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XPT7603 Datasheet(PDF) 19 Page - List of Unclassifed Manufacturers

Part No. XPT7603
Description  4-wire resistive touch screen controller
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Maker  ETC2 [List of Unclassifed Manufacturers]
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 19 page
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internal ADC circuit to start work, until the ADC data conversion is completed, the
chip automatically enter the power down state, ADC internal registers of the data,
the wait to read
Internal reference source at the closed
0
1
Disable
ADC always
Internal reference source at the closed
1
0
Enable
And "00" state of the difference is that this configuration of the internal reference
source is turned on
1
1
Disable
The internal ADC and reference sources are always in the state, at this time as
long as the chip is power-state-driven switch in line to open
M - Mode Selection, and to set the resolution of ADC. MODE = 0, ADC is a 12-bit mode; MODE =
1, ADC is an 8-bit mode.
The lowest bit (bit0) is set aside, and can be set up, the general set to 0
In the second byte received after all, XPT7603 in the first 18 clock cycles, the issue of response
signal ACK (0-level), indicating that the data has been received.
9.2
Read Command
Order Timing
Shown in Figure 7ļ¼š
Figure 7 I2C Interface Read Command Timing Schamatic
Reading at 3-byte command, the first address byte for byte, and the write command is similar only for the
high bit0; the next 2 bytes is the 12bit output XPT7603 data (8bits mode if it is only 1 bytes of data),
redundant 4bits zero.
XPT7603 received in the first byte of the address data, 9 in the first clock cycle to issue response signal
ACK (0-level), and then started to output the first byte of data received in the host after the first byte of data
response signal should be issued master ACK (0-level), XPT7603 receive masker ACK sent after the second
byte of data received in the host after the second byte of data, do not answer at this time to pull SDA was
high , which is shown on the masker Not ACK signal.




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