X40237S16I-BT1 Intersil, X40237S16I-BT1 Datasheet - Page 24

• Manufacturer Part Number: X40237S16I-BT1
• Description: IC VOLTAGE MON TRPL EE 16-SOIC
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of X40237S16I-BT1

• Number Of Voltages Monitored: 3
• Output: Open Drain, Open Drain
• Reset: Active High/Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 1.75V, 2.95V, 4.45V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

For example, the desired threshold for V
3.0 V, and a test voltage of 3.4 V was applied to the input
pin V2MON (after applying power to V
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
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
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
the a value equal to the previously set V
TRIPx
must first be “reset”, and then programmed to
Old Vx applied + | Error |
New Vx applied =
TRIPx
24
Figure 24. V
programming sequence
X40231, X40233, X40235, X40237, X40239
CC
Error < MDE
). The input volt-
TRIP2
TRIPx
TRIPx
NO
NO
is set to
–
TRIPx
Set Vx = desired V
minus
Setting / Reset Sequence (x = 1,2,3)
V
TRIPx
Set Higher V
- Desired V
Desired V
V
Ramp up Vx
Actual V
present value?
is
Power-down
TRIPx
Sequence
Sequence
switches?
Execute
Execute
Programming
= Error
Output
DONE
Reset
YES
| Error | < | MDE |
TRIPx
YES
TRIPx
TRIPx
TRIPx
the calculated error. If it is the case that the error is
less than zero, then the V
to a value equal to the previously set V
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
apply a voltage equal to the last previously pro-
grammed voltage, minus the last previously calculated
error. Therefore, we must apply V
V2MON and execute the programming sequence (See
"Setting a Higher V
Using this process, the desired accuracy for a particu-
lar V
sive number of iterations.
<
TRIPx
TRIPx
Error >MDE
threshold may be attained using a succes-
Old Vx applied - | Error |
New Vx applied =
Reset V
+
Sequence
Execute
TRIPx
Desired Value
Note: X = 1,2,3.
Let: MDE = Maximum Desired Error
TRIPx
Voltage (x = 1,2,3)").
MDE
MDE
TRIPx
Error = Actual – Desired
+
–
must be programmed
TRIP2
TRIP2
Error Range
Acceptable
threshold, then
= 2.91 V to pin
TRIPx
April 11, 2005
plus the
FN8115.0