Toshiba’s miniaturized Bluetooth LE module, based on Nordic’s nRF52811 SoC, features an innovative antenna technology to provide wireless connectivity for highly space-constrained applications. The module with integrated antenna comes in a miniaturized 4 by 10 by 1mm form factor, weighs 0.09g and is the world's smallest Bluetooth LE module of its kind, according to Toshiba.
Toshiba’s proprietary SASP (Slot Antenna on Shielded Package) technology is designed to minimize the size of the module by using the shielded packaging to house part of the antenna. As a result, the amount of area the remaining length of antenna takes up on the module PCB, and the corresponding component exclusion zone (“keep-out zone”), is reduced compared to competing modules. In addition, unlike competing modules, the keep-out zone does not extend beyond the boundaries of the module’s PCB. This offers developers greater flexibility in placement of peripheral components such as connectors and sensors, for example on the backside of the end-product PCB, further reducing end-product size.
Powered by Nordic’s nRF52811 SoC, the Bluetooth module with SASP Technology includes not only the antenna, but two crystals, and the passive components for RF and DC-to-DC regulator operation. The module enables robust processing and multiprotocol wireless connectivity in applications where both space and cost are constrained – notably clothing/wearables such as smart watches, true wireless earbuds and ear-worn devices for health monitoring and exercise analysis, as well as various connected applications with a limited power supply for sending and receiving data from sensors.
The Nordic nRF52811 SoC at the heart of the module has been engineered to minimize power consumption with a fully-automatic power management system that reduces power consumption by up to 80 percent compared with the nRF51 Series.
Nordic’s nRF52811 multiprotocol SoC combines a powerful 64MHz, 32-bit Arm Cortex M4 processor, with a 2.4GHz radio (supporting Direction Finding, Bluetooth 5.2, Thread, Zigbee, IEEE 802.15.4, and proprietary 2.4GHz RF protocol software) featuring 4dBm output power with -97dBm sensitivity (at 1Mbps in Bluetooth 5 mode), and 192kB Flash memory plus 24kB RAM. The nRF52811 is the first product in Nordic’s low power wireless range to support Direction Finding, which brings precise positioning capability to the high throughput, long range, and enhanced coexistence capabilities of Bluetooth 5. The SoC is supplied with Nordic’s S112 SoftDevice, a Bluetooth 5-certified RF software protocol stack for building advanced Bluetooth LE applications. The S112 SoftDevice features Peripheral and Broadcaster Bluetooth LE roles, supports up to four connections, and enables concurrent role operation.
“We selected Nordic’s nRF52811 SoC for our Bluetooth module with SASP Technology due to the chip’s low cost, compact size, and low power consumption, combined with its generous Flash memory allocation,” says Keiju Yamada, SASP Project Leader for Toshiba. “Nordic provides impressive software and demo sample codes to aid development.”
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