BPI-PC101 gesture recognition module

Introduction

The PC101 integrates an ambient light (ALS) sensor, a proximity sensor (PS) and 6-D gesture sensors with built-in IR LED. It is used in notebook PCs, smartphones, MIDs (mobile internet devices),PNDs (portable navigation devices), e-books, tablet PCs, flat-panel televisions, etc. for extending battery life and for better user experience. Ambient light sensor optimizes the screen brightness to extend battery and to increase battery life. Proximity sensor (PS) measures the IR reflection intensity which correlates to the distance of the object. Proximity sensor enables the device controller to turn off the LCD back-light and the touch-screen sensor when the device is held close to your ear, placed inside the pocket, purse, or bags. This function saves the battery power and avoids unintended touch-screen trigger. Proximity sensor can also work as a device wake-up sensor by sensing the user waving the hand in front of the device. The 6-D gesture sensor detects the waving of palm in front of the screen in 6 directions left, right, up, down and z-axis. The hand gesture without the need to touch the screen adds new way of human device interaction. For example, the gesture can be used to accept a phone call in the hand-free mode while the user is driving in a car. In another example, the user wave to the screen to advance or retract in the picture viewing mode without worrying the food stains from the fingers to be left on the screen.

Key Features

• Digital control and data output via I2C (100 KHz and 400 KHz) interface
• ALS, PS and Gesture sensor with built-in IR LED
• Slave Address 0x58
• 6D Gesture Recognition Distance: 20~200 mm（up、down、left、right、hold）
• Programmable interrupt function for ALS and PS with upper and lower thresholds
• Support interrupt notification

Applications

• smart lights
• Household electrical control
• Music control equipment
• Game equipment
• Smart bath
• Distance detection
• Smart toy

Hardware

Interface

Block Diagram

PC101 DFN Pin Assignment

PC101 PIN definitions

PC101 Gesture Sensor Pin define
Pin	Name	Description
1	5V	Power
2	GND	Ground
3	INT	Digital Out
4	SCL	Serial Digital Input Clock
5	SDA	Serial Digital I/O Data
6	TXD	Serial port sends pins
7	RXD	The serial port receives the pin

Application Circuit

Electrical Characteristics

• Voltage characteristic

Voltage characteristic
No	pin	MIN	TYP	MAX	UNIT
1	5V	4.5	5.0	5.5	V
2	GND	-0.3	0	0.3	V
3	INT	GND	0/3.3	3.7	V
4	SCL	-0.3	0/3.3	3.7	V
5	SDA	-0.3	0/3.3	3.7	V

• Digital interface characteristics

Digital interface characteristics
No	Description	MIN	TYP	MAX	UNIT
1	SCL/SDA：LOW	-0.3	-	1.0	V
2	SCL/SDA：HIGH	2.3	-	3.6	V
3	SCL	0	-	400	kHz
4	Pull-up resistors	-	2.0	-	kΩ
5	INT：LOW	-	-	0.4	V
6	INT：HIGH	2.4	-	-	V

I2C interface

I2C interface '
Ordering Chip Information	Write to Slave	Read from Slave
PC101	1011000	1011001

• Receive (Single Read) data from register

• Send (Single Write) data into register

Principles of Operation

Total register addresses are maintained inside the I2C block, each having a 8-bit register address. Each address accommodates an 8-bit data register that can be either written or read via I2C. The command registers program the sensor for various modes, setting and Interrupt threshold. The read-only registers contains output codes.

• Register Table and Definitions

Register Table and Definitions
NAME	R/W	8-bit Address	Default	Descrition
ChipID	R	0x00	0xAA	Chip ID
Capability	R	0x01	0xF0	Gesture Functional description
LibVersion	R	0x02	0xB1	Gesture Version
Gesture	R	0x03	0x00	Gesture Data
Proximity	R	0x04	0x00	Distance

• 0x00： ChipID

This address holds ChipID, which is 0xAA by default and can be read to verify that I2C reading is normal.

• 0x01： Capability

This address holds a bitmap of the gesture detection capability, 0 Disable, 1 enable.

Digital interface characteristics
BIT	7	6	5	4	3	2	1	0
Read	Proximity	Hold	Left/Right	Up/Down	Reserved	Reserved	Reserved	Reserved
Reset	1	1	1	1	0	0	0	0

The default is all supported, so the register defaults is 0xF0.

• 0x02： LibVersion

This address holds Gesture Version defaults is 0xB1.

• 0x03： Gesture Date

The address is stored with the result of gesture detection.

address of gesture detection
0：	Gesture（Hold）	0xA0
1：	Gesture（Up）	0xA1
2：	Gesture（Down）	0xA2
3：	Gesture（Left）	0xA3
4：	Gesture（Right）	0xA4

• 0x04： Proximity Date

This address holds the distance of the gesture from 0 to 255, the larger is near, the smaller is far.

How to Start

Use Uart

Connect product like the Circuit diagram , Set the Baud Rate as 115200

Using TTL-USB moudle, you can see the data like the picture

Use I2C

Connect product like the Circuit diagram

Set the SlaveAddress as 0x58,

Read Register 0x00, and result is 0xAA.

So, the I2C communicate success.

Plan one : Polling

Every 100ms read once gesture data.

Read Register 0x03, and result is Gesture data.