AK4185 AKM [Asahi Kasei Microsystems], AK4185 Datasheet - Page 20

• Manufacturer Part Number: AK4185
• Manufacturer: AKM [Asahi Kasei Microsystems]

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When the micro-processor sends the sequence start command (10101110b), the AK4185 starts the internal clock mode.
The AK4185 sets the PENIRQN pin to “L” and automatically powers up the internal oscillator. Then the AK4185
executes the sequence that selected by SEQM2-0 bits one by one. When the sequence is finished, the AK4185 sets the
PENIRQN pin to “H” and notifies that sequence is ended. After 2.8μs (typ.) is passed from the rising edge of the
PENIRQN pin, the internal oscillator is powered down and PEN interrupt function is enabled.
The micro-controller can confirm that the A/D conversion data is available by checking the PENIRQN pin or reading the
status register (SEQST1-0 bits). The micro-processor sends the read command (10101111b) to read the A/D conversion
data. Then the AK4185 outputs the A/D data in order of the register selected by SEQM1-0 bits. When the micro-processor
reads data as many as more than the actual data number, the AK4185 outputs a zero data. The A/D data is cleared after
reading all the A/D data.
Must read the A/D conversion data after confirming the PENIRQN pin turns to “H” or a register status SEQST1-0 =
“11”(Data Available). Do not read the A/D conversion data when the data is not available.
MS0954-E-00
Touch Screen Controller Control Sequence (Internal Clock Mode)
Figure 19. Internal Clock Mode Control Flowchart
Stop Clock & PenTouch Enable
No
Set PENIRQN High
Set PENIRQN Low
Sequence Start
Start Clock
Count End?
Wait Timer
Driver Set
Sequence
Touch
Done
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ADC
End?
Pen
Yes
Yes
No
[AK4185]
2008/05