x9520v20iz-bt1 Intersil Corporation, x9520v20iz-bt1 Datasheet - Page 17

• Manufacturer Part Number: x9520v20iz-bt1
• Description: Fiber Channel/gigabit Ethernet Laser Diode Control For Fiber Optic Modules Triple Dcp, Por, 2kbit Eeprom Memory, Dual Voltage Monitors
• Manufacturer: Intersil Corporation

initiates the programming sequence. Pin WP must then be
brought LOW to complete the operation (See Figure 23).The
user does not have to set the WEL bit in the CONSTAT
register before performing this write sequence.
After being reset, the value of V
value of 1.7V.
V
The accuracy with which the V
be controlled using the iterative process shown in Figure 24.
If the desired threshold is less that the present threshold
voltage, then it must first be “reset” (See "Resetting the
VTRIPx Voltage (x = 1,2,3).").
The desired threshold voltage is then applied to the appropriate
input pin (V1/VCC, V2 or V3) and the procedure described in
Section “Setting a Higher V
TRIPx
V1/VCC
WP
V2, V3
SCL
SDA
WP
Accuracy (x = 1,2,3).
SCL
SDA
R
S
T
A
T
0 1 2 3 4 5 6 7
R
S
T
A
T
0 1 2 3 4 5 6 7
TRIPx
17
A0h †
TRIPx
TRIPx
Voltage“ must be followed.
A0h
thresholds are set, can
†
becomes a nominal
FIGURE 23. RESETTING THE V
V
TRIPx
FIGURE 22. SETTING V
0 1 2 3 4 5 6 7
03h
0Bh
0Fh
0 1 2 3 4 5 6 7
†
†
†
01h
09h
0Dh
Resets VTRIP1
Resets VTRIP3
V
Resets VTRIP2
P
†
†
†
X9520
sets V
sets V
sets V
V
P
TRIP1
TRIP2
TRIP3
TRIPx
TRIPX
Once the desired V
between the desired and (new) actual set threshold can be
determined. This is achieved by applying V1/VCC to the
device, and then applying a test voltage higher than the desired
threshold voltage, to the input pin of the voltage monitor circuit
whose V
set to a desired level of 3.0 V, then a test voltage of 3.4 V may
be applied to the voltage monitor input pin V2. In the case of
setting of V
cases, care should be taken not to exceed the maximum input
voltage limits.
After applying the test voltage to the voltage monitor input
pin, the test voltage can be decreased (either in discrete
steps, or continuously) until the output of the voltage monitor
circuit changes state. At this point, the error between the
actual/measured, and desired threshold levels is calculated.
For example, the desired threshold for V
and a test voltage of 3.4 V was applied to the input pin V2 (after
LEVEL
TO A HIGHER LEVEL (X = 1,2,3).
TRIPx
0 1 2 3 4 5 6 7
Data Byte
TRIP1
00h †
0 1 2 3 4 5 6 7
was programmed. For example, if V
Data Byte †
then only V1/VCC need be applied. In all
TRIPx
00h
threshold has been set, the error
†
All others Reserved.
†
All others Reserved.
TRIP2
is set to 3.0 V,
TRIP2
August 20, 2007
FN8206.2
was