Datasheet for the LTC4412HV from Linear Technology, a low-loss PowerPath controller that drives an external P-channel MOSFET as an ideal diode.

AT command reference for the SIM900 GSM/GPRS module, provided as a 1.53 MB PDF. The manual lists the commands used to control calls, SMS, network registration, GPRS data…

PDF datasheet covering the MT8880C, an integrated DTMF transceiver with a microprocessor bus interface, able both to decode and to generate dual-tone signalling.