MAX11800ETC/V+T Maxim Integrated Products, MAX11800ETC/V+T Datasheet - Page 37

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MAX11800ETC/V+T

Manufacturer Part Number
MAX11800ETC/V+T
Description
IC TOUCH SCREEN CTRLR LP 12WQFN
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11800ETC/V+T

Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
12 b
Data Interface
Serial, SPI™
Data Rate/sampling Rate (sps, Bps)
105k
Voltage - Supply
1.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-WQFN Exposed Pad
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The second waveform shows an interrupt operation
assuming that aperture mode is disabled (or that ΔX =
ΔY = 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
Table 14. Readback and FIFO Contents with Aperture Mode Enabled
Table 15. Readback and FIFO Contents with Aperture Mode Disabled
Low-Power, Ultra-Small Resistive Touch-Screen
SAMPLE
SAMPLE
2b
1a
2a
2c
3a
1
2
3
4
5
6
7
1
2
3
4
5
6
7
11
13
17
19
22
23
11
12
13
13
13
15
17
19
22
23
X
7
X
7
9
______________________________________________________________________________________
11
14
15
11
10
14
15
Y
9
5
7
6
Y
9
8
7
6
5
6
7
6
Controllers with I
TAG
TAG
00
01
01
01
10
00
10
00
01
01
01
01
01
01
01
01
10
00
10
Initial event (beginning of first touch)
Midpress event
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)
Initial event (beginning of first touch)
Midpress event
Midpress event
Midpress event
Midpress event
Midpress event
Midpress event
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)
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.
2
COMMENT
COMMENT
C/SPI Interface
37

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