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參數(shù)資料
| 型號： | LM8500IMT9/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 327K |
| 代理商： | LM8500IMT9/NOPB |
14.0 Calibration (Continued)
Calibration, and Table 5. Thirteen Points Calibration respec-
tively.
TABLE 3. Two Points Calibration
Calibration point Theoretical X-value Theoretical Y-value
1
127
2
895
TABLE 4. Five Points Calibration
Calibration point Theoretical X-value Theoretical Y-value
1
127
2
895
3
127
895
4
511
5
895
127
TABLE 5. Thirteen Points Calibration
Calibration point Theoretical X-value Theoretical Y-value
1
127
2
895
3
127
895
4
511
5
895
127
6
895
511
7
511
895
8
127
511
9
511
127
10
623
319
11
623
12
319
623
13
319
14.1 GENERAL CALIBRATION PROCEDURES
Calibration is invoked by sending a command byte of $BD
followed by a command byte to the device. The command
byte is broken into two parts: the high nibble states the
number of calibration points to performs and the lower nibble
states the active calibration point. For example, to do the first
calibration point for the two point calibration, the command
bytes of $BD and $11 are sent to the device. The device then
echos $BD and $11 back to the TS driver and waits for a
touch on the panel. When a touch is detected, the device
checks to see if the point is within the specified parameters
if the calibration point checking is enabled. If the calibration
point checking is disabled, the device will send a $C8 for OK
byte to the TS driver regardless of where the touch was
detected. This calibration point checking can be enabled or
disabled by sending a command byte of $A5 to the device.
When all the calibration points are done, the device will do a
self-test and send a command of $CB for OK or a command
of $CC for failed. If a $CC is received, the TS driver should
issue a warning stating the calibration was not done properly
and redo the calibration procedures. The flowchart for the
calibration procedures is shown in Figure 8.
20037207
FIGURE 5. Two Points Calibration Mapping
20037208
FIGURE 6. Five Points Calibration Mapping
20037209
FIGURE 7. Thirteen Points Calibration Mapping
LM8300/LM8500
www.national.com
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