AK9822M

AK9822M Datasheet

[AK9822]

Part	Datasheet
AK9822M	AK9822M (pdf)

PDF Datasheet Preview
ASAHI KASEI [AK9822] AK9822 2Kbit EEPROM with 2ch 8bit D/A Converter General Description The AK9822 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 is optimally designed for various circuit adjustments for consumer and industrial equipments and it is ideally suited for replacing mechanical trimmers. EEPROM section 128 wordsx16bit One chip microcomputer interface Sequential register read D/A Converter section 2 channel Resolution 8bit Differential Non-Linearity Error Output Voltage Range LSB GND VCC Wide VCC operation section Converter Section Power Down Function SK CS Control Logic Instruction Register Data Register Latch Decorder 8bit 8bit Latch DAD01E-01 EEPROM 128x16 8bit 8bit Latch Block Diagram 2012/09 ASAHI KASEI • Ordering Guide AK9822M 8pin SSOP [AK9822] • Pin Layout 8pin SSOP（Pin • Pin Description Pin Name I/O Analog Output Pin I Chip Select Pin Function Schmitt-trigger input I Serial Clock Pin Schmitt-trigger input O Serial Data Output Pin Ground Pin I Serial Data Input Pin Power Supply O Analog Output Pin DAD01E-01 2012/09 ASAHI KASEI [AK9822] Functional Description The AK9822 is composed of EEPROM and the 8bit D/A converter of two channels with the output buffer amplifier. The AK9822 can connect to the serial communication port of popular one chip microcomputer directly 3 line negative clock synchronous interface . The AK9822 takes the data of the DI pin by the rising edge of the SK pin and outputs the data from the DO pin by the falling edge of the SK pin. The AK9822 has 7 instructions such as READ, WRITE, WREN, WRDS, PDEN, PDDS and CALL. The AK9822 is operated by inputting these instructions from the serial interface. Each instruction is organized by op-code block 8bits , address block 8bits and data 8bitsx2 . The DO pin is "Hi-Z" state except that the DO pin outputs the data of the internal register and the status of Ready/Busy. • WRITE protection function There are two states such as the WRITE enable state and the WRITE disable state in the AK9822. In the WRITE disable state the WRITE instruction becomes invalid and is not executed. When Vcc is applied to the part, the part powers up in the WRITE disable state and the part becomes the WRITE enable state by inputting the WREN instruction. The WRITE enable state continues until the WRDS instruction is executed or Vcc is removed from the part. Execution of a READ instruction is independent of both WREN and WRDS instructions. • Power down function There are two modes such as the power down mode and the normal mode in the AK9822. When the AK9822 is in the power down mode, the D/A converter section is in the standby state. At this time, the outputs of the D/A converters become "Hi-Z". When Vcc is applied to the part, the AK9822 is in the power down mode. When a AUTO READ function is executed, the part becomes the normal mode. After the AUTO READ function is executed, the mode of the part can be switched by the PDEN and PDDS instructions. The AK9822 becomes the power down mode by inputting the PDEN instruction. The part is in the power down mode until the PDDS instruction is executed. When the PDDS instruction is executed, the part becomes the normal mode. When returning to the normal mode from the power down mode, the D/A converters output the voltage value set before entering the power down mode. The relation between the D/A converter state and the mode are shown in the table Mode State of D/A converter Power down mode standby Normal mode normal Table The relation between the state of D/A converter and the mode DAD01E-01 2012/09 ASAHI KASEI [AK9822] • Output of D/A converter The output of the D/A converters can be set by the WRITE and the CALL instructions. Upper 8bit data of the first address of the internal EEPROM the address "0" corresponds to "AO" of the D/A converter output. Lower 8bit data of the address "0" corresponds to "A1". The internal composition of EEPROM is shown in the table2.

PDF Datasheet Preview

ASAHI KASEI
[AK9822]

AK9822
2Kbit EEPROM with 2ch 8bit D/A Converter

General Description The AK9822 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 is optimally designed for various circuit adjustments for consumer and industrial equipments and it is ideally suited for replacing mechanical trimmers.

EEPROM section 128 wordsx16bit One chip microcomputer interface Sequential register read

D/A Converter section 2 channel Resolution 8bit Differential Non-Linearity Error Output Voltage Range

LSB GND VCC

Wide VCC operation section Converter Section

Power Down Function

SK CS

Control Logic

Instruction

Register

Data

Register

Latch Decorder
8bit
8bit

Latch

DAD01E-01

EEPROM
128x16
8bit
8bit

Latch

Block Diagram
2012/09

ASAHI KASEI
• Ordering Guide AK9822M
8pin SSOP
[AK9822]
• Pin Layout
8pin SSOP（Pin
• Pin Description

Pin Name

I/O Analog Output Pin I Chip Select Pin

Function Schmitt-trigger input

I Serial Clock Pin

Schmitt-trigger input

O Serial Data Output Pin

Ground Pin

I Serial Data Input Pin

Power Supply

O Analog Output Pin

DAD01E-01
2012/09

ASAHI KASEI
[AK9822]

Functional Description

The AK9822 is composed of EEPROM and the 8bit D/A converter of two channels with the output buffer amplifier. The AK9822 can connect to the serial communication port of popular one chip microcomputer directly 3 line negative clock synchronous interface . The AK9822 takes the data of the DI pin by the rising edge of the SK pin and outputs the data from the DO pin by the falling edge of the SK pin. The AK9822 has 7 instructions such as READ, WRITE, WREN, WRDS, PDEN, PDDS and CALL. The AK9822 is operated by inputting these instructions from the serial interface. Each instruction is organized by op-code block 8bits , address block 8bits and data 8bitsx2 . The DO pin is "Hi-Z" state except that the DO pin outputs the data of the internal register and the status of Ready/Busy.
• WRITE protection function There are two states such as the WRITE enable state and the WRITE disable state in the AK9822. In the WRITE disable state the WRITE instruction becomes invalid and is not executed. When Vcc is applied to the part, the part powers up in the WRITE disable state and the part becomes the WRITE enable state by inputting the WREN instruction. The WRITE enable state continues until the WRDS instruction is executed or Vcc is removed from the part. Execution of a READ instruction is independent of both WREN and WRDS instructions.
• Power down function There are two modes such as the power down mode and the normal mode in the AK9822. When the AK9822 is in the power down mode, the D/A converter section is in the standby state. At this time, the outputs of the D/A converters become "Hi-Z".

When Vcc is applied to the part, the AK9822 is in the power down mode. When a AUTO READ function is executed, the part becomes the normal mode. After the AUTO READ function is executed, the mode of the part can be switched by the PDEN and PDDS instructions. The AK9822 becomes the power down mode by inputting the PDEN instruction. The part is in the power down mode until the PDDS instruction is executed. When the PDDS instruction is executed, the part becomes the normal mode. When returning to the normal mode from the power down mode, the D/A converters output the voltage value set before entering the power down mode. The relation between the D/A converter state and the mode are shown in the table

Mode

State of D/A converter

Power down mode
standby

Normal mode
normal

Table The relation between the state of D/A converter and the mode

DAD01E-01
2012/09

ASAHI KASEI
[AK9822]
• Output of D/A converter

The output of the D/A converters can be set by the WRITE and the CALL instructions.

Upper 8bit data of the first address of the internal EEPROM the address "0"
corresponds to "AO" of the D/A converter output. Lower 8bit data of the address
"0" corresponds to "A1". The internal composition of EEPROM is shown in the table2.

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Datasheet ID: AK9822M 515940