AMG-SO204 Datasheet, PDF (17/30 Pages) alpha microelectronics gmbh – Optical Switch IC

0] ^10k
INCLK
LED Display
(7 segment x 8 digits)
220
ROW[7:0] 1k
20MHz
e.g. CFPS-39
100n
AMG-SO204
Optical Switch IC
BUSRXD
33
LED Display
(7 segment x 8 digits)
10
BUSTXD ^3.3k
Figure 10: Row driver circuitry for LED Display
If the internal OA1 is disabled (see chapter 5.1), an external OA can be connected to RF and
REFEXT as shown in fig. 11.
3.3V
3.3V
µPC4572
100k
RF
OA1
100nF
Photo-
diode
REFEXT
100nF
Figure 11: external Current-to-Voltage Converter OA1 (intern OA1 is inactive)
AMG-SO204 Revision: A
29. Jul. 2010 © All rights reserved Page 17 of 30