2 mA) can be used
to determine an initial load breakage or open loop
(caused by a fractured cable, for example) before
an output is switched on. The I/O pin status can
always be read back via comparators. A load cur-
rent measurement circuit then permits the load to be
assessed; failed valves and faulty or wrongly imple-
mented indicator lamps can be verified in this way. In
addition, the analog measurement of voltage at the
I/O pins allows safety switches to be analyzed with
reference to ground, here without the driver function.
All analog measurements for the load current (per
stage), for the I/O pin voltage (per stage, either refer-
enced to Ground or VB), for the driver supply (all VB
pins) , for the internal voltage reference (VBG) and
for the chip temperature are made available to the
microcontroller as digital measurements by an inte-
grated A/D converter which has 10 bits of resolution.
An interrupt pipeline which limits the loss of interrupts
allows reliable processing of interrupts by the micro-
controller. Registers provide information as to current
events; messages can be individually enabled for all
available interrupt sources.
iC-JX monitors all supply voltages and also the
GNDD-GNDA connection to ground.
Monitored separately, undervoltage in the range of
2.5V at analog supply VCC or even short disruption
of digital supply VDD causes all registers to be reset
and the output stages to be shutdown.
Undervoltage at 24 V driver supply VB triggers a
shutdown of the output stages without deleting the
contents of the registers.
All output stages are short-circuit-proof and pro-
tected against thermal destruction in the event of ex-
treme power dissipation. Each stage has its own
temperature sensor which is evaluated in two stages
Diodes protect all inputs and outputs against destruc-
tion by ESD. iC-JX is also immune to burst transients
according to IEC 1000-4-4 (4 kV; previously IEC 801-
4).