HL8062

GENERAL DESCRIPTION

The HL8062 is the IC for measuring the ECG signal. The preamplifier is built in as a differential input amplifier for preprocessing heart signal from input sensors. There are some amplifiers can be configured as low pass filter and band pass filter for ECG signal processing and suppress noise signal which produced with heart signal from input sensors. With build-in A/D converter, the analog heart signal is sampled, the sample time is 1ms. The A/D converter allows conversion of an analog input signal to an 11-bit binary representation of that signal. There is an internal digital processor which detects rise time of the ECG’s R wave to generate digital heartbeat signals.

FEATURES

Smart design for amplifying and filtering pulse signal
Built in automatic gain control
Built in noise cancellation circuit
Built in Oscillator circuit
Built in A/D Converter and signal Processor
Built in Common Voltage
Good ESD protection

ABSOLUTE MAXIMUM RATING

Supply Voltage (VDD to GND) ------------------------- 3.3V

Input Voltage Range ------------------------- (GND- 0.3V) to (VDD + 0.3V)

Operating Temperature Range ------------------------ -2 0℃ to +60℃

ELECTRICAL CHARACTERISTICS

HL8059A (VDD=3.3V, GND=0V, Ta=+25℃, unless otherwise noted)

PARAMETER	CONDITIONS	MIN	TYP	MAX	UNITS
Operating Voltage	Figure 1		5		V
Standby Current	ENB=0V, Figure 1		0.01		uA
Operating Current	VDD=3V, ENB=3V, Figure 1		2		mA
Pulse Width of PULSE	VDD=3V, Figure 1		1*		mS
Input low voltage	Pin: ENB,CLK,DATA			0.8	V
Input high voltage	Pin: ENB,CLK,DATA	2.2			V
Output low voltage	Iout = -0.1mA , pin :READY,ECGPK,DATA,KEYO			0.1	V
Output high voltage	Iout = 0.1mA, pin :READY,ECGPK,DATA,KEYO	2.9			V

1*: Width of ECGPK is depending on the rise time of the ECG’s R wave

OPERATION OF THE SYSTEM

The way of communication between the HL8062 and the MCU is through SPI.
There are two connection methods according to the working voltage of the HL8062 and the MCU.

If the MCU and the HL8062 have the same working voltage, the connection method is as below.

If the working voltage of the MCU is higher than working voltage of the HL8062, it needs a regulator to generate low voltage to the HL8062.

DATA TRANSFER FROMAT

The data format which the MCU sends parameters to the HL8062 as below

There are some parameters need to send into the HL8062 before HL8062 acts.
Set the HL8062 according to the order in the following table.

PARAMETER TABLE

The data format which the MCU reads the ECG data of the HL8062 as below

The MCU can only read the data of HL8062 when the READY pin is high.

Reference value of voltage (VDD=3.3V)

PS: *Reference voltage formula
Voltage = ((VDD-0.5)/2047)* Decimal (D10~D0)
*The voltage value in the table is a reference voltage rather than an absolute value.

The Width of the ECGPK

The width of ECGPK is depending on the rise time of the ECG’s R wave