AK4183_08 Datasheet, PDF (14/18 Pages) Asahi Kasei Microsystems – I2C Touch Screen Controller

[AK4183]
■ READ Operation Sequence (Figure 14)
A/D conversion is synchronized with SCL. Sampling time is the one SCL clock period (SCL7↓∼ SCL8↓) on the end of
writing address byte and then hold. A/D conversion is held on the next 12 SCL period (except MASTER ACK) .The
readout sequence is that after command byte has been sent, AK4183 respond with acknowledge if the address matches.
The MSB data byte will follow (D11∼D4) then issued acknowledge by master. The LSB data byte (D3∼D0, followed
four “0”) will be followed by NOT acknowledge bit (NACK) from master in order to terminate the read transfer. The
master will then issued STOP that ends read operation or Repeated Start condition that keeps write or read operation.
The master will issue Repeated Start Condition or START condition followed by read operation again. AK4183 repeats
A/D data updated [continuous read operation]. Master must issue STOP condition after terminating the last read out of
A/D data.
SCL
SDA
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
R/ W
100
1
0
0 ^CAD0 1
0 ^{D11 D10 D9}
D8 D7 D6 D5 D4
0 D3 D2 D1
D0
0
0
0
0
1
START
Address Byte
AK4183
ACK
Data Byte (MSB)
MASTER
ACK
Data Byte (LSB)
MASTER
NACK _{STOP or}
Repeated START
Touch Driver SW
A2=“0” or A2=“1” , PD0=“1”
Sampling
“H”
AD conversion
A2=“0”, PD0=“0”
A2=“1”, PD0=“0”
IV
V
VI
Figure 14 Read data Sequence
MS0500-E-01
14
2008/12