3
FN8208.2
September 7, 2010
PIN CONFIGURATION
DETAILED DEVICE DESCRIPTION
The X9522 combines three Intersil Digitally Con-
trolled Potentiometer (DCP) devices, and two volt-
age monitors, in one package. These functions are
suited to the control, support, and monitoring of
various system parameters in fiber optic modules.
The combination of the X9522 functionality lowers
system cost, increases reliability, and reduces
board space requirements.
Two high resolution DCPs allow for the “set-and-
forget” adjustment of Laser Driver IC parameters
such as Laser Diode Bias and Modulation Cur-
rents. One lower resolution DCP may be used for
setting sundry system parameters such as maxi-
mum laser output power (for eye safety require-
ments).
The dual Voltage Monitor circuits continuously
compare their inputs to individual trip voltages. If
an input voltage exceeds it’s associated trip level,
a hardware output (V3RO, V2RO) are allowed to go
HIGH. If the input voltage becomes lower than it’s
associated trip level, the corresponding output is
driven LOW. A corresponding binary representa-
tion of the two monitor circuit outputs (V2RO and
V3RO) are also stored in latched, volatile (CON-
STAT) register bits. The status of these two moni-
tor outputs can be read out via the 2-wire serial
port.
Intersil’s unique circuits allow for all internal trip
voltages to be individually programmed with high
accuracy. This gives the designer great flexibility
in changing system parameters, either at the time
of manufacture, or in the field.
The device features a 2-Wire interface and soft-
ware protocol allowing operation on an I
2
C™ com-
patible serial bus.
V2
R
L2
R
H0
3
4
Vcc / V1
SCL
R
W0
R
L0
R
W1
R
H1
7
8
V3
V
SS
10
R
L1
R
H2
1
18
19
17
20
14
15
13
16
12
11
NC
6
R
W2
2
SDA
9
V3RO
5
WP
NC
V2RO
NOT TO SCALE
20 Pin TSSOP
X9522
