- on Microcontrollers
- Published in issue 12/2004 on page 0
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
In the circuit diagram in Figure 1, the outer connection of the mains adapter socket is shown connected to ground while the centre pin carries the positive supply voltage. On the PCB designed for the project, these connections are the other way around.
Even if the circuit diagram does not show it explicitly, the P82B715PN is a bidirectional component (see www.semiconductors.philips.com/pip/P82B715PN.html). Consequently, nothing changes when compared to the circuit without the P82B715PN. Incidentally, controlling devices over the I2C bus always requires a bidirectional interface.
R1 = 15kOhm
R2,R3 = 33Ohm
R4 = 1kOhm5
R5,R6,R8,R9,R10 = 10kOhm
R7 = 5kOhm6
R11,R12 = 330Ohm
C1,C4 = 1µ F 16V radial
C2,C3,C7-C11 = 100nF
C5,C6 = 22pF
D1,D2 = BAT85
D3 = 1N4001
IC1 = TUSB3410 (Digikey # 296-12699-ND)
IC2 = 24LC64, programmed, order code 040334-21
IC3 = LM1117-3.3 or LD1117V33C (Digikey # 497-1492-5-ND)
IC5 = P82B715PN (Farnell # 559-258; RS Components # 821-784)
T1,T2 = FDV301N (Farnell # 995-848; RS Components # 354-4907)
K1 = USB-B connector, angled, PCB mount (Farnell # 152-754)
K2 = mains adapter socket PCB mount
K3 = 6-way RJ-11 connector (Farnell # 393-8359)
X1 = 12MHz quartz crystal
PCB, order code 040334-1 (see Readers Services page)
Disk, project software, order code 040334-11 or Free Download