AK4650 Datasheet, PDF (56/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
3-1-2.ADFLT bit = “1” : Averaging of four data
(1) 70H (ADFLT, DLY3-0 and ADEXE1-0) is set. A2-0 and SER bits set the measurement mode at the same time, and
12bit ADC is powered-up by setting PM12AD bit = “1”.
(2) After the wait time set by DLY3-0 bits, the measurement is executed for four times and the averaged result is reported
to 74H.
(3) When 74H is read, the data of 74H is output.
SYNC
PM 12AD,
P IN T E b its
A 2 -0, S E R ,b it
11
1010
0010
Read Com m and
74h
74h
S end A D C D ata
ADC Mode
X M easure
Y M easure
1 2 b it A D C
DELAY
X -M easure
W a it
DELAY
Y -M easure
W a it
A D E bit
D 1 1 -D 0 b its
XXX
X -Pos
Y -P o s
DLY3-0 bits = “1H” (2TS)
Figure 42. X and Y position measurement sequence (ADFLT bit = “1”)
3-2. X-Y Measurement Mode
When ADMODE1-0 bits are set to “01” and PM12AD bit is “1”, the AK4650 measures X-position at first, Y-position at
second, and reports X-position to 74H, Y-position to 76H, respectively, regardless of A2-0 and SER bits. 74H and 76H
registers are cleared by PM12AD bit = “0”.
(1) 70H(ADFLT, DLY3-0, MSR1-0, ADEXE1-0) is set. ADMODE1-0 bits should be set to “01” at the same time, and
12bit ADC is powered-up by setting PM12AD bit = “1”.
(2) After the wait time set by DLY3-0 bits, the AK4650 measures X-position and reports the result to 74H. When
ADFLT bit is “1”, averaged data of four measurement results is reported to 74H.
(3) After X-position measurement and the wait time set by DLY3-0 bits, the AK4650 measures Y-position and reports
the result to 76H. When ADFLT bit is “1”, averaged data of four measurement results is reported to 76H.
(4) After the measurement, ADMODE1-0 bits are automatically reset to “00”.
(5) When PINTE bit = “1”, 12bit ADC is powered-down and the AK4650 waits for pen touch.
SYNC
PM 12AD,
P IN T E b its
A D M O D E 1 -0 b its
ADC Mode
1 2 b it A D C
7 4H :A D E b it
7 4 H :D 1 1 -D 0 b its
76 H :A D E b it
7 6 H :D 1 1 -D 0 b its
10
01
X M easure
DELAY
XXX
XXX
Y M easure
X M easure
DELAY
X -P o s itio n
00
y M easure
P E N -W a it
DLY3-0 bits = “2H” (4TS)
Figure 43. X and Y position measurement sequence
Y -P o s itio n
When ADMODE1-0 bit is set to “01” again, then the AK4650 set ADE bit as “0” and measurement is executed again.
MS0502-E-01
- 56 -
2007/04