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Overview of reference design
KW40 Heart Rate Monitor Using Bluetooth Low Energy, User's Guide, Rev. 0, 10/2015
2 Freescale Semiconductor, Inc.
2. Overview of reference design
The BLE Heart Rate Monitor reference design demonstrates the implementation of a wireless
electrocardiogram (ECG) acquisition system. It features the Freescale MKW40 system on chip (SoC)
which includes an ARM® Cortex
TM
M0+ processor together with a 2.4 GHz radio for BLE and
802.15.4.
The ECG signal is obtained from the finger tips and processed by the MKW40 SoC. Then, the user’s
heart rate is calculated and transmitted to a smartphone application using BLE.
Figure 1 shows a general
block diagram of the system implementation.
Figure 1. Application block diagram
A Li-Ion coin-cell battery is also included. The LIR3040 is a 3.6V 200mA/h rechargeable. The Freescale
MC34671 is included provide a battery charger solution for the device.
2.1. Get to know the BLE Heart Rate Monitor
Figure 2 highlights the most relevant parts of the hardware.