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PDF ( 数据手册 , 数据表 ) AB0803

零件编号 AB0803
描述 Real-Time Clock Module
制造商 Abracon
LOGO Abracon LOGO 


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AB0803 数据手册, 描述, 功能
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.







AB0803 pdf, 数据表
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 8 of 37
Abracon Drawing #453567
Revision : A
Table 3: Pin Descriptions
Pin Name
Description
nIRQ2
1. Secondary interrupt output connection. It is an open drain output. nIRQ2 may be configured to
generate several signals as a function of the OUT2S field (see 0x11 - Control2).nIRQ2 can drive
the value of the OUTB bit.
2. nIRQ2 can drive the square wave output (see 0x13 - SQW) if enabled by SQWE.
3. nIRQ2 can drive the inverse of the combined interrupt signal IRQ(see Interrupts).
4. nIRQ2 can drive the inverse of the alarm interrupt signal AIRQ(see Interrupts).
5. nIRQ2 can drive either sense of the timer interrupt signal TIRQ.
nTIRQ (only available in Timer interrupt output connection. It is an open drain output. nTIRQ always drives the active low nTIRQ
I2C environments)
signal.
CLKOUT/nIRQ3
Square Wave output connection. It is a push-pull output, and may be configured to generate one of two
signals.
1. CLKOUT/nIRQ3 can drive the value of the OUT bit.
2. CLKOUT/nIRQ3 can drive the square wave output (see 0x13 - SQW) if enabled by SQWE.







AB0803 equivalent, schematic
AB08XX Real-Time Clock Family
Date of Issue: November 7, 2013
3.0 x 3.0 mm
Page 16 of 37
Abracon Drawing #453567
Revision : A
Figure 8 shows the typical VCC power state operating current vs. temperature in RC Autocalibration mode.
TA = 25 °C
40 30 20
55
50
45
40
35
30
25
20
15
10
5
10 0
10 20
Temperature  (°C)
VCC = 3.0V
30 40
VCC = 1.8V
50 60
70
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
60
XT Oscillator Mode
50
40
30
RC  Autocalibrated  Mode
20
10
0
1.5
RC Oscillator Mode
2
2.5
VCC  Voltage (V)
3
3.5
Figure 9. Typical VCC Current vs. Voltage, Different Modes of Operation










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