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Revision 1.00

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AS1123

Datasheet - P i n o u t

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

Description

QSOP

TQFN

1

10

GND

Ground

2

11

SDI

Serial Data Input

3

12

CLK

Serial Data Clock. The rising edge of the CLK signal is used to clock data into and out of the

AS1123 shift register. In error mode, the rising edge of the CLK signal is used to switch error

modes.

4

13

LD

Serial Data Load. Pull-down Resistor

5:20

1:5, 14:24

OUTN0:15

Output Current Drivers. These pins are used as LED drivers or for input sense for diagnostic

modes. Data is transferred to the data register at the rising edge of these pins.

21

6

OEN

Output Enable. Pull-up Resistor. The active-low pin OEN signal can always enable output drivers

to sink current independent of the AS1123 mode.

0 = Output drivers are enabled.

1 = Output drivers are disabled.

22

7

SDO

Serial Data Output. In normal mode SDO is latched out 8.5 clock cycles after SDI is latched in.

In global error detection mode this pin indicates the occurrence of a global error.

0 = Global error mode returned an error.

1 = No errors.

23

8

REXT

setup the load current.

24

9

VDD

Positive Supply Voltage

-

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.

1

AS1123

24-pin QSOP

24

2

3

4

5

23 22 21

17

8

7

6

20 19 18

9

13

12

11

10

16 15 14

OUTN4

8

18

OUTN0

14

OUTN11

1

OUTN13

3

OUTN15

5

10

12

OUTN2

16

OUTN3

17

OUTN1

15

LD

13

OUTN12

2

OUTN14

4

OEN

6

11

9

7

23

21

19

20

22

24

Exposed

Pad

AS1123

24-pin TQFN

(4x4mm)