ION (Input/Output Node) Picobus, further detail


		Contact Ordering Examples Design Home

US SITE · AUS SITE

ABOUT US
Company Detail Enquiry Form Sitemap
WHAT WE MAKE
Our Design method Spec'ing your job Hardware design Firmware design Examples: Circuits


OUR CIRCUITS
Mechatronic controller Programmable oscillator RS485 firepanel int IRDA Interface Nursecall indicator Serial to Parallel Navy SMD Trainer Danfoss tester 89C2051 project Weighscale Light Key Tone Gen Index - Main Library
OUR DESIGN STEPS
Design step-by-step Circuit diagrams PCB Layout PCB Etching Prototyping Firmware design Documentation Manufacturing Economies of scale Test Procedures ECOs - changes
SPECIFY YOUR WORK
Overview Specification Intro. Writing a Spec Tech Ingredients Example Specs Engineer employment R&D Economics Design Inspiration
REFERENCE
Autotrax PCB CAD Autotrax resources Autotrax utilities Protel VESA drivers Products - 1990s Our PicoBus IO Std RS232 RS485 FR4 Autotrax CAD Library P89LPC932 Program Header Using a Multimeter
FURTHER INFO
Complete site index Offsite Links (15000+) Google search

CONTACT or ENQUIRY

Picobus - further information

This page expands on our basic picobus information page.

There is one dual function line, Q3-, which can function as a switch to Vcc and/or as a negative supply, depending on the microprocessor motherboard implementation. No system has yet implemented this feature, however the circuit excerpt shown has been prototyped and tested.

Implementation	Q3- Function
No negative supply	Q3- function same as Q0-Q2
No Q3 Mux select	Q3- is nominal -7V
Both -Vee and Q3 Muxsel	Q3- is push-pull driver, switch to Vcc at time T=3, switch to -7V at other times

The presence of a negative voltage simplifies the design of some circuitry. The -7V may also be used in conjunction with the +5V to supply 12V for a relay coil. The translation of a normal Qn signal, which is typically 0v...5v level, to the Q3- signal, which is -7v...5v level, does require extra circuitry. A typical circuit for this translation appears below.

Note: This circuit is presented as a typical
example only and is not mandatory

Implementing optional Q3-

Any circuitry utilizing the -7V rail must include a supply switch, such that -7V is only connected when +5V and Gnd are detected. Devices using -7V should also feature a prominent warning in the instructions for the user to remove power before connecting or disconnecting the Picobus connector.

This page had a Maintenance update: 23 April 2013

Overview Continue