RTCs
Introduction
Ambiq offers the world’s lowest power Real-Time Cock (RTCs) with or without power management.
| Part Number | Interface | Package | Size (mm) | SRAM (byte) | Power Management | Trickle Charger |
|---|---|---|---|---|---|---|
| AM1805AQ | I2C | 16-Pin QFN | 3x3 | 256 | x | x |
| AM1815AQ | SPI | 16-Pin QFN | 3x3 | 256 | x | x |
| AM0805AQ | I2C | 16-Pin QFN | 3x3 | 256 | ||
| AM0815AQ | SPI | 16-Pin QFN | 3x3 | 256 |
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Products
- RTCs without power management
- RTCs with power management
RTCs without power management
The Ambiq Micro AM08xx Low Power Real-Time Clock (RTC) 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 14nA in RC mode, 22nA in auto calibration mode, 55nA in XT mode), these are the first semiconductor products based on Ambiq Micro’s innovative SPOT™ (Subthreshold Power Optimized Technology) CMOS Platform.
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Features
- Ultra-low supply current:
- <14nA with RC oscillator
- <22nA with RC oscillator and auto calibration
- <55nA with crystal oscillator
- Baseline timekeeping features:
- 32 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 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
- Enhanced I/O features:
- Automatic switchover to VBAT
- External interrupt monitor
- Programmable brown out detection
- Programmable analog voltage comparator
- Up to 256 bytes of general purpose RAM
- I²C (up to 400 kHz) or SPI (up to 2 MHz) serial interface
- Supports 3-wire and 4-wire SPI
- Operating Voltage 1.7-3.6 V
- Clock and RAM retention voltage 1.5-3.6 V
- Operating temperature –40 to 85 °C
- 3 mm x 3 mm QFN-16 package
- Also available in wafer form
AM08xx family summary
| Part # | Baseline Timekeeping XT Osc | Baseline Timekeeping Number of GP Outputs | Advanced Timekeeping RC Osc | Advanced Timekeeping Calib/ Auto-calib | Advanced Timekeeping Watch-dog | Advanced Timekeeping RAM (B) | Enhanced I/O VBAT Switch | Enhanced I/O Ext Int | Interface |
|---|---|---|---|---|---|---|---|---|---|
| AM0805 | • | 4 | • | • | • | 256 | • | • | I²C |
| AM0815 | • | 3 | • | • | • | 256 | • | • | SPI |
For AM08xx Documentation, please contact us at ambiq-Info@eu.kagafei.com
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RTCs with power management
The Ambiq Micro AM18xx Low Power Real-Time Clock (RTC) family provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set optimized for system-level power management.
With power requirements significantly lower than any other industry RTC (as low as 14nA in RC mode, 22nA in auto calibration mode, 55nA in XT mode), these are the first semiconductor products based on Ambiq Micro’s innovative SPOT™ (Subthreshold Power Optimized Technology) CMOS Platform.
Advanced power management features includes an integrated power switch and a sophisticated system sleep manager with counter, timer, alarm, and interrupt capabilities that allows the AM18xx to be used as a complete system-level power manager.
Also available in wafer form.
Visit our Webshop if you are interested to buy some parts!
Features
- Ultra-low supply current:
- <14nA with RC oscillator
- <22nA with RC oscillator and auto calibration
- <55nA with crystal oscillator
- Baseline timekeeping features:
- 32 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 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
- Advanced power management features:
- Integrated <1Ω power switch for off-chip components such as a host MCU, radio, sensor, etc.
- System sleep manager for managing host processor wake/sleep states
- External interrupt monitor
- External reset signal monitor
- Reset output generator
- Automatic switchover to VBAT
- Supercapacitor trickle charger with programmable charging current
- Programmable brown out detection
- Programmable analog voltage comparator
- Up to 256 bytes of general purpose RAM
- I²C (up to 400 kHz) or SPI (up to 2 MHz) serial interface
- Supports 3-wire and 4-wire SPI
- Operating Voltage 1.7-3.6 V
- Clock and RAM retention voltage 1.5-3.6 V
- Operating temperature –40 to 85 °C
- 3 mm x 3 mm QFN-16 package
- Also available in wafer form
AM18xx family summary
| Part # | XT Osc | Number of GP Outputs | RC Osc | Calib/ Auto-calib | Watch-dog | RAM (B) | VBAT Switch | Reset Mgmt | Ext Int | Power Switch and Sleep FSM | Interface |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AM1805 | x | 4 | x | x | x | 256 | x | x | x | x | I²C |
| AM1815 | x | 3 | x | x | x | 256 | x | x | x | x | SPI |
For AM18xx Documentation, please contact us at ambiq-Info@eu.kagafei.com
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Applications
Which applications are concerned?
- Smart cards
- Wireless sensors and IoT
- Wearable health and fitness devices
- Medical electronics
- Utility meters
- Data loggers
- Appliances
- Consumer electronics
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Supplier Profile
Company Overview
Ambiq Micro was founded in 2010 on the notion that extremely low power semiconductors are the key to the future of electronics. The company developed a patented Subthreshold Power Optimized Technology (SPOT™) platform that dramatically reduces the amount of power consumed by semiconductors. Normal CMOS processes are working with an internal core voltage above the threshold voltage a transistor needs to make a logical low or high decision. Therefore most cores are working at 1.8V or 1.2V depending on the CMOS process.
By applying SPOT™ on a standard CMOS process, the internal core voltage can be minimized to 0.5V. While the energy consumption is proportional to the squared voltage, SPOT™ can reduce energy usage by up to 13 times!
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