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TPS3808G50-Q1 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS3808G50-Q1
Description  Low-Quiescent-Current, Programmable-Delay Supervisory Circuit
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3808G50-Q1 Fiches technique(HTML) 11 Page - Texas Instruments

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C
T (nF)
t
D (s)
0.5
10 3 (s)
175
=
[
]
×
×
-
Delay (s) = CT (nF) + 0.5 x 10−3 (s)
20ms Delay
300ms Delay
(c)
(b)
(a)
175
3.3V
TPS3808G33
V
DD
SENSE
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
50k
RESET
V
IN
TPS3808G01
V
DD
SENSE
GND
RESET
R
1
R
2
1nF
V
=(1+)0.405
IT
¢
R1
R2
V
OUT
TPS3808
www.ti.com
SBVS050K – MAY 2004 – REVISED OCTOBER 2015
Feature Description (continued)
Figure 9. Using the TPS3808G01 to Monitor a User-Defined Threshold Voltage
8.3.2 Selecting the RESET Delay Time
The TPS3808 has three options for setting the RESET delay time as shown in Figure 10. Figure 10 (a) shows
the configuration for a fixed 300-ms typical delay time by tying CT to VDD; a resistor from 40 kΩ to 200 kΩ must
be used. Supply current is not affected by the choice of resistor. Figure 10 (b) shows a fixed 20-ms delay time by
leaving the CT pin open. Figure 10 (c) shows a ground referenced capacitor connected to CT for a user-defined
program time between 1.25 ms and 10 s.
Figure 10. Configuration Used to Set the RESET Delay Time
The capacitor CT should be ≥ 100 pF nominal value in order for the TPS3808xxx to recognize that the capacitor
is present. The capacitor value for a given delay time can be calculated using Equation 1.
(1)
The reset delay time is determined by the time it takes an on-chip precision 220-nA current source to charge the
external capacitor to 1.23 V. When a RESET is asserted, the capacitor is discharged. When the RESET
conditions are cleared, the internal current source is enabled and begins to charge the external capacitor. When
the voltage on this capacitor reaches 1.23 V, RESET is deasserted. Note that a low-leakage type capacitor such
as a ceramic should be used, and that stray capacitance around this pin may cause errors in the reset delay
time.
Copyright © 2004–2015, Texas Instruments Incorporated
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