AK4185 AKM [Asahi Kasei Microsystems], AK4185 Datasheet - Page 18

• Manufacturer Part Number: AK4185
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
(1) Single Mode (CONTINUE bit = “0”)
The timing of sampling and A/D conversion is shown in
serial interface (CSN, SCLK, DIN, and DOUT pins). The DOUT pin changes to “L” from Hi-Z state at the falling edge of
CSN. The AK4185 latches the 8bit control word serially via the DIN pin at the rising edge of SCLK. The DIN pin must
keep low state for minimum 7SCLK times (9th-15th SCLK) after command is sent on the DIN pin. As the AK4185 starts
the command decoding at the first “H” bit after CSN = “↓”, MSB (S bit) of the command must be “H”. Tracking time is
the period from the falling edge of 5th SCLK to the falling edge of 8th SCLK. The SAR A/D conversion is synchronized
with SCLK. The AK4185 outputs 12bit or 8bit A/D data with MSB first via the DOUT pin from the falling edge of 9th
SCLK. The AK4185 can output one A/D data per 15 SCLK clock cycles for the fastest way as shown in the dotted line.
Please see
MS0954-E-00
Touch Screen Driver SW (Internal Node)
(DFR Mode, PD0 =”0”)
Touch Screen Driver SW (Internal Node)
(DFR Mode, PD0 =”0”)
Touch Screen Controller Control Sequence (External Clock Mode)
DOUT
SCLK
DOUT
SCLK
CSN
CSN
DIN
DIN
“Switching
Hi-Z
Hi-Z
S
S
1
1
A2
A2
Characteristics” for the detail.
2
2
Figure 15. External Clock Mode Control Sequence (Single12bit Mode)
Figure 16. External Clock Mode Control Sequence (Single 8bit Mode)
A1
A1
3
3
A0
A0
4
4
MO
MO
5
5
X1
X1
6
6
X2
X2
7
7
0
PD0
CONTROL SEQUENCE
8
8
9
9
11
7
10
10
10
Figure 15
6
11
11
- 18 -
9
5
12
12
8
4
13
13
and
7
3
14
14
Figure
2
6
15
15
5
16
S
1
S
16
16. The AK4185 is controlled via 4-wire
A2
4
A2
0
17
17
A1
3
A1
18
18
2
A0
A0
19
19
MO
MO
1
20
20
X1
0
X1
21
21
X2
X2
22
22
PD0
PD0
23
23
24
24
7
11
[AK4185]
6
2008/05
10