Hello. I would like to use the RTC ds1339, and I would like to take advantage of its trickle charging capability. The datasheet for it is here:
https://www.electro-tech-online.com/custompdfs/2010/07/DS1339-DS1339U.pdf
However, I am a little confused about how it works. My first question is that on page 15, it says that there needs to be a diode and resistor in series connecting vcc to vbat. I am unsure if I am supposed to supply these components, or if they are already included in the device and that I just need to set the registers to select their use. The diagram in figure 5 makes it look like that these components are already included.
My second question is just one to make sure I don't end up smelling magic smoke. Am I correct that this device can charge a li-ion battery like this:
SparkFun Electronics - Polymer Lithium Ion Battery - 110mAh
The li-ion battery probably needs to be charged at 4.1V or something. There are more than one version of the ds1309, one for 5V, one for 3.3V, and one for 2V. I would like to use all of them in separate circuits for different applications, and I am wondering if this chip handles all the step ups and downs itself. In the datasheet, it mentions that it can do li-ion, but I would like to make sure.
Thank you for your time!
https://www.electro-tech-online.com/custompdfs/2010/07/DS1339-DS1339U.pdf
However, I am a little confused about how it works. My first question is that on page 15, it says that there needs to be a diode and resistor in series connecting vcc to vbat. I am unsure if I am supposed to supply these components, or if they are already included in the device and that I just need to set the registers to select their use. The diagram in figure 5 makes it look like that these components are already included.
My second question is just one to make sure I don't end up smelling magic smoke. Am I correct that this device can charge a li-ion battery like this:
SparkFun Electronics - Polymer Lithium Ion Battery - 110mAh
The li-ion battery probably needs to be charged at 4.1V or something. There are more than one version of the ds1309, one for 5V, one for 3.3V, and one for 2V. I would like to use all of them in separate circuits for different applications, and I am wondering if this chip handles all the step ups and downs itself. In the datasheet, it mentions that it can do li-ion, but I would like to make sure.
Thank you for your time!