STMPE16M31 datasheet(60/85 Pages) STMICROELECTRONICS

60 / 85 page

Touch sensor controller

STMPE16M31, STMPE24M31

60/85

Doc ID 16174 Rev 4

13.7

Ratiometric engine

The STMPE16M31/24M31 support ratiometric slider/wheel implementation where a very

high number of steps could be obtained from relatively few physical sensing channels. The

high number of steps is derived from the ratio of capacitance sensed between neighboring

channels.

To use the ratio engine, the system must:

–

Define a range of channels (must be continuous) between 3-8 channels to be

–

Used as slider/wheel input

–

Select slider/wheel configuration

–

Select noise filter setting

–

Enable ratio engine

–

After each set of data access, the RE bit in interrupt status register must be

cleared.

Figure 17.

Configuration of ratio

Table 15.

Ratiometric engine registers

Address

Reset value

R/W

Description

0x80

RATIO_ENG_SET

0x00

General setup of ratio engine

0x81

RATIO_ENG1_CFG

0x00

Configuration of ratio engine 1

0x82

RATIO_ENG2_CFG

0x00

Configuration of ratio engine 2

0x83

RATIO_ENG_STA

0x00

Status of ratio engine

0x84

RATIO_ENG1_DATA

0x000000

Output data of ratio engine 1

0x87

RATIO_ENG2_DATA

0x000000

Output data of ratio engine 2

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