AK9813B Datasheet, PDF (5/24 Pages) Asahi Kasei Microsystems – 12ch 8bit D/A Converter with EEPROM

ASAHI KASEI
[AK9813B]
Data Configuration
AK9813B 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)
MSB
LSB
Last
First
A1 A0 CL WR D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
EEPROM EEPROM
ADDRESS CONTROL
SELECTION FOR
D/A CONVERTER
DIGITAL INPUT DATA
FOR D/A CONVERTER
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 x 1
0 0 0 0 0 0 1 0 ≒ VDD/255 x 2
1 1 1 1 1 1 1 0 ≒ VDD/255 x 254
1 1 1 1 1 1 1 1 ≒ VDD
A1 A0 EEPROM ADDRESS
00
01
10
11
ADDRESS: 0
ADDRESS: 1
ADDRESS: 2
ADDRESS: 3
D/A CONVERTER CHANNEL SELECTION
D11 D10 D9 D8 D/A CHANNEL
0000
Don't Care
0001
AO1
0010
AO2
0011
AO3
0100
AO4
0101
AO5
0110
AO6
0111
AO7
D11 D10 D9 D8 D/A CHANNEL
1 0 0 0 AO8
1 0 0 1 AO9
1 0 1 0 AO10
1 0 1 1 AO11
1 1 0 0 AO12
1 1 0 1 Can't use
1 1 1 0 Can't use
1 1 1 1 Don't Care
(NOTE) Above "Don't Care" state is valid only when AK9813B is in DAC mode or WRITE mode.
Refer to the following section "Instruction Set" about mode.
DAD04E-01
-5-
2002/11