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PDF AB1814 Data sheet ( Hoja de datos )

Número de pieza AB1814
Descripción Real-Time Clock Module
Fabricantes Abracon 
Logotipo Abracon Logotipo



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No Preview Available ! AB1814 Hoja de datos, Descripción, Manual

AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 1 of 34
Abracon Drawing #453567
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 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
- Up to 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 AB08XX 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 AB08XX 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: AB08XX series of devices are
based on innovative SPOT technology,
proprietary to Ambiq Micro.

1 page




AB1814 pdf
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 5 of 37
Abracon Drawing #453567
3. AB08XX Example Applications
Revision : A
3.1 Battery Backed Up RTC
The most common AB08XX application is a battery backed up RTC, which maintains time and may hold
data in RAM. The AB08XX is normally powered from a system power supply, which may be a larger
battery. The AB08XX is continuously charging a supercapacitor or rechargeable battery via the internal
trickle charger. When the main power supply goes away, the AB08XX automatically switches to the VBAT
supply and maintains time and RAM data at very low battery supply currents.
System Power
Battery/
Supercap
1.5k*
VBAT
VCC
I2C/SPI
VCC
XO AB08XX
MCU
FOUT/nIRQ
XI
IRQ
VSS
VSS
* Total battery series impedance = 1.5k ohms, which may require an external resistor
3.2 RTC with Interrupt Aggregation
The flexible inputs of the AB08XX can be used to aggregate a variety of interrupt sources, including
external digital inputs, analog levels, timers and alarms into a single interrupt source to an MCU.
System Power
Digital Inputs
Analog Level
XO
VCC
I2C/SPI
VCC
AB08XX
XI
FOUT/nIRQ
WDI
EXTI
VBAT
VSS
MCU
IRQ
VSS

5 Page





AB1814 arduino
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 11 of 37
Abracon Drawing #453567
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
VT+
VT-
IILEAK
CI
VOH
VOL
IOH
IOL
IOLEAK
PARAMETER
TEST
CONDITIONS
Positive-going Input Thresh-
old Voltage
Negative-going Input Thresh-
old Voltage
Input leakage current
Input capacitance
High level output voltage on
push-pull outputs
Low level output voltage
High level output current on
push-pull outputs
VOH = 0.8VCC
Low level output current
VOL = 0.2VCC
Output leakage current
VCC
3.0V
1.8V
3.0V
1.8V
3.0V
1.7V – 3.6V
1.7V – 3.6V
1.7V
1.8V
3.0V
3.6V
1.7V
1.8V
3.0V
3.6V
MIN
0.8
0.5
0.8•VCC
-2
-3
-7
-8.8
3.3
6.1
17
18
Revision : A
TYP
1.5
1.1
0.9
0.6
0.02
3
-3.8
-4.3
-11
-15
5.9
6.9
19
20
0.02
MAX
2.0
1.25
80
0.2•VCC
UNIT
V
V
nA
pF
V
V
mA
mA
80 nA

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