AK4650 Datasheet, PDF (53/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
■ 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
0
1
12bit ADC data reception method
“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.
“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
(default)
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
A2 A1
00
00
01
01
10
10
11
11
00
00
01
01
10
10
11
11
A0 SER
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
Driver switch status
XP XN YP YN
OFF OFF OFF OFF
OFF OFF ON ON
OFF OFF OFF OFF
OFF ON ON OFF
OFF ON ON OFF
ON ON OFF OFF
OFF OFF OFF OFF
ADC Input
(ΔAIN)
AIN+ AIN−
XP
VBAT
XP(Z1)
YN(Z2)
YP
IN1
GND
GND
GND
GND
GND
GND
Reference voltage
(ΔVREF)
VREF+ VREF−
VREF
VREF
VREF
VREF
VREF
VREF
GND
GND
GND
GND
GND
GND
OFF OFF ON ON XP
YN
YP
OFF ON ON OFF XP(Z1) XN
OFF ON ON OFF YN(Z2) XN
ON ON OFF OFF YP
XN
OFF OFF OFF OFF IN2 GND
YP
YP
XP
VREF
Table 45. 12bit ADC measurement mode
YN
XN
XN
XN
GND
Measurement item
N/A (default)
Y-axis
Battery voltage
Pen pressure (Z₁)
Pen pressure (Z₂)
X-axis
IN1 input
N/A
N/A
Y-axis
N/A
Pen pressure (Z₁)
Pen pressure (Z₂)
X-axis
IN2 input
N/A
MS0502-E-01
- 53 -
2007/04