BU21029GUL-E2 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Other integrated circuit (IC)> Consumption circuit> BU21029GUL-E2

BU21029GUL-E2: DescriptionTouch Screen Controllers; CategoryOther integrated circuit (IC) Consumption circuit; File Size743KB，30 Pages; ManufacturerROHM Semiconductor; Websitehttps://www.rohm.com/; Environmental Compliance

Download Datasheet Parametric View All

BU21029GUL-E2 Online Shopping

Suppliers	Part Number	Price	MOQ	In stock
	BU21029GUL-E2	-	-	View	Buy Now

BU21029GUL-E2 Overview

Touch Screen Controllers

BU21029GUL-E2 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
package instruction	VFBGA,
Reach Compliance Code	compliant
Factory Lead Time	13 weeks
Commercial integrated circuit types	CONSUMER CIRCUIT
JESD-30 code	S-PBGA-B16
length	2 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-20 °C
Package body material	PLASTIC/EPOXY
encapsulated code	VFBGA
Package shape	SQUARE
Package form	GRID ARRAY, VERY THIN PROFILE, FINE PITCH
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Maximum seat height	0.55 mm
Maximum supply voltage (Vsup)	3.6 V
Minimum supply voltage (Vsup)	1.65 V
surface mount	YES
Temperature level	OTHER
Terminal form	BALL
Terminal pitch	0.5 mm
Terminal location	BOTTOM
Maximum time at peak reflow temperature	NOT SPECIFIED
width	2 mm
Base Number Matches	1

Preview

Download Datasheet

View All

Datasheet

4-wire Resistive

Touch Screen Controller

BU21029GUL

●General

Description

Unlike most resistive touch screen controllers, the

BU21029GUL 4-wire resistive touch-screen controller

can generate data that enables dual touch detection.

The Host processor can use this data to detect single

and dual point coordinates.

●Features

■

Single and dual touch detection for standard 4-wire

resistive touch screens

■

I2C-like interface for interfacing with the host

processor

■

12-bit resolution

■

Single 1.65V to 3.60V supply

■

Power on reset

■

Auto power down control

■

Built-in clock oscillator circuit

●Key

Specifications

■

Power supply voltage

■

Temperature range

■

Standby current

■

Sleep current

■

Operating current

■

Coordinate resolution

●Package

VCSP50L2

1.65[V]½3.60[V]

-20[℃]½85[℃]

1.0[uA] (Max.)

100[uA] (Typ.)

0.8[mA] (Typ.)

12bit

2.00 mm x 2.00 mm x 0.55(max) mm

●Applications

■

Equipment with built-in user interface for 4-wire

resistive touch screen

■

Portable information equipment like smart phones,

tablets, and PDAs

■

Audio-visual equipment like digital still cameras,

digital video cameras, and portable TVs

■

PCs or peripheral equipment like laptops, touch

screen monitors, and printers

●Typical

Application Circuit

VDD

Host IO VDD

1.0uF

0.1uF

1.0uF

Regulator

option(*1)

Y+

10ohm

1.0nF

10ohm

1.0nF

AUX

Panel

I /F

(10bit)

BU21029GUL

ADC

Host

I /F

RSTB

SCL

SDA

INT

option(*2)

X-

Y-

X+

10ohm

1.0nF

10ohm

Host

( GPIO port )

4 - wire

resistive

touch

screen

1.0nF

AD0

AD1

TVS diode

option(*3)

OSC

Option(*1) For Noise protection

Option(*2) Please connect to VDD, when use as slave address = "41h".

Option(*3) For ESD protection.

Clock

generator

〇Product

structure : Silicon monolithic integrated circuit

〇This

product has no designed protection against radioactive rays

www.rohm.co.jp

TSZ02201-0Y1Y0F300120-1-2

1/26

TSZ22111 • 14 • 001

11.Nov.2013 Rev.002

BU21029GUL

●Block

Diagram

Datasheet

PVDD

LDO

AUX

Touch

Screen

Drivers

& I/F

VDD

LDO

VREF

OSC

PENIRQ

SAR

ADC

Control

Logic

2 wire

Serial

I/F

INT

SDA

SCL

AD0

AD1

POR

PGND

GND

RSTB

●OVERVIEW

BU21029GUL is a controller for 4-wire resistive touch screens. It has built-in 12-bit SAR A/D converter, clock oscillator,

power on reset circuit, and LDO regulator for internal blocks and operates with 1.65-3.60V single power supply. Aside from

being able to detect single point coordinates and touch pressure like existing 4-wire resistive touch screen controllers can,

it can also detect dual coordinates by generating data based on the prearranged touch screen parameters.

Communication between BU21029GUL controller and the host processor uses 2-wire serial interface. The BU21029GUL,

being the I2C slave device, is controlled by the host processor by writing to its registers. This way, the host processor sets

whether the touch screen controller operates under command control mode or under automatic control mode. In automatic

control mode, the host processor reads the touch data saved by the controller in its internal registers at any time.

Preprocess

A/D conversion is continuously done for several times in one driving time. Data is median average processed; meaning

data is sorted and calculation that takes the average from the center of the sorted data is performed.

Interrupt control

The BU21029GUL sends an interrupt signal to the host processor through INT, an active-low pin, whenever it detects touch

on the screen. In automatic control mode, this happens after the scan of the first touch is completed.

2-point detection function

The 2-point detection function of BU21029GUL can be used by calibrating the circuit for 2-point detection based on the

inherent panel perimeters (registers 0x3, 0x4). Since the characteristics of each touch panel differ significantly, it is

necessary for the host processor to execute the calibration of parameters to match the 2-point detection circuit of

BU21029GUL with every touch panel.

Power control

After a conversion function has been completed, the BU21029GUL automatically powers down in order to reduce current

consumption. In automatic control mode, scanning restarts automatically from power down when the touch screen is

operated.

Power on reset

BU21029GUL has built-in power-on-reset circuit. If the host processor will not be used to control RSTB pin, RSTB pin can

be shorted to VDD. This way, the registers of BU21029GUL initialize upon power-on.

www.rohm.co.jp

TSZ22111・15・001

3/26

TSZ02201-0Y1Y0F300120-1-2

11.Nov.2013 Rev.002

Recommended Resources

Universal motor speed control circuit diagram with load-dependent feedback

ISO120-121 functional diagram

High-low temperature sensor

Charge pump voltage converter series connection 4 times voltage circuit diagram

555 touch bistable controller circuit

555 frequency multiplier circuit with 50% duty cycle

Kernel protection and digital signature: Under WINCE 6.0, EXE and DLL under the kernel can run normally, and EXE and DLL with external digital signature can also run under this kernel. Any EXE and DLL without digital signature cannot run. I ...; hovel Embedded System

Infineon MERUS Class D Audio Solution | [Read to win gifts, place an order to get a development board]: Infineon aims to create advanced audio products. While adhering to the principle of quality first, it also takes into account user experience during development to ensure that it can bring customers a...; EEWORLD社区 Discrete Device

How to use request_region()?: Can anyone give me an example? For example, I want to use the I/O port C of the arm chip, that is, GPGC, and use several of its ports, such as 8~11. How to call this function? Looking forward to the a...; fujianfeng Embedded System

【AT-START-F403A Review】+ Display driver for color OLED screen: AT32F403A has 1024 K bytes of memory and 96+128 K bytes of SRAM, and is also equipped with up to 16 M bytes of SPI flash memory. Faced with such rich storage resources, it would be a bit unfair if it ...; jinglixixi Domestic Chip Exchange

[DWIN Serial Port Screen] Data Storage of Nucleic Acid Sampling and Registration System: 【DWIN Serial Port Screen】Nucleic Acid Sampling and Registration System 1 - Domestic Chip Exchange - Electronic Engineering World - Forum (eeworld.com.cn) [DWIN Serial Port Screen] Nucleic Acid Samplin...; lugl4313820 Domestic Chip Exchange

In 51, what does the CPU use to decide which addressing mode to use? Can you give an example?: In 51, what does the CPU use to decide which addressing mode to use? Can you give an example?...; leadsky Embedded System

Shortcut: 00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

Popular Components