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AS1123
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
24 23 22 21 20 19
OUTN11
1
18 OUTN4
24 23 22 21 20 19 18 17 16 15 14 13
OUTN12
2
AS1123
17 OUTN3
OUTN13
OUTN14
OUTN15
3
4
5
24-pin TQFN
(4x4mm)
Exposed
16 OUTN2
15 OUTN1
14 OUTN0
AS1123
24-pin QSOP
OEN 6
Pad
13 LD
1
2
3
4
5
6
7
8
9 10 11 12
7
8
9
10 11 12
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
QSOP TQFN
Pin Name
Description
1
2
10
11
GND
SDI
Ground
Serial Data Input
Serial Data Clock . The rising edge of the CLK signal is used to clock data into and out of the
3
12
CLK
AS1123 shift register. In error mode, the rising edge of the CLK signal is used to switch error
modes.
4
5:20
13
1:5, 14:24
LD
OUTN0:15
Serial Data Load. Pull-down Resistor
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.
Output Enable . Pull-up Resistor. The active-low pin OEN signal can always enable output drivers
21
6
OEN
to sink current independent of the AS1123 mode.
0 = Output drivers are enabled.
1 = Output drivers are disabled.
Serial Data Output. In normal mode SDO is latched out 8.5 clock cycles after SDI is latched in.
22
7
SDO
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
24
-
8
9
Exposed
Pad
REXT
VDD
External Resistor Connection . This pin connects through the external resistor (R EXT ) to GND, to
setup the load current.
Positive Supply Voltage
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.
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
2 - 24
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