AS1910_1 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 15
Technical content
1 General Description
3.6V, and a secondary voltage between 0.9 and 2.5V. Figure 1. Typical Application Diagram
2 Key Features
3 Applications
Table 1. Standard Products
4 Pinout
Figure 2. Pin Assignments (Top View) Table 2. Pin Descriptions exceed their reset threshold, or MRN goes low to high, or the watchdog triggers a reset. exceed their reset threshold, or MRN goes low to high, or the watchdog triggers a reset. the reset timeout period (see tRP on page 5) after MRN goes high. reset is a asserted or when WDI senses a rising or falling edge. external resistor-divider network to set the reset threshold voltage (down to 0.63V). secondary supervised voltage input. 6V CC Primary Supervised Voltage Input. This pin serves as the primary supervised voltage input.
4 WDI
5 RESETIN/VCC2
6 VCC
5 Absolute Maximum Ratings
Table 3. Absolute Maximum Ratings State Surface Mount Devices”.
6 Electrical Characteristics
TAMB = -40 to +125ºC (unless otherwise specified). Typ values @ TAMB = +25°C. Table 4. Electrical Characteristics
Table 4. Electrical Characteristics (Continued)
- Over-temperature limits are guaranteed by design and not production tested. Devices tested at +25ºC.
- Guaranteed by design and not production tested.
7 Typical Operating Characteristics
TAMB = +25ºC (unless otherwise specified). Figure 5. Reset Timeout Period vs. Temperature Figure 6. Supply Current vs. Temperature
8 Detailed Description
reset for a minimum timeout period (see tRP on page 5) after all supplies have stabilized. allows for an externally activated system reset. RESETN output return to their original state (see Figure 10). Figure 9. Functional Diagram of VCC Supervisory Application Figure 10. Reset Timing Diagram
Note: The watchdog timer can be cleared with a reset pulse or by toggling WDI. Figure 13. Watchdog Timing Relationship 10µA and the maximum allowable load capacitance is 200pF. it can be left open if not used. page 1); external debounce circuitry is not required in this configuration. GND will provide additional noise immunity. The RESET signal is the inverse of the RESETN signal.
9 Application Information
low-high-low once within the first 7/8 (87.5%) of the watchdog timeout period to reset the watchdog timer. Note: If WDI is externally driven high for the majority of the timeout period, up to 160µA can flow into pin WDI. a single pullup resistor (see Figure 14) allows the AS1912/AS1912 to assert a reset. Figure 14. AS1912 or AS1915 RESETN-to-CPU Bi-Directional Reset Pin ally immune to such transients. Resets are issued to the CPU during power-up, powerdown, and brownout conditions. Note: VCC transients that go 100mV below the reset threshold and last ≤ 55µs typically will not assert a reset pulse. Careful consideration should be taken when implementing the AS1910 - AS1915 watchdog feature. watchdog timer would continue to be reset inside the loop, preventing the watchdog from ever timing out. dog timer is allowed to time out, causing a reset or interrupt to be issued (see Watchdog Input Current on page 11). (87.5%) of the timeout period and periodically pulsing it low-high-low.
Figure 15. Example Watchdog Programming Flowchart
The devices are available in a 6-pin SOT23 package. Figure 16. 6-pin SOT23 Package
- All dimensions are in millimeters.
- Foot length measured at intercept point between datum A and lead surface.
- Package outline inclusive of mold flash 7 metal burr.
- Package outline inclusive of solder plating.
- PKG ST 0004 Rev A supersedes SOT23-D-2005 Rev C.
The devices are available as the standard products shown in Table 5. Table 5. Ordering Information
www.austriamicrosystems.com Revision 1.00 15 - 15 AS1910 - AS1915 Data Sheet Copyrights Copyright © 1997-2007, 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. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. 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 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact