參數(shù)資料
型號： 73S1217F-68MR/F/PE
廠商： Maxim Integrated Products
文件頁數(shù)： 105/140頁
文件大小： 0K
描述： IC SOC SMART CARD READER 68QFN
標準包裝： 2,500
系列： *
DS_1217F_002
73S1217F Data Sheet
Rev. 1.2
67
1.7.14 Keypad Interface
The 73S1217F supports a 30-button (6 row x 5 column) keypad (SPST Mechanical Contact Switches)
interface using 11 dedicated I/O pins. Figure 13 shows a simplified block diagram of the keypad
interface.
Scan
pu
ll-
up
Debouncing
D
e
boun
ce
Ti
me
7
6
5
4
3
2
1
0
KSIZE Register
6
(1) KCOL is normally used as Read only
register. When hardware keyscan mode
is disabled, this register is to be used by
firmware to write the column data to
handle firmware scanning.
(2) 1kHz internal clock signal can be
selected either from the PLL (= from the
12MHz main clock), or from the 32kHz
system clock.
K
ey_D
ete
ct
Hardware Scan Enable
6
Co
lu
mn
S
can
Or
der
5
Column Value
Row Value
Ke
y_De
tect
_E
nabl
e
KORDERL / H Registers
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
KCOL Register(1)
7
6
5
4
3
2
1
0
KROW Register
Dividers
1kHz (2)
Scan
Ti
me
KSCAN Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
KSTAT Register
Keypad Clock
VDD
pu
ll-
up
COL4:0
RO
W5:0
73S1217F
If smaller keypad than 6x 5 is to be
implemented, unused row inputs
should be connected to VDD. Unused
column outputs should be left
unconnected.
VDD
Figure 13: Simplified Keypad Block Diagram
There are five drive lines (outputs) corresponding to columns and six sense lines (inputs) corresponding
to rows. Hysteresis and pull-ups are provided on all inputs (rows), which eliminate the need for external
resistors in the keypad. Key scanning happens by asserting one of the 5 column lines low and looking for
a low on a sense line indicating that a key is pressed (switch closed) at the intersection of the drive/sense
(column/row) line in the keypad. Key detection is performed by hardware with an incorporated debounce
timer. Debouncing time is adjustable through the KSCAN register. Internal hardware circuitry performs
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73S1217F-EB-Lite 功能描述:開發(fā)板和工具包 - 8051 73S1217F EVB Lite w/Plug & Play/Usb RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓:
73S1217F-IMR/F 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Bus-Powered 80515 System-on-Chip with USB, ISO 7816 / EMV, PINpad and More
73S13B 制造商:QUARTZCOM 制造商全稱:QUARTZCOM the communications company 功能描述:-20 ~ +70 °C commercia l application -30 ~ +75 °C on request
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