AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (1) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release AB18XX Features Sub-threshold Power Optimized Technology by Ambiq Micro Ultra-low supply current: - <15 nA with RC oscillator - <20 nA with RC oscillator and autocalibration - <55 nA with crystal oscillator Baseline timekeeping features: - 32 KHz crystal oscillator with integrated load capacitor/resistor - Counters for hundredths, seconds, minutes, hours, date, month, year, century, and weekday - Alarm capability on all counters - Programmable output clock generation (32 kHz to 1/year) - Countdown timer with repeat function - Automatic leap year calculation Advanced timekeeping features: - Integrated power optimized RC oscillator - Advanced crystal calibration to ± 2 ppm - Advanced RC calibration to ± 16 ppm - Automatic calibration of RC oscillator to crystal oscillator - Watchdog timer with hardware reset - Up to 256 bytes of general purpose RAM Power management features: - Integrated <1Ω power switch for off-chip components such as a host MCU - System sleep manager for managing host processor wake/sleep states - External interrupt monitor - External reset signal monitor - Reset output generator - Automatic switchover to VBAT - Supercapacitor trickle charger with programmable charging current - Programmable brown out detection - Programmable analog voltage comparator I2C (up to 400 kHz) or SPI (up to 2 MHz) serial interface - Supports 3-wire and 4-wire SPI Operating Voltage 1.7-3.6 V Clock and RAM retention voltage 1.5-3.6 V Operating temperature –40 to 85 °C All inputs include Schmitt triggers 3 mm x 3 mm QFN-16 package Applications Smart cards Wireless sensors and tags Medical electronics Utility meters Data loggers Appliances Handsets Consumer electronics Description The Abracon Corporation AB18XX Real Time Clock with Power Management family provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set. With power requirements significantly lower than any other industry RTC (as low as 15nA), these are the first semiconductor products based on Abracon Corporation’s innovative SPOT (Sub-threshold Power Optimized Technology by Ambiq Micro) CMOS platform. The AB18XX includes onchip oscillators to provide minimum power consumption, full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions, and either an I2C or SPI serial interface for communication with a host controller. An integrated power switch and a sophisticated system sleep manager with counter, timer, alarm, and interrupt capabilities allows the AB18XX to be used as a supervisory component in a host microcontroller-based system. AB18XX Series Real Time Clock Module 1. Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (1) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release Family Summary The AB18XX family consists of several members. All devices are supplied in a standard 3 mm x 3 mm QFN-16 package. Members of the software and pin compatible AB08XX RTC family are also listed. Part # AB1801-T3 Baseline Timekeeping Number XT of GP Osc Outputs 2 Advanced Timekeeping Power Management RC Osc Calib/ Auto-calib RA M (B) 0 64 Watchdog AB1803-T3 2 AB1804-T3 4 256 AB1805-T3 4 256 AB1811-T3 2 0 AB1813-T3 2 64 AB1814-T3 3 256 AB1815-T3 3 256 VBAT Switch Reset Mgmt Ext Int Interface I2C I2C I2C I2C SPI SPI Power Switch and Sleep FSM SPI SPI Software and Pin Compatible AB08XX Family Components AB0801-T3 2 0 AB0803-T3 2 AB0804-T3 4 256 AB0805-T3 4 256 AB0811-T3 2 AB0813-T3 2 AB0814-T3 3 256 AB0815-T3 3 256 64 I2C I2C I2C I2C 0 64 SPI SPI SPI SPI AB18XX Series Real Time Clock Module 2. Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (2) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release AB18XX Functional Description VCC VBAT nCE SDI SCL SDA/O Power Control Analog Compare I2C/SPI Interface Calibration Engine XO XT Osc Divider RC Osc Divider XI 100ths Seconds Minutes Hours Days Weekdays Months Years Alarms Timer WDT Control RAM WDI EXTI nEXTR Int/Clock Reset FOUT/nIRQ PSW/nIRQ2 nTIRQ CLKOUT/nIRQ3 nRST VSS The AB18XX serves as a companion part for host processors including microcontrollers, radios, and digital signal processors. It tracks time as in a typical RTC product and additionally provides unique power management functionality that makes it ideal for highly energy-constrained applications. To support such operation, the AB18XX includes 3 distinct feature groups: 1) baseline timekeeping features, 2) advanced timekeeping features, and 3) power management features. Functions from each feature group may be controlled via memory mapped registers. These registers are accessed using either an I2C serial interface (e.g., in the AB1805) or a SPI serial interface (e.g., in the AB1815). Each feature group is described briefly below. The baseline timekeeping feature group supports the standard 32 kHz crystal (XT) oscillation mode for maximum frequency accuracy with an ultra-low current draw of 55 nA. An extended calibration mode enables low jitter digital calibration to an accuracy of ±2 ppm over a range of -614 ppm to +244 ppm. The baseline timekeeping feature group also includes a standard set of counters monitoring hundredths of a second up through centuries. A complement of countdown timers and alarms may additionally be set to initiate interrupts or resets on several of the outputs. The advanced timekeeping feature group supports two additional oscillation modes: 1) RC oscillator mode, and 2) autocalibration mode. At only 15 nA, the temperature-compensated ±10% RC oscillator mode provides an even lower current draw than the XT oscillator for applications with reduced frequency accuracy requirements. A proprietary calibration algorithm allows the AB18XX to digitally tune the RC oscillator frequency with accuracy as low as ±2 ppm at a given temperature and very low calibration jitter. In autocalibration mode, the RC oscillator is used as the primary oscillation source and is periodically calibrated against the XT oscillator. Autocalibration may be executed every autocalibration period (ACP) of 8.5 minutes or 17 minutes and may also be initiated via software. This mode enables average current draw of only 20 nA with frequency accuracy similar to the XT oscillator. The advanced timekeeping feature group also includes a rich set of input and output configuration options that enables the monitoring of external interrupts (e.g., pushbutton signals), the generation of clock outputs, and watchdog timer functionality. AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (3) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release Power management features built into the AB18XX enable it to operate as a backup device in both line-powered and batterypowered systems. An integrated power control module automatically detects when main power (VCC) falls below a digitally-selectable threshold and switches to backup power (VBAT). Up to 256B of ultra-low leakage RAM enable the storage of key parameters when operating on backup power. The AB18XX is the first RTC to incorporate a number of more advanced power management features. In particular, the AB18XX includes a finite state machine (integrated with the Power Control block) that can control a host processor as it transitions between sleep/reset states and active states. Digital outputs can be configured to control the reset signal or interrupt input of the host controller with digitally-tunable timing. The AB18XX additionally integrates a power switch with <1 Ω impedance that can be used to cut off ground current on the host microcontroller and reduce sleep current to <1 nA. The AB18XX parts can wake-up a sleeping system using internally generated timing interrupts or externally generated interrupts generated by digital inputs (e.g., using a pushbutton). The aforementioned functionality enables users to seamlessly power down host processors, leaving only the energy-efficient AB18XX chip awake. The AB18XX also includes digitally-tunable voltage monitoring for brown-out detection and power-on reset. 3. AB18XX Example Applications The AB18XX enables a variety of system implementations in which the AB18XX can control power usage by other elements in the system. This is typically used when the entire system is powered from a battery and minimizing total power usage is critical. The backup RAM in the AB18XX can be used to hold key MCU parameters when it is powered down. 3.1 VSS Power Switched In the recommended implementation, the internal power switch of the AB18XX is used to completely turn off the MCU and/or other system elements. In this case the PSW/nIRQ2 output is configured to generate the Sleep function. Under normal circumstances, the PSW/nIRQ2pin is pulled to VSS with less than 1 ohm of resistance, so that the MCU receives full power. The MCU initiates a SLP operation, and when the AB18XX enters Sleep Mode the PSW/nIRQ2 pin is opened and power is completely removed from the MCU. This results in significant additional power savings relative to the other alternatives. A variety of interrupts, including alarms, timers and external interrupts created by a pushbutton as shown, may be used to exit Sleep Mode and restore MCU power. The RAM of the AB18XX may be used to retain critical MCU parameters. R EXTI AM18XX VCC AB18XX XO XI FOUT/nIRQ VCC I2C/SPI IRQ PSW/nIRQ2 VSS VSS MCU AB18XX Series Real Time Clock Module ESD Sensitive Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (4) of (13) Abracon Drawing # 3.2 Revision #: Initial Release VCC Power Switched An external transistor switch T may also be used to turn off power to the MCU. This implementation allows switching higher current and maintains a common ground. R can be on the order of megohms, so that negligible current is drawn when the circuit is active and PSW/nIRQ2 is low. T R AB18XX AM18XX VCC VCC I2C/SPI FOUT/nIRQ MCU IRQ PSW/nIRQ2 VSS 3.3 VSS Reset Driven In another implementation the AB18XX controls the system MCU using the reset function rather than switching power. Since many MCUs use much less power when reset, this implementation can save system power in some cases. VCC AB18XX AM18XX MCU nRST RESET VSS 3.4 VCC I2C/SPI VSS Battery Backup In many systems the main power supply is a battery, so the AB18XX can minimize its current draw by powering down the MCU and other peripherals. This battery may be replaceable, and a supercapacitor charged via the AB18XX trickle charger can maintain system time and key parameters when the main battery is removed. VBAT Backup Supercap XO XI VSS VCC VCC I2C/SPI AB18XX AM18XX FOUT/nIRQ MCU IRQ PSW/nIRQ2 VSS Main Battery AB18XX Series Real Time Clock Module 4. ESD Sensitive Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (5) of (13) Abracon Drawing # Revision #: Initial Release Package Pin Description The AB18XX package pins are described below. The thermal pad on the QFN-16 packages must be connected to VSS. All NC pins must be left unconnected. nTIRQ (1) FOUT/nIRQ EXTI (1) VSS (3) nRST (3) WDI (3) nEXTR PSW/nIRQ2 (1) CLKOUT/nIRQ3 VSS PAD 1 VSS PAD nCE FOUT/nIRQ EXTI (3) SDI (4) VBAT SDO SCL (3) CLKOUT/nIRQ3 1 (2) VBAT SDA SCL (1) nRST (1) WDI (1) nEXTR PSW/nIRQ2 XI XO VSS VCC AM181X AB181X XI XO VSS VCC AM180X AB180X (1)––Available AvailableininAB1804 AM1804 AM1805 (1) andand AB1805 only,only, else else NC NC (2) andand AB1805 only,only, else else VSSVSS (2)––Available AvailableininAB1803 AM1803 AM1805 (3) andand AB1815 only,only, else else NC NC (3)––Available AvailableininAB1814 AM1814 AM1815 (4) – Available in AB1813 and AB1815 only, else VSSVSS (4) – Available in AM1813 and AM1815 only, else Pin Name Pin Type Function VSS Power Ground VCC XI XO VBAT SCL SDO SDI nCE SDA EXTI WDI nEXTR FOUT/nIRQ PSW/nIRQ2 CLKOUT/nIRQ3 nTIRQ nRST Power XT XT Power Input Output Input Input Input Input Input Input Output Output Output Output Output System power supply Crystal input Crystal output Battery power supply I2C or SPI interface clock SPI data output SPI data input SPI chip select I2C data input/output External interrupt input Watchdog reset input External reset input Interrupt 1/function output Interrupt 2/power switch output Interrupt 3/clock output Timer interrupt output Reset output 01 5, 9, 14 13 16 15 7 6 11 4 Pin Number in AB18XX 03 04 05 11 13 14 5, 9, 9, 5, 5, 9, 14 14 14 14 14 14 13 13 13 13 13 13 16 16 16 16 16 16 15 15 15 15 15 15 5 5 5 7 7 7 7 7 7 6 6 6 9 9 9 12 12 12 6 6 6 10 10 10 2 2 2 3 3 3 11 11 11 11 11 11 4 4 4 4 4 4 8 8 8 12 12 1 1 1 15 14 13 16 15 5 7 6 9 12 10 2 3 11 4 8 1 AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (6) of (13) Abracon Drawing # 5. Electrical Specifications 5.1 Absolute Maximum Ratings ESD Sensitive Revision #: Initial Release All voltages referenced to VSS. SYMBOL VCC VBAT VI VI VO VO II IO 5.2 PARAMETER TEST CONDITIONS System Power Voltage Battery Voltage MIN TYP MAX UNIT -0.3 3.6 V -0.3 3.6 V Input voltage VCC > VMIN -0.3 VCC + 0.3 V Input voltage VCC < VMIN, VBAT > VMIN -0.3 VBAT + 0.3 V Output voltage VCC > VMIN -0.3 VCC + 0.3 V Output voltage VCC < VMIN, VBAT > VMIN -0.3 VBAT + 0.3 V Input current -1 1 mA Output current -1 1 mA CDM ±500 V HBM ±4000 V 100 mA -65 150 °C -40 85 °C 300 °C 260 °C MAX UNIT VESD ESD Voltage ILU TSTG TOP Latch-up Current Storage Temperature Operating Temperature TSLD Lead temperature TREF Reflow soldering temperature Hand soldering for 10 seconds Reflow profile per JEDEC J-STD-020D Operating Parameters TA = -40 °C to 85 °C, TYP values at 25 °C SYMBOL VCC PARAMETER System Power Voltage TEST CONDITIONS MIN 2 TYP SPI or I C active 1.7 3.6 V Clock operating + RAM 1.5 3.6 V 1.5 3.6 V VBAT Battery Voltage Clock operating + RAM VT+ Positive-going Input Threshold Voltage VCC = 3.0V 1.5 VCC = 1.8V 1.1 VT- Negative-going Input Threshold Voltage VCC = 3.0V 0.9 VCC = 1.8V 0.6 VOL Low level output voltage High level output voltage on push-pull outputs Power supply valid voltage 1.7V < VCC < 3.6V VOH VMIN 1.7V < VCC < 3.6V VSS V V 0.2•VCC 0.8•VCC 1.5 V VCC V V AB18XX Series Real Time Clock Module ESD Sensitive Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (7) of (13) Abracon Drawing # 5.3 Revision #: Initial Release Supply Current The current supplied into the VCC or VBAT power inputs under various conditions is shown below. TA = -40 °C to 85 °C, VBAT = 0 V to 3.6 V, TYP values at 25 °C SYMBOL IVCC:I2C IVCC:SPI IVCC:XT IVCC:RC IVCC:ACAL PARAMETER VCC supply current during I2C burst read/write VCC supply current during SPI burst read/write VCC supply current in XT oscillator mode. VCC supply current in RC oscillator mode. VCC supply current in autocalibrated RC oscillator mode. IVBAT:XT VBAT supply current in XT oscillator mode. IVBAT:RC VBAT supply current in RC oscillator mode. IVBAT:ACAL VBAT supply current in autocalibrated RC oscillator mode. IVBAT:VCC VBAT supply current in VCC powered mode. TEST CONDITIONS 400kHz bus speed, 10k pull-up resistors on SCL/SDA. (1) VCC VBAT 3.0V 1.8V Time keeping mode with XT oscillator running. (3) Time keeping mode with only the RC oscillator running (XT oscillator is off). (3) Time keeping mode with only RC oscillator running and autocalibration enabled. ACP = 512 seconds. (3) Time keeping mode with XT oscillator running. (3) Time keeping mode with only the RC oscillator running (XT oscillator is off). (3) Time keeping mode with only RC oscillator running and autocalibration enabled. ACP = 512 seconds. (3) VCC powered mode. (3) 1.8V NA < 1.5V < 1.5V < 1.5V > 1.5V 10 µA 5 µA 50 nA 15 NA 3.0V 1.8V UNIT 55 NA 3.0V 1.8V MA X 10 3.0V 1.8V TYP 20 NA 3.0V 2 MHz bus speed (2) MIN 12 nA 18 NA 15 3.0V 55 1.8V 50 3.0V 15 1.8V 12 3.0V 18 1.8V 15 3.0V 290 1.8V 190 nA nA nA nA pA (1) Excluding external peripherals and pull-up resistor current. All other inputs (besides SDA and SCL) are at 0V or VCC. AB080X and AB180X only. (2) Excluding external peripheral current. All other inputs (besides SDI, nCE and SCL) are at 0V or V CC. AB081X and AB181X only. (3) All inputs and outputs are at 0V or VCC. AB18XX Series Real Time Clock Module ESD Sensitive Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (8) of (13) Abracon Drawing # Revision #: Initial Release 6. Tape and Reel Information T (thickness) REEL DRAWING Detail A D C Detail A Detail B B Detail B L N R = 4 mm R = 4 mm G 5ᵒ W1 (inner width at HUB) A W3 (inner width at outer edge of reel) W2 (outer width at HUB) P2 P0 E1 K1 ø D1 F W B0 Detail A Y DETAIL A R 0. EF 35 3ᵒ REF K0 REF R0.65 R0 REF .6 0 CARRIER TAPE DRAWING ø D0 Y P1 A0 SECTION Y-Y 330 x 178 x 12 mm Reel Dimensions Symbol MIN TYP MAX Units T 2.3 2.5 2.7 N 178.0 L 330.0 W1 12.4 12.4 12.6 W2 18.4 W3 12.4 15.4 mm C 12.8 13.0 13.5 D 20.2 A 10.0 G 4.0 B 1.5 3x3 QFN Carrier Tape Dimensions Symbol MIN TYP MAX Units B0 3.2 3.3 3.4 K0 0.9 1.0 1.1 K1 0.25 0.3 0.35 D0 1.50 1.55 1.60 D1 1.5 P0 3.9 4.0 4.1 mm P1 7.9 8.0 8.1 P2 1.9 2.0 2.1 A0 3.2 3.3 3.4 E1 1.65 1.75 1.85 F 5.4 5.5 5.6 W 11.7 12.0 12.3 AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (9) of (13) Abracon Drawing # 7. Reflow Profile The AB18XX reflow soldering requirements are described below. Profile Feature Requirement Preheat/Soak Temperature Min (Tsmin) Temperature Max (Tsmax) Time (ts) from (Tsmin to Tsmax) 150 °C 200 °C 60-120 seconds Ramp-up rate (TL to Tp) 3 °C/second max. Liquidous temperature (T L) Time (tL) maintained above TL 217 °C 60-150 seconds Peak package body temperature (Tp) 260 °C max. Time (tp) within 5 °C of Tp 30 seconds max. Ramp-down rate (Tp to TL) 6 °C/second max. Time 25 °C to peak temperature 8 minutes max. ESD Sensitive Revision #: Initial Release AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (10) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release 8. Ordering Information AB18XX Orderable Part Numbers P/N AB1801-T3 AB1803-T3 AB1804-T3 AB1805-T3 AB1811-T3 AB1813-T3 AB1814-T3 AB1815-T3 Tape and Reel Qty 3000pcs/reel 3000pcs/reel 3000pcs/reel 3000pcs/reel 3000pcs/reel 3000pcs/reel 3000pcs/reel 3000pcs/reel Package Pb-Free(1) 16-Pin QFN 3 x 3 mm Temperature Range MSL Level(2) -40 to +85 °C 1 Notes: (1) Compliant and certified with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in raw homogeneous materials. The package was designed to be soldered at high temperatures (per reflow profile) and can be used in specified lead-free processes. (2) Moisture Sensitivity Level rating according to the JEDEC J-STD-020D industry standard classifications. AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (11) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release 9. Notes i) The parts are manufactured in accordance with this specification. If other conditions and specifications which are required for this specification, please contact ABRACON for more information. ii) ABRACON will supply the parts in accordance with this specification unless we receive a written request to modify prior to an order placement. iii) In no case shall ABRACON be liable for any product failure from in appropriate handling or operation of the item beyond the scope of this specification. iv) When changing your production process, please notify ABRACON immediately. ABRACON Corporation’s products are COTS – Commercial-Off-The-Shelf products; suitable for Commercial, Industrial and, where designated, Automotive Applications. ABRACON’s products are not specifically designed for Military, Aviation, Aerospace, Life-dependant Medical applications or any application requiring high reliability where component failure could result in loss of life and/or property. For applications requiring high reliability and/or presenting an extreme operating environment, written consent and authorization from ABRACON Corporation is required. Please contact ABRACON Corporation for more information. vi) All specifications and Marking will be subject to change without notice. v) 10. ABRACON CORPORATION – TERMS & CONDITIONS OF SALE PLEASE NOTE: Claims for pricing errors, shortages and defective products must be reported within 10 days from receipt of goods. Returned products will not be accepted after 30 days from the invoice date, and may be subject to restocking fees in accordance with Abracon Corporation’s return policy. Abracon standard product purchase orders may not be canceled within 60 days of original shipping date. Abracon non-standard product purchase orders are non-cancelable and non-returnable. All schedule changes must be requested prior to 30 days of original shipping date. 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Claims against AB AB18XX Series Real Time Clock Module Date of Issue: Sept. 10th, 2012 3.0 x 3.0 mm Page (12) of (13) Abracon Drawing # ESD Sensitive Revision #: Initial Release for shortages must be made in writing within ten days after the arrival of the shipment. AB is not required to notify the Buyer of the shipment. 5. Delivery: Shipping dates are approximate. 6. Packing: Unless otherwise specified, prices quoted herein include normal AB packaging. If special packaging is required by the Buyer, an additional charge will be made. 7. Inspection: Unless the Buyer notifies AB in writing within ten days from the date of receipt of any products that says the products are rejected, they will be deemed to have been accepted by the Buyer. In order for the notice of rejection to be effective, it must also specify the reasons why the products are being rejected. Any rejected products must be returned to AB within thirty days of rejection or the rejection shall be void and of no effect. 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