Datasheet

Crameda Intersys AG CC-DS-E-0011
Pumpwerkstrasse 23 Seite : 10
CH-8105 Regensdorf · Schweiz http://www.crameda.com
Type 821
! 7-segment display
! Height of character 16 mm
! Memory
! BCD-Input
! Signal level adaptation
! 24 V Signal- and supply voltage
! Depth when mounted 74 mm
! CE-konform
Circuit diagram
In this module, the display is controlled by the BCD code in
positive logic. The signal and supply voltage is +24 V. A
control signal (input EL) makes it possible to freeze the
display without affecting incoming BCD signals. Inputs «BI»
and «LT» are already connected to the 24 V power supply via
internal resistors. If these inputs are not used, the module will
function properly due to these resistors. Both of these inputs
must be controlled in open collector circuits.
Technical data
Character height 16 mm
Supply voltage V
CC
12...30 V
Supply current I
CC
with V
CC
= 12 V typ. 52 mA
= 24 V typ. 32 mA
= 30 V typ. 28 mA
Signal voltage 10 V...30 V
Limit frequency with V
CC
= 12 V ≤ 10 kHz
= 24 V ≤ 515 kHz
= 30 V ≤ 20 kHz
Depth behind panel 74 mm
Input data:
Input voltage all inputs (except DP)
U
in
«0» min. -3.5 V
or open
max. +2 V
U
in
«1» min. +10 V
max. +30 V
Input voltage Input DP
U
in
«0» min. -3.5 V
max. +0.7 V
U
in
«1» min. +1.1 V
max. +30 V
or open
Input currents all inputs (except BI, LT and DP)
All inputs are connected to ØV.
l
in
«0» with U
in
= -3.5 V max. -150 µA
= +2 V max. 140 µA
l
in
«1» with U
in
= +10 V max. 700 µA
l
in
«0» with U
in
= +30 V max. 2.6 µA
Input currents inputs LT, BI
Pull-up resistances 3.3 KΩ
l
in
«0» with U
in
= -3.5 V max. -11 mA
= +2 V max. -9.2 mA
l
in
«1» with U
in
= +10 V max. -7.2 mA
= +30 V max. 3 mA
Input voltage Input DP
l
in
«0» with U
in
= -3.5 V max. -1 mA
= +0.7 V max. -400 µA
l
in
«1» with U
in
= +1.1 V max. -10 µA
= +30 V max. 1 µA
DP (Decimal point): «DP» on «0» Decimal point on
«DP» on «1» Decimal point off
(+24 V or open)
Truth table
Inputs Outputs
LT* BI* EL
D
2
3
C
2
2
B
2
1
A
2
0
Display
1 1 0 0 0 0 0 0
1 1 0 0 0 0 1 1
1 1 0 0 0 1 0 2
1 1 0 0 0 1 1 3
1 1 0 0 1 0 0 4
1 1 0 0 1 0 1 5
1 1 0 0 1 1 0 6
1 1 0 0 1 1 1 7
1 1 0 1 0 0 0 8
1 1 0 1 0 0 1 9
0 1 x x x x x 8 (Test)
1 0 x x x x x none
1 1 1 x x x x stored**
x = «0» or «1»
* Inputs BI and LT are internally wired to 1. An open
collector control circuit is needed.
** Controlled by the applied BCD code during the leading
edge of the «EL» instruction signal (aus dt. Vorlage).
Supply current in relation to supply voltage
Type VDC Ordering code
821, 24 V 821-057-21