x9520v20iz-bt1 Intersil Corporation, x9520v20iz-bt1 Datasheet - Page 18

• 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

applying power to V1/VCC). The input voltage is decreased,
and found to trip the associated output level of pin V2RO from a
LOW to a HIGH, when V2 reaches 3.09 V. From this, it can be
calculated that the programming error is 3.09 - 3.0 = 0.09 V.
If the error between the desired and measured V
less than the maximum desired error, then the programming
process may be terminated. If however, the error is greater
than the maximum desired error, then another iteration of the
V
calculated error) in order to further increase the accuracy of
the threshold voltage.
If the calculated error is greater than zero, then the V
must first be “reset”, and then programmed to the a value equal
TRIPx
programming sequence can be performed (using the
Old Vx applied
New Vx applied =
18
+
| Error |
FIGURE 24. V
Error < MDE
NO
NO
TRIPx
TRIPx
TRIPx
–
Set Vx = desired V
> Desired V
SETTING/RESET SEQUENCE (X = 1,2,3)
V
Apply VCC & Voltage
is
TRIPx
Set Higher V
-
Desired V
Desired V
V
Decrease Vx
Actual V
present value?
TRIPx
Sequence
switches?
Sequence
Execute
Execute
Output
= Error
Programming
DONE
X9520
Reset
TRIPx
TRIPx
YES
| Error | < | MDE |
TRIPx
YES
TRIPx
TRIPx
TRIPx
<
to Vx
to the previously set V
the case that the error is less than zero, then the V
be programmed to a value equal to the previously set V
plus the absolute value of the calculated error.
Continuing the previous example, we see that the calculated
error was 0.09V. Since this is greater than zero, we must first
“reset” the V
last previously programmed voltage, minus the last previously
calculated error. Therefore, we must apply V
pin V2 and execute the programming sequence.
Using this process, the desired accuracy for a particular
V
number of iterations.
TRIPx
Error >MDE
threshold may be attained using a successive
TRIP2
Old Vx applied
New Vx applied =
+
Reset V
threshold, then apply a voltage equal to the
Sequence
Execute
Desired Value
TRIPx
Note: X = 1,2,3.
Let: MDE = Maximum Desired Error
TRIPx
-
| Error |
minus the calculated error. If it is
MDE
MDE
Error = Actual - Desired
+
–
Error Range
Acceptable
TRIP2
TRIPx
= 2.91 V to
August 20, 2007
TRIPx
FN8206.2
must