MAX1234EVC16 (Maxim Integrated Products) Datasheet资料下载 PDF(25/44 页)

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参数资料

型号：	MAX1234EVC16
厂商：	Maxim Integrated Products
文件页数：	25/44页
文件大小：	0K
描述：	EV SYSTEM/EV KIT MAX1233/MAX1234
产品培训模块：	Lead (SnPb) Finish for COTS Obsolescence Mitigation Program
标准包装：	1,000
系列：	*

±15kV ESD-Protected Touch-Screen

Controllers Include DAC and Keypad Controller

allowing certain keys to be masked from detection.

Tables 18–21 show the programmable bits of the keypad

control register. Tables 23, 24, and 25 show the program-

mable bits of the keypad mask registers. The Keypad

Controller and GPIO section provides more details.

GPIO Control Register

The GPIO control register and the GPIO pullup register

allow the keypad controller’s row and column inputs to be

configured as up to eight parallel I/O pins. Tables 26 and

27 show the GPIO control register layout and control reg-

ister descriptions. Tables 28 and 29 show the GPIO pullup

disable register and associated descriptions. For more

information, see the Applications Information section.

Table 21. Keypad Hold Time Control

HLD2

HLD1

HLD0

FUNCTION

If a button is held, wait 100μs before beginning next debounce scan

If a button is held, wait 1 debounce time before beginning the next debounce scan

If a button is held, wait 2 debounce times before beginning the next debounce scan

If a button is held, wait 3 debounce times before beginning the next debounce scan

If a button is held, wait 4 debounce times before beginning the next debounce scan

If a button is held, wait 5 debounce times before beginning the next debounce scan

If a button is held, wait 6 debounce times before beginning the next debounce scan

If a button is held, wait 7 debounce times before beginning the next debounce scan

Table 22. Keypad Key Mask Register Bit Descriptions (Write 0x0050/Read 0x8050)

BIT15

KM15

BIT14

KM14

BIT13

KM13

BIT12

KM12

BIT11

KM11

BIT10

KM10

BIT9

KM9

BIT8

KM8

BIT7

KM7

BIT6

KM6

BIT5

KM5

BIT4

KM4

BIT3

KM3

BIT2

KM2

BIT1

KM1

BIT0

KM0

Table 23. Keypad Key Mask Register Bit Descriptions (Write 0x0050/Read 0x8050)

BIT

NAME

KM15

KM14

KM13

KM12

KM11

KM10

KM9

KM8

KM7

KM6

KM5

KM4

KM3

KM2

KM1

KM0

DESCRIPTION

Mask status register data update on individual key for row 4, column 4

Mask status register data update on individual key for row 3, column 4

Mask status register data update on individual key for row 2, column 4

Mask status register data update on individual key for row 1, column 4

Mask status register data update on individual key for row 4, column 3

Mask status register data update on individual key for row 3, column 3

Mask status register data update on individual key for row 2, column 3

Mask status register data update on individual key for row 1, column 3

Mask status register data update on individual key for row 4, column 2

Mask status register data update on individual key for row 3, column 2

Mask status register data update on individual key for row 2, column 2

Mask status register data update on individual key for row 1, column 2

Mask status register data update on individual key for row 4, column 1

Mask status register data update on individual key for row 3, column 1

Mask status register data update on individual key for row 2, column 1

Mask status register data update on individual key for row 1, column 1

Table 24. Keypad Column Mask Register (Write 0x0051/Read 0x8051)