austria
micro
systems
AS1910 - AS1915
Dual-Voltage Microprocessor Supervisory Circuits
with Reset and Watchdog
Product Brief
1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Revision 0.3
1 - 2
1 General Description
The AS1910 - AS1915 microprocessor supervisory cir-
cuits were designed to generate a reset when one of the
two monitored supply voltages falls below a factory-
trimmed threshold, and to maintain the reset for a mini-
mum timeout period when both supplies are above their
reset thresholds. Guaranteed to be in the correct state
for V
CC
higher than +1.0V, these devices are ideal for
multiple-voltage systems with strict monitoring require-
ments.
The AS1913/AS1914/AS1915 feature factory-trimmed
thresholds to monitor a primary voltage between 1.8 and
3.6V, and a secondary voltage between 0.9 and 2.5V.
For the AS1910/AS1911/AS1912, a secondary monitor-
ing voltage can be user-adjusted via an external resistor
divider down to 0.6V.
The devices are available with the reset output types
listed in Table 1.
The AS1910 - AS1915 include a manual-reset input for
systems that never fully power down the microproces-
sor. Additionally, these devices feature a watchdog timer
to help ensure that the processor is operating within
proper code boundaries.
The AS1910 - AS1915 are available in a 6-pin SOT23
package.
Figure 1. Typical Application Diagram
2 Key Features
!
Primary V
CC
Supervisory Range: +1.8 to +3.6V
!
Secondary V
CC
Supervisory Range: +0.9 to +2.5V
(AS1913/AS1914/AS1915)
!
User-Adjustable Threshold Down to +0.63V
(AS1910/AS1911/AS1912)
!
Guaranteed Reset Valid Down to V
CC
= +1.0V
!
Reset Timeout Delay: 215ms
!
Manual Reset Input
!
Three Reset Output Types
- Active-High Push/Pull
- Active-Low Push/Pull
- Active-Low Open-Drain
!
Watchdog Timeout Period: 1.5s
!
Immune to Fast Negative V
CC
Transients
!
External Components Not Required
!
6-pin SOT23 Package
3 Applications
The devices are ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, critical CPU monitoring, and any
multi-supply application.
Table 1. Standard Products
Model
Reset Output Type
AS1910/AS1913
Active-Low Push/Pull
AS1911/AS1914
Active-High Push/Pull
AS1912/AS1915
Active-Low Open-Drain
External
Reset
CPU
Core
Supply
I/O Supply
V
CC
V
CC2
GND
RESETN
I/O
4
WDI
6
V
CC
3
MRN
GND 2
1
RESETN
5
V
CC2
AS1913/
AS1915
AS1910 - AS1915
austria
micro
systems
Product Brief
1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Revision 0.3
2 - 2
Copyrights
Copyright 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered . All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-
nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
e-mail:
info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com
austria
micro
systems
a leap ahead
PDF 
ZIP