LPS22HB click

Product Code: MIKROE-2665

Brand: MikroElektronika

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LPS22HB click is an easy solution for adding a digital barometer to your design. It carries the LPS22HB MEMS nano pressure sensor. The click is designed to run on a 3.3V power supply. LPS22HB click communicates with the target microcontroller over I2C or SPI interface.

How the click works

LPS22HB click carries the pressure sensor that measures 260-1260 hPa absolute pressure. Pressure values are then read out from the IC’s registers, through I2C or SPI communication.

LPS22HB sensor features

The LPS22HB is an ultra-compact piezoresistive absolute pressure sensor which functions as a digital output barometer.

The sensing element, which detects absolute pressure, consists of a suspended membrane. When pressure is applied, the membrane deflection induces an imbalance in the Wheatstone bridge piezoresistances, whose output signal is converted by the IC interface.

The sensor has a 24-bit pressure data output and a 16-bit temperature data output.

Specifications

Type	Pressure,Altitude
Applications	Barometers for portable devices, GPS applications, Weather station equipment, etc.
On-board modules	LPS22HB pressure sensor
Key Features	260 to 1260 hPa absolute pressure range
Interface	I2C,GPIO,SPI
Input Voltage	3.3V
Compatibility	mikroBUS
Click board size	M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on LPS22HB click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	INT	Interrupt or Data Ready
SPI enable	CS	3	CS	TX	14	NC
SPI Clock	SCK	4	SCK	RX	13	NC
SPI serial data output	SDO	5	MISO	SCL	12	SCL	I2C serial clock
SPI serial data input	SDI	6	MOSI	SDA	11	SDA	I2C serial data
Power supply	+3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Maximum ratings

Description	Min	Typ	Max	Unit
Supply VOltage (Vdd)	1.7		3.6	V
IO supply voltage(Vdd_IO)	1.7		Vdd+0.1	V
Overpressure			2	MPa
Operating pressure range	260		1260	hPa
Pressure sensitivity		4096		LSB/hPa

Jumpers and settings

Designator	Name	Default Position	Default Option	Description
JP1	COM SEL	Right	SCL(I2C)	Clock communication line Selection SCK/SCL, left position SCK, right position SCL
JP2	COM SEL	Right	SDA(I2C)	Data communication line Selection SDI/SDA, left position SDI, right position SDA
JP3	COM SEL	Right	ADD(I2C)	Communication Interface lines Selection SDO/ADD, left position SDO, right position ADD
JP4	ADD SEL	Right	0	Less significant bit of the I2C slave address selection 1/0, left position 1, right position 0.
JP5	COM SEL	Right	I2C	Communication interface selection CS/I2C, left position CS, right position I2C

LEDs and buttons

Designator	Name	Type	Description
PWR	PWR	LED	Power LED, lights green when Board is powered.

Programming

Code examples for MCP1664 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the main function of the example, which first calls the initialization functions, and then reads and outputs temperature and pressure values every 5 seconds

01 void main()
02 {
03     char uartTxt [20];
04     systemInit();
05     LPS22HB_initDriver (0x5C, I2C1_Start, I2C1_Write, I2C1_Read );
06     Uart1_Write_Text ("rnInitialized");
07     
08    while( 1 )
09     {
10          Uart1_Write_Text ("rnTemperature: ");
11          FloatToStr ( LPS22HB_readTemperature (), uartTxt);
12          uartTxt [5] = '';
13          Uart1_Write_Text (uartTxt);
14 
15         Uart1_Write_Text ("    Pressure: ");
16          FloatToStr ( LPS22HB_readPressure (), uartTxt);
17          uartTxt [8] = '';
18          Uart1_Write_Text (uartTxt);
19         
20          Delay_ms (5000);
21     }
22 }