AK4650 Datasheet, PDF (59/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
4-2. X-Y Measurement Mode
When PM12AD bit is “1” and then ADMODE1-0 bits are set to “01”, the AK4650 measures X-position as many times as
set by MSR1-0 bits at first, Y-position as many times as set by MSR1-0 bits at second, regardless of A2-0 and SER bits.
Measurement results are output via slot after wait time set by DLY3-0 bits.
(1) When SLOT bit = “1”, pen touch waiting state (PM12AD bit = “0” and PINTE bit = “1”) should be set.
(2) When the controller receives PEN Interrupt, the controller should set PM12AD bit = “1”. Then data is output via slot.
12bit ADC is powered-up by setting PM12AD bit = “1”. ADMODE1-0 bits should be set to “01” at the same time.
(3) After the wait time set by DLY3-0 bits, the AK4650 measures X-position as many times as set by MSR1-0 bits and
outputs the result via slot.
(4) After X-position measurement and the wait time set by DLY3-0 bits, the AK4650 measures Y-position as many times
as set by MSR1-0 bits and outputs the result via slot.
(5) After Y-position measurement, 12bit ADC is powered-down and the AK4650 waits for pen touch.
SYNC
S lo t b it
PM 12AD,
P IN T E b its
00
A D M O D E 1 -0 b its
00
ADC Mode
1 2 b it A D C
P E N -W a it
S lo t B IT 1 9
S lo t B IT 1 8 -1 6
000
S lo t B IT 1 5-4
0
10
01
X M easure
Y M easure
D E L A Y X M easure X M easure X M easure X M easure
D E L A Y y M easure y M easure y M easure y M easure P E N -W a it
101
000
001
X pos
X Pos
X pos
X pos
0
y pos
y pos
y pos
DLY3-0 bits = “0H” (1TS), MSR1-0 bits = “0H” (4 times)
Figure 45. X and Y position measurement sequence
y pos
000
0
MSR1-0 bit
Measurement times
00
4 times
(default)
01
8 times
10
16 times
11
32 times
Table 52. Measurement times (SLOT bit = “1”)
MS0502-E-01
- 59 -
2007/04