ak4181a AKM Semiconductor, Inc., ak4181a Datasheet - Page 14

• Manufacturer Part Number: ak4181a
• Description: Touch Screen Controller
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
AXIS = ((!A2) & (!A1) & (A0))
EN1 = ((!CSN) & (!CONV) & AXIS & PD0)
EN2 = ((!CSN) & (!CONV) & (!PD0))
before sending first control command. On this condition pen interrupt function may be disable, internal reference may also be ON
state ([PD1, PD0] = [1,1]). 8bit control command must be sent as quick as possible when first power up to fix the internal register
value. The sequence is that 1) Power On with CSN = “L” or “H” then CSN = “H”. 2) Send control command after CSN = “L”. 3)
CSN = “H” again. Once sending command to fix the internal register after first power up, the state of AK4181A is held on the
condition of state as last command issued.
MS0313-E-00
On the AK4181A first powers up, the register value including power down mode, internal reference (PD1, PD0) holds unfixed
Power on Sequence
Internal
CONV
CSN
DOUT
DCLK
BUSY
DIN
| ((!A2) & (A1) & (A0))
| ((A2) & (!A1) & (!A0))
| ((A2) & (!A1) & (A0));
| ((!CSN) & AXIS & CONV);
| (CSN & (!(PD1& PD0));
EN1
/* CSN=”L”, X/Y/Z1/Z2 Measurement, PD0 = 1, NOT “CONV period” */
/* CSN=”L”, X/Y/Z1/Z2 Measurement, “CONV period” */
/* CSN=”L”, PD0 = 1, NOT “CONV period” */
/* CSN=”H”, (PD0, PD1) is not (1,1) */
S
1
A2
2
A1
3
A0
4
/* X-axis Measurement */
/* Z1 Measurement */
/* Z2 Measurement */
/* Y-axis Measurement */
MO
Figure 7 PENIRQ Functional Block Diagram
5
SER/
DFR
50kΩ
6
PD1
7
PD0
8
9
11
EN2
10
10
11
14
Driver OFF
Driver ON
9
12
8
13
7
14
6
15
5
16
4
17
3
18
2
XP
YN
19
PENIRQN
1
20
0
100kΩ
21
22
23
24
[AK4181A]
2004/06