SDA2131 ,Static LED Display Driver with Blanking CapabilitySIEMENS
Static LED Display Driver with Blanking Capability
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SDA2131
Static LED Display Driver with Blanking Capability
SUEMENS
Static LED Display Driver with Blanking Capability
Features
0 Integrated load resistances, thus few external components are required
0 Number of LEDs software-selectable
o Blanking capability through DC-controlled input
0 Simple connection to a microcomputer
Ordering Code
Package
SDA 2131-2
067000-A2044
P-DlP-22
SDA 2131-2
Bipolar IC
The SDA 2131-2 includes a static display driver for 16 LEDs, each featuring 10 mA out-
put current. The serial data interface enables a simple connection to the microcomputer.
Circuit Description
A serial interface consisting of data input D, enable input E, and clock input CLK, con-
nects the IC to a microprocessor. The 16-bit information ("H" at input D corresponds to the
current flow at outputs A1 to A16) is loaded into a 16-bit shift register via the serial data
input, beginning with LSB. Data transfer is initiated by the HL slope of the clock pulse at
CLK. The data transfer D can take place only during the H state of the enable input E. A
buffer accepts the data from the shift register during the HL slope of the enable input. The
buffer directly drives the outputs A1 to A16.
The output is limited by an internal resistor of 290 o.
Through input C the outputs can be switched off (V08 = O V).
The inputs D, E, and CLK, and the input C are TTL-compatible.
SDA 2131-2
Block Diagram
16 Outputs . Vs
A1...A16
Blanking _8_ 16 Output Stages
Input L
- 16-Bit Buffer
a 16-Bit Shift Register
Data 0 4 l
Enable E 6 ,
Clock "K"'------";"
" 1231 GNO
Infernal Circuitry
of un Output A: ________
UE1232
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