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TPS3421ECDRYT датащи(PDF) 10 Page - Texas Instruments

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номер детали TPS3421ECDRYT
подробное описание детали  Low-Power, Push-Button Controllers with Configurable Delay
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS3421ECDRYT датащи(HTML) 10 Page - Texas Instruments

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IN
VCC
PB1
RST
GND
ON
GND
Load
Switch
Device
TST
VIN = 1.6 V to 6.5 V
TS
OUT
System
Power
Push-Button
Switch
+
IN
VCC
PB1
RST
GND
ON
GND
Load
Switch
Device
PB2
VIN = 1.6 V to 6.5 V
TS
OUT
System
Power
Push-Button
Switch
+
TPS3420
TPS3421
TPS3422
SBVS211A – AUGUST 2012 – REVISED MARCH 2013
www.ti.com
TPS3421 Inputs (PB1, PB2)
The TPS3421 has two inputs: PB1 and PB2. External pull-up resistors to VCC are required to pull the input pins
high, as shown in Figure 15. When input conditions are met (that is, when both inputs are held low
simultaneously for the push-button timer period, ttimer), the device asserts a single reset pulse of a fixed time (trst);
see Figure 2. Reset deassertion is independent of the inputs because trst is a fixed time pulse. A reset pulse
occurs only one time after each valid input condition. At least one input pin must be released (go high) and then
driven low for the ttimer duration before RST asserts again; see Figure 17.
NOTE: Connect TS to VCC or ground for different PB time delays. Connect one PB input to ground for use as a single channel.
Figure 15. TPS3421 Application Diagram
TPS3422 Input (PB1)
The TPS3422 has only one input: PB1. This input has an internal pull-up resistor to VCC. When input conditions
are met (that is, when the input is held low for the push-button timer period, ttimer), the device asserts a single
reset pulse of a fixed time (trst); see Figure 3. Reset deassertion is independent of the input because trst is a fixed
time pulse. A reset pulse occurs only one time after each valid input condition. The input pin must be released
(go high) and then driven low for the ttimer period before RST asserts again. An application diagram is shown in
Figure 16.
NOTE: Connect TS to VCC or ground for different PB time delays.
Figure 16. TPS3422 Application Diagram
10
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: TPS3420 TPS3421 TPS3422


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