AS1927L-BTDT33S

AS1927L-BTDT33S Datasheet

AS1927

Part	Datasheet
AS1927L-BTDT33S	AS1927L-BTDT33S (pdf)

PDF Datasheet Preview
Datasheet AS1927 Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer 1 General Description 2 Key Features The AS1927 microprocessor supervisory circuits were designed to generate a reset when the monitored supply voltage falls below a factory-trimmed threshold. The reset remains asserted for a minimum timeout period after the supply voltage stabilizes. Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for portable and batterypowered systems with strict monitoring requirements. The devices feature factory-trimmed thresholds to monitor a supply voltage between 1.575V and 4.625V. The devices are available with the reset output types listed in Table Table Standard Products Model Reset Output Type AS1927L Active-Low Push/Pull AS1927H Active-High Push/Pull AS1927D Active-Low Open-Drain The AS1927 include a manual-reset input for systems that never fully power down the microprocessor. Additionally, these devices feature a watchdog timer to ensure that the processor is operating within proper code boundaries. A watchdog disable feature allows to turn off the watchdog if not required or unwanted, as in boot up conditions of microcontrollers. The AS1927 are available in a 6-pin TDFN 2x2mm package. ! 170nA Ultra-Low Supply Current ! VCC Supervisory Range +1.575V to +4.625V for further information see Ordering Information on page 10 ! Guaranteed Reset Valid Down to VCC = +1.0V ! Six Minimum Reset Timeout Period Options from 10ms to 1.2s ! Manual Reset Input ! Watchdog Timeout Period 1.5s or 1.5min ! Three Reset Output Types - Active-Low Push/Pull AS1927L - Active-High Push/Pull AS1927H - Active-Low Open-Drain AS1927D ! Immune to Fast Negative VCC Transients ! External Components Not Required ! Operating Temperature Range -40 to +85°C ! 6-pin TDFN 2x2mm Package 3 Applications The devices are ideal for low-power portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, and critical CPU monitoring applications. Figure AS1927 - Typical Application Diagram External Reset 3 MRN 5 WDD AS1927L/ AS1927D 1 RESETN 4 WDI 2 GND RESETN I/O Supply 1 - 11 AS1927 Datasheet - Pinout 4 Pinout Pin Assignments Figure Pin Assignments Top View RESETN/RESET 1 6 VCC GND 2 AS1927 5 WDD MRN 3 4 WDI Pin Descriptions Table Pin Descriptions Pin Number Pin Name Active-Low Reset Output AS1927L, AS1927D . The RESETN signal toggles from high to low when VCC crosses the threshold falling , or MRN is pulled low, or the RESETN watchdog triggers a reset. This output signal remains low for the reset timeout period see tRP on page 4 after the supervised voltage exceeds its reset threshold, or MRN goes low to high. Active-High Reset Output AS1927H . The RESET signal toggles from low to high RESET when VCC crosses the threshold falling , or MRN is pulled low, or the watchdog triggers a reset. This output signal remains high for the reset timeout period see tRP on page 4 after the supervised voltage exceeds its reset threshold, or MRN goes low to high. GND Ground Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is connected to the internal 20kΩ pullup to VCC. This reset remains active as long as MRN MRN is low and for the reset timeout period see tRP on page 4 after MRN goes high. Note If the manual reset feature is not used, this pin should be unconnected or con- nected to VCC. Datasheet - Ordering Information 10 Ordering Information The devices are available as the standard products shown in Table Table Ordering Information Ordering Code Marking Delivery Form Package AS1927L-BTDT-33s Low Power Supervisory Circuit with 1.9V threshold, 225ms Timeout and 3.3s Watchdog Tape and Reel 6-pin TDFN 2x2mm AS1927L-BTDT-xyz* * on request Low Power Supervisory Circuit with x threshold, y Timeout and z Watchdog Tape and Reel 6-pin TDFN 2x2mm Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect: These devices are available in factory-set VCC thresholds from 1.575V to 4.625V in ~100mV increments. Choose the desired reset threshold suffix from Table 6 and insert it instead of “x” in the part number. Factory-programmed reset timeout periods are also available. Insert the code corresponding to the desired nominal reset timeout period from Table 7 instead of “y” in the part number. For the desired watchdog timeout period insert the suffix from Table 8 as “z” into the ordering code. All devices are available in tape-and-reel only. Table Threshold Voltage Suffix Guide x Suffix a b Suffix Min Typ Max Suffix Min Typ Max Table Timeout Option Suffix Guide y Suffix 1 2 3 4 5 Reset Timeout Periods Typ Max UNITS 900 1200 1200 1800 2400 Table Watchdog Timeout z Suffix s m l x Watchdog Timeout Periods Typ Max UNITS 10 - 11 AS1927 Datasheet Copyrights Copyright 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, 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. austriamicrosystems 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 technical 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 11 - 11

PDF Datasheet Preview

Datasheet

AS1927

Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
1 General Description
2 Key Features

The AS1927 microprocessor supervisory circuits were designed to generate a reset when the monitored supply voltage falls below a factory-trimmed threshold. The reset remains asserted for a minimum timeout period after the supply voltage stabilizes.

Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for portable and batterypowered systems with strict monitoring requirements.

The devices feature factory-trimmed thresholds to monitor a supply voltage between 1.575V and 4.625V.

The devices are available with the reset output types listed in Table

Table Standard Products

Model

Reset Output Type

AS1927L

Active-Low Push/Pull

AS1927H

Active-High Push/Pull

AS1927D

Active-Low Open-Drain

The AS1927 include a manual-reset input for systems that never fully power down the microprocessor.

Additionally, these devices feature a watchdog timer to ensure that the processor is operating within proper code boundaries. A watchdog disable feature allows to turn off the watchdog if not required or unwanted, as in boot up conditions of microcontrollers.

The AS1927 are available in a 6-pin TDFN 2x2mm package.
! 170nA Ultra-Low Supply Current ! VCC Supervisory Range +1.575V to +4.625V
for further information see Ordering Information on page 10 ! Guaranteed Reset Valid Down to VCC = +1.0V ! Six Minimum Reset Timeout Period Options from 10ms to 1.2s ! Manual Reset Input ! Watchdog Timeout Period 1.5s or 1.5min ! Three Reset Output Types
- Active-Low Push/Pull AS1927L - Active-High Push/Pull AS1927H - Active-Low Open-Drain AS1927D
! Immune to Fast Negative VCC Transients ! External Components Not Required ! Operating Temperature Range -40 to +85°C ! 6-pin TDFN 2x2mm Package
3 Applications

The devices are ideal for low-power portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, and critical CPU monitoring applications.

Figure AS1927 - Typical Application Diagram

External Reset
3 MRN
5 WDD

AS1927L/ AS1927D
1 RESETN 4 WDI 2 GND

RESETN

I/O Supply
1 - 11

AS1927

Datasheet - Pinout
4 Pinout

Pin Assignments

Figure Pin Assignments Top View

RESETN/RESET 1
6 VCC

GND 2 AS1927 5 WDD

MRN 3
4 WDI

Pin Descriptions

Table Pin Descriptions

Pin Number Pin Name

Active-Low Reset Output AS1927L, AS1927D . The RESETN signal toggles from
high to low when VCC crosses the threshold falling , or MRN is pulled low, or the RESETN watchdog triggers a reset. This output signal remains low for the reset timeout period
see tRP on page 4 after the supervised voltage exceeds its reset threshold, or MRN
goes low to high.

Active-High Reset Output AS1927H . The RESET signal toggles from low to high

RESET
when VCC crosses the threshold falling , or MRN is pulled low, or the watchdog triggers a reset. This output signal remains high for the reset timeout period see tRP on page 4
after the supervised voltage exceeds its reset threshold, or MRN goes low to high.

GND Ground

Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is
connected to the internal 20kΩ pullup to VCC. This reset remains active as long as MRN

MRN is low and for the reset timeout period see tRP on page 4 after MRN goes high.

Note If the manual reset feature is not used, this pin should be unconnected or con-
nected to VCC.
Datasheet - Ordering Information
10 Ordering Information

The devices are available as the standard products shown in Table
Table Ordering Information
Ordering Code

Marking

Delivery Form Package

AS1927L-BTDT-33s

Low Power Supervisory Circuit with 1.9V threshold, 225ms Timeout and 3.3s Watchdog

Tape and Reel
6-pin TDFN 2x2mm

AS1927L-BTDT-xyz*
* on request

Low Power Supervisory Circuit with x threshold, y Timeout and z Watchdog

Tape and Reel
6-pin TDFN 2x2mm

Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect:
These devices are available in factory-set VCC thresholds from 1.575V to 4.625V in ~100mV increments. Choose the desired reset threshold suffix from Table 6 and insert it instead of “x” in the part number. Factory-programmed reset timeout periods are also available. Insert the code corresponding to the desired nominal reset timeout period from Table 7 instead of “y” in the part number. For the desired watchdog timeout period insert the suffix from Table 8 as “z” into the ordering code.

All devices are available in tape-and-reel only.

Table Threshold Voltage Suffix Guide x

Suffix a b

Suffix Min Typ Max

Suffix Min Typ Max

Table Timeout Option Suffix Guide y

Suffix
1 2 3 4 5

Reset Timeout Periods

Typ Max UNITS
900 1200
1200 1800 2400

Table Watchdog Timeout z

Suffix
s m l x

Watchdog Timeout Periods

Typ Max UNITS
10 - 11

AS1927

Datasheet

Copyrights

Copyright 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, 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. austriamicrosystems 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 technical 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
11 - 11

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS1927L-BTDT33S Datasheet file may be downloaded here without warranties.

Datasheet ID: AS1927L-BTDT33S 519672