OSILayer1: Physical

Media,signalingandtransmission

OSILayer2: Datalink

LLCandMACsublayers(e.g.Physicaladdressing)

OSILayer3: Network

PathdeterminationandIP (e.g.Logicaladdressing)

OSILayer4: Transport

Endtoendconnectionsandreliability

M0210-01

OSILayer5: Session

Inter-hostcommunication

OSILayer6: Presentation

Datapresentationandencryption

OSILayer 7: Application

Applicationwrittentorunonthenetwork

UserDefined

ANT Protocol

2.4GHzRadio

M0211-01

HostMCU

(e.g.MSP430)

ANT

(e.g.CC2571)

UART orSPI

CC2570

CC2571

SWRS095A

– FEBRUARY 2011 – REVISED MARCH 2011

www.ti.com

Figure 1. ANT OSI Layers

The following sections offer a broad overview of the many features of ANT. For a detailed description of ANT and

ANT+, please visit www.thisisant.com or www.ti.com/ant.

ANT NODES

An ANT node is any device that is capable of ANT wireless communications. It typically coconsists of an ANT

chip, such as the TI CC2571, and an application host MCU, such as an MSP-430. The interface between the

ANT chip and the host MCU is serial UART or SPI, depending on the requirements of the application. There is

also a bit-synchronous serial protocol available, which may be fully implemented in software for very

resource-constrained systems. The overhead required to interface to ANT is minimal, typically requiring less than

1K of flash space to implement a simple API. A block diagram of an ANT node is depicted in Figure 2.

Figure 2. ANT Node

ANT nodes may host multiple ANT channel endpoints, up to eight for the CC2571. Examples of ANT nodes

include wireless watches, heart-rate straps, smart phones, glucose meters, blood-pressure monitors, and other

sports and medical sensors.

4

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© 2011, Texas Instruments Incorporated

Product Folder Link(s): CC2570 CC2571