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LM8330 Datasheet(PDF) 12 Page - Texas Instruments

Part # LM8330
Description  LM8330 I2C-Compatible Keypad Controller with GPIO, PWM, and IEC61000 ESD Protection
PDF  54 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM8330 Datasheet(HTML) 12 Page - Texas Instruments

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LM8330
SNVS839A – JUNE 2012 – REVISED MARCH 2013
www.ti.com
KEYSCAN OPERATION
KEYSCAN INITIALIZATION
Figure 4. Keyscan Initialization
KEYSCAN INITIALIZATION EXAMPLE
Table 4 shows all the LM8330 register configurations to initialize keyscan:
•
Keypad matrix configuration is 8 rows x 8 columns.
Table 4. Keyscan Initialization Example
Register name
adress
Access Type
Value
Comment
KBDSETTLE
0x01
byte
0x80
Set the keyscan settle time to 12 msec.
KBDBOUNCE
0x02
byte
0x80
Set the keyscan debounce time to 12 msec.
KBDSIZE
0x03
byte
0x88
Set the keyscan matrix size to 8 rows x 8 columns.
KBDDEDCFG
0x04
word
0xFC3F
Configure KPX[7:2] and KPY[7:2] pins as keyboard matrix.
IOCFG
0xA7
byte
0xF8
Write default value to enable all pins as keyboard matrix.
IOPC0
0xAA
word
0xAAAA
Configure pullup resistors for KPX[7:0].
IOPC1
0xAC
word
0x5555
Configure pulldown resistors for KPY[7:0].
KBDIC
0x08
byte
0x03
clear any pending interrupts.
KBDMSK
0x09
byte
0x03
Enable keyboard interrupts.
CLKEN
0x8A
byte
0x01
Enable keyscan clock.
12
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: LM8330



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