LIGHT-GRID
DRIVERS / RECEIVERS
Typical applications cover light curtains, light barriers and
electro-sensitive protective equipment in general.
Features
Receivers
The light-grid receiver iCs include a bandpass amplifier plus
input safety switches with the iC-ME and iC-MK resp. on-chip
photo diode with the iC-LK, a differential current-signal output
plus control logic to activate the amplifier and the output.
Drivers
The light-grid driver iCs feature an adjustable LED current sink
which is also controlled by a multi-stage shift register. The
decrease in LED efficiency with a rise in temperature is compensated by a positive temperature coefficient of the
current sink. In order to generate defined light pulses, the LEDs
are actively discharged.
Applications
•
•
•
Light curtains
Light barriers
Electro-sensitive protective equipment (ESPE)
•
•
•
Receivers
Photoelectric amplifier with integrated bandpass, IC-ME and iC-MK with dual inputs, iC-LK with on-chip photo diode
Nonlinear transfer function with a wide dynamic input range
Fast flash recovery time
•
•
•
Drivers
Adjustable LED current, with iC-NX / NXL for up to 8 LEDs
Controlled current slew rate enables short light pulses
LED efficiency degradation compensated by positive
current temperature coefficient
•
•
iC-NX, iC-NXL
Diagnostic message with LED interrupts
LED short-circuit recognition
•
Suited for high-risk applications according to IEC 1496-1
+4.75..6V
C1
PROG
VDD
LED1
LED2
S1
LED3
LED4
LED5
LED6
LED7
LED8
4kΩ
Vref
Sdis1
SEND1
LEDON1
VDD
ILED
NENABLE
CONTROL INPUT
DIN
BYPEN
CHAN1
REG2
LOGIC
D
Q
PBIAS
Q
C
&
CONTROL INPUT
D
BIAS AND POR
NR NR
IDC
OUTPUT
DI1
FF1
CONTROL INPUT
D Q
FF2
Q1
D Q
C
SHEN
C
NR
NR
2.5k Ω
FF3
Q2
&
D Q
1
Q3
NPDR
DO1
EN
SELI
SELI
SEL
NR
CONTROL
LOGIC
SHEN
x1200
&
IOK
POWER DOWN
LED CURRENT SINK
A
RESET
BANDGAP
A
INTERFACE
ISET
0
1
DOUT
R
SIN
DIN
CK
RSET
INH
1
SHUTDOWN
iC−NX
EN
SELI
NPDR
OUTPUT BUFFER
TERMAL
SIN
GND
EN
0
NC
NRES
VDD
SELI
DO8
CLK
DIAG
&
SP
IAC
1
R NR
1
AC FOTO AMP
INTEGRATED PHOTO DIODE
C
NQ
CLK
SN
Clamp
Circuit
REG1
C
D Q
R
0
1
C
D Q
R
C
D Q
DOUT
&
DATA OUTPUT
0
1
CK
CLK
iC−LK
GND
Am Kuemmerling 18 • D -55294 Bodenheim, Germany
Phone: +49 (6135) 9292-300 • Fax: +49 (6135) 9292-192 • http://www.ichaus.com
LIGHT-GRID
DRIVERS / RECEIVERS
A short circuit from output to output, however, fills the shift
register with "ones" and consecutive LEDs are supplied with partial current. When the next device in the chain is activated the
doubled power consumption can be recognised by the system
control via the supply line.
These devices can be programmed to bridge any channel with
the exception of channel 1. To this end the unused LED pins
(pins without an LED) are connected to pin PROG.
Receivers
The logic consists of a multi-stage shift register, which
consecutively enables the bandpass amplifier and the output
stage of one iC after the other in a chain.
For light curtain applications in which only one device is activated at a time, the outputs SN and SP can be connected to a
two-wire bus. The amplifier and output automatically return to
standby after processing the serial input data at DIN. Therefore,
a chain configuration with multiple beams can be set up with
just a single data bit within a shift cycle.
Chip Families
Drivers
With iC-NK and iC-NX the LED pulse duration is defined by two
consecutive clock pulses, whereas with iC-NL and iC-NXL it is
defined by a clock independent modulation input.
iC-NE/NT Family (high gain)
iC-NE
8-fold drivers
A broken LED connection or insufficient LED current is signalled
by manipulating the input current at the input pins SHEN (iCNX) resp. CDI (iC-NXL) which act as bidirectional diagnostic
interfaces. Short circuits at the LED outputs are also detected;
these directly alter the data transfer within the shift register.
An LEDON signal cannot be generated for LED pins which short
circuit with the supply line; the data shift is blocked, causing the
entire shift register to fill with "zeros".
SO8 / MSOP8
Single receiver
iC-ME DFN10
Dual receiver
iC-LK
cQFN16
Single receiver with on-chip photo diode
iC-NT
SO8 / MSOP8
Single LED driver
iC-NX
TSSOP16
8-fold LED driver
iC-NK/NL Family (high speed, modulation input)
iC-NK
SO8 / MSOP8
Single receiver
iC-MK DFN10
Dual receiver
iC-LK
cQFN16
Single receiver with on-chip photo diode
iC-NL
SO8 / MSOP8
Single LED driver
iC-NXL TSSOP16
8-fold LED driver
VDD
GND
CLK
DIN1
IC1
IC2
ICn
VDD
DIN
VDD
DIN
VDD
DIN
GND
CLK
GND
CLK
GND
CLK
SN
SEL
SN
SEL
SN
SEL
DOUT
SP
DOUT
SP
SP
iC−LK
DOUT
iC−LK
DOUTn
iC−LK
SP
SN
VDD
LED11
Cb
RSET
LED10
LED9
LED8
LED7
LED6
LED5
RSET
ISETb
iCb
ISET
LED4
LED5
LED4
LED6
LED3
LED6
LED3
LED7
LED2
LED7
LED1
LED8
iC−NXL
GND
DIN
DINb
PROG
CDI
VDD
DOUT
LED3
LED2
LED1
ISETa
ISET
PROG
LED4
iCa
LED5
LED8
DOUTb
Ca
Logic
MOD
GND
LED2
iC−NXL
LED12
VDD
DOUTa
DOUT
LED1
DIN
CDI
Logic
DINa
GND
MOD
CDI
MOD
This preliminary information is not tantamount to a guarantee of device characteristics. All rights to technical changes reserved.
.
Am Kuemmerling 18 • D -55294 Bodenheim, Germany
Phone: +49 (6135) 9292-300 • Fax: +49 (6135) 9292-192 • http://www.ichaus.com
Rev. 1.0