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LM8300HMT9 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM8300HMT9 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 20 page 9.0 Functional Description (Continued) Byte #11: Number of calibration coordinates (0, 2, 5 or 13) Byte #12: Toggle-flags: Bit #5: calibration coordinates check (0=disabled, 1=enabled) Bit #4: Pressure measurement (0=disabled, 1=enabled) Bit #3: Echo mode (0=disabled, 1=enabled) Bit #2: Self Power-Down mode (0=disabled, 1=enabled) Bit #1: Unused Bit #0: External filter path (0=disabled, 1=enabled) Byte #13: Pressure threshold for valid touch This command allows the user to read all the selected pa- rameters. It is primary intended to aid in debugging. This command can also be used if a configuration utility needs to determine the current setting of controller. $B2: Read software version number Reply Byte #1: $C7 (Software version number) Byte #2: First byte in version number, year 20 (00-99) Byte #3: Second byte in version number, month (1-12) Byte #4: Third byte in version number, day (1-31) $B3: Read # of calibration points Reply Byte #1: $CA (Acknowledge) Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points) $B4: Read stored calibration points Reply Byte #1: $CA (Acknowledge) Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points) Byte #3: X-max (2 MSB for coordinate 1) Byte #4: X-min (8 LSB for coordinate 1) Byte #5: Y-max (2 MSB for coordinate 1) Byte #6: Y-min (8 LSB for coordinate 1) Continue until all coordinates have been sent. A zero is send back if calibration has not been performed and there are no data bytes. $B8: Set focus value Byte #2: Focus value (0-63) Reply Byte #1: $CA (Acknowledge) Byte #2: Focus value (0-63) The set focus command allows the setting of different values to improve touch screen focusing. Focusing is defined as the ability of the touch screen controller to detect exactly identi- cal coordinate values from measurement to measurement if the pointer on the touch screen has not moved. The focus values are equivalent to pixels of touch screen resolution. If for example a value of 2 is selected, this means that every coordinate value that is within two pixels of the previously measured coordinate value is considered to be identical to that previous value and that in this case the touch screen controller transmits the previous coordinate information. This keeps the mouse pointer steady at the point being touched, rather than "jumping around" the point. A Focus value of zero disables the focusing algorithm. The default setting is 4. $BA: Set number of samples per coordinate Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04 - 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32 samples/coordinate) Reply Byte #1: $CA (Acknowledge) Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04 - 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32 samples/coordinate) This command allows the selection of different sample num- bers per X, Y, and Z coordinates. The higher the number of samples per X, Y, and Z coordinates, the better the accuracy, but the lower the coordinates per second data rate. The default setting is 8. $BB: Set communication mode Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff) Reply Byte #1: $CA (Acknowledge) Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff) See the communication modes section for a description of the stream, touchdown and liftoff modes. This command selects the communication mode. The default setting is stream mode. $BC: Set max delta Byte #2: Max delta value (0-63) Reply Byte #1: $CA (Acknowledge) Byte #2: Max delta value (0-63) See the averaging algorithms section for a detailed descrip- tion of this setting. Simply put, this command sets how much the "coordinate velocity" can change from one coordinate to the next. The default setting is 8. $BD: Set calibration points Byte #2: High nibble: Number of calibration points ($01 = two, $02 = five, $04 = thirteen) Low nibble: Active calibration cross (1-13 = cross #) Reply Byte #1: $CA (Acknowledge) Byte #2: High nibble: Number of calibration points ($01=two, $02=five, $04=thirtheen) Low nibble: Active calibration cross # (1-13) Refer to the calibration section for details. $BE: Set minimum pressure Byte #2: Minimum pressure value (0-127) Reply Byte #1: $CA (Acknowledge) Byte #2: Minimum pressure value (0-127) This setting controls how high the pressure (Z-axis) must be in order for samples to be accepted. Setting this value too low may result in having faulty coordinates accepted. This value is internally multiplied by two in the controller (due to the 7-bit limitation in the communication format, which can not send 8-bit values larger than 127 in one byte). The default setting is 40. $A0: Toggle disable/enable external filter path Reply Byte #1: $CA (Acknowledge) Byte #2: (0 = now disabled, 1 = now enabled) This command enable/disable external filter path. The exter- nal filter path enabled option will require the addition of a single external low pass filter (either R/C or active OpAmp based), which is then applied to the touch screen signal www.national.com 11 |
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