MAX11800_1010 Datasheet, PDF (50/59 Pages) Maxim Integrated Products – Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I²C/SPI Interface
General Configuration Register (0x01)
BIT
NAME
DEFAULT
7
RT_SEL
1
6
HOLD_DO
1
5
PU_IRQ
1
4
ODN_IRQ
1
3
MASK_IRQ
0
2
EDGE_IRQ
0
1
0
EDGE_TIME[1:0]
0
0
BIT
NAME
DESCRIPTION
MAX11800/
MAX11801
MAX11802/
MAX11803
0: 50k
touch-detection pullup resistance
7
RT_SEL
1: 100k
touch-detection pullup resistance
Yes
Yes
(panel setting—not to be confused with internal TIRQ pullup)
0: DOUT internal bus holder disabled
6
HOLD_DO
1: DOUT internal bus holder enabled
(applicable to SPI version only)
Yes
Yes
0: Disable IRQ internal pullup resistance
5
PU_IRQ
1: Enable IRQ internal pullup resistance
(open-drain mode only: ODN_IRQ also high)
Yes
Yes
4
ODN_IRQ
0: TIRQ is CMOS buffered output
1: TIRQ is open-drain nMOS output
Yes
Yes
3
MASK_IRQ
0: Enable TIRQ output
1: Mask/disable TIRQ output (force high or high-z)
Yes
Yes
2
EDGE_IRQ
0: Use continuous interrupt with direct conversion mode
1: Use edge interrupt with direct conversion mode
Yes
Yes
TIRQ low time for edge interrupt mode only
00: 4 x (2MHz oscillator clock period) = 2μs
1:0
EDGE_TIME[1:0] 01: 16 x (2MHz oscillator clock period) = 8μs
10: 64 x (2MHz oscillator clock period) = 32μs
11: 128 x (2MHz oscillator clock period) = 128μs
Yes
Yes
Measurement Resolution Configuration Register (0x02)
BIT
7
6
5
4
3
NAME
—
—
—
PWR_SAV
RESX
DEFAULT
0
0
0
0
0
2
RESY
0
1
RESZ1
0
0
RESZ2
0
BIT
NAME
DESCRIPTION
MAX11800/
MAX11801
MAX11802/
MAX11803
0: Internal ADC runs at normal power
1: Internal ADC runs at reduced power and resolution
4
PWR_SAV This mode does limit the effective ADC resolution:
12-bit conversions can be reduced to 10-bit accuracy
8-bit conversions should not be impacted
Yes
Yes
Resolution for X, Y, Z1, or Z2 measurements
3:0
RES_ 0: 12-bit conversion (see the PWR_SAV description in this table)
Yes
Yes
1: 8-bit conversion
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