www.austriamicrosystems.com/LED-Driver-ICs/AS1117

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AS1117

Datasheet - P i n o u t

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 2. Pin Descriptions

Pin Name

Pin Number

Description

SDA

22

Serial-Data I/O. Open drain digital I/O I²C data pin.

DIG0:DIG7

1, 2, 4, 5, 6, 7,

23, 24

Digit Drive Lines. Eight digit drive lines that sink current from the display

common cathode. Keyscan detection optional, but must be polled by the

µProzessor.

GND

3

Ground.

KEY

8

Keyscan Input. Keyscan lines for key readback. Can be used for self-adressing.

RESETN

9

Reset Input. Pull this pin to low to resest all registers (set to default values) and

normal operation.

10

set the peak segment current (see Selecting RSET Resistor Value and Using

External Drivers on page 19).

SCL

11

Serial-Clock Input. 3.4MHz maximum rate.

IRQ

21

Interupt Request Output. Open drain pin.

SEGA:SEGG,

SEGDP

12-15, 17-20

Seven Segment and Decimal Point Drive Lines. 8 seven-segment drives and

decimal point drive that source current to the display.

16

Positive Supply Voltage. Connect to +2.7V to +5.5V supply. Bypass this pin to

GND with a 0.1µF capacitor to avoid power supply ripple.

Exposed Pad

Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad or to

the circuit-board ground plane to maximize power dissipation.

SEG E

8

18

SEGB

14

DIG2

1

GND

3

AS1117

DIG5

5

10

12

VDD

16

SEGC

17

SEGG

15

SEGF

13

DIG3

2

DIG4

4

DIG6

6

11

9

7

23

21

19

20

22

24

Exposed

Pad