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AB1813 Schematic ( PDF Datasheet ) - Abracon

Teilenummer AB1813
Beschreibung Real-Time Clock Module
Hersteller Abracon
Logo Abracon Logo 




Gesamt 30 Seiten
AB1813 Datasheet, Funktion
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.






AB1813 Datasheet, Funktion
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
Page 6 of 37
4. Package Pins
3.0 x 3.0 mm
Abracon Drawing #453567
Revision : A
4.1 Pin Configuration and Connections
Figure 2 and Table 2 show the QFN-16 pin configurations for the AB08XX parts. Pins labeled NC must be
left unconnected. The thermal pad, pin 17, on the QFN-16 packages must be connected to VSS.
AB080X
NC 1
(1) WDI
NC
VSS
PAD
nIRQ2
nTIRQ (1)
FOUT/nIRQ
EXTI (1)
VSS
AB081X
NC 1
(3) WDI
NC
VSS
PAD
nIRQ2
nCE
FOUT/nIRQ
EXTI (3)
SDI
(1) Available in AB0804 and AB0805 only, else NC
(2) Available in AB0803 and AB0805 only, else VSS
(3) Available in AB0814 and AB0815 only, else NC
(4) Available in AB0813 and AB0815 only, else VSS
Figure 2. Pin Configuration Diagram
Table 2: Pin Connections
Pin Name
Pin
Type
Function
Pin Number in AB08XX
01 03 04 05 11 13 14 15
VSS
VCC
XI
XO
AF
VBAT
Power
Power
XT
XT
Output
Power
Ground
System power supply
Crystal input
Crystal output
Autocalibration filter
Battery power supply
5,9,17 9,17 5,9,17 9,17 5,17 17 5,17 17
13 13 13 13 13 13 13 13
16 16 16 16 16 16 16 16
15 15 15 15 15 15 15 15
14 14 14 14 14 14 14 14
5555
SCL
SDO
SDI
nCE
Input I2C or SPI interface clock
7
7
7
7
7
7
7
7
Output SPI data output
6666
Input SPI data input
9999
Input SPI chip select
12 12 12 12
SDA
EXTI
WDI
FOUT/nIRQ
nIRQ2
CLKOUT/nIRQ3
nTIRQ
Input
Input
Input
Output
Output
Output
Output
I2C data input/output
External interrupt input
Watchdog reset input
Int 1/function output
Int 2 output
Int 3/clock output
Timer interrupt output
6666
10 10
10 10
22
22
11 11 11 11 11 11 11 11
44444444
88
88
12 12

6 Page









AB1813 pdf, datenblatt
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 12 of 37
Abracon Drawing #453567
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
FOF
CINX
CEX
XI and XO pin Crystal Fre-
quency
XT Oscillator failure detection
frequency
Internal XI and XO pin capac-
itance
External XI and XO pin PCB
capacitance
32.768
8
1
1
kHz
kHz
pF
pF
OAXT
XT Oscillation Allowance
At 25°C using a 32.768 kHz
crystal
270
320
k
FRCC
Calibrated RC Oscillator Fre- Factory Calibrated at 25°C,
quency(1)
VCC = 2.8V
128
Hz
FRCU
Uncalibrated RC Oscillator Calibration Disabled (OFF-
Frequency
SETR = 0)
89
122 220
Hz
JRCCC
RC Oscillator cycle-to-cycle
jitter
Calibration Disabled
SETR = 0) – 128 Hz
Calibration Disabled
SETR = 0) – 1 Hz
(OFF-
(OFF-
2000
500
ppm
AXT
XT mode digital calibration Calibrated at an initial tem-
accuracy(1)
perature and voltage
-2
2 ppm
24 hour run time
AAC
Autocalibration mode timing
accuracy, 512 second period,
1 week run time
TA = -10°C to 60°C(1)
1 month run time
1 year run time
35
20
ppm
10
3
TAC
Autocalibration mode operat-
ing temperature(2)
-10 60 °C
(1) Timing accuracy is specified at 25°C 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 -40°C to 85°C in XT mode. Autocal-
ibration mode timing accuracy is specified relative to XT mode timing accuracy from -10°C to 60°C.
(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 AB08XX should be switched to use the XT oscillator as its clock source when this
occurs. Please see the Autocalibration Fail section for more details.

12 Page





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