AB1805

Part: AB18X5 — Abracon Type: Real-Time Clock (RTC) with Power Management Description: Ultra-low power RTC family with integrated power management features, including a power switch, system sleep manager, and supercapacitor trickle charger, offering both I2C (up to 400 kHz) and SPI (up to 2 MHz) serial interfaces.

Operating Conditions:

• Supply voltage: 1.5-3.6 V
• Operating temperature: -40 to 85 °C
• Clock and RAM retention voltage: 1.5-3.6 V

Absolute Maximum Ratings:

Key Specs:

• Supply current (RC oscillator): 14 nA (at 3V)
• Supply current (RC oscillator with Autocalibration): 22 nA (at 3V)
• Supply current (crystal oscillator): 55 nA (at 3V)
• I2C interface speed: up to 400 kHz
• SPI interface speed: up to 2 MHz
• Crystal oscillator calibration: ± 2 ppm
• RC oscillator calibration: ± 16 ppm
• Integrated power switch resistance: ~1 Ω

Features:

• Ultra-low supply current
• 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
• Integrated power optimized RC oscillator
• Automatic calibration of RC oscillator to crystal oscillator
• Watchdog timer with hardware reset
• 256 bytes of general purpose RAM
• Integrated ~1 Ω power switch for off-chip components
• System sleep manager
• 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
• All inputs include Schmitt Triggers

Applications:

• Smart cards
• Wireless sensors and tags
• Medical electronics
• Utility meters
• Data loggers
• Appliances
• Handsets
• Consumer electronics
• Communications equipment

Package:

• QFN-16 (3x3 mm)

• 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
• -256 bytes of general purpose RAM
• Power management features:
• -Integrated ~1 Ω 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
• I 2 C (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

3.0 x 3.0 mm

Abracon Drawing #453570

Revision: C

• Smart cards
• Wireless sensors and tags
• Medical electronics
• Utility meters
• Data loggers
• Appliances
• Handsets
• Consumer electronics
• Communications equipment

Figure 1 and Table 2 show the QFN-16 pin configurations for the AB18X5 parts. Pins labeled NC must be left unconnected. The thermal pad, pin 17, on the QFN-16 packages must be connected to VSS.

Figure 1. Pin Configuration Diagram

Figure 1 and Table 2 show the QFN-16 pin configurations for the AB18X5 parts. Pins labeled NC must be left unconnected. The thermal pad, pin 17, on the QFN-16 packages must be connected to VSS.

Table 2: Pin Connections

3.0 x 3.0 mm

Abracon Drawing #453570

Revision: C

Date of Issue: September 16, 2014

Page 14 of 97

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, T A = -20 °C to 70 °C, TYP values at 25 °C, VCC = 1.7 to 3.6V.

Table 4 lists the absolute maximum ratings.

Table 4: Absolute Maximum Ratings

3.0 x 3.0 mm

Abracon Drawing #453570

Revision: C

Date of Issue: September 16, 2014

Page 18 of 97

Note: Recommended tuning fork crystal is ABS07-120-32.768kHz-T.

3.0 x 3.0 mm

Abracon Drawing #453570

Revision: C

Date of Issue: September 16, 2014

Page 5 of 97