TTP229 16-Channel Touch Detector IC

25 September 2020 - 0 Comments

TTP229 Touch Detector IC

TTP229 Pinout

TTP229 is an 8 to 16-channel touch detector IC that could be used as an 8 to 16 touch key driver. It is a useful device when replaced with a traditional button key. It has a low power consumption with a wide range of operating voltage. The major advantage of TTP229 is that it could replace the standard 8-key matrix keypad.

It has an auto-calibration feature for life and it has a re-calibration period of about 4.0 seconds. The sensitivity can be adjusted using an external capacitor of 0 to 50 pF. 16 or 8, whatever inputs are used, the IC features fewer component counts during the integration in the system.

Pin Description of TTP229

Pin Number	Pin Name	Description
1	-	-
2	-	-
3	-	-
4	-	-
5	SLPSENA	Sleep mode sensitivity adjustment pin for the group-A(TP0-7)
6	TP3	A touchpad input pin (KEY-3) Key action function option-1 (Single key/Multi key) Default is all single key
7	-	-
8	TP2	A touchpad input pin (KEY-2) key number function option (8-keys/16-keys) Default is all 8-keys
9	SENADJ0	Touchpad TP0-3 sensitivity adjust common pin
10	TP1	A touchpad input pin (KEY-1) Output type function option (Active high/low) Default is active high FOR TPQ0~7, active low for 2-wires serial type (SCL/SDO)
11	TP0	A touchpad input pin (KEY-0) Output type function option (COMS/OD/OC for 8-keys) Default is COMS
12	TP15	A touchpad input pin (KEY-15) 8-keys direct output pin (TPQ7)
13	TP14	A touchpad input pin (KEY-14) 8-keys direct output pin (TPQ6)
14	SENADJ3	Touchpad TP12-15 sensitivity adjust common pin
15	-	-
16	TP13	A touchpad input pin (KEY-13) 8-keys direct output pin (TPQ5)
17	-	-
18	TP12	A touchpad input pin (KEY-12) 8-keys direct output pin (TPQ4)
19	-	-
20	SDA	Data pin for the 1-C bus serial data interface
21	SDO	Data pin for the 2-wires serial output, option active Low/High by TPI
22	SPL	Serial clock input pin for serial type At 2-wires serial type can be set active Low/High by TPI
23	SLPSENB	Sleep mode sensitivity adjustment pin for group B(TP8-15)
24	TP11	Touchpad input pin (KEY-11) 8-keys direct output pin (TPQ3)
25	TP10	Touchpad input pin (KEY-10) 8-keys direct output pin (TPQ2)
26	SENADJ2	Touchpad TP8-11 sensitivity adjust common pin
27	TP9	Touchpad input pin (KEY-09) 8-keys direct output pin (TPQ1)
28	TP8	Touchpad input pin (KEY-08) 8-Keys direct output pin (TPQ0)
29	TEST	Only for test
30	-	-
31	A2	A2-0 are input pins for the IC bus device address selection
32	A1	A2-0 are input pins for the IC bus device address selection
33	A0	A2-0 are input pins for the IC bus device address selection
34	SLSERT	The option pin for serial output type selection Default is 2-wires serial type
35	TP7	Touchpad input pin (KEY-7) Maximum key on time function option (infinite/60sec) Default is infinite
36	TP6	Touchpad input pin (KEY-6) Sleep mood sampling length function option (4.0/2.0mS)
37	SENADJ1	Touchpad TP4~7 sensitivity adjust common pin
38	TP5	Touchpad input pin (KEY-5) sampling rate at sleep mode function option (8Hz/64Hz) Default is 8Hz
39	TP4	Touchpad input pin (KEY-4) Key action function option-0(Single key/Multi key) Default is all single key
40	-	-
41	VDD	Positive power supply
42	-	-
43	VREG	Internal regulator output pin
44	ENSLP	Sleep mode enable/disable function option Default is enable
45	VSS	Negative power supply, ground
46	REGEN	Internal regulator enable/disable function option Default is enable
47	-	-
48	-	-

Features and Specification of TTP229

16-channel maximum touch key sensing
Inbuilt regulator for touch sensors
Operating voltage - 2.4V - 5.5V for built-in regulator mode
Operating voltage - 2.0V - 5.5V for built-in regulator disabled
Operating current 2.5uA typically in 16-key mode. Operating current 2.0uA for 8-key mode.
I2C enabled for communication with host.
Adjustable sensitivity using an external capacitor (1-50 pF)
Stable touch detection of the human body
All output modes can be configurable for high or active low by pad options.
Direct mode and Toggle mode selection pin available
Auro calibration feature for life. The re-calibration period is about 4.0sec when the key has not been touch.
Provides one output pin TPQ0D that has no diode protection circuit inbuilt and it is active low
Provides fast mode and low power mode selection by pad optional (LPMB pin).
Provides direct mode or toggle mode, CMOS output, or open-drain output. active high or active low by option (TOG/AHLF/OD pin).

Note: Complete technical details can be found in the TTP229 Datasheet, linked at the bottom of this page.

Alternative product of TTP229

The below are the equivalent for TTP229 touch controller IC-

1. ADS7843

2. TTP226

3. TTP229

TTP229 Touch Controller IC - Overview

The TTP229 touch controller is the exact noncontact alternative of traditional button switches or matrix keypads. It also has an I2C interface to communicate with the host controller.

The IC uses an onboard sense pad that uses copper trace as a touch element and the touch sensitivity can be configured using an additional external capacitor ranging from 1 to 50pF. The IC uses group functions where 4 groups are available in 16-bit mode and 2 groups are available in 8-bit mode. Using the external capacitors, each group could individually be controlled for sensitivity related issues.

There are two pins, TP3 and TP4 that could be used to configure the single key or multi-key function. It also allows the user to group the keys. The configurable output is set by those two pins as per the below chart.

TTP229 Pin Configuration

Application Diagram for TTP229

The below image is showing the standard interfacing of the touch sensor. It requires basic components followed by the sense pads.

TTP229 Application Diagram

Follow the below guidelines for PCB design-related purposes-

Place the Sense pads as close as possible to the IC
Do not use a mechanical enclosure
Use the proper filter and bypass capacitor to reduce noises or ripple in the input supply
Place the capacitor C2 as close as possible.
Use an X7R or NPO rated capacitor for better accuracy over a wide temperature.