Energy-Friendly IC and Evaluation Kit for iOS Accessory Development

Silicon Labs now offers a digital audio bridge chip and evaluation kit designed to simplify the development of accessories for iOS devices. Target applications include audio accessories such as guitar and microphone recording dongles, audio docks, and headphones. The CP2614 IC also provides built-in support for communication between iOS applications and accessory hardware, enabling a broad array of Internet of Things (IoT) accessories that operate with a companion iOS app.Silicon Labs CP2614

The CP2614 bridge chip and MFI-SL-CP2614-EK evaluation kit provide a cost-effective, comprehensive development platform for iOS accessory developers, enabling fast time to market through fixed-function MFi support. The CP2614 solution requires no firmware development, which helps developers get up and running quickly with their MFi accessory designs. Developers simply select their customization options with an easy-to-use GUI-based configuration tool.

The CP2614 bridge chip carefully manages and minimizes power consumption, achieving ultra-low power in both active and idle modes. The CP2614 IC’s energy efficiency makes it good choice for device-powered accessories. In addition, the CP2614 includes an integrated 5-V low drop-out (LDO) regulator, which reduces BOM cost and footprint for self-powered accessories. The CP2614 device operates without an external crystal or EEPROM, storing all configuration options on chip. The crystal-less architecture and integrated EEPROM further reduce BOM cost as well as PCB space, enabling developers to design smaller, more streamlined and cost-effective accessories.


The CP2614 audio bridge chip supports 24-bit unidirectional and 16-bit bidirectional digital audio streaming, enabling developers to create high-quality, high-performance “prosumer”-class audio accessories. The CP2614 can establish a communications channel with an iOS application, enabling the app to interact directly with the accessory hardware through general-purpose input/output (GPIO) read/writes and access to the UART for custom data flow. The GPIO can be configured for button input and LED output and accessed remotely from an iOS app or used to control audio playback.


The CP2614 audio bridge IC and MFI-SL-CP2614-EK evaluation kit are in full production and available to MFi licensees today. Available in a 5 mm x 5 mm QFN32 package, the CP2614 IC is priced at $2.51 (USD) in 10,000-unit quantities. The MFI-SL-CP2614-EK is priced at $59 (USD MSRP). MFi licensees can order the evaluation kit through the Apple MFi Procurement Portal.

Source: Silicon Labs

New EZ App Lynx Library for Creating Smart Bluetooth Sensors

CCS C-Aware IDE now includes the EZ App Lynx library (#include <EZApp.c>). Quickly create a Bluetooth wireless sensor, or controller, that may be viewed or managed on a paired mobile device using the EZ App Lynx Android app.EZ App Lynx Post_final

The free EZ App Lynx Library was created to shorten the design time for smart Bluetooth app development. With EZ App Lynx, and no required hardware or software expertise, the library removes the barriers to entry for smartphone app developers who want to take advantage of a growing number of Bluetooth enabled smartphones and tablets. The new library allows for any GUI, on the App, to be created at run time from a PIC program. The library offers many useful sensor interface components, which allow for: Status Bars, Gas Gauges, Sliders, Buttons, Text Fields, and more.

EZ App Lynx Library Features and Advantages:

  • No app design knowledge required
  • Source code libraries included with all CCS C Compilers
  • Included with maintenance update download

EZ App Lynx App:

  • Available for Android in Google Play Store (iOS available soon)
  • Build your own EZ App Lynx App in minutes with simple C library calls on the PIC
  • Quick and easy prototyping

Source: CCS

WillowTree Apps Named Microchip Design Partner

Microchip Technology recently announced its first App Developer Specialist—WillowTree Apps—the latest company to join its Design Partner Network. WillowTree is an iOS, Android, and Mobile Web app developer that enables Microchip’s customers to focus on Internet of Things (IoT) designs.MicrochipWillowTree

WillowTree wrote the first mobile app for Microchip’s Wi-Fi Client Module Development Kit 1, which is available in the Apple App Store. It enables customers to quickly get up and running with the kit’s cloud-based demo. WillowTree can also modify this cloud-demo app to suit a broad range of customer IoT design requirements.

Source: Microchip Technology

Elektor RF & Microwave App for Android

Elektor has an iPhone/iPad app for several months. And now Android users can have an Elektor app of their own. The Elektor RF & Microwave Toolbox app is perfect for engineers and RF technicians who need easy, reliable access to essential equations, converters, calculators, and tools.

A screenshot of the Elektor RF & Microwave app for Android

The app includes the following handy tools:

1.Noise floor (Kelvin,dBm)
2.Amplifier cascade (NF, Gain, P1db, OIP2, OIP3)
3.Radar equation (2-way path loss)
4.Radio equation (1-way path loss)
5.Power and voltage converter (W,dBm,V,dBµV)
6.Field intensity and power density converter (W/m2, V/m, A/m, Tesla, Gauss,dBm, W)
7.Mismatch error limits (VSWR, Return loss)
8.Reflectometer (VSWR, Return loss)
9.Mitered Bend
10.Divider and Couplers (Wilkinson, Rat race, Branchline , microstrip and lumped)
11.Balanced and und balanced PI and T attenuator
12.Skin depth (DC and AC resistance)
13.PCB Trace calculator (impedance/dimensions)
14.Image rejection (amplitude and phase imbalance)
15.Mixer harmonics (up and down conversion)
16.Helical antenna
17.Peak to RMS (peak, RMS, average, CF)
18.Air Core Inductor Inductance
19.Parallel plate Capacitor
20.PI and T attenuator
21.Ohm’s Law
22.Parallel LCR impedance/resonance
23.Series LCR impedance/resonance
24.Inductor impedance
25.Capacitance impedance
26.Antenna temperature (Kelvin)
27.Radar Cross Section (RCS) calculator (Sphere,Cylinder, flat plate, corners, dBsm)
28.Noise Figure Y-Factor Method
29.EMC (EIRP, ERP, dBµV/m)
30.Noise figure converter (dB, linear, Kelvin)
31.Frequency Band Designations
32.Resistor color code (reverse lookup, 3 to 6 band)
33.Filter Design (Butterworth, Chebyshev, prototype):
34.µ-Filter Design (microstrip, stripline)
35.PCB Trace Width and Clearance Calculator

Visit the Android Market for more information about the Elektor app.

Circuit Cellar does not yet have an app for Android. The Circuit Cellar iPhone/iPad app is available on iTunes.

Screenshots of the Circuit Cellar app

Elektor International Media is the parent company of Circuit Cellar.