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RX-62N Multi-Breakout Board

Actual Size (100dpi, click to zoom)

This is a generic RX-62N breakout board with the following features:

Support for this project is via community volunteers at the Renesas Rulz web site. I'm not making a lot of money on these, so don't expect much personal service.

The design of this board was done using The gEDA Suite for both schematic capture and board layout.

The fab for this run was Sierra Proto Express via their No-Touch service.

Ordering/Shipping Notes

The ordering option here is for a BLANK PCB. Cost is US$ 6.25 per blank pcb ($100/16 appealed to my inner geek). If you order just one, I'm going to stick it in an envelope taped to your invoice. 2-10 ships in a padded envelope. More than that gets a flat rate box. International: I've been having trouble with international, so if you don't get it after two weeks, email me. All payments are via PayPal, but they do let you use a credit card.

Current stock: 38     Quantity: at $6.25 each    

Assembly/Usage Options

The RX-62N Multi-Breakout Board can be built in many ways depending on which options you need, which programmers/emulators you'll be using, and how you want to power the board. You can also populate any RX-621 or RX-62N MCU chip in either the 100 or 144 pin TQFP packages. The RX-62T is not compatible.

Note that the LEDS P74 and P75 do not connect to any pin on the 100-pin package; if you install a 100-pin RX chip, there's no reason to install the LEDS, unless you want to jumper them to other pins via the headers.

Assembly Notes: The two diodes D1 and D2 do not have polarity marks on the initial run of boards. The mark is towards the USB connectors, as shown in the design files and PDF drawings. The mounting holes are sized for #4 screws.

Cables Power Parts Populated OS Notes
Y N O E1 Y O N N O Power, programming, debug all from E1. Optional power from other source via headers.
Y N Y USB Y O N Y Y Power from USB, programming, debug from E1
O N Y USB O Y N Y Y Power from USB, programming over USB via FDT or rxusb; manual jumper/reset
N Y Y USB O Y Y Y Y Power from USB, programming over USB via FDT or rxusb; manual jumper/reset, serial console via terminal emulator
N Y N gRX O R Y Y O Must install at least the RESET_GRX header, set for GRX. Program via gRX protocol (serial), serial console.
N Y Y gRX O R Y Y Y Must install at least the RESET_GRX header, set for GRX. Program via USB protocol under gRX control, serial console.

JP = configuraton jumpers (MD0, MD1, RESET_GRX, BIG_LITTLE)
gRX = FT232R chip (U3) and related circuitry, see schematics
LDO = 3.3v low-dropout regulator (U4) and related circuitry
USB = RX device USB and related circuitry
O = optional, R = at least RESET_GRX installed

If you've never hand-soldered fine-pitch QFP parts before, here's how I do it:

Soldering the 0603/0805 parts is similar - pre-solder one pad, hold part in place while reheating the solder, solder the other pad.

Note: After assembly, remove excess "no clean" flux from around the RTC circuit (xtal, caps, RX pins) and the USB pins (gRX, FT232R, USB, and RX pins). Some no-clean fluxes conduct slightly, which might corrupt these signals.

Header Options

There are two independent sets of headers; the inner ring and the outer ring. Either ring can be populated with either male or female, and those can be on the top or the bottom (both sides of the PCB are marked with the pin signals). While any generic 0.1" pitch header (0.025" square pins etc) should work, here are some part numbers...

This is what the original prototype looks like assembled. Note that I chose to put female headers on the outer ring, and male headers on the inner ring. I use the male headers with my logic analyzer and the female headers with my solderless breadboards, but of course either row could be populated with any type of connector.

The inner ring has the port numbers next to each pin. In this example, you see Port PD.0 through PD.3, P9.0 through P9.3, P4.4 through P4.7, and Vdd (V+) and ground (V-).

The port numbers are the same for the 144 and 100 pin devices, but the alternate functionality varies.

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  Copyright 2015   by DJ Delorie     Updated Jun 2015