Cypress CY8CTMA340 TrueTouch 多点触控控制器详解

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"cypressTMA340文档是一份关于Cypress公司的TrueTouch系列多点触控屏控制器CY8CTMA340的数据表，详细介绍了该自电容触控IC的架构、功能特点以及调试方法。" 本文将深入探讨CY8CTMA340的主要特性、应用领域以及可能的使用场景。 CY8CTMA340是Cypress Semiconductor公司推出的一款TrueTouch系列的多点触控屏控制器，特别适用于智能手机、平板电脑和其他便携式设备的触摸界面。该芯片能够独立追踪四个手指的动作，支持最大4.5英寸对角线尺寸的屏幕。通过扩展传感器间距，它还能支持最大7英寸的屏幕。此外，它配备多达32个感应引脚，能识别多达252个交叉点，提供高度灵活的触控解决方案。 CY8CTMA340的一个显著特点是其对被动式触控笔的支持，即使笔尖直径仅为1毫米，也能实现类似电阻式触控笔的功能。这使得用户可以进行精确的输入操作，如绘图或手写识别。同时，该控制器具备卓越的防水性能，能有效防止水滴误触，确保在潮湿环境下的正常使用。为了适应各种环境变化，CY8CTMA340具有自我校准功能，能自动调整以应对温度、湿度等环境因素的影响。它还具备智能噪声抑制技术，可以有效抑制来自液晶显示器（LCD）、电池充电器、共模噪声以及射频（RF）环境的干扰，保证触控的准确性和稳定性。该控制器与Android和Windows Phone Series 7操作系统兼容，这意味着它可以在各种主流移动平台上无缝运行。另外，CY8CTMA340支持未调节的双电源输入，数字电源电压范围为1.71V至3.6V，模拟电源电压范围为2.7V至3.6V，这种宽泛的电压支持使其能适应不同电源条件。在实际应用中，CY8CTMA340不仅能够准确检测大物体（如手指）的触控，还能够跟踪并识别“胖手指”输入，确保大手指或戴手套的用户也能获得流畅的触控体验。配合Charger Armor技术，它提供了对电池充电噪声的免疫力，确保在设备充电时触控功能不受影响。 CY8CTMA340是一款高性能、高适应性的触控屏控制器，适用于需要高质量多点触控解决方案的电子设备。它的特性集成了先进的触控功能、抗干扰能力和环境适应性，为设计者提供了优化用户体验的强大工具。

PRELIMINARY

CY8CTMA340

CONFIDENTIAL – RELEASED ONLY UNDER NONDISCLOSURE AGREEMENT (NDA)

Document Number: 001-57308 Rev. *E Page 7 of 39

Power States Summary

The CY8CTMA340 controller includes a configurable power

state machine as shown in Figure 3. There are three separate

states:

■ Active, during which the touchscreen is actively scanned and

new touchscreen data is regularly refreshed

■ Low Power, during which the touchscreen is scanned at a much

slower rate to detect the presence of a finger

■ Deep Sleep, during which the touchscreen is not scanned and

the CY8CTMA340 controller is in a very low power state. The

internal clocks are turned off but the state of all registers and

RAM is maintained.

Figure 3. CY8CTMA340 Power States and Transitions

There are three parameters to configure the power state

machine: Active Refresh Interval (register ACT_INTRVL) defines

the minimum time between the start of subsequent touchscreen

scans in the active state; Touch Timeout (register TCH_TMOUT)

defines the time to stay in the Active state after the last finger is

removed from the touchscreen before transitioning to the Low

Power state; and Low Power Refresh Interval (register

LP_INTRVL) defines the time in the Low Power state between

touchscreen scans. The power state machine is active only when

the CY8CTMA340 controller is communicating in the operating

mode. In all other communication modes, the touchscreen is

scanned continuously. See Communications Protocol Summary

on page 11 for a detailed description of operating mode, system

information mode, and test mode.

At startup in Operating mode, the CY8CTMA340 controller

enters the Active power state. In the Active power state, the

controller periodically scans the panel, determines whether it is

being touched, identifies the finger centroid locations, and

processes these positions and motion into gestures.

In Active state, the Active Refresh Interval register specifies the

scanning/processing cycle interval in milliseconds. If a

touchscreen can be scanned and processed in less time than

specified by the Active Refresh Interval. The controller sleeps for

the remaining time to reduce power consumption. If the scanning

and processing time exceeds the specified actual scanning and

processing cycle interval by the ACT_INTRVL register, scanning

and processing cycles are executed continuously without any

idle or sleep time. Increasing the Active Refresh Interval value

decreases power consumption in the Active state but increases

touchscreen data refresh time.

If the host sets the Low Power bit (bit 2 of the HST_MODE

transitions from the Active state to the Low Power state, based

upon finger/touch activity. The Touch Timeout specifies the

minimum time duration (in 10-ms increments) the controller

remains in the Active state after its last detection of touch activity.

After no touch activity has been detected for this time duration,

the controller enters the Low Power state.

In the Low Power state, the Low Power Refresh Interval defines

how often the touchscreen is scanned. Unlike the Active state, in

the Low Power state the finger positions are not updated after a

scan; the controller is only scanning to see whether a finger is

detected. When a finger is detected, the controller transitions to

the active state and begins normal, regular touchscreen

scanning and processing. The host may also clear the Low

Power bit to force the CY8CTMA340 controller out of the Low

Power state and into the Active state. Also, if the host sets the

Deep Sleep bit (bit 1 of the HST_MODE register) while in the Low

Power state, the controller will transition to the Deep Sleep state.

To transition from the Active or Low Power states to the Deep

Sleep state, the host must set the Deep Sleep bit, after which the

CY8CTMA340 controller will put itself in an ultra-low power

condition instead of performing the next touchscreen scan. The

controller remains in the Deep Sleep state until the host pulls the

COMM INT pin low, after which the controller wakes up and

returns to the Active state.

Figure 3 illustrates the three power states and their transitions.

For more information on configuring the behavior of power states

in the CY8CTMA340, refer to the TrueTouch

Touchscreen

Controller Standard Product TRM (Technical Reference

Manual).

Active

Deep Sleep

Low Power

Host requests deep sleep

COMM INT pin

pulled low

Touch detected,

or host disables Low Power

Low Power enabled

and no touches detected

for Touch Timeout

Start

Host requests deep sleep

PRELIMINARY

CY8CTMA340

CONFIDENTIAL – RELEASED ONLY UNDER NONDISCLOSURE AGREEMENT (NDA)

Document Number: 001-57308 Rev. *E Page 8 of 39

Pin Information

The CY8CTMA340 is available in several packages. This section provides the pin names, descriptions, and mapping to the physical

package.

Table 1. 36-Pin QFN (CY8CTMA340-LQI-01, CY8CTMA340-LQI-03, CY8CTMA340-LQI-09, CY8CTMA340-LQI-11)

Pin No. Name Functions Pin Map

1 P0[1] Sense pin can be multiplexed to TX or RX channel 0

2 P0[3] Sense pin can be multiplexed to TX or RX channel 0

3 P3[0] Sense pin can be multiplexed to TX or RX channel 1

4 P3[1] Sense pin can be multiplexed to TX or RX channel 1

5 P3[2] Sense pin can be multiplexed to TX or RX channel 1

6 P3[4] Sense pin can be multiplexed to TX or RX channel 2

7 P3[5] Sense pin can be multiplexed to TX or RX channel 2

8 P3[6] Sense pin can be multiplexed to TX or RX channel 2

9 P0[4] Sense pin can be multiplexed to TX or RX channel 3

10 P0[7] Sense pin can be multiplexed to TX or RX channel 3

11 P2[7] Sense pin can be multiplexed to TX or RX channel 3

12 P4[3] Sense pin can be multiplexed to TX or RX channel 4

13 P4[2] Sense pin can be multiplexed to TX or RX channel 4

14 P4[1] Sense pin can be multiplexed to TX or RX channel 4

15 V

Connect to circuit ground

16 P1[0] ISSP DATA, SPI SCLK, I2C SDA

[3]

17 P1[1] ISSP CLK, SPI MOSI, I2C SCL

[3]

18 ADC Ref ADC reference output. Bypass with 0.47-µF capacitor

19 XRES Active LOW external reset with internal pull-up

20 P4[6] Sense pin can be multiplexed to TX or RX channel 5

21 P4[5] Sense pin can be multiplexed to TX or RX channel 5

22 P4[4] Sense pin can be multiplexed to TX or RX channel 5, SPI CLK

[4]

23 P1[7] I

C SCL, SPI SS

24 P1[5] I

C SDA, SPI MISO

25 P2[6] Sense pin can be multiplexed to TX or RX channel 6

26 P0[0] Sense pin can be multiplexed to TX or RX channel 6

27 P2[0] Interrupt to Host and Wake signal from Host

[5]

28 V

CPIN

Charge pump input, see Figure 2 on page 6 and Table 1 on page 8

29 V

CP-

Charge pump flying capacitor negative input, Figure 2 on page 6

30 V

CP+

Charge pump flying capacitor positive input, see Figure 2 on page 6

and Table 1 on page 8

31 V

CPO

Charge pump output, see Figure 2 on page 6 and Table 1 on page 8

32 V

Digital supply voltage, see Figure 2 on page 6 and Table 1 on page 8

33 P1[2] Sense pin can be multiplexed to TX or RX channel 7

34 P2[1] Sense pin can be multiplexed to TX or RX channel 7

35 P2[5] Sense pin can be multiplexed to TX or RX channel 7

36 P2[3] Sense pin can be multiplexed to TX or RX channel 0

EP – Exposed pad. Connect to circuit ground, see Figure 7 on page 26

Notes

3. Alternate I2C pins.

4. Alternate SPI clock.

5. This pin is set to COMM INT by default, the interrupt pin can be moved to any other pin if necessary. If this pin is not used for COMM INT it may be used as a sense

pin multiplexable to X or Y sensor. If this pin is used as a COMM INT pin it affects low power operation. Refer to the TrueTouch Touchscreen Controller Standard

Product TRM for further details.

QFN

(Top View)

P0[3]

P3[0]

P3[1]

P3[2]

P3[4]

P0[1]

P0[0]

P2[6]

P1[5]

P1[7]

P4[4]

[

]

[

]

[

]

[

]

[

]

36 35 34 33 32 31

[

]

[

]

[

]

P3[5]

[

]

P4[5]

P2[0]

[

]

P3[6]

P0[4]

[

]

P4[6]

XRES

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Cypress CY8CTMA340 TrueTouch 多点触控控制器详解

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