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TPS3818G12 Datasheet(PDF) 9 Page - Texas Instruments

No. de Pieza. TPS3818G12
Descripción  Low Quiescent Current, Accurate Programmable-Delay Supervisory Circuit
Descarga  16 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS3818G12 Datasheet(HTML) 9 Page - Texas Instruments

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C
T (nF)
+ tD (s)*0.5
10*3 (s)
175
(1)
TPS3818G25
RESET
GND
SENSE V
DD
C
T
MR
GND
GND
C
T
TPS3818G33
RESET
SENSE V
DD
V
I/O
V
CORE
DSP
GPIO
3.3V
1.2V
IMMUNITY TO SENSE PIN VOLTAGE
3.3V
TPS3818xxx
V
DD
SENSE
MR
90kW
GND
SELECTING THE RESET DELAY TIME
20msDelay
300msDelay
(c)
(b)
(a)
TPS3818G33
RESET
SENSE VDD
C
T
TPS3818G33
RESET
SENSE VDD
C
T
TPS3818G33
RESET
SENSE VDD
C
T
3.3V
3.3V
3.3V
50kW
C
T
Delay(s)=+0.5
10
(s)
´
-3
C (nF)
175
T
TPS3818
www.ti.com ......................................................................................................................................................... SBVS106A – MAY 2008 – REVISED AUGUST 2008
by the choice of resistor. Figure 14b shows a fixed
20ms delay time by leaving the CT pin open.
Figure 14c shows a ground referenced capacitor
connected to CT for a user-defined program time
between 1.25ms and 10s.
The capacitor CT should be ≥ 100pF nominal value in
order for the TPS3818xxx to recognize that the
capacitor is present. The capacitor value for a given
delay time can be calculated using the following
equation:
The reset delay time is determined by the time it
Figure 12. Using MR to Monitor Multiple System
takes an on-chip precision 220nA current source to
Voltages
charge the external capacitor to 1.23V. 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 1.23V, RESET is de-asserted. 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.
TRANSIENTS
The TPS3818 is relatively immune to short negative
Figure 13. Using an External MOSFET to Minimize
transients on the SENSE pin. Sensitivity to transients
IDD When MR Signal Does Not Go to VDD
depends on threshold overdrive, as shown in the
Maximum Transient Duration at Sense vs Sense
Threshold Overdrive Voltage graph (Figure 6) in the
Typical Characteristics section.
The TPS3818 has three options for setting the
RESET delay time as shown in Figure 14. Figure 14a
shows the configuration for a fixed 300ms typical
delay time by tying CT to VDD; a resistor from 40kΩ to
200k
Ω must be used. Supply current is not affected
Figure 14. Configuration Used to Set the RESET Delay Time
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): TPS3818


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