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PDF AK9822 Data sheet ( Hoja de datos )
| Número de pieza | AK9822 | |
| Descripción | 2K / 4Kbit EEPROM with 2ch 8bit D/A Converter | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK9822 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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ASAHI KASEI
[AK9822/24]
AK9822 / 24
2K / 4Kbit EEPROM with 2ch 8bit D/A Converter
General Description
The AK9822/24 includes 2 channel, 8 bit D/A converters with on-chip output buffer amps and it is
capable to store the input digital data of each D/A converter by on-chip non-volatile CMOS
EEPROM. The AK9822/24 is optimally designed for various circuit adjustments for consumer and
industrial equipments and it is ideally suited for replacing mechanical trimmers.
Feature
EEPROM section
AK9822 • • • 128 words Õ 16bit
AK9824 • • • 256 words Õ 16bit
One chip microcomputer interface
Sequential register read
D/A Converter section
2 channel
Resolution : 8bit
Differential Non-Linearity
Linearity Error
Output Voltage Range
: 1.0 LSB
: 1.5 LSB
: GND ∼ VCC
Wide VCC operation
• EEPROM section
: 1.8V∼5.5V
• D/A Converter Section : 2.7V∼5.5V
Power Down Function
DAD01E-00
Block Diagram
-1-
1999/05
1 page  
ASAHI KASEI
[AK9822/24]
AUTO READ function
AUTO READ function automatically reads the content of EEPROM and sets the output of the D/A
converter of two channels, when Vcc is applied to the part.
When Vcc is applied to the part in CS="L", the AUTO READ function starts by falling CS pin first.
After the CS pin is made a low level, the output of AO0 and AO1 is set within 2ms. At this time, the
input pins (SK, DI) other than the CS pin are not accepted, and the serial data is not output from the
DO pin. If the WREN instruction is executed after the AUTO READ function finished, AK9822/24
becomes the WRITE enable state.
After Vcc is applied to the part, the AUTO READ function is executed only once.
AUTO READ function is executed when Vcc is applied to the part in CS="L".
(note) Because AK9822/24 always executes the AUTO READ function first after Vcc is applied to
the part, AK9822/24 is not able to accept the instruction for the first period of "L" of the CS.
Instruction and Composition of the data
Each instruction consist of op-code, address, and data (8bitÕ2) composed in each 8bit. The
composition of the WRITE instruction is shown as follows.
DAD01E-00
-5-
1999/05
5 Page 
ASAHI KASEI
Absolute Maximum Ratings
[AK9822/24]
Parameter
Power supply
Input voltage
Ambient temperature
Storage temperature
Symbol
VCC
VIO
Ta
TST
Conditions
Relative to GND
Relative to GND
Spec.
-0.6∼+7.0
-0.6∼VCC+0.6
-40∼+85
-65∼+150
Units
V
V
°C
°C
Parameter
Power supply
Analog output
source current1
Analog output
sink current1
Analog output
source current2
Analog output
sink current2
Analog output
load capacitance
Recommended Operating conditions
Symbol
VCC1
VCC2
IAL1
Conditions
DAC operation
EEPROM operation
IAH1 3.6V≤VCC ≤5.5V
IAL2
IAH2 2.7V≤VCC<3.6V
AOC
min typ max Units
2.7 5.5 V
1.8 5.5 V
1 mA
1 mA
500 uA
500 uA
1.0 uF
DAD01E-00
- 11 -
1999/05
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AK9822.PDF ] | |
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