
[AK4650]
MS0502-E-01
2007/04
- 53 -
■
12bit ADC Data Reception Method
1. Selection of data reception method
The AK4650 supports the following two method for 12bit ADC data reception which is selected by SLOT bit.
SLOT bit
12bit ADC data reception method
0
“Register”
The AK4650 reports the measurement result (12bit ADC data) to the control register, then
controller gets the data by reading the register of 74H, 76H and 78H.
1
“Slot”
The AK4650 reports the measurement result (12bit ADC data) to slot 5, slot 6 or slot 12,
then controller gets the data from the asigned slot.
Table 44. 12bit ADC data reception method
2. Measurement Mode Setting
A2-0 and SER bits set the measurement mode (Table 45). PM12AD and PMVREF bits control the 12bit ADC
power-up/down.
DLY3-0 bits set the wait time from mode setting to measurement (Table 47). ADFLT bit sets the averaging of four data or
not (Table 48). If these modes are changed during wait time, 12bit ADC is reset and starts with latest mode setting.
A2-0,
SER bit
Driver switch status
(default)
ADC Input
(
Δ
AIN)
AIN+
XP
VBAT
XP(Z1)
YN(Z2)
YP
IN1
XP
XP(Z1)
YN(Z2)
YP
IN2
Reference voltage
(
Δ
VREF)
VREF+
VREF
VREF
VREF
VREF
VREF
VREF
YP
YP
YP
XP
VREF
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SER
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
XP
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
XN
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
ON
ON
ON
OFF
YP
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
OFF
YN
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
AIN
VREF
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
GND
Measurement item
N/A (default)
Y-axis
Battery voltage
Pen pressure (Z
1
)
Pen pressure (Z
2
)
X-axis
IN1 input
N/A
N/A
Y-axis
N/A
Pen pressure (Z
1
)
Pen pressure (Z
2
)
X-axis
IN2 input
N/A
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
GND
Table 45. 12bit ADC measurement mode