AK4185 AKM [Asahi Kasei Microsystems], AK4185 Datasheet - Page 12

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

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The AK4185 operates with the microprocessor via SPI
with serial clock. The AK4185 operates off of supply voltage down to 1.6V in order to connect a low voltage
microprocessor.
Standard Sequence: 8bit Control Command
However Setup Command (write) writes Setup Function (4bit) after 8bit Control Command.
1. A/D Data Read
(1) External Clock Mode (Single Read)
(2) External Clock Mode (Continuous Read)
(3) Internal Clock Mode (Sequential Mode: X-Y-Z1-Z2)
MS0954-E-00
Digital I/F
DDLY bit = “0”
DDLY bit = “1”
DDLY bit = “0”
DIN
DOUT
D7
S
“0 1 0 1 1 1 1”
DIN
DOUT
DIN
DOUT
Command
Byte
D7
D7
4/5-wire touch panel
S
S
D0
Figure 10. Continuous Read (External Clock Mode: DDLY bit = “1”)
Figure 9. Continuous Read (External Clock Mode: DDLY bit = “0”)
0 0 0 0
Figure 11. Sequential Read (Internal Clock Mode: DDLY bit = “0”)
Command
Byte
Command
Byte
D11
* * In 8bit output mode, the A/D data is MSB justified.
* In 8bit output mode, the A/D data is LSB justified.
D0
D0
0 0 0 0
0
A/D Data (X)
DIN
DOUT
D11
Figure 8. Single Read (External Clock Mode)
D11
A/D Data (1)
A/D Data (1)
D0
D7
S
0 0 0 0
Command
Byte
Figure 7. Digital I/F
D0
0 0 0 0
D11
D0
TM
0 0 0 0
A/D Data (Y)
D11
AK4185
- 12 -
bus. The microprocessor starts to transmit data synchronized
D0
0
D11
D11
A/D Data (2)
A/D Data
(Left justified)
A/D Data (2)
D0
VDD=1.6V – 3.6V
0 0 0 0
D0
0 0 0
D11
PENIRQN
CSN
SCLK
DIN
DOUT
D0
A/D Data (Z1)
D0
0
D11
0 0 0 0
A/D Data (n)
D11
D0
0 0 0 0
A/D Data (n)
Processor
D0
Micro-
D11
0 0 0
A/D Data (Z2)
D0
D0
[AK4185]
2008/05