AK4186 Datasheet, PDF (20/33 Pages) Asahi Kasei Microsystems – Low Power Touch Screen Controller with I2C Interface

[AK4186]
■ Sleep Mode
The AK4186 supports sleep mode that puts touch panel to open state and disables pen interrupt function, effective for
reducing power consumption caused by unnecessary pen touch.
Sleep mode is controlled by SLEEP1-0 bits. The AK4186 changes to sleep mode on the rising edge of 27th SCL after
the micro-controller writes “01” or “10” to SLEEP1-0 bits of AK4186’s register. All touch screen driver switches and
A/D converter are powered down in this sleep mode, and it reduces power consumption to the minimum value. The
PENIRQN output is shown below. (Table 14)
The AK4186 returns to normal operation out of sleep mode when the micro-controller writes “00” to SLEEP1-0 bits.
The timing of going back to normal operation mode is the rising edge of the 27th SCL. The initial state after system
reset is in normal operation mode.
SLEEP1-0
00
01
10
11
PENIRQN
Touch Panel
Normal Operation
Normal Operation
Disable (PENIRQN=H)
Open
Disable (PENIRQN=Hi-z)
Open
N/A
N/A
Table 14. Sleep Mode
A/D conversion is available during sleep mode by issuing an ADC executing command (sequential). The AK4186
returns to sleep mode after completing an A/D conversion.
MS1068-E-04
- 20 -
2011/03