Real-Time Clock. AB0805 Datasheet

AB0805 Clock. Datasheet pdf. Equivalent

AB0805 Datasheet
Recommendation AB0805 Datasheet
Part AB0805
Description Real-Time Clock
Feature AB0805; AB08X5 Real-Time Clock Family Date of Issue: October 16, 2014 3.0 x 3.0 mm Page 1 of 33 Abracon .
Manufacture Abracon
Datasheet
Download AB0805 Datasheet




Abracon AB0805
AB08X5 Real-Time Clock Family
Date of Issue: October 16, 2014
3.0 x 3.0 mm
Page 1 of 33
Abracon Drawing #453567
Revision: C
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 week-
day
- 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:
- 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 AB08X5 Real-Time Clock 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 AB08X5 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.
Disclaimer: AB08X5 series of devices are
based on innovative SPOT technology,
proprietary to Ambiq Micro.



Abracon AB0805
AB08X5 Real-Time Clock Family
Date of Issue: October 16, 2014
3.0 x 3.0 mm
Page 2 of 33
Abracon Drawing #453567
Revision: C
1. Family Summary
The AB08X5 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 AB18X5 RTC family are also listed.
Table 1: Family Summary
Baseline
Timekeeping
Advanced Timekeeping
Power Management
Part #
XT
Osc
Number
of GP
Outputs
RC
Osc
Calib/
Auto-
calib
Watch- RAM VBAT
dog (B) Switch
Reset
Mgmt
Ext
Int
Power
Switch and
Sleep FSM
Interface
AB0805
AB0815
AB1805
AB1815
3■■
2■■
256
256
Software and Pin Compatible AB18X5 Family Components
4■■
3■■
256
256
■■
■■
I2C
SPI
I2C
SPI



Abracon AB0805
AB08X5 Real-Time Clock Family
Date of Issue: October 16, 2014
3.0 x 3.0 mm
Page 3 of 33
Abracon Drawing #453567
2. Functional Description
Figure 1 illustrates the AB08X5 functional design.
VCC VBAT
Revision: C
nCE
SDI
SCL
SDA/O
XO
XI
WDI
EXTI
I2C/SPI
Interface
Power
Control
Calibration Engine
XT Osc
Divider
RC Osc
Divider
Analog
Compare
100ths
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Alarms
Timer
WDT
Control
RAM
Int/Clock
FOUT/nIRQ
nIRQ2
nTIRQ
VSS
Figure 1. Detailed Block Diagram
The AB08X5 serves as a full function RTC for host processors such as microcontrollers. The AB08X5
includes 3 distinct feature groups: 1) baseline timekeeping features, 2) advanced timekeeping features,
and 3) basic 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
AB0805) or a SPI serial interface (e.g., in the AB0815). 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
complement of countdown timers and alarms may additionally be set to initiate interrupts or resets on
several of the outputs.







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