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APX825A

Description
1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5
Categoryaccessories   
File Size173KB,12 Pages
ManufacturerDiodes
Websitehttp://www.diodes.com/
Download Datasheet View All

APX825A Overview

1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5

APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Description
The APX823/APX824/APX825A family of supervisors
provides circuit initialization and timing supervision, primarily
for DSP and processor-based systems.
During power-on,
RESET
is asserted when supply voltage
V
CC
becomes higher than 1.1V. Thereafter, the supply
voltage supervisor monitors V
CC
and keeps
RESET
active as
long as V
CC
remains below the threshold voltage V
TH-
. An
internal timer delays the return of the output to the inactive
state (high) to ensure proper system reset. The delay time, t
d
starts after V
CC
has risen above the threshold voltage V
TH-
.
When the supply voltage drops below the threshold voltage
V
TH-
, the output becomes active (low) again. No external
components are required. All the devices of this family have a
fixed-sense threshold voltage V
TH-
set by an internal voltage
divider.
The APX823/APX825A devices incorporate a manual reset
input,
MR
. A low level at
MR
causes
RESET
to become
active. The APX824/APX825A devices include a high-level
output RESET. APX823/APX824/APX825A have a watchdog
timer that is periodically triggered by a positive or negative
transition at WDI. When the supervising system fails to
retrigger the watchdog circuit within the time-out interval,
ttout,
RESET
becomes active for the time period td. This
event also reinitializes the watchdog timer. Leaving WDI
unconnected disables the watchdog.
In applications where the input to the WDI pin may be active
(transitioning high and low) when the APX823/APX824/APX8
25A asserting
RESET
the APX823/APX824/APX825A does
not return to a non-reset state when the input voltage is
above Vt. The product spectrum is designed for supply
voltage of 2.5V, 3V, 3.3V and 5V. The circuits are available in
a
SOT25
and
SOT26
packages.
The
APX823/APX824/APX825A devices are characterized for
o
o
operation over a temperature range of -40 C to 105 C.
Pin Assignments
 
RESET
1
APX823
4 WDI
SOT25
(Top View)
5 V
CC
GND 2
MR
3
 
RESET 1
GND 2
RESET 3
(Top View)
5 V
CC
APX824
4 WDI
SOT25
 
RESET 1
GND 2
RESET 3
(Top View)
6 V
CC
APX825A
5 WDI
4 MR
SOT26
Features
Applications
Note:
Power-on reset generator with fixed delay time of 200ms
Typ
Manual reset input (APX823/APX825A)
Reset output available in active-low
(APX823/APX824/APX825A), active-high
(APX824/APX825A)
Supply voltage supervision range 2.5V, 3V, 3.3V, 5V
Watchdog timer
Supply current of 30μA (Typ.)
Temperature range: -40°C to 85°C
SOT25 and SOT26: Available in “Green” Molding
Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
Applications Using DSPs, Microcontrollers, or
Microprocessors
Industrial Equipment
Programmable Controls
Automotive Systems
Portable/Battery-Powered Equipment
Intelligent Instruments
Wireless Communications Systems
Notebook/Desktop Computers
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see
EU Directive 2002/95/EC Annex Notes.
APX823/APX824/APX825A
Document number: DS31323 Rev. 4 - 2
1 of 12
www.diodes.com
May 2011
© Diodes Incorporated
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