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參數(shù)資料
| 型號(hào)： | X40239 |
| 廠商： | Intersil Corporation |
| 英文描述： | Triple Voltage Monitors, POR, 2 kbit EEPROM MEMORY, and Single/Dual DCP |
| 中文描述： | 三電壓監(jiān)測(cè)器，葡萄牙，2千比特EEPROM存儲(chǔ)器，以及單/雙副處長(zhǎng) |
| 文件頁(yè)數(shù)： | 24/36頁(yè) |
| 文件大?。?/td> | 541K |
| 代理商： | X40239 |
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24
FN8115.0
April 11, 2005
For example, the desired threshold for V
TRIP2
is set to
3.0 V, and a test voltage of 3.4 V was applied to the input
pin V2MON (after applying power to V
CC
). The input volt-
age is decreased, and found to trip the associated output
level of pin V2FAIL from a LOW to a HIGH, when
V2MON 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
TRIPx
is
less than the maximum desired error, then the program-
ming process may be terminated. If however, the error
is greater than the maximum desired error, then
another iteration of the V
TRIPx
programming sequence
can be performed (using the calculated error) in order to
further increase the accuracy of the threshold voltage.
If the calculated error is greater than zero, then the
V
TRIPx
must first be “reset”, and then programmed to
the a value equal to the previously set V
TRIPx
minus
the calculated error. If it is the case that the error is
less than zero, then the V
TRIPx
must be programmed
to a value equal to the previously set V
TRIPx
plus the
absolute value of the calculated error.
Continuing the previous example, we see that the cal-
culated error was 0.09V. Since this is greater than
zero, we must first “reset” the V
TRIP2
threshold, then
apply a voltage equal to the last previously pro-
grammed voltage, minus the last previously calculated
error. Therefore, we must apply V
TRIP2
= 2.91 V to pin
V2MON and execute the programming sequence (See
"Setting a Higher V
TRIPx
Voltage (x = 1,2,3)").
Using this process, the desired accuracy for a particu-
lar V
TRIPx
threshold may be attained using a succes-
sive number of iterations.
V
TRIPx
Programming
Power-down
Ramp up Vx
switches
Actual V
TRIPx
- Desired V
TRIPx
= Error
DONE
Execute
V
TRIPx
Reset
Sequence
Set Vx = desired V
TRIPx
Execute
Sequence
Set Higher V
TRIPx
New Vx applied =
Old Vx applied + | Error |
Execute
Reset V
Sequence
New Vx applied =
Old Vx applied - | Error |
Error < MDE
–
| Error | < | MDE |
YES
NO
Error >MDE
+
NO
YES
Figure 24. V
TRIPx
Setting / Reset Sequence (x = 1,2,3)
Desired V
<
present value
Note: X = 1,2,3.
Let: MDE = Maximum Desired Error
Output
Acceptable
Error Range
MDE
+
MDE
–
Error = Actual – Desired
Desired Value
X40231, X40233, X40235, X40237, X40239
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