4 ms·
The antenna is the limiting factor IIRC, the smallest module available is this thing: https://www.fdk.com/cyber-e/electronic_components/module/ble.html https://
by nimish 2y ago
The antenna is the limiting factor IIRC, the smallest module available is this thing: https://www.fdk.com/cyber-e/electronic_components/module/ble.html https://www.fdk.com/cyber-e/electronic_components/module/ble... which has the antenna as a slot in the package itself.
- bboygravity 2y agoLimiting factor for what application? The battery/power supply alone is going to be at least an order of magnitude larger in volume.
- Joel_Mckay 2y ago"The battery/power supply alone is going to be at least an order of magnitude larger in volume." Indeed, people do use rechargeable lithium batteries like the 50mAh CR322 (22mm by 3mm) or smaller CR311, but these would only be able to handle a 11mA EFR32BG29 output load for a few hours at most... Yet in a mostly dormant power save mode YMMV =3
- inhumantsar 2y agoif we're talking about a device that only needs centimeters worth of range and spends most of its time in deep sleep, those 50mA could last quite a while.
- bsder 2y agoAnd would last a whole lot longer if the BLE manufacturers would pull their heads out of their asses and give us a chip with RTC wakeup current that doesn't suck. Microcrystal can make these things to run at <50nA. https://www.microcrystal.com/en/products/real-time-clock-rtc-modules https://www.microcrystal.com/en/products/real-time-clock-rtc... All the BLE manufacturers are 1uA plus. It's infuriating.
- pajko 2y agoThe BG22 consumes 0.5 uA in EM4 mode with the BURTC+LFXO enabled.
- arghwhat 2y agoYou wouldn't use a chip antenna if you're that tight on PCB space. A trace at the circumference of the PCB, or a wire antenna that only take up space for the solder joint would do.
- TheSpiceIsLife 2y agoFractal antenna! https://en.wikipedia.org/wiki/Fractal_antenna https://en.wikipedia.org/wiki/Fractal_antenna
- xnzakg 2y agoWith the right pcb design you could use this to sneak in an entire microcontroller while making it seem like it's just an antenna, wild
- Sidnicious 2y agoThis one is ever so slightly smaller at 3.25 x 8.55 x 0.85mm: https://www.mouser.com/ProductDetail/TAIYO-YUDEN/EYSHSNZWZ?qs=AQlKX63v8Ru66vr3hg8chw%3D%3D&srsltid=AfmBOorQgBwedA_-bfV1WxTlImYyt3nKwOWh_puUl0A8Fmg6hDBbf0ks https://www.mouser.com/ProductDetail/TAIYO-YUDEN/EYSHSNZWZ?q... Six of them fit on the face of a dime, which is wild.
- thmsths 2y agoUnlike the FDK module, this module requires an external crystal oscillator, which makes me think that the total footprint ends up being larger.
- teleforce 2y agoTo be fair to Silicon Labs, they don't claim the smallest BLE module but FDK did exactly that [1]. [1] The world's smallest Bluetooth® Low Energy Module, the new model "HY0021": https://www.fdk.com/whatsnew-e/release20241021-e.html https://www.fdk.com/whatsnew-e/release20241021-e.html
- anonymous_user9 2y agoThe Hongjia HJ-131 is much smaller at 4x4x1.3mm https://www.renesas.com/en/document/dst/da14531-honjia-hj-131imh-datasheet https://www.renesas.com/en/document/dst/da14531-honjia-hj-13...
- ohazi 2y agoThis doesn't integrate the antenna, so it's not comparable.
- anonymous_user9 2y agoYes it does. The HJ-131 module has an onboard antenna that’s used by connecting pins 12 and 13.
- nimish 2y agoThis doesn't have MTP flash or anything though which is a bummer.