PDSP1880 Datasheet, PDF (7/15 Pages) OSRAM GmbH – Alphanumeric Programmable Display™

PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884
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4567
IDPA5110
Pin Assignments
Pin # Name Symbol Definition
1
Reset RST
Initializes display; clears Character
RAM (20H), Flash RAM (00H),
control word (00H), and resets
internal counters. UDC Address
Register and UDC RAM
unaffected.
2
Flash FL
Accesses Flash RAM. Address
inputs A0–A2 select digit address
while data bit D0 sets (D0=1) or
resets (D0=0) Flash bit, A3 and A4
ignored.
3
Address A0
input
A0–A2 select specific digits.
See Table „Memory Selection“
(page 9).
4
A1
Same as A0
5
A2
Same as A0
6
Address A3
input
A3 and A4 access parts of memory
together with Flash pin. See Table
1.
7–9 No pins —
No connections
10
Address A4
input
Same as A3
11
Clock CLS
Selects internal or external clock
Select
source. CLS=1 selects internal
clock (master), CLS=0 selects
external clock (slave operation).
12
Clock CLK
Inputs or outputs clock as
In/Out
determined by CLS.
13
Write WR
Writes data into display when
WR=0. Note CE=0 to enable write
cycle.
14
Chip
CE
Enable
Enables display’s write and read
cycles when CE=0.
15
Positive V_CC
supply
Positive power supply input.
Pin Assignments
Pin # Name Symbol Definition
16
Supply GND_sup Analog ground for LED drivers
ground
17
—
NC
No connection
18
Logic GND_log Logic ground for digital
ground
circuitry
19
Read RD
Reads data from display when
RD=0. Also CE=0.
20
Data bit D0
zero
Least significant data bit.
21
Data bit D1
one
Second data bit.
22–24 No pins —
No connections
25
Data bit D2
two
Third data bit.
26
Data bit D3
three
Fourth data bit.
27
Data bit D4
four
Fifth data bit.
28
Data bit D5
five
Sixth data bit.
29
Data bit D6
six
Seventh data bit.
30
Data bit D7
seven
Most significant data bit.
Cascading Displays
The PDSP188X is designed to drive up to 16 other
PDSP188Xs with input loading of 15 pF each.
General requirements for cascading 16 displays
together:
• Determine the correct address for each display.
• Use CE from an address decoder to select the correct
display.
• Use CE from an address decoder to select the correct
display.
• Select one of the Displays to provide the Clock for the
other displays. Connect CLKSEL to V_CC for this dis-
play.
• Tie CLKSEL to ground on other displays.
• Use RST to synchronize the blinking between the dis-
plays.
2006-03-30
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