MAX1233_05 Datasheet, PDF (26/45 Pages) Maxim Integrated Products – ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 25. Keypad Column Mask Control Register Descriptions
BIT
15
14
13
12
[11:0]
NAME
CM4
CM3
CM2
CM1
0
DESCRIPTION
Mask interrupt, status register, and pending register data update on all keys in column 4
Mask interrupt, status register, and pending register data update on all keys in column 3
Mask interrupt, status register, and pending register data update on all keys in column 2
Mask interrupt, status register, and pending register data update on all keys in column 1
Reserved
Table 26. GPIO Control Register
BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 OE7 OE6 OE5 OE4 OE3 OE2 OE1 OE0
Table 27. GPIO Control Register Descriptions
BIT
15
14
13
12
11
10
9
8
[7:0]
NAME
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
[OE7:OE0]
1
C4 pin becomes GPIO pin 7
C3 pin becomes GPIO pin 6
C2 pin becomes GPIO pin 5
C1 pin becomes GPIO pin 4
R4 pin becomes GPIO pin 3
R3 pin becomes GPIO pin 2
R2 pin becomes GPIO pin 1
R1 pin becomes GPIO pin 0
GPIO pin configured as an output
DESCRIPTION
0
C4 pin remains keypad column 4
C3 pin remains keypad column 3
C2 pin remains keypad column 2
C1 pin remains keypad column 1
R4 pin remains keypad row 4
R3 pin remains keypad row 3
R2 pin remains keypad row 2
R1 pin remains keypad row 1
GPIO pin configured as an input
Table 28. GPIO Pullup Disable Register
BIT15 BIT14 BIT13 BIT12 BIT11 BIT10 BIT9 BIT8 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 0
0
0
0
0
0
0
0
Table 29. GPIO Pullup Disable Register
Descriptions
BIT
[15:8]
[7:0]
NAME
DESCRIPTION
[PU7:PU0] ^{1: Pullup disabled. Open collector output.}
2: Pullup enabled.
0
Reserved
Data Registers
The data results from conversions or keypad scans are
held in the data registers of the MAX1233/MAX1234.
During power-up, all of these data registers with the
exception of the DAC data register default to 0000_H.
The DAC register defaults to 1000_H.
Analog Input Data Registers
Table 30 shows the format of the X, Y, Z₁, Z₂, BAT1,
BAT2, AUX1, AUX2, TEMP1, and TEMP2 data registers.
The data format for these registers is right justified
beginning with bit 11. Data written through the serial
interface to these registers is not stored.
Keypad Data Registers
Table 31 shows the formatting of the keypad data reg-
isters, while Tables 32, 33, and 34 provide individual
register bit descriptions. These registers have the same
format as the keypad mask register. Each bit repre-
sents one key on the keypad. Table 35 shows a map of
a 16-key keypad. Data written through the serial inter-
face to these registers is not stored.
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