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CAT1163LIWI-45-GT3 датащи(PDF) 5 Page - ON Semiconductor

номер детали CAT1163LIWI-45-GT3
подробное описание детали  Supervisory Circuits with Supervisory Circuits with
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CAT1163LIWI-45-GT3 датащи(HTML) 5 Page - ON Semiconductor

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CAT1163
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PIN DESCRIPTION
WDI: WATCHDOG INPUT
If there is no transition on the WDI for more than
1.6 seconds, the watchdog timer times out.
WP: WRITE PROTECT
If the pin is tied to VCC the entire memory array becomes
Write Protected (READ only). When the pin is tied to GND
or left floating normal read/write operations are allowed to
the device.
RESET/RESET: RESET I/O
These are open drain pins and can be used as reset trigger
inputs. By forcing a reset condition on the pins the device
will initiate and maintain a reset condition. The RESET pin
must be connected through a pulldown resistor, and the
RESET pin must be connected through a pull−up resistor.
SDA: SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to transfer
all data into and out of the device. The SDA pin is an open
drain output and can be wire−ORed with other open drain or
open collector outputs.
SCL: Serial Clock
Serial clock input.
DEVICE OPERATION
Reset Controller Description
The CAT1163 precision RESET controller ensures
correct system operation during brownout and power
up/down conditions. It is configured with open drain
RESET outputs. During power−up, the RESET outputs
remain active until VCC reaches the VTH threshold and will
continue driving the outputs for approximately 200 ms
(tPURST) after reaching VTH. After the tPURST timeout
interval, the device will cease to drive the reset outputs. At
this point the reset outputs will be pulled up or down by their
respective pull up/down resistors. During power−down, the
RESET outputs will be active when VCC falls below VTH.
The RESET outputs will be valid so long as VCC is > 1.0 V
(VRVALID).
The RESET pins are I/Os; therefore, the CAT1163 can act
as a signal conditioning circuit for an externally applied
manual reset. The inputs are edge triggered; that is, the
RESET input in the CAT1163 will initiate a reset timeout
after detecting a low to high transition and the RESET input
in the CAT1163 will initiate a reset timeout after detecting
a high to low transition.
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, the CAT1163
will respond with a reset signal after a time−out interval of
1.6 seconds for a lack of activity. The CAT1163 is designed
with the Watchdog Timer feature on the WDI input. If the
microcontroller does not toggle the WDI input pin within 1.6
seconds, the Watchdog Timer times out. This will generate
a reset condition on reset outputs. The Watchdog Timer is
cleared by any transition on WDI.
As long as the reset signal is asserted, the Watchdog Timer
will not count and will stay cleared.
Figure 1. RESET Output Timing
GLITCH
t
VCC
PURST
t
PURST
t
RPD
t
RVALID
V
V
TH
RESET
RESET
RPD
t


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