I was told that the Mbili has the same datasheet as the Tatu. You can find relevant information here:
- http://mbili.sodaq.net/wp-content/uploads/2015/03/sodaq_mbili_rev5_sch_v1.png
- and more information - http://mbili.sodaq.net/
Please be careful with the micro-usb port, I broke mine already off.
Good luck !