AK4186 AKM [Asahi Kasei Microsystems], AK4186 Datasheet - Page 19

• Manufacturer Part Number: AK4186
• Description: Low Power Touch Screen Controller with I2C Interface
• Manufacturer: AKM [Asahi Kasei Microsystems]

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.
■
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.
MS1068-E-04
Addr
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
PD0
Power-down Control
0
1
Single XH
Single XL
Single YH
Single YL
Single Z1H
Single Z1L
Single Z2H
Single Z2L
Single INH
Single INL
PENIRQN
Disable
Enable
Register Name
Auto Power-down Mode
Driver ON 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.
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 12. Data Register for Single Mode (Read Only)
Z1S11
Z2S11
INS11
XS11
YS11
Z1S3
Z2S3
INS3
XS3
YS3
D7
Table 13. Power-down Control
Z1S10
Z2S10
INS10
XS10
YS10
Z1S2
Z2S2
INS2
XS2
YS2
D6
- 19 -
Z1S9
Z2S9
Z1S1
Z2S1
INS9
INS1
XS9
XS1
YS9
YS1
D5
Function
Z1S8
Z1S0
Z2S8
Z2S0
INS8
INS0
XS8
XS0
YS8
YS0
D4
Z1S7
Z2S7
INS7
XS7
YS7
D3
0
0
0
0
0
Z1S6
Z2S6
INS6
XS6
YS6
D2
0
0
0
0
0
Z1S5
Z2S5
INS5
XS5
YS5
D1
0
0
0
0
0
[AK4186]
2011/03
Z1S4
Z2S4
INS4
XS4
YS4
D0
0
0
0
0
0