TSC2014IYZGR datasheet(44/62 Pages) TI2

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TSC2014

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

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7.6.4.1.6

PR2-PR0

Precharge time selection. These bits set the amount of time allowed for precharging any pin capacitance on the

touch screen prior to sensing if a pen touch is happening.

Table 16. Precharge Time Selection

PR2

PR1

PR0

PRECHARGE TIME(tPRE)

20μs

84μs

276μs

340μs

1.044ms

1.108ms

1.300ms

1.364ms

7.6.4.1.7

SNS2-SNS0

Sense time selection. These bits set the amount of time the TSC2014 waits to sense whether the screen is

touched after converting a coordinate.

Table 17. Sense Time Selection

SNS2

SNS1

SNS0

SENSE TIME (tSNS)

32μs

96μs

544μs

608μs

2.080ms

2.144ms

2.592ms

2.656ms

7.6.4.1.8

DTW

Detection of pen touch in wait (patent pending). Writing a '1' to this bit enables the pen touch detection in the

background while waiting for the host to issue the converter function in host-initiated/controlled modes. This

background detection allows the TSC2014 to pull high at PINTDAV to indicate no pen touch detected while

waiting for the host to issue the converter function. If the host polls a high state at PINTDAV before the convert

function is sent, the host can abort the issuance of the convert function and stay in the polling PINTDAV mode

until the next pen touch is detected.

7.6.4.1.9

LSM

Longer sampling mode. When this bit is set to '1', the extra 500ns of sampling time is added to the normal

sampling cycles of each conversion. This additional time is represented as approximately two internal oscillator

clock cycles. For VDD = 1.2V at –40°C, the LSM bit should be set to '1' so that the sampled signal has enough

time to settle.

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