AS1801-BTDT

AS1801-BTDT Datasheet

AS1801

Part	Datasheet
AS1801-BTDT	AS1801-BTDT (pdf)

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Datasheet AS1801 Ultra-Low Power, Serial Real-Time Clock with Trickle Charger 1 General Description The AS1801 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable squarewave output. Address and data are transferred serially through an bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM / PM indicator. The AS1801 provides a clean clock/calendar start function by clearing the ‘wait_for_start’ flag in the control register. The flag is set whenever a clock/calendar setting takes place and the counter operation is stopped until restarted by clearing the flag. In addition to the basic timekeeping functions the device offers dual power pins for primary and backup power supplies as well as a trickle charger at pin VBAT for the backup battery. The AS1801 provides two modes of frequency trimming for the external quartz crystal in steps of ppm within an 8-second interval and in steps ppm within a 2-day period. None, one or both methods can be used simultaneously. A backup counter counts the seconds during read access to the clock/calendar registers and adds them after the end of the access hence, making sure that date and time stay correct even if the access takes longer than one second. Figure AS1801 - Typical Application Diagram 2 Key Features Clock RTC counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100 / 12-hour format with AM / PM indicator Serial Interface Time-of-Day alarms Frequency Trimming every 8 seconds, every 2 days Stop Flag deep power down detection Flag for clean clock start counter allows long access times >1s of the serial interfaces Square-Wave Output - Defaults to 1Hz on Power-up in 8-pin TDFN 2x2mm to +85ºC Operating temperature range 3 Applications The device is ideal for handhelds like GPS, POS Terminal, Consumer Electronics like Set-Top Box, VCR/Digital Recording Office Equipment such as Fax/Printer, Copier Medical implements such as Glucometer, Medicine Dispenser Telecommunications like Router, Switch, Server and many other applications like Utility Meters, Vending Machines, Thermostats and Modems. Note SCLK and SDA are open drain outputs, pull-up resistors are external 1 - 26 AS1801 Datasheet - Pin Assignments 4 Pin Assignments Figure Pin Assignments Top View X1 1 X2 2 SCLK 3 SDA 4 AS1801 8 VCC VBAT 6 SQW/INT 5 GND Pin Description Table Pin Description Pin Name X1 Pin Number 1 SCLK Datasheet - Ordering Information 11 Ordering Information The devices are available as the standard products shown in Table Table Ordering Information Ordering Code AS1801-BTDT Marking Delivery Form Package A1 Ultra-Low Power, Serial Real-Time Clock with Trickle Charger Tape and Reel 8-pin TDFN 2x2mm Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect: Technical Support is available at For further information and requests, please contact us or find your local distributor at 25 - 26 AS1801 Datasheet - Ordering Information Copyrights Copyright 1997-2012, 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: 26 - 26

PDF Datasheet Preview

Datasheet

AS1801

Ultra-Low Power, Serial Real-Time Clock with Trickle Charger
1 General Description

The AS1801 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable squarewave output. Address and data are transferred serially through an bus.

The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM / PM indicator.

The AS1801 provides a clean clock/calendar start function by clearing the ‘wait_for_start’ flag in the control register. The flag is set whenever a clock/calendar setting takes place and the counter operation is stopped until restarted by clearing the flag.

In addition to the basic timekeeping functions the device offers dual power pins for primary and backup power supplies as well as a trickle charger at pin VBAT for the backup battery.

The AS1801 provides two modes of frequency trimming for the external quartz crystal in steps of ppm within an 8-second interval and in steps ppm within a 2-day period. None, one or both methods can be used simultaneously.

A backup counter counts the seconds during read access to the clock/calendar registers and adds them after the end of the access hence, making sure that date and time stay correct even if the access takes longer than one second.

Figure AS1801 - Typical Application Diagram
2 Key Features

Clock RTC counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
/ 12-hour format with AM / PM indicator

Serial Interface

Time-of-Day alarms

Frequency Trimming every 8 seconds, every 2 days

Stop Flag deep power down detection

Flag for clean clock start
counter allows long access times >1s of the serial interfaces

Square-Wave Output - Defaults to 1Hz on Power-up
in 8-pin TDFN 2x2mm
to +85ºC Operating temperature range
3 Applications

The device is ideal for handhelds like GPS, POS Terminal, Consumer Electronics like Set-Top Box, VCR/Digital Recording Office Equipment such as Fax/Printer, Copier Medical implements such as Glucometer, Medicine Dispenser Telecommunications like Router, Switch, Server and many other applications like Utility Meters, Vending Machines, Thermostats and Modems.

Note SCLK and SDA are open drain outputs, pull-up resistors are external
1 - 26

AS1801

Datasheet - Pin Assignments
4 Pin Assignments

Figure Pin Assignments Top View

X1 1 X2 2 SCLK 3 SDA 4

AS1801
8 VCC

VBAT
6 SQW/INT
5 GND

Pin Description

Table Pin Description Pin Name X1

Pin Number 1

SCLK
Datasheet - Ordering Information
11 Ordering Information

The devices are available as the standard products shown in Table
Table Ordering Information
Ordering Code AS1801-BTDT

Marking

Delivery Form

Package

A1 Ultra-Low Power, Serial Real-Time Clock with Trickle Charger Tape and Reel 8-pin TDFN 2x2mm

Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect:

Technical Support is available at

For further information and requests, please contact us or find your local distributor at
25 - 26

AS1801
Datasheet - Ordering Information

Copyrights

Copyright 1997-2012, 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:
26 - 26

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 AS1801-BTDT Datasheet file may be downloaded here without warranties.

Datasheet ID: AS1801-BTDT 519661