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GoodWatch30

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Travis Goodspeed edited this page Sep 20, 2019 · 2 revisions

The GoodWatch30 is the fifth radio model, whose band coverage has been extended to either 300-550MHz or 300-950MHz by dropping the bandpass filter of the GoodWatch22 and replacing it with low-pass filtering and a separate balun. Its firmware is stable and ready for daily wear, with three years of battery life when the radio is off.

Adjustments include better ground via stitching and clearer silkscreen text, but the schematic and BOM have changed significantly from the prior series.

Assembly

All parts are assembled as described in the schematic, except the chip antenna, which cannot fit between the PCB and the LCD. We are currently experimenting with using the watchband as a random wire antenna by running a wire-wrap wire around the PCB and out through the watch case.

Assembly is a bit easier than older models, except that hot air is required for U3, the Anaren balun.

See the BootStrapLoader or JTAG page for flashing and testing instructions.

Schematic

Schematics are available as goodwatch30.pdf. A BOM, Kicad files, and Gerbers are available within the Git repository.

Bill of Materials

The CC430F6147 is now preferred over the CC430F6137, but the older
chip is still supported by firmware.


Base parts, required for all watches.

        MfgrPartNo              Digikey             Pkg      Qty   Cmt
U1      CC430F6147IRGCR         296-39985-1-ND      VQFN64   1     CPU
R1      RMCF0402JT75K0          RMCF0402JT75K0CT-ND 0402     1     75K
C1      CL10A476MR8NZNE         1276-6528-1-ND      0603     1     47uF
C2,C3   GRM152C80J104KE19D      490-9997-1-ND       0402     2     0.1uF (<0.3mm thickness)
C4      GRJ155R60J106ME11D      490-13211-1-ND      0402     1     10uF
C5      CL05A474KP5NNNC         1276-1173-1-ND      0402     1     0.47uF
Y1      ABS07-120-32.768KHZ-T   535-11937-1-ND      SMDXTAL  1     32.768kHz6pF

Radio parts, only required for the optional SubGHz radio.  Choose one
of the two options for U2, but not the other.

R2      CRGCQ0402F56K           A129648CT-ND        0402     1     56k, 1%
Y2      FA-128 26.0000MF10Z-W5  SER4186CT-ND                 1     26MHz SMD Xtal, 12pF
A1      ANT1204F002R0433A       311-1570-1-ND                1     430MHz Chip Antenna, you probably won't populate this.
J1      0734120110              WM5587CT-ND                  1     u.FL/UMCC coaxial antenna connector, you probably won't populate this.
C6,C7   CL05C120JB5NNNC         1276-1178-1-ND      0402     2     12pF
C8,C9   GRM152C80J104KE19D      490-9997-1-ND       0402     2     0.1uF (<0.3mm thickness) (Same as C2,C3.)
L1      BLM15HG102SN1D          490-3999-1-ND       0402     1     Ferrite Bead
U2      0500LP15A500            712-1117-1-ND       0805     1     500MHz Low Pass Filter (70cm usage)
U2      0868LP15A020E           712-1585-1-ND       0805     1     868MHz Low Pass Filter (EU unlicensed usage)
U2      0915LP15B02             712-1122-1-ND       0805     1     915MHz Low Pass Filter (33cm usage)
U3      B0310J50100AH           1173-1050-1-ND      0805     1     300MHZ-1GHz Balun
C10     885012205040            732-7535-1-ND       0402     1     220pF DC Bypass Capacitor
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