 Hello and welcome to this presentation on low-power real-time clock ICs for portable and wearable devices. ST has a wide range of real-time clock ICs that address all consumer and industrial applications that need to retain date and time data. The low-power series of RTC ICs combines very low standby current consumption with miniaturization. Two key features for portable devices where long battery life and small size are crucial. The industry standard series includes class-leading RTCs for industrial, networking and automation applications. These highly integrated ICs combine a real-time clock and VRAM memory and a large set of microprocessor supervisory functions in a single chip solution. The most integrated RTC is the M41ST87W Securitizer, which includes a microprocessor supervisor and VRAM supervisor and physical temper detect feature, as well as an internal and external RAM clear function for secure applications. Today, most microcontrollers have a real-time clock already embedded. However, there are applications where a standalone RTC provides added value. Let's see how. First of all, by using a standalone RTC to keep track of time, an application consumes roughly three times less current compared to a microcontroller. This is really important, for example, in systems powered by coin cell batteries. In systems powered by lithium-ion batteries, a standalone RTC can keep time for quite a while using only a small capacitor. This is especially useful when replacing the battery. An RTC like the M41T62LC6F can be connected directly to the battery and provide all the RTC functions in the same size of the simple quarts. The M41T62LC6F is the newest low-power RTC from ST. Housed in an ultra-small package that measures only 3.2 by 1.5 mm and embeds the crystal, this RTC consumes only 350 nanoamps and operates at a very low timekeeping voltage, less than 1 volt. The device also embeds a programmable alarm with wake-up functions. Now let's see why the M41T62LC6F's features perfectly meet the requirements for portable applications. Low power consumption and small size are probably the most important features in portable applications. The M41T62LC6F provides very low current consumption and the smallest size for an RTC module. Its 1 volt timekeeping voltage allows it to be used as a backup capacitor to keep time when the primary battery, coin cell, or lithium ion is replaced. Of course, a surface mount package is a must. The M41T62LC6F is mounted in an SMT package the same size as the crystal itself. Its wide operating voltage range of 1.3 to 4.4 volts ensures compatibility with practically all kinds of batteries and chemistries, coin cells, lithium ion, and triple A. The oscillator fail feature indicates that the oscillator has either stopped or was stopped for some period of time. For example, this can happen if the VCC voltage drops below 1 volt. The oscillator fail bit is used to judge the validity of the clock and date data. Optionally, if the oscillator fail bit is set, the interrupt pin can also be activated in order to report the failure to the microcontroller. The M41T62LC6F offers the user a programmable square wave function which is output on the SQW pin. The default output frequency is 32 kilohertz, but it can be programmed down to 1 hertz. This function allows saving the low frequency crystal which is needed in many applications, especially in RF enabled portable devices. The M41T62LC6F retains tenths and hundredths of seconds. It embeds a programmable alarm with repeat modes and interrupt functions. The watchdog timer is programmable from 62.5 milliseconds to 31 minutes. The square wave output is also programmable from 1 hertz to 32 kilohertz. It powers up at 32 kilohertz and can be turned off. Alarm operation. When the clock value matches the alarm clock value based on the match criteria defined by bits RPT5 through RPT1, the alarm flag or AF is set. If the alarm flag enable bit or AFE is also set, the alarm condition activates the IRQ outpin. To disable the alarm, write 0 to the alarm date register and bits RPT5 through RPT1. Watchdog operation. The user programs the watchdog timer by setting the desired timeout in the watchdog register at address 09H. Timeout isn't determined to be the multiplication of the 5-bit multiplier value with the resolution. For example, writing 00001110 in the watchdog register equals 3 times 1 or 3 seconds. If the processor does not reset the timer within the specified period, the M41T62 sets the watchdog flag or WDF. The M41T62LC6F low-power serial real-time clock has already been successfully adopted by our customers for portable and wearable devices. It can be used in a variety of applications including wireless sensors, fitness monitors, smartwatches, tracking devices and data logging. Thank you for your attention. For further information, visit www.st.com. www.st.com.