TSC2014IYZGR datasheet(40/62 Pages) TI2

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TSC2014

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

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7.6.3.1 Touch Screen Scan Function for XYZ or XY

7.6.3.1.1

C3-C0 = 0000 or 0001

These scan functions can collaborate with the PSM bit that defines the control mode of converter functions. If the

PSM bit is set to '1', these scan function select commands are recommended to be issued before a pen touch is

detected in order to allow the TSC2014 to initiate and control the scan processes immediately after the screen is

touched. If these functions are not issued before a pen touch is detected, the TSC2014 waits for the host to write

these functions before starting a scan process. If PSM stays as '1' after a TSC-initiated scan function is

complete, the host is not required to write these function select bits again for each of the following pen touches

after the detected touch. In the host-controlled converter function mode (PSM = 0), the host must send these

functions select bits repeatedly for each scan function after a detected pen touch.

Note that the data registers may be updated while a host reading is in progress. Using the sequential read cycle

(see Figure 34) prevents the TSC from updating registers while a host reading is in progress. To ensure that the

XYZ or XY coordinates are correctly read, use the sequential read cycle to read the coordinates after the scan.

7.6.3.2 Touch Screen Sensor Connection Tests for X-Axis and Y-Axis

Range of resistances of different touch screen panels can be selected by setting the TBM bits in CFR1; see

Table 18. Once the resistance of the sensor panel is selected, two continuity tests are run separately for the X-

axis and Y-axis. The unit under test must pass both connection tests to ensure that a proper connection is

secured.

7.6.3.2.1

C3-C0 = 1001

PINTDAV = 0 during this connection test. A '1' shown at end of the test indicates the X-axis drivers are well-

connected to the sensor; otherwise, X-axis drivers are poorly connected. If drivers fail to connect, then PINTDAV

stays low until a stop bit (STS set to '1') is issued.

7.6.3.2.2

C3-C0 = 1010

PINTDAV = 0 during this connection test. A '1' shown at end of the test indicates the Y-axis drivers are well-

connected to the sensor; otherwise, Y-axis drivers are poorly connected. If the drivers are fail to connect, then

PINTDAV stays low until a stop bit (STS set to '1') is issued.

7.6.3.3 Touch Sensor Short-Circuit Test

If the TBM bits of CFR1 detailed in Table 18 are all set to '1', a short-circuit in the touch sensor can be detected.

7.6.3.3.1

C3-C0 = 1011

Reserved.

7.6.3.3.2

C3-C0 = 1100

PINTDAV = 0 during this short-circuit test. A '1' shown at end of the test indicates there is no short-circuit

detected (through Y-axis) between the flex and stable layers. If there is a short-circuit detected, PINTDAV stays

low until a stop bit (STS set to '1') is issued.

7.6.3.3.3

Resolution select. If RM = 1, the conversion result resolution is 12-bit; otherwise, the resolution is 10-bit. This bit

is the same RM bit shown in CFR0.

7.6.3.3.4

SWRST

Software reset input. All register values are set to default value if a '1' is written to this bit. This bit is

automatically set to '0' in order to cancel the software reset and resume normal operation.

TSC2014IYZGR Datasheet(PDF) 40 Page - Texas Instruments

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