Datasheet

EVAL-ADM8845 Preliminary Technical Data
2 REV. PrB 02/05
C2+
C2-
1␮F
C1+
C1-
1␮F
Charge Pump
1x/1.5x/2x mode
Control
Logic
VCC
C4+
C4-
C4
4.7␮F
Osc
Vref
+
-
LED Current
Control
Circuit
Current Controlled Sinks
Iset
GND
ADM8845
Vout
FB2
FB3
FB4
FB5
FB6
FB1
C3
C3+
C3-
C1 C2
Rset
Current
Control
1
Current
Control
2
Current
Control
3
Current
Control
4
Current
Control
5
Current
Control
6
2.2␮F
CTRL1
CTRL2
SUB MAIN
Figure 1. ADM8845 Functional Block Diagram
CTRL1 CTRL2 LED Operation
0 0 Sub Display Off / Main Display Off
0 1 Sub Display Off / Main Display On
1 0 Sub Display On / Main Display Off
1 1 Sub Display On / Main Display On
Figure 2. ADM8845 Digital Inputs Truth Table
10
11
12
9
1
2
3
4
5 6
7
8
13
14
15
ADM8845
TOP VIEW
(NOT TO SCALE)
16
VCC
VOUT
GND
FB6
FB5
FB4
FB3
FB2
CTRL1
CTRL2
ISET
FB1
C1+
C1-
C2+
C2-
Figure 3. ADM8845 Pin Configuration