Details, datasheet, quote on part number: AK9822M
Description2K/4Kbit EePROM With 2ch 8bit D/A Converter
CompanyAKM Semiconductor, Inc.
DatasheetDownload AK9822M datasheet
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Features, Applications

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.


EEPROM section AK9822 128 words AK9824 256 words 16bit One chip microcomputer interface Sequential register read D/A Converter section 2 channel Resolution : 8bit Differential Non-Linearity : 1.0 LSB Linearity Error : 1.5 LSB Output Voltage Range : GND VCC Wide VCC operation EEPROM section : 1.8V5.5V D/A Converter Section : 2.7V5.5V Power Down Function

Pin Description No. Pin Name SK DO GND DI VCC AO0 I/O Analog Output Pin Chip Select Pin Serial Clock Pin Serial Data Output Pin Ground Pin Serial Data Input Pin Power Supply Analog Output Pin (Schmitt-trigger input) (Schmitt-trigger input) Function

The AK9822/24 is composed of EEPROM and the 8bit D/A converter of two channels with the output buffer amplifier. The AK9822/24 can connect to the serial communication port of popular one chip microcomputer directly (3 line negative clock synchronous interface). The AK9822/24 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 AK9822/24 has 7 instructions such as READ, WRITE, WREN, WRDS, PDEN, PDDS and CALL. The AK9822/24 is operated by inputting these instructions from the serial interface. Each instruction is organized by op-code block (8bits), address block (8bits) and data (8bits2). 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 AK9822/24. 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 AK9822/24. When the 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 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 AK9822/24 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 1. Mode Power down mode Normal mode State of D/A converter standby normal

Table 1. The relation between the state of D/A converter and the mode


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