www.austriamicrosystems.com/LED-Driver-ICs/AS1100

Revision 1.37

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AS1100

Datasheet - P i n A s s i g n m e n t s

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

4.1 Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

Description

1

DIN

Data input. Data is programmed into the 16Bit shift register on the rising CLK edge

2, 3, 5:8, 10, 11

DIG 0 : DIG 7

8 digit driver lines that sink the current from the common cathode of the display. In shutdown

mode the AS1100 switches the outputs to VDD.

4, 9

GND

Both GND pins must be connected.

12

LOAD/CS

Strobe input. With the rising edge of the LOAD signal the 16 bit of serial data is latched into

the register.

13

CLK

Clock input. The interface is capable to support clock frequencies up to 10MHz. The serial

data is clocked into the internal shift register with the rising edge of the CLK signal. On the

DOUT pin the data is applied with the falling edge of CLK.

14:17, 20:23

SEGA:G, DP

Seven segment driver lines including the decimal point. When a segment is turned off the

output is connected to GND.

18

ISET

The current into ISET determines the peak current through the segments and therefore the

brightness.

19

VDD

Positive Supply Voltage (+5V)

24

DOUT

Serial data output for cascading drivers. The output is valid after 16.5 clock cycles. The

output is never set to high impedance.

11

12

13

14

15

16

17

18

19

20

21

22

23

DIG4

AS1100

10

1

2

3

4

5

6

7

8

9

24 DOUT

DIN

DIG0

GND

DIG6

DIG2

GND

DIG3

LOAD

SEG D

SEG DP

SEG E

SEG C

VDD

ISET

SEG G

SEG B

SEG F

SEG A

CLK

DIG7

DIG5

DIG1