App note: TPS25810 Charging Port Over USB Type-C™


Allow more current from USB Type-C port, an application note from Texas Instruments utilizing TPS25810 and TPS2544 USB port manager. Link here (PDF)

The TPS25810 is a USB Type-C downstream facing port (DFP) controller that monitors the USB TypeC™ configuration channel (CC) lines to determine when a USB device is attached. When the upstream facing port (UFP) device Type C-to-B dongle is plugged in, the port supports connection of Type-B receptacle devices such as a mouse, smartphones, keyboards, external hard drives, and so forth. As these devices monitor the USB 2 data line (D+/D–), the TPS2544 USB charging port controller can be added to provide the electrical signatures on D+/D– to support BC1.2 and non-BC1.2 compliant charging schemes. This application note presents the design solution which offers fast charging of popular mobile phones, tablets, and media devices over the USB Type-C port.

App note: bq77905 20S cell stacking configuration


Application note from Texas Instruments on their bq77905 ultralow power stackable battery protector. Link here (PDF)

The bq77905 is a 3-5S Low Power Protector with easy stacking capabilities for higher than 5S cell battery packs. This document provides an example for setting up a stacking configuration with the bq77905 and exhibits detailed analysis of the stacking functionality.

App note: LDC0851 quick-start guide


Texas Instrument’s differential inductive switch LDC0851 application guide. Link here (PDF)

Texas Instruments introduced the LDC1000 in 2012, the industry’s first inductance to digital converter. LDC1000 revolutionized the world of proximity sensing by delivering increased reliability, high resolution, and lower total system cost.

The LDC1000 was soon followed by second generation multi-channel LDC devices like the LDC161x and LDC131x. With up to four sensing channels and 28 bits of resolution the second generation of LDC devices opened the technology up to a wider range of applications and simplified system design. However, TI firmly believed that Inductive sensing could be simplified further. The LDC0851 is a differential inductive switch with a push/pull output that does not require digital programming to enable simpler deigns and lower system cost. This Application Note is a three-step guide to becoming a LDC0851 power user.

App note: The LM4935 headset and push-button detection guide


Another headset plug-in detection from Texas Instruments. Link here (PDF)

The headset detect circuitry can differentiate between mono, stereo, mono with microphone, and stereo with microphone headsets. It can operate while the LM4935 is placed into low current standby mode, which promotes extended battery life. In standby mode, it consumes no extra current, if the headset has not been inserted into the headset jack.

App note: Auto-zero amplifiers ease the design of high-precision circuits


An application note from Texas Instruments on new chopper amplifers superiority over old design chopper amps. Link here (PDF)

This article shows that the auto-zero calibration technique is very different from the chopper technique and is one that, when implemented through modern process technology, allows the economical manufacturing of wideband, high-precision amplifiers with low output noise.