IC-JX_16 Datasheet, PDF (2/48 Pages) IC-Haus GmbH – 16-FOLD 24 V HIGH-SIDE DRIVER

iC-JX
16-FOLD 24 V HIGH-SIDE DRIVER WITH µC INTERFACE
Rev C2, Page 2/48
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.
generates interrupt messages for the controller. The
latter is warned before the device is forcibly shut down.
A short circuit also triggers an interrupt message; the
current status here can be read out by the controller.
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-com-
patible serial interface (with one pin for the clock, chip
selection, data input and data output respectively).
The type of interface is selected via pin NSP.
I/O stages with an input function can record logic lev-
els at 24 V where a programmable pull-down/pull-up
current 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 cur-
rents are discharged by the integrated flyback circuits.
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 shut down of all outputs and can be
operated by an autonomous watchdog circuit.
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 cable break, for example) before an
output is switched on. The I/O pin status can always
be read back via comparators. A load current mea-
surement circuit then permits the load to be assessed;
failed valves and faulty or wrongly implemented indi-
cator 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 micro-
controller as digital measurements by an integrated
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 GND-
D-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 shut down.
Undervoltage at 24 V driver supply VB triggers a shut-
down of the output stages without deleting the con-
tents of the registers.
All output stages are short-circuit-proof and protected
against thermal destruction in the event of extreme
power dissipation. Each stage has its own temper-
ature sensor which is evaluated in two stages and
Diodes protect all inputs and outputs against destruc-
tion by ESD. iC-JX is also immune to burst tran-
sients according to IEC 1000-4-4 (4 kV; previously
IEC 801-4).