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Texas Instruments

Bluetooth technology The Bluetooth interface on the WL1271 supports Bluetooth 1.2 (1 Mbps) and Bluetooth 2.0 + EDR (2-3 Mbps). This device leverages the open-source Blue-Z stack, which is part of the OMAP3530 processor and AM3517 Linux base ports. Figure 4 shows a standard Bluetooth stack.

The Continua PAN interface requires a new profile called HDP (health device profile), which is currently available for integration through open source. This profile is built on an additional abstraction layer called MCAP. Because Bluetooth was not originally designed to operate on inexpensive coin-cell batteries, the Bluetooth SIG is introducing a new derivative called Bluetooth low energy technology (BLE).

vCard/vCal

WAE

OBEX

WAP

UDP TCP

AT commands

TCS BIN

SDP

IP

PPP

RF COMM

Audio

L2CAP

Host controller interface

LMP

Baseband

B l u e t o o t h ® r a d i o

Figure 4: Standard Bluetooth® stack

Bluetooth low energy technology Unlike Bluetooth, Bluetooth low energy technology is a connectionless protocol. This significantly reduces the amount of time the radio must be on for applications that require very low cost, low-power wireless connectivity. Bluetooth low energy technology will open up Bluetooth to a variety of new markets, including health care, sports and fitness, security, mobile and PC accessories, and home entertainment.

Bluetooth low energy technology will be integrated into existing Bluetooth chipsets in what is referred to as dual-mode support and will additionally be available as a low-energy-only solution called single mode. In many (but not all) use cases, the dual-mode device will be incorporated into a cellular phone, PC, car or other less power-constrained devices that already use Bluetooth technology or have a desire to add Bluetooth support.

These devices will support the existing Bluetooth ecosystem (for example, cellular phones supporting hands-free headsets) and, with the dual-mode support, also allow single-mode low-energy sensors and devices to “attach.”

The single-mode chip will be designed into power-constrained devices (for example, coin-cell devices lasting a year or more) to support the various markets and applications in the low-power RF space.

Aggregation managers for the connected health system

July 2010

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