AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 1 of 37 Abracon Drawing #453568 Revision : A Features * Ultra-low supply current (all at 3V): - 14 nA with RC oscillator - 22 nA with RC oscillator and Autocalibration - 55 nA with crystal oscillator * Baseline timekeeping features: - 32.768 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 (32.768 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 ~1 power switch for off-chip components such as a host MCU - System sleep manager for managing host processor wake/sleep states - External reset signal monitor - Reset output generator - Supercapacitor trickle charger with programmable charging current - Automatic switchover to VBAT - External interrupt monitor - Programmable low battery detection threshold - Programmable analog voltage comparator * I2C (up to 400 kHz) and 3-wire or 4-wire SPI (up to 2 MHz) serial interfaces available * Operating voltage 1.5-3.6 V * Clock and RAM retention voltage 1.5-3.6 V * Operating temperature -40 to 85 C * All inputs include Schmitt Triggers * 3x3 mm QFN-16 package Applications * * * * * * * * * Smart cards Wireless sensors and tags Medical electronics Utility meters Data loggers Appliances Handsets Consumer electronics Communications equipment Description The ABRACON 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 14 nA), these are the first semiconductors based on innovative SPOTTM (Subthreshold Power Optimized Technology) CMOS platform. The AB18XX includes on-chip 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 AM18XX to be used as a supervisory component in a host microcontroller based system. Disclaimer: AB18XX series of devices are based on innovative SPOT technology, proprietary to Ambiq Micro. AB18XX Real-Time Clock with Power Management Family 1. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 2 of 37 Abracon Drawing #453568 Revision : A Family Summary The AB18XX family consists of several members (see Table 1). All devices are supplied in a standard 3x3 mm QFN-16 package. Members of the software and pin compatible AB18XX RTC family are also listed. Table 1: Family Summary Baseline Timekeeping Part # Advanced Timekeeping Power Management XT Osc Number of GP Outputs RC Osc Calib/ Autocalib AB1801 2 0 AB1803 2 64 AB1804 4 256 AB1805 4 256 AB1811 2 0 AB1813 2 64 AB1814 3 256 AB1815 3 256 Watchdog RAM (B) VBAT Switch Reset Mgmt Ext Int Interface I2 C I2 C I2 C I2 C SPI SPI Power Switch and Sleep FSM SPI SPI Software and Pin Compatible AB08XX Family Components AB0801 2 0 AB0803 2 64 AB0804 4 256 AB0805 4 256 AB0811 2 0 AB0813 2 64 AB0814 3 256 AB0815 3 256 I2 C I2 C I2 C I2 C SPI SPI SPI SPI AB18XX Real-Time Clock with Power Management Family 2. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 3 of 37 Abracon Drawing #453568 Revision : A Functional Description Figure 1 illustrates the AB18XX functional design. VCC VBAT nCE SDI SCL SDA/O I2C/SPI Interface Power Control Analog Compare Minutes Hours Days Weekdays Months Calibration Engine Years XO XT Osc Alarms Timer Divider WDT XI Control RC Osc Divider RAM WDI EXTI nEXTR 100ths Seconds Int/Clock Reset FOUT/nIRQ PSW/nIRQ2 nTIRQ CLKOUT/nIRQ3 nRST VSS Figure 1. Detailed Block Diagram 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 I/O offset 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 and in greater detail in subsequent sections. The baseline timekeeping feature group supports the standard 32.786 kHz crystal (XT) oscillation mode for maximum frequency accuracy with an ultra-low current draw of 55 nA. The baseline timekeeping feature group also includes a standard set of counters monitoring hundredths of a second up through centuries. A AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 4 of 37 Abracon Drawing #453568 Revision : 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 14 nA, the temperature-compensated 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 and the XT oscillator frequency with accuracy as low as 2 ppm at a given temperature. In Autocalibration mode, the RC oscillator is used as the primary oscillation source and is periodically calibrated against the XT oscillator. Autocalibration may be done automatically every 8.5 minutes or 17 minutes and may also be initiated via software. This mode enables average current draw of only 22 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. Power management features built into the AB18XX enable it to operate as a backup device in both linepowered and battery-powered systems. An integrated power control module automatically detects when main power (VCC) falls below a 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. VBAT power switching is included in the AB1803, AB1813, AB1813 and AB1815 parts only. 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 in Figure 1) 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. The AB18XX additionally integrates a power switch with ~1 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) or an analog comparator. The aforementioned functionality enables users to seamlessly power down host processors, leaving only the energy-efficient AB18XX chip awake. The AB18XX also includes voltage detection on the backup power supply. AB18XX Real-Time Clock with Power Management Family 3. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 5 of 37 Abracon Drawing #453568 Revision : A AB18XX Application Examples 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 AB18XX XO VCC VCC I2C/SPI FOUT/nIRQ MCU IRQ PSW/nIRQ2 XI VSS VSS 3.2 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 VCC FOUT/nIRQ VCC I2C/SPI IRQ PSW/nIRQ2 VSS VSS MCU AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 6 of 37 Abracon Drawing #453568 Revision : A 3.3 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. AB18XX VCC VCC I2C/SPI MCU nRST RESET VSS VSS 3.4 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. 1.5k* Backup Battery/ Supercap VBAT XO XI VSS VCC VCC I2C/SPI AB18XX FOUT/nIRQ MCU IRQ PSW/nIRQ2 VSS * Total battery series impedance = 1.5k ohms, which may require an external resistor AB18XX Real-Time Clock with Power Management Family 4. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 7 of 37 Abracon Drawing #453568 Revision : A Package Pins 4.1 Pin Configuration and Connections Figure 2 and Table 2 show the QFN-16 pin configurations for the AB18XX parts. Pins labeled NC must be left unconnected. The thermal pad, pin 17, on the QFN-16 packages must be connected to VSS. nTIRQ (1) FOUT/nIRQ VSS PAD EXTI (1) PSW/nIRQ2 (3) WDI AF VCC Available in AB1814 and AB1815 only, else NC (4) Available in AB1813 and AB1815 only, else VSS FOUT/nIRQ VSS PAD EXTI (3) PSW/nIRQ2 (4) VBAT SDI (1) CLKOUT/nIRQ3 SCL SDA Available in AB1803 and AB1805 only, else VSS (3) nCE (3) nEXTR VSS (2) VBAT 1 Available in AB1804 and AB1805 only, else NC (2) (3) CLKOUT/nIRQ3 (1) WDI (1) nEXTR (3) nRST SCL 1 XO XI VCC AF AB181X SDO (1) nRST XO XI AB180X (1) Figure 2. Pin Configuration Diagram Table 2: Pin Connections Pin Name Pin Number in AB18XX Pin Type Function 01 03 04 05 11 13 14 15 5,9,17 9,17 5,9,17 9,17 5,17 17 5,17 17 VSS Power Ground VCC Power System power supply 13 13 13 13 13 13 13 13 XI XT Crystal input 16 16 16 16 16 16 16 16 XO XT Crystal output 15 15 15 15 15 15 15 15 AF Output Autocalibration filter 14 14 14 14 14 14 14 14 VBAT Power Battery power supply SCL Input I2C or SPI interface clock SDO Output SDI nCE 5 7 7 SPI data output 6 6 6 6 Input SPI data input 9 9 9 9 Input SPI chip select 12 12 12 12 Input I C data input/output EXTI Input WDI 6 6 7 7 5 7 SDA 7 5 7 2 7 5 6 6 External interrupt input 10 10 10 10 Input Watchdog reset input 2 2 2 2 nEXTR Input External reset input 3 3 3 3 FOUT/nIRQ Output Int 1/function output 11 11 11 11 11 11 11 11 nIRQ2 Output Int 2 output 4 4 4 4 4 4 4 4 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 8 of 37 Abracon Drawing #453568 Revision : A Table 2: Pin Connections Pin Number in AB18XX Pin Type Function CLKOUT/nIRQ3 Output nTIRQ nRST Pin Name 01 03 04 05 Int 3/clock output 8 8 Output Timer interrupt output 12 12 Output Reset output 1 1 11 13 14 15 8 8 1 1 4.2 Pin Descriptions Table 3 provides a description of the pin connections. Table 3: Pin Descriptions Pin Name Description VSS Ground connection. In the QFN-16 packages the ground slug on the bottom of the package must be connected to VSS. VCC Primary power connection. If a single power supply is used, it must be connected to VCC. VBAT Battery backup power connection. If a backup battery is not present, VBAT is normally left floating or grounded, but it may also be used to provide the analog input to the internal comparator (see AnalogComparator). XI Crystal oscillator input connection. XO Crystal oscillator output connection. AF Autocalibration filter connection. A 47pF ceramic capacitor should be placed between this pin and VSS for improved Autocalibration mode timing accuracy. SCL I/O interface clock connection. It provides the SCL input in both I2C and SPI interface parts. SDA (only available in I2C environments) I/O interface I2C data connection. SDO (only available in SPI environments) I/O interface SPI data output connection. SDI I/O interface SPI data input connection. nCE (only available in SPI environments) I/O interface SPI chip select input connection. It is an active low signal. A pull-up resistor is recommended to be connected to this pin to ensure it is not floating. A pull-up resistor also prevents inadvertent writes to the RTC during power transitions. EXTI External interrupt input connection. It may be used to generate an External 1 interrupt with polarity selected by the EX1P bit if enabled by the EX1E bit. The value of the EXTI pin may be read in the EXIN register bit. This pin does not have an internal pull resistor. It must not be left floating or the RTC may consume higher current. WDI Watchdog Timer reset input connection. It may also be used to generate an External 2 interrupt with polarity selected by the EX2P bit if enabled by the EX2E bit. The value of the WDI pin may be read in the WDIN register bit. This pin does not have an internal pull resistor. It must not be left floating or the RTC may consume higher current. nEXTR External reset input connection. If nEXTR is low and the RS1E bit is set, the nRST output will be driven to its asserted value as determined by the RSP bit. This pin does not have an internal pull resistor. It must not be left floating or the RTC may consume higher current. AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 9 of 37 Abracon Drawing #453568 Revision : A Table 3: Pin Descriptions Pin Name Description Primary interrupt output connection. FOUT/nIRQ may be configured to generate several signals as a function of the OUT1S field(see 0x11 - Control2). FOUT/nIRQ is also asserted low on a power up until the AB18XX has exited the reset state and is accessible via the I/O interface. FOUT/nIRQ 1. 2. 3. 4. FOUT/nIRQ can drive the value of the OUT bit. FOUT/nIRQ can drive the inverse of the combined interrupt signal IRQ (see Interrupts). FOUT/nIRQ can drive the square wave output (see 0x13 - SQW) if enabled by SQWE. FOUT/nIRQ can drive the inverse of the alarm interrupt signal AIRQ (see Interrupts). Secondary interrupt output connection. It is an open drain output. PSW/nIRQ2 may be configured to generate several signals as a function of the OUT2S field (see 0x11 - Control2). This pin will be configured as an ~1 switch if the PWR2 bit is set. PSW/nIRQ2 nTIRQ (only available in I2C environments) CLKOUT/nIRQ3 nRST 1. 2. 3. 4. 5. 6. PSW/nIRQ2 can drive the value of the OUTB bit. PSW/nIRQ2 can drive the square wave output (see 0x13 - SQW) if enabled by SQWE. PSW/nIRQ2 can drive the inverse of the combined interrupt signal IRQ(see Interrupts). PSW/nIRQ2 can drive the inverse of the alarm interrupt signal AIRQ(see Interrupts). PSW/nIRQ2 can drive either sense of the timer interrupt signal TIRQ. PSW/nIRQ2 can function as the power switch output for controlling the power of external devices (see Sleep Control). Timer interrupt output connection. It is an open drain output. nTIRQ always drives the active low nTIRQ signal. Square Wave output connection. It is a push-pull output, and may be configured to generate one of two signals. 1. 2. CLKOUT/nIRQ3 can drive the value of the OUT bit. CLKOUT/nIRQ3 can drive the square wave output (see 0x13 - SQW) if enabled by SQWE. External reset output connection. It is an open drain output. The polarity is selected by the RSP bit, which will initialize to 0 on power up to produce an active low output. See Autocalibration Fail Interrupt ACIRQ for details of the generation of nRST. AB18XX Real-Time Clock with Power Management Family 5. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 10 of 37 Abracon Drawing #453568 Revision : A Electrical Specifications 5.1 Absolute Maximum Ratings Table 4 lists the absolute maximum ratings. Table 4: Absolute Maximum Ratings SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VCC System Power Voltage -0.3 3.8 V VBAT Battery Voltage -0.3 3.8 V VI Input voltage VCC Power state -0.3 VCC+ 0.3 V VI Input voltage VBAT Power state -0.3 VBAT+ 0.3 V VO Output voltage VCC Power state -0.3 VCC+ 0.3 V VO Output voltage VBAT Power state -0.3 VBAT+ 0.3 V II Input current -10 10 mA IO Output current -20 20 mA IOPC PSW Output continuous current 50 mA IOPP PSW Output pulsed current 1 second pulse 150 mA VESD CDM 500 V ESD Voltage HBM 4000 V ILU Latch-up Current 100 mA TSTG Storage Temperature -55 125 C TOP Operating Temperature -40 85 C TSLD Lead temperature Hand soldering for 10 seconds 300 C TREF Reflow soldering temperature Reflow profile per JEDEC JSTD-020D 260 C AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 11 of 37 Abracon Drawing #453568 Revision : A 5.2 Power Supply Parameters Figure 3 and Table 5 describe the power supply and switchover parameters. See Power Control and Switching for a detailed description of the operations. VCC VCCST VBAT Power State VCCST VCCRST VCCSWR VCCSWF VCCSWF VBATSW POR VBATRST VCC Power POR VCC Power VBAT Power VCC Power VBAT Power POR Figure 3. Power Supply Switchover For Table 5, TA = -40 C to 85 C, TYP values at 25 C. Table 5: Power Supply and Switchover Parameters SYMBO L PARAMETER PWR TYPE POWER STATE TEST CONDITIONS MIN TYP MAX UNIT VCC System Power Voltage VCC Static VCC Power Clocks operating and RAM and registers retained 1.5 3.6 V VCCIO VCC I/O Interface Voltage VCC Static VCC Power I2C or SPI operation 1.5 3.6 V VCCST VCC Start-up Voltage(1) VCC Rising POR -> VCC Power VCCRST VCC Reset Voltage VCC Falling VCC Power -> POR VBAT < VBAT,MIN or no VBAT 1.3 1.5 V VCCSWR VCC Rising Switch-over Threshold Voltage VCC Rising VBAT Power -> VCC Power VBAT VBATRST 1.6 1.7 V VCCSWF VCC Falling Switch-over Threshold Voltage VCC Falling VCC Power -> VBAT Power VBAT VBATSW,MIN VCC Hyst. VCC Power <-> VBAT Power VCC Falling VCC Power -> VBAT Power VCC < VCCSW,MAX 0.7 VBAT Static VBAT Power Clocks operating and RAM and registers retained 1.4 3.6 V VBAT Static VCC Power -> VBAT Power 1.6 3.6 V VCCSWH VCCFS VBAT VBATSW VCC Switchover Threshold Hysteresis(2) VCC Falling Slew Rate to switch to VBAT state(4) Battery Voltage Battery Switchover Voltage Range(5) 1.6 1.2 V 1.5 V 70 mV 1.4 V/ms AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 12 of 37 Abracon Drawing #453568 Revision : A Table 5: Power Supply and Switchover Parameters SYMBO L PARAMETER Falling Battery POR Volt- VBATRST age(7) VBAT VBMRG VCC Margin above (3) VBAT supply series resis- VBATESR tance(6) TEST CONDITIONS PWR TYPE POWER STATE VBAT Falling VBAT POR VBAT Static VBAT Power 200 VBAT Static VBAT Power 1.0 Power -> MIN VCC < VCCSWF TYP MAX UNIT 1.1 1.4 V mV 1.5 k (1) VCC must be above VCCST to exit the POR state, independent of the VBAT voltage. (2) Difference between V CCSWR and VCCSWF. (3) V BAT must be higher than VCC by at least this voltage to ensure the AB18XX remains (4) in the VBAT Power state. Maximum VCC falling slew rate to guarantee correct switchover to VBAT Power state. There is no VCC falling slew rate requirement if switching to the VBAT power source is not required. (5) V BAT voltage to guarantee correct transition to VBAT Power state when VCC falls. (6) Total series resistance of the power source attached to the VBAT pin. The optimal value is 1.5k, which may require an external resistor. VBAT power source ESR + external resistor value = 1.5k (7) VBATRST is also the static voltage required on VBAT for register data retention. 5.3 Operating Parameters Table 6 lists the operating parameters. For Table 6, TA = -40 C to 85 C, TYP values at 25 C. Table 6: Operating Parameters SYMBOL PARAMETER TEST CONDITIONS VCC MIN TYP MAX VT+ Positive-going Input Threshold Voltage 3.0V 1.5 2.0 1.8V 1.1 1.25 VT- Negative-going Input Threshold Voltage 3.0V 0.8 0.9 1.8V 0.5 0.6 IILEAK Input leakage current 3.0V CI Input capacitance VOH High level output voltage on push-pull outputs 1.7V - 3.6V VOL Low level output voltage 1.7V - 3.6V IOH High level output current on push-pull outputs 0.02 V V 80 3 VOH = 0.8VCC UNIT nA pF 0.8*VCC V 0.2*VCC 1.7V -2 -3.8 1.8V -3 -4.3 3.0V -7 -11 3.6V -8.8 -15 V mA AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 13 of 37 Abracon Drawing #453568 Revision : A Table 6: Operating Parameters SYMBOL IOL RDSON IOLEAK PARAMETER Low level output current PSW output resistance to VSS Output leakage current TEST CONDITIONS VOL = 0.2VCC PSW Enabled VCC MIN TYP 1.7V 3.3 5.9 1.8V 6.1 6.9 3.0V 17 19 3.6V 18 20 MAX UNIT mA 1.7V 1.7 5.8 1.8V 1.6 5.4 3.0V 1.1 3.8 3.6V 1.05 3.7 0.02 80 nA AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 14 of 37 Abracon Drawing #453568 Revision : A 5.4 Oscillator Parameters Table 7 lists the oscillator parameters. For Table 7, TA = -40 C to 85 C unless otherwise indicated. VCC = 1.7 to 3.6V, TYP values at 25 C and 3.0V. Table 7: Oscillator Parameters SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT FXT XI and XO pin Crystal Frequency 32.768 kHz FOF XT Oscillator failure detection frequency 8 kHz CINX Internal XI and XO pin capacitance 1 pF CEX External XI and XO pin PCB capacitance 1 pF OAXT XT Oscillation Allowance 320 k 128 Hz FRCC FRCU JRCCC quency(1) Factory Calibrated at 25C, VCC = 2.8V Uncalibrated RC Oscillator Frequency Calibration Disabled (OFFSETR = 0) RC Oscillator cycle-to-cycle jitter XT mode digital calibration AXT accuracy(1) AAC TAC Calibrated RC Oscillator Fre- At 25C using a 32.768 kHz crystal 270 89 122 Calibration Disabled (OFFSETR = 0) - 128 Hz 2000 Calibration Disabled (OFFSETR = 0) - 1 Hz 500 Calibrated at an initial temperature and voltage -2 2 24 hour run time 35 1 week run time 20 TA = -10C to 60C(1) 1 month run time 10 1 year run time 3 ing temperature(2) Hz ppm Autocalibration mode timing accuracy, 512 second period, Autocalibration mode operat- 220 -10 ppm ppm 60 C (1) Timing accuracy is specified at 25C after digital calibration of the internal RC oscillator and 32.768 kHz crystal. A typical 32.768 kHz tuning fork crystal has a negative temperature coefficient with a parabolic frequency deviation, which can result in a change of up to 150 ppm across the entire operating temperature range of -40C to 85C in XT mode. Autocalibration mode timing accuracy is specified relative to XT mode timing accuracy from -10C to 60C. (2) Outside of this temperature range, the RC oscillator frequency change due to temperature may be outside of the allowable RC digital calibration range (+/-12%) for autocalibration mode. When this happens, an autocalibration failure will occur and the ACF interrupt flag is set. The AB18XX should be switched to use the XT oscillator as its clock source when this occurs. Please see the Autocalibration Fail section for more details. AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 15 of 37 Abracon Drawing #453568 Revision : A Figure 4 shows the typical calibrated RC oscillator frequency variation vs. temperature. RC oscillator calibrated at 2.8V, 25C. 150 TA = 25 C 145 RC Frequency (Hz) 140 135 VCC = 1.8V 130 VCC = 3.0V 125 120 40 30 20 115 10 0 10 20 30 40 Temperature (C) 50 60 70 80 Figure 4. Calibrated RC Oscillator Typical Frequency Variation vs. Temperature Figure 5 shows the typical uncalibrated RC oscillator frequency variation vs. temperature. 145 TA = 25 C RC Frequency (Hz) 140 135 130 VCC = 1.8V 125 VCC = 3.0V 120 40 30 20 115 10 0 10 20 30 40 Temperature (C) 50 60 70 80 Figure 5. Uncalibrated RC Oscillator Typical Frequency Variation vs. Temperature AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 16 of 37 Abracon Drawing #453568 Revision : A 5.5 VCC Supply Current Table 8 lists the current supplied into the VCC power input under various conditions. For Table 8, TA = -40 C to 85 C, VBAT = 0 V to 3.6 V TYP values at 25 C, MAX values at 85 C, VCC Power state Table 8: VCC Supply Current SYMBOL PARAMETER TEST CONDITIONS VCC IVCC:I2C VCC supply current during I2C burst read/write 400kHz bus speed, 2.2k pull-up resistors on SCL/SDA(1) IVCC:SPIW VCC supply current during SPI burst write 2 MHz bus speed (2) IVCC:SPIR VCC supply current during SPI burst read 2 MHz bus speed (2) IVCC:XT VCC supply current in XT oscillator mode IVCC:RC VCC supply current in RC oscillator mode IVCC:ACAL Average VCC supply current in Autocalibrated RC oscillator mode IVCC:CK32 Additional VCC supply current with CLKOUT at 32.786 kHz IVCC:CK128 Additional VCC supply current with CLKOUT at 128 Hz TYP MAX 3.0V 6 10 1.8V 1.5 3 3.0V 8 12 1.8V 4 6 3.0V 23 37 1.8V 13 21 Time keeping mode with XT 3.0V 55 330 oscillator running(3) 1.8V 51 290 Time keeping mode with only the RC oscillator running (XT 3.0V 14 220 oscillator is off)(3) 1.8V 11 170 Time keeping mode with only RC oscillator running and Autocalibration enabled. ACP = 3.0V 22 235 1.8V 18 190 Time keeping mode with XT oscillator running, 32.786 kHz 3.0V 3.6 8 square wave on CLKOUT(4) 1.8V 2.2 5 All time keeping modes, 128 Hz 3.0V 7 35 square wave on CLKOUT(4) 1.8V 2.5 20 512 seconds(3) MIN (1) Excluding UNIT external peripherals and pull-up resistor current. All other inputs (besides SDA and SCL) are at 0V or VCC. AB180X only. Test conditions: Continuous burst read/write, 0x55 data pattern, 25 s between each data byte, 20 pF load on each bus pin. (2) Excluding external peripheral current. All other inputs (besides SDI, nCE and SCL) are at 0V or VCC. AB181X only. Test conditions: Continuous burst write, 0x55 data pattern, 25 s between each data byte, 20 pF load on each bus pin. (3) All inputs and outputs are at 0 V or VCC. (4) All inputs and outputs except CLKOUT are at 0 V or VCC. 15 pF capacitive load on CLKOUT. A A A nA nA nA A nA AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 17 of 37 Abracon Drawing #453568 Revision : A Figure 6 shows the typical VCC power state operating current vs. temperature in XT mode. VCC Power State, XT Mode Current (nA) 130 TA = 25 C 120 110 100 90 80 VCC = 3.0V 70 60 VCC = 1.8V 50 40 40 30 20 10 0 10 20 30 40 Temperature (C) 50 60 70 80 Figure 6. Typical VCC Current vs. Temperature in XT Mode Figure 7 shows the typical VCC power state operating current vs. temperature in RC mode. VCC Power State, RC Mode Current (nA) 75 TA = 25 C 65 55 45 35 VCC = 3.0V 25 VCC = 1.8V 15 5 40 30 20 10 0 10 20 30 40 Temperature (C) 50 60 70 Figure 7. Typical VCC Current vs. Temperature in RC Mode 80 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 18 of 37 Abracon Drawing #453568 Revision : A Figure 8 shows the typical VCC power state operating current vs. temperature in RC Autocalibration mode. 55 VCC Power State, Autocal Mode Current (nA) TA = 25 C 50 45 40 35 30 VCC = 3.0V 25 20 VCC = 1.8V 15 10 5 40 30 20 10 0 10 20 30 40 50 60 70 Temperature (C) Figure 8. Typical VCC Current vs. Temperature in RC Autocalibration Mode Figure 9 shows the typical VCC power state operating current vs. voltage for XT Oscillator and RC Oscillator modes and the average current in RC Autocalibrated mode. 70 TA = 25 C VCC Power State Current (nA) 60 XT Oscillator Mode 50 40 30 RC Autocalibrated Mode 20 10 RC Oscillator Mode 0 1.5 2 2.5 3 3.5 VCC Voltage (V) Figure 9. Typical VCC Current vs. Voltage, Different Modes of Operation AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 19 of 37 Abracon Drawing #453568 Revision : A Figure 10 shows the typical VCC power state operating current during continuous I2C and SPI burst read and write activity. Test conditions: TA = 25 C, 0x55 data pattern, 25 s between each data byte, 20 pF load on each bus pin, pull-up resistor current not included. 30 TA = 25 C VCC Current (A) 25 20 SPI Burst Read 15 10 SPI Burst Write 5 I2 C Burst Read/Write 0 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 VCC Voltage (V) Figure 10. Typical VCC Current vs. Voltage, IC and SPI Burst Read/Write 3.6 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 20 of 37 Abracon Drawing #453568 Revision : A Figure 11 shows the typical VCC power state operating current with a 32.768 kHz clock output on the CLKOUT pin. Test conditions: TA = 25 C, All inputs and outputs except CLKOUT are at 0 V or VCC. 15 pF capacitive load on the CLKOUT pin. 5 TA = 25 C VCC Current (A) 4 3 2 1 0 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 VCC Voltage (V) Figure 11. Typical VCC Current vs. Voltage, 32.768 kHz Clock Output 3.6 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 21 of 37 Abracon Drawing #453568 Revision : A 5.6 VBAT Supply Current Table 9 lists the current supplied into the VBAT power input under various conditions. For Table 9, TA = -40 C to 85 C, TYP values at 25 C, MAX values at 85 C, VBAT Power state. Table 9: VBAT Supply Current SYMBOL PARAMETER TEST CONDITIONS IVBAT:XT VBAT supply current in XT oscillator mode Time keeping mode with IVBAT:RC VBAT supply current in RC oscillator mode IVBAT:ACAL Average VBAT supply current in Autocalibrated RC oscillator mode IVBAT:VCC (1) VBAT supply current in VCC powered mode XT oscillator running(1) Time keeping mode with only the RC oscillator running (XT oscillator is off)(1) Time keeping mode with the RC oscillator running. Autocalibration enabled. VCC VBAT < VCCSWF < VCCSWF < VCCSWF ACP = 512 seconds(1) VCC powered mode(1) 1.7 - 3.6 V MIN TYP MAX 3.0V 56 330 1.8V 52 290 3.0V 16 220 1.8V 12 170 3.0V 24 235 1.8V 20 190 3.0V -5 0.6 20 1.8V -10 0.5 16 Test conditions: All inputs and outputs are at 0 V or VCC. Figure 12 shows the typical VBAT power state operating current vs. temperature in XT mode. VBAT Power State, XT Mode Current (nA) 130 TA = 25 C 120 110 100 90 80 VBAT = 3.0V 70 60 VBAT = 1.8V 50 40 40 30 20 10 0 10 20 30 40 50 60 70 Temperature (C) Figure 12. Typical VBAT Current vs. Temperature in XT Mode 80 UNIT nA nA nA nA AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 22 of 37 Abracon Drawing #453568 Revision : A Figure 13 shows the typical VBAT power state operating current vs. temperature in RC mode. VBAT Power State, RC Mode Current (nA) 75 TA = 25 C 65 55 45 35 VBAT = 3.0V 25 VBAT = 1.8V 15 5 40 30 20 10 0 10 20 30 40 50 60 70 80 Temperature (C) Figure 13. Typical VBAT Current vs. Temperature in RC Mode Figure 14 shows the typical VBAT power state operating current vs. temperature in RC Autocalibration mode. VBAT Power State, Autocal Mode Current (nA) 55 TA = 25 C 50 45 40 35 30 VBAT = 3.0V 25 20 VBAT = 1.8V 15 10 5 40 30 20 10 0 10 20 30 40 50 60 70 Temperature (C) Figure 14. Typical VBAT Current vs. Temperature in RC Autocalibration Mode AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 23 of 37 Abracon Drawing #453568 Revision : A Figure 15 shows the typical VBAT power state operating current vs. voltage for XT Oscillator and RC Oscillator modes and the average current in RC Autocalibrated mode, VCC = 0 V. 70 TA = 25 C VBAT Current (nA) 60 50 XT Oscillator Mode 40 30 RC Autocalibrated Mode 20 10 RC Oscillator Mode 0 1.5 2 2.5 VBAT Voltage (V) 3 3.5 Figure 15. Typical VBAT Current vs. Voltage, Different Modes of Operation Figure 16 shows the typical VBAT current when operating in the VCC power state, VCC = 1.7 V. 0.9 TA = 25 C, VCC = 1.7 V 0.8 VBAT Current (nA) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1.5 2 2.5 VBAT Voltage (V) 3 Figure 16. Typical VBAT Current vs. Voltage in VCC Power State 3.5 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 24 of 37 Abracon Drawing #453568 Revision : A 5.7 BREF Electrical Characteristics Table 10 lists the parameters of the VBAT voltage thresholds. BREF values other than those listed in the table are not supported. For Table 10, TA = -20 C to 70 C, TYP values at 25 C, VCC = 1.7 to 3.6V. Table 10: BREF Parameters SYMBOL VBRF PARAMETER VBAT falling threshold BREF MIN TYP MAX 0111 2.3 2.5 3.3 1011 1.9 2.1 2.8 1101 1.6 1.8 2.5 1111 VBRR VBRH TBR VBAT rising threshold VBAT threshold hysteresis VBAT analog comparator recommended operating temperature range V 1.4 0111 2.6 3.0 3.4 1011 2.1 2.5 2.9 1101 1.9 2.2 2.7 1111 1.6 0111 0.5 1011 0.4 1101 0.4 1111 0.2 All values UNIT -20 5.8 IC AC Electrical Characteristics Figure 17 and Table 11 describe the I2C AC electrical parameters. V V 70 C AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 25 of 37 Abracon Drawing #453568 Revision : A SDA tBUF tLOW tHD:DAT tSU:DAT SCL tHD:STA tRISE tFALL tHIGH tSU:STO tSU:STA SDA Figure 17. IC AC Parameter Definitions For Table 11, TA = -40 C to 85 C, TYP values at 25 C. Table 11: IC AC Electrical Parameters SYMBOL PARAMETER VCC MIN TYP MAX UNIT 400 kHz fSCL SCL input clock frequency 1.7V-3.6V 10 tLOW Low period of SCL clock 1.7V-3.6V 1.3 s tHIGH High period of SCL clock 1.7V-3.6V 600 ns tRISE Rise time of SDA and SCL 1.7V-3.6V 300 ns tFALL Fall time of SDA and SCL 1.7V-3.6V 300 ns tHD:STA START condition hold time 1.7V-3.6V 600 ns tSU:STA START condition setup time 1.7V-3.6V 600 ns tSU:DAT SDA setup time 1.7V-3.6V 100 ns tHD:DAT SDA hold time 1.7V-3.6V 0 ns tSU:STO STOP condition setup time 1.7V-3.6V 600 ns tBUF Bus free time before a new transmission 1.7V-3.6V 1.3 s 5.9 SPI AC Electrical Characteristics Figure 18, Figure 19, and Table 12 describe the SPI AC electrical parameters. AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 26 of 37 Abracon Drawing #453568 tBUF nCE tSU:NCE tHD:NCE tLOW tSU:CE tFALL tHIGH SCL tSU:SDI tHD:SDI MSB IN SDI tRISE LSB IN Figure 18. SPI AC Parameter Definitions - Input nCE SCL tSU:SDO SDO tHD:SDO MSB OUT tHZ LSB OUT SDI ADDR LSB Figure 19. SPI AC Parameter Definitions - Output Revision : A For Table 12, TA = -40 C to 85 C, TYP values at 25 C. AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 27 of 37 Abracon Drawing #453568 Revision : A Table 12: SPI AC Electrical Parameters SYMBOL PARAMETER VCC MIN TYP MAX UNIT 2 MHz fSCL SCL input clock frequency 1.7V-3.6V 0.01 tLOW Low period of SCL clock 1.7V-3.6V 200 ns tHIGH High period of SCL clock 1.7V-3.6V 200 ns tRISE Rise time of all signals 1.7V-3.6V 1 s tFALL Fall time of all signals 1.7V-3.6V 1 s tSU:NCE nCE low setup time to SCL 1.7V-3.6V 200 ns tHD:NCE nCE hold time to SCL 1.7V-3.6V 200 ns tSU:CE nCE high setup time to SCL 1.7V-3.6V 200 ns tSU:SDI SDI setup time 1.7V-3.6V 40 ns tHD:SDI SDI hold time 1.7V-3.6V 50 ns tSU:SDO SDO output delay from SCL 1.7V-3.6V tHD:SDO SDO output hold from SCL 1.7V-3.6V tHZ SDO output Hi-Z from nCE 1.7V-3.6V tBUF nCE high time before a new transmission 1.7V-3.6V 150 0 ns 250 200 ns ns ns AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 28 of 37 Abracon Drawing #453568 Revision : A 5.10 Power On AC Electrical Characteristics Figure 20 and Table 13 describe the power on AC electrical characteristics for the FOUT pin and XT oscillator. VCC tLOW:VCC VCCRST VCCST tVH:FOUT FOUT tVL:FOUT tXTST XT Figure 20. Power On AC Electrical Characteristics For Table 13, TA = -40 C to 85 C, VBAT < 1.2 V Table 13: Power On AC Electrical Parameters SYMBOL tLOW:VCC tVL:FOUT tVH:FOUT tXTST PARAMETER Low period of VCC to ensure a valid POR VCC low to FOUT low VCC high to FOUT high FOUT high to XT oscillator start VCC 1.7V-3.6V 1.7V-3.6V 1.7V-3.6V 1.7V-3.6V TA MIN TYP 85 C 0.1 25 C 0.1 -20 C 1.5 -40 C 10 85 C 0.1 25 C 0.1 -20 C 1.5 -40 C 10 85 C 0.4 25 C 0.5 -20 C 3 -40 C 20 85 C 0.4 25 C 0.4 -20 C 0.5 -40 C 1.5 MAX UNIT s s s s AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 29 of 37 Abracon Drawing #453568 Revision : A 5.11 nRST AC Electrical Characteristics Figure 21 and Table 14 describe the nRST and nEXTR AC electrical characteristics. tLOW:VCC VCC VCCRST VCCST tRL:NRST tVH:NRST nRST tVL:NRST tRH:NRST nEXTR Figure 21. nRST AC Parameter Characteristics For Table 14, TA = -40 C to 85 C, TYP at 25 C unless specified otherwise, VBAT < 1.2 V. Table 14: nRST AC Electrical Parameters SYMBOL tLOW:VCC tVL:NRST tVH:NRST PARAMETER Low period of VCC to ensure a valid POR VCC low to nRST low VCC high to nRST high VCC 1.7V-3.6V 1.7V-3.6V 1.7V-3.6V TA MIN TYP 85 C 0.1 25 C 0.1 -20 C 1.5 -40 C 10 85 C 0.1 25 C 0.1 -20 C 1.5 -40 C 10 85 C 0.5 25 C 0.5 -20 C 3.5 -40 C 25 MAX UNIT s s s tRL:NRST nEXTR low to nRST low 1.7V-3.6V -40 C to 85 C 30 50 ns tRH:NRST nEXTR high to nRST high 1.7V-3.6V -40 C to 85 C 50 80 ns AB18XX Real-Time Clock with Power Management Family 6. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 30 of 37 Abracon Drawing #453568 Revision : A 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 5? W1 (inner width at HUB) A W3 (inner width at outer edge of reel) W2 (outer width at HUB) P2 P0 E1 K1 o D1 F W B0 SECTION YY Detail A Y DETAIL A R 0. EF 35 3? REF K0 REF R0.65 R0 REF .6 0 CARRIER TAPE DRAWING o D0 Y P1 A0 AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 31 of 37 Abracon Drawing #453568 Revision : A Table 15: Tape and Reel Dimensions 330 x 178 x 12 mm Reel Dimensions Symbol MIN TYP MAX T 2.3 2.5 2.7 N Units Symbol MIN TYP MAX B0 3.2 3.3 3.4 K0 0.9 1.0 1.1 330.0 K1 0.25 0.3 0.35 12.6 D0 1.50 1.55 1.60 18.4 D1 1.5 P0 3.9 4.0 4.1 P1 7.9 8.0 8.1 P2 1.9 2.0 2.1 178.0 L W1 3x3 QFN Carrier Tape Dimensions 12.4 12.4 W2 W3 12.4 C 12.8 D 20.2 15.4 13.0 13.5 mm A 10.0 A0 3.2 3.3 3.4 G 4.0 E1 1.65 1.75 1.85 F 5.4 5.5 5.6 W 11.7 12.0 12.3 B 1.5 Units mm AB18XX Real-Time Clock with Power Management Family 7. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 32 of 37 Abracon Drawing #453568 Reflow Profile Figure 22 illustrates the reflow soldering requirements. Figure 22. Reflow Soldering Diagram Table 16: Reflow Soldering Requirements Profile Feature Preheat/Soak Temperature Min (Tsmin) Temperature Max (Tsmax) Time (ts) from (Tsmin to Tsmax) Requirement 150 C 200 C 60-120 seconds Ramp-up rate (TL to Tp) 3 C/second max. Liquidous temperature (TL) 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. Revision : A AB18XX Real-Time Clock with Power Management Family 8. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 33 of 37 Abracon Drawing #453568 Revision : A Ordering Information Table 17: Ordering Information AB18XX Orderable Part Numbers P/N Tape and Reel Qty AB1801-T3 3000pcs/reel AB1803-T3 3000pcs/reel AB1804-T3 3000pcs/reel AB1805-T3 3000pcs/reel AB1811-T3 3000pcs/reel AB1813-T3 3000pcs/reel AB1814-T3 3000pcs/reel AB1815-T3 3000pcs/reel Package Temperature Range MSL Level(2) Pb-Free(1) 16-Pin QFN 3 x 3 mm -40 to +85 oC 1 (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 Real-Time Clock with Power Management Family 9. i. ii. iii. iv. v. vi. Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 34 of 37 Abracon Drawing #453568 Revision : A Notes 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. ABRACON will supply the parts in accordance with this specification unless we receive a written request to modify prior to an order placement. 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. 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. All specifications and Marking will be subject to change without notice. AB18XX Real-Time Clock with Power Management Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 35 of 37 Abracon Drawing #453568 Revision : A 10. ABRACON CORPORATION - TERMS & CONDITIONS OF SALE The following are the terms and conditions under which Abracon Corporation ("AB") agrees to sell, to the entity named on the face hereof ("Buyer"), the products specified on the face hereof (the "Products"). 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