AK4650 Datasheet, PDF (57/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
3-3. XYZ Measurement Mode
When ADMODE1-0 bits are set to “10” and PM12AD bit is “1”, the AK4650 measures X-position at first, Y-position at
second, the item set by A2-0 and SER bits at third, and reports X-position to 74H, Y-position to 76H, third result to 78H,
respectively. 74H, 76H and 78H registers are cleared by PM12AD bit = “0”.
(1) 70H(ADFLT, DLY3-0, MSR1-0, ADEXE1-0) is set. Measurement mode should be set by A2-0 and SER bits, and
ADMODE1-0 bits should be set to “10” at the same time. 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 Y-position measurement and the wait time set by DLY3-0 bits, the AK4650 measures the item set by A2-0 and
SER bits, and reports the result to 78H. When ADFLT bit is “1”, averaged data of four measurement results is
reported to 78H.
(5) After the measurement, ADMODE1-0 bits are automatically reset to “00”.
(6) 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
78 H :A D E b it
7 8 H :D 1 1 -D 0 b its
11
10
X M easure
DELAY
XXX
XXX
XXX
X M easure
Y M easure
DELAY
y M easure
X -P o s itio n
Z1 M easure
DELAY
Z1 M easure
Y -P o s itio n
00
P E N -W a it
Z 1 -P o s itio n
DLY3-0 bits = “1H” (2TS)
Figure 44. X, Y and Z position measurement sequence (ADFLT bit = “1”, A2-0 bits = “011”, SER bit = “0”)
When ADMODE1-0 bit is set to “10” again, then the AK4650 set ADE bit as “0” and measurement is executed again.
MS0502-E-01
- 57 -
2007/04