ASAHI KASEI
[AK9813A]
Data Configuration
AK9813A have a shift register in order to control the chip.
When the SEL pin is "H"(CS I/F), the shift register becomes 16bit configuration and the data on the DI pin
should be loaded with LSB first. When the SEL pin is "L"(LD I/F), the shift register becomes 14bit
configuration and the data on the DI pin is loaded with MSB first.
The following description shows the configuration of the shift register.
The data set consist of 2-bits for the control of the internal EEPROM, 2-bits for the address of the EEPROM
(CS I/F only), 4-bits for select of D/A converter and 8-bits for the digital input data of the 8bit D/A converter and
total data set is 16bits or 14bits.
1
{
Shift register configuration : SEL=High(CS I/F)
OUTPUT VOLTAGE FOR D/A CONVERTER
D7 D6 D5 D4 D3 D2 D1 D0 OUTPUT VOLTAGE FOR D/A
0
0
0
0
0
0
0
0 = GND=VSS
0
0
0
0
0
0
0
1 = VDD/255
Õ
1
0
0
0
0
0
0
1
0 = VDD/255
Õ
2
•
•
•
•
•
•
A1 A0 EEPROM ADDRESS
0
1 ADDRESS : 0
0
1 ADDRESS : 1
1
0 ADDRESS : 2
1
1 ADDRESS : 3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
•
•
= VDD/255
Õ
254
= VDD
•
•
D/A CONVERTER CHANNEL SELECTION
D11 D10 D9 D8
D/A CHANNEL
0
0
0
0
Don't Care
0
0
0
1
AO1
0
0
1
0
AO2
0
0
1
1
AO3
0
1
0
0
AO4
0
1
0
1
AO5
0
1
1
0
AO6
0
1
1
1
AO7
D11
1
1
1
1
1
1
1
1
D10
0
0
0
0
1
1
1
1
D9 D8
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
D/A CHANNEL
AO8
AO9
AO10
AO11
AO12
Can't use
Can't use
Don't Care
(NOTE) Above "Don't care" state is valid only when AK9813A is in DAC mode or WRITE mode.
Refer to the following section "Instruction Set" about mode.
DAD03E-00
-5-
1999/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
