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AR1010-I/ML 데이터시트(PDF) 47 Page - Microchip Technology

부품명 AR1010-I/ML
상세설명  Resistive Touch Screen Controller
PDF  70 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

AR1010-I/ML 데이터시트(HTML) 47 Page - Microchip Technology

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 2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 47
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
10.2
AR1011/AR1021 Storing Default
Calibration Values to EEPROM
If you wish to implement fixed calibration values,
pre-loaded into the AR1000 EEPROM, then the
following
procedure
must
be
followed
(See
Section 10.2.1 “Preparation for Fixed Calibration
Values”).
10.2.1
PREPARATION FOR FIXED
CALIBRATION VALUES
Determine if fixed calibration values are suitable for
your application and determine your desired values.
Calculate a checksum for your custom data set. See
Section 9.3.4.3 “Calibration Data Encoded and
Stored in EEPROM” for additional details regarding
calibration data format.
An example of calculating the checksum is shown
below (See Table 10-1).
The Checksum is an 8-bit value calculated by
successive additions with overflow ignored, as shown
below.
Checksum = 0x45
For each of the 18 calibration values, starting at the
Block Key and ending with the Flip State
Checksum += Calibration value
Next Calibration value
TABLE 10-1:
CHECKSUM CALCULATION EXAMPLE
Description
Value
Operation
Checksum Result
Seed
0x45
n/a
0x45
Block Key
0x55
0x45 + 0x55 =
0x9A
Upper Left
X
Low byte
0x06
0x9A + 0x06 =
0xA0
Upper Left
X
High byte
0x1B
0xA0 + 0x1B =
0xBB
Upper Left
Y
Low byte
0xA5
0xBB + 0xA5 =
0x60
Upper Left
Y
High byte
0x08
0x60 + 0x08 =
0x68
Upper Right
X
Low byte
0x13
0x68 + 0x13 =
0x7B
Upper Right
X
High byte
0xDF
0x7B + 0xDF =
0x5A
Upper Right
Y
Low byte
0xF4
0x5A + 0xF4 =
0x4E
Upper Right
Y
High byte
0x0B
0x4E + 0x0B =
0x59
Lower Right
X
Low byte
0x98
0x59 + 0x98 =
0xF1
Lower Right
X
High byte
0xE4
0xF1 + 0xE4 =
0xD5
Lower Right
Y
Low byte
0x1E
0xD5 + 0x1E =
0xF3
Lower Right
Y
High byte
0xEC
0xF3 + 0xEC =
0xDF
Lower Left
X
Low byte
0xBF
0xDF + 0xBF =
0x9E
Lower Left
X
High byte
0x1A
0x9E + 0x1A =
0xB8
Lower Left
Y
Low byte
0x32
0xB8 + 0x32 =
0xEA
Lower Left
Y
High byte
0xE7
0xEA + 0xE7 =
0xD1
Flip State
0x01
0xD1 + 0x01 =
0xD2
Checksum
0xD2



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