MAX11800_1010 Datasheet, PDF(37/59 Page) Maxim Integrated Products – Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

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MAX11800_1010 Datasheet, PDF (37/59 Pages) Maxim Integrated Products – Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

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Low-Power, Ultra-Small Resistive Touch-Screen

Controllers with I2C/SPI Interface

The second waveform shows an interrupt operation

assuming that aperture mode is disabled (or that ÎX =

ÎY = 0 LSB), assuming that the AP service interrupts at

a frequency faster than the selected TSC sample rate.

Every sample induces a FIFO event and an interrupt

pulse as shown. The interrupt waveform is significantly

busier than that shown in the first waveform. Duration

information can now be directly determined from the

FIFO samples since each sample is logged and occurs

at the programmed sample rate. Table 15 lists the read-

back data assuming the FIFO does not fill up.

The third waveform in Figure 16 shows an interrupt oper-

ation assuming that the MAX11800/MAX11801 are infre-

quently serviced. Ensure that the FIFO does not overflow.

No duration information is available at resolutions below

the servicing rate. Either the set of data shown in Table

14 or the set shown in Table 15 appears in the FIFO

when read, depending on the aperture setting.

Table 14. Readback and FIFO Contents with Aperture Mode Enabled

SAMPLE

TAG

COMMENT

Initial event (beginning of first touch)

Midpress event

Midpress event (last valid position data)

Release event (end of first touch, ignore position data)

Initial event (beginning of second touch)

Release event (end of second touch, ignore position data)

Table 15. Readback and FIFO Contents with Aperture Mode Disabled