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PDF ADM6315 Data sheet ( Hoja de datos )
| Número de pieza | ADM6315 | |
| Descripción | Open-Drain Microprocessor Supervisory Circuit in 4-Lead SOT-143 | |
| Fabricantes | Analog Devices | |
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a
Open-Drain Microprocessor
Supervisory Circuit in 4-Lead SOT-143
ADM6315
FEATURES
Superior Upgrade for MAX6315
Specified Over Temperature
Low Power Consumption (5 A Typ)
Precision Voltage Monitor of Voltages from 2.5 V to
5 V at 100 mV Increments
Reset Assertion Down to VCC > 1 V
Built-In Manual Reset
Pin Compatible with the ADM811
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments
FUNCTIONAL BLOCK DIAGRAM
GND
ADM6315
VREF
VCC
RESET
RESET
CIRCUITRY
DEBOUNCE
MR
GENERAL DESCRIPTION
The ADM6315 is a reliable voltage monitoring device that is
suitable for use in most voltage monitoring applications.
The ADM6315 is designed to monitor as little as a 1.8% degra-
dation of a power supply voltage. Voltages that can be moni-
tored by the ADM6315 are all voltages (at 100 mV increments)
from 2.5 V to 5 V.
Included in this circuit is a debounced Manual Reset input.
Reset can be activated using an ordinary switch (pulling MR
low), by a low input from another digital device or by a degra-
dation of the supply voltage. The manual reset function is very
useful, especially if the circuit in which the ADM6315 is oper-
ating, enters into a state that can only be detected by the user.
Allowing the user to manually reset a system can reduce the
damage or danger that could be otherwise caused by an out of
control or locked-up system.
The ADM6315 comes in a cost and space efficient SOT-143
package.
VCC
ADM6315
MR RESET
10k⍀
SYSTEM POWER
P
SYSTEM
RESET
GND
GND
Figure 1. Typical Operating Circuit
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
1 page  
INTERFACING TO OTHER DEVICES
OUTPUT
The ADM6315 series is designed to integrate with as many
devices as possible. One feature of the ADM6315 is the RESET
open drain output, which can sink current from sources with a
voltage greater than the VCC of the ADM6315 input making it
suitable for use in more diverse applications.
THE BENEFITS OF A VERY ACCURATE RESET
THRESHOLD
Because the ADM6315 series can operate effectively even when
there are large degradations of the supply voltages (due to an
accurate internal voltage reference circuit), the possibility of a
malfunction during a power failure is greatly reduced.
VCC
VCC TRIP-POINT(MAX)
VCC TRIP-POINT
RST
VCC TO RESET
DELAY
VCC TRIP-POINT(MIN)
VOL
Figure 8. VCC Power-Down/Brownout Timing Diagram
DETAILED DESCRIPTION
The ADM6315 is designed to protect the integrity of a systems
operation by ensuring the proper operation of the system during
power-up, power-down and brownout conditions.
When the ADM6315 is powered-up (depending on the selected
reset active timeout), the RESET output of the ADM6315 will
remain low for a period typically equalling the Reset Active
Timeout Period. This is designed to give the system time to
power-up correctly and for the power supply to stabilize before
any devices are brought out of reset and allowed to begin ex-
ecuting instructions. Initializing a system in this way provides a
more reliable start-up for microprocessor systems.
When a brownout condition occurs (assuming VCC is falling at
1 mV/µs), the ADM6315 will produce a reset in typically 35 µs.
Producing a reset this fast means that the entire system can be
reset together before any part of the systems’ voltage falls below
its recommended operating voltage. This can avoid dangerous
and/or erroneous operation of a microprocessor-based system.
MANUAL RESET INPUT
The ADM6315 also provides an additional input, MR. This
input can be used as either a means for the system operator to
manually reset the system via a switch or for a digital circuit to
reset the system.
ADM6315
The MR input will (typical) ignore negative going pulses faster
than 100 ns and is guaranteed to accept any negative going
input pulse of a duration greater than or equal to 1 µs. If MR is
connected to long cables or used in a noisy environment, then
placing a 1 µF decoupling capacitor between the MR input and
ground will further improve the glitch immunity of the ADM6315.
VCC TRIP-POINT (MIN)
VCC
VCC TRIP-POINT (MAX)
VCC TRIP-POINT
RESET ACTIVE TIMEOUT
RST
Figure 9. VCC Power-Up Timing Diagram
TRANSIENT IMMUNITY
As well as being an accurate reset circuit, the ADM6315 has
good immunity to negative going transients (Figure 5). Because
of this characteristic, the ADM6315 is suitable for use in noisy
environments.
Figure 5 shows the reset comparator overdrive (the maximum
magnitude of negative going pulses with respect to the typical
reset threshold) versus pulse duration, without causing a reset.
REV. 0
–5–
5 Page | ||
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| PDF Descargar | [ Datasheet ADM6315.PDF ] | |
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