One argument might me, that all but the 84 and 861 are only available in soic , qfn and other smd-packages, while the others are still available as DIP.
Pro DIP: there is a bigger maker community behind those devices, as they can be used the "traditional way" and as well from the shop to the bread-board.
Thats one of the advantages of the digispark as well, that you can buy the 85 around $1 in a dip, and throw it in small projects
Pro SOIC: Advantage would be, to offer a device to makers, which was out of scope because of limited soldering equipment.
However for that, the device needs to bring new possibilities or a much better pricing, than others.
the 1634 and 84 lacks PWM out-channels compared to the rest
for all but the 1634 is a robust high temperature automotive version available, interesting for several use cases, which could easily adapted (not necessarily that it is used in the pro)
I think (and that may be only my very own perspective), that one of the big advantages of the digispark is the community, with similar products, like e.g. littlewire, lily-tiny and core chip projects.
just a few thoughts.
I have collected some of the different core features of the five mentioned micros:
Device Name | Flash (Kbytes) | Pin Count | Max. Operating Frequency | # of Touch Channels | Max I/O Pins | UART | ADC channels | Temp. Sensor | SRAM (Kbytes) | EEPROM (Bytes) | picoPower | Output Compare channels | Input Capture Channels | PWM Channels | 32kHz RTC | Calibrated RC Oscillator | Automotive Version available | Price with crystal, if needed | Packages
|
ATtiny1634 | 16 | 20 | 12 | 11 | 18 | 2 | 12 | No | 1 | 256 | Yes | 2 | 2 | 4 | Yes | Yes | No | $1.32 | MLF (WQFN) 20M1 20,SOIC (300mil) 20S2 20,WLCSP 12U1 12
|
ATtiny167 | 16 | 20 | 16 | 8 | 16 | 1 | 11 | Yes | 0.5 | 512 | No | 3 | 1 | 9 | Yes | Yes | Yes | $1.45 | MLF (VQFN) 32M1-A 32,SOIC TG 20,TSSOP 6G 20
|
ATtiny84 | 8 | 14 | 20 | 6 | 12 | 0 | 8 | Yes | 0.5 | 512 | No | 4 | 1 | 4 | No | Yes | Yes | $1.07 | MLF (WQFN) 20M1 20,PDIP 14P3 14,SOIC (150mil) 14S1 14
|
ATtiny861 | 8 | 20 | 20 | 8 | 16 | 0 | 11 | Yes | 0.5 | 512 | No | 6 | 1 | 6 | No | Yes | Yes | $1.72 | MLF (VQFN) 32M1-A 32,PDIP 20P3 20,SOIC (300mil) 20S2 20
|
ATtiny87 | 8 | 20 | 16 | | 16 | 1 | 11 | Yes | 0.5 | 512 | No | 3 | 1 | 9 | Yes | Yes | Yes | $1.32 | MLF (VQFN) 32M1-A 32,SOIC TG 20,TSSOP 6G 20
|
regards
gogol