AK4186 Datasheet, PDF (19/33 Pages) Asahi Kasei Microsystems – Low Power Touch Screen Controller with I2C Interface

[AK4186]
2. Single Mode Data Register
The AK4186 starts A/D conversion in single mode by receiving a single measurement command, and then outputs MSB
first 12bit A/D data.
Addr
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
Register Name
Single XH
Single XL
Single YH
Single YL
Single Z1H
Single Z1L
Single Z2H
Single Z2L
Single INH
Single INL
D7
D6
D5
D4
D3
XS11
XS10
XS9
XS8
XS7
XS3
XS2
XS1
XS0
0
YS11
YS10
YS9
YS8
YS7
YS3
YS2
YS1
YS0
0
Z1S11
Z1S10
Z1S9
Z1S8
Z1S7
Z1S3
Z1S2
Z1S1
Z1S0
0
Z2S11
Z2S10
Z2S9
Z2S8
Z2S7
Z2S3
Z2S2
Z2S1
Z2S0
0
INS11
INS10
INS9
INS8
INS7
INS3
INS2
INS1
INS0
0
Table 12. Data Register for Single Mode (Read Only)
D2
XS6
0
YS6
0
Z1S6
0
Z2S6
0
INS6
0
D1
XS5
0
YS5
0
Z1S5
0
Z2S5
0
INS5
0
D0
XS4
0
YS4
0
Z1S4
0
Z2S4
0
INS4
0
■ Power-down Control
Power-down and pen interrupt function are controlled by PD0 bit. In order to achieve minimum current, it is
recommended to set PD0 bit = “0” for automatic power down of the touch screen driver after A/D conversion. It is
possible to reduce the variation in data by setting PD0 bit = “1” during measurements. A/D converter keeps power up
state after every measurement completed.
When the register data of address 01H is written, PD0 bit is updated at the rising edge of the 27th SCL. The last PD0 bit
is valid until this timing.
The A/D converter and internal oscillator are automatically powered up at the start of the conversion, and automatically
powered down at the end of the conversion, regardless of the PD0 bit setting.
PD0 PENIRQN
Function
0
Enable Auto Power-down Mode
In power-down state, the touch screen driver switches are powered down. (Only YN
or BL driver switch is turned ON and forced to VSS.) PEN interrupt function is
enabled except when in the sampling time and converting time.
1
Disable Driver ON Mode
If X-axis or Y-axis is selected as analog input, touch screen driver switches are
always powered up. This is effective when more settling time is required to suppress
the electrical bouncing of touch plate. PEN interrupt function is disabled and
PENIRQN is forced to “L” state.
Table 13. Power-down Control
MS1068-E-04
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2011/03