ZL70100

Data Sheet

2

Zarlink Semiconductor Inc.

1.0

Functional Description

1.1

General

The ZL70100 is an ultra low power, high bandwidth RF link for medical implantable applications. It operates in the

MICS (Medical Implantable Service Band) at 402-405 MHz. It uses a Reed-Solomon coding scheme together with

CRC error detection to achieve an extremely reliable link. For data-blocks, a maximum BER (Bit Error Rate) of less

BER is available using Housekeeping messages, a facility fully described in the ZL70100 Design Manual.

1.2

Basic Operation and Modes

The MICS transceiver is intended for operation in both an Implant and Basestation. These systems have different

requirements especially with regard to power consumption. Therefore, the MICS transceiver has defined two

fundamental startup modes of operation:

•

Implantable Medical Device (IMD) Mode

•

Basestation Mode

When configured as an IMD, the transceiver is usually asleep and in a very low current state. The IMD transceiver

may be woken up by either receipt of a specially coded 2.45 GHz wakeup message or directly by the IMD

processor via the WU_EN pin. This flexibility leads to the following options for waking up an IMD transceiver for

communication.

•

IMD transceiver woken up by specially coded 2.45 GHz wakeup message using an ultra low power sniffing

method.

•

IMD transceiver woken up to sniff 400 MHz link. The ZL70100 supports such a mode of operation although

the 2.45 GHz wakeup system has lower power consumption.

•

IMD transceiver woken to send an emergency message in which case no clear channel assessment by the

Basestation is required.

•

IMD transceiver woken up by a low frequency inductive link (as typically used in pacemakers/ICDs) or some

alternative mechanism.