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4-Key Capacitive Touch Module (BMCOM) BMK52M134

US$2.80

In stock

Quantity

154 pieces

Product ID

BMK52M134

The BMK52M134 is a capacitive touch module with four keys arranged in a 2x2 array. Up to four BMK52M134 modules can be cascaded, and you can read or control the keys through the I²C interface.

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DESCRIPTION

When a finger touches the copper trace area on the PCB representing the switch area, the capacitance of this area will change. The BMK52M134 determines the output status of the INT pin by detecting this change.

You can cascade up to four BMK52M134 modules simultaneously, and when cascading, you only need to connect one of them to the development board.

The development board reads the keys’ statuses via I²C interface and lights up the corresponding LED. Sensitivity of the touch keys can be individually configured based on your application. For instance, when you place an acrylic panel on the BMK52M134, the capacitance of the affected copper foil area decreases. Consequently, the keys may require higher sensitivity.

There is a BMCOM on the product to directly connect to BMduino development boards, such as BM53A367A. You can use the product with other development boards, such as Arduino UNO, as well.

PRODUCT FEATURES

Operating voltage: 2.5V~5.5V
Operating current:
- 1.41mA @3.3V (non-touched)
- 5.91mA @3.3V (all keys are touched and all LEDs light up)
Standby current: 0.02mA @3.3V
- Automatically enters standby mode if no touch is sensed within 8 seconds
- When the module is in standby mode, it can only be awakened by a touch
Can cascade up to four BMK52M134 modules simultaneously
Sensitivity of keys can be configured individually
- 55 levels (10 to 64, default 16)
- The smaller the value, the higher the sensitivity
Interface: I²C (address: 0x71)
Dimension: 33.8 x 38.56 x 6.5 mm
Net weight: 6g
Product includes: BMK52M134 x1, 2x2P header x1

HARDWARE OVERVIEW

PIN DESCRIPTION

Rear of the BMK52M134

Pin	Pin name	Function
1	INT	Sensed a touch: output low level Non-sensed: output high level
2	SCL	I²C: clock line
3	SDA	I²C: data line
4	VDD	Power supply: 2.5V~5.5V
5	GND	Ground
6	GND	Ground
7	VDD	Positive power
8	ST_O	Cascade status output
9	TRX	Cascade single-bus communication pin
10	VDD	Positive power
11	GND	Ground
12	ST_I	Cascade status input
13	TRX	Cascade single-bus communication pin

PRODUCT FAQs

Question 1: Can touch keys senses even if I put glass or acrylic on it?

Answer: Sure, you can put glass or acrylic with the maximum thickness of 3mm on the board, and it is recommended to configure sensitivity of touch keys to achieve the best touch feedback.

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