AK9822 datasheet, PDF - EEWORLD Datasheet

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AK9822: Description2K / 4Kbit EEPROM with 2ch 8bit D/A Converter; CategoryAnalog mixed-signal IC converter; File Size176KB，17 Pages; ManufacturerAKM [Asahi Kasei Microsystems]

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AK9822 Overview

2K / 4Kbit EEPROM with 2ch 8bit D/A Converter

AK9822 Parametric

Parameter Name	Attribute value
Maker	AKM [Asahi Kasei Microsystems]
Parts packaging code	SOIC
package instruction	LSSOP,
Contacts	8
Reach Compliance Code	unknow
Is Samacsys	N
Converter type	D/A CONVERTER
Enter bit code	BINARY
Input format	SERIAL
JESD-30 code	R-PDSO-G8
length	4.4 mm
Number of digits	8
Number of functions	2
Number of terminals	8
Package body material	PLASTIC/EPOXY
encapsulated code	LSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Certification status	Not Qualified
Maximum seat height	1.45 mm
Nominal supply voltage	3.3 V
surface mount	YES
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
width	3.5 mm
Base Number Matches	1

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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

16bit

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

: 1.8V∼5.5V

•

D/A Converter Section : 2.7V∼5.5V

Power Down Function

Block Diagram

DAD01E-00

-1-

1999/05

ASAHI KASEI

[AK9822/24]

Functional Description

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 (8bitsÕ2).

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 AK9822/24 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 AK9822/24 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

DAD01E-00

-3-

1999/05

ASAHI KASEI

[AK9822/24]

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 (D15∼D8) of the first address of the internal EEPROM (the address "0")

corresponds to "AO" of the D/A converter output. Lower 8bit data (D7∼D0) of the address "0"

corresponds to "A1". The internal composition of EEPROM is shown in the table2.

Address

127(AK9822)

/255(AK9824)

D15∼D8

Set data of A0

D7∼D0

Set data of A1

General purpose memory

Table2. Internal composition of EEPROM

If the WRITE instruction by which the address "0" is specified is executed at the normal mode, the

outputs of the D/A converter of A0 and A1 are set by the specified data.

When the WRITE instruction by which the address "0" is specified is executed at the WRITE enable

state and the normal mode, the data is written in the address "0" of EEPROM and the outputs of the

D/A converter are set. When the WRITE instruction by which the address "0" is specified is

executed at the WRITE disable state and the normal mode, the data is not written in EEPROM and

the outputs of the D/A converter are set. Table3 shows the relation between EEPROM, D/A

converter and WRITE instruction.

State of AK9822/24

Power down

mode

Normal mode

WRITE enable

WRITE disable

WRITE enable

WRITE disable

State of address"0"

The data change to the specified data.

The data does not change.

The data change to the specified data.

The data does not change.

Output of A0 and A1

The DAC outputs

are "Hi-Z".

The DAC outputs

change to the

specified data.

Table3. Relation between EEPROM, D/A converter and WRITE instruction

If the CALL instruction is executed, the outputs of the D/A converter are set by the data of the

general purpose memory (AK9822:address "1" -"127", AK9824:address "1" -"255"). The CALL

instruction is composed by the op-code and the address.

When the CALL instruction is executed at the normal mode, the D/A converter output of A0 is set by

the upper 8bit data (D15∼D8) of the specified address and the output of A1 is set by the lower 8bit

data (D7∼D0). The CALL instruction is not executed at the power down mode.

DAD01E-00

-4-

1999/05

AK9822 Related Products

	AK9822	AK9822M	AK9824M	AK9824
Description	2K / 4Kbit EEPROM with 2ch 8bit D/A Converter	2K / 4Kbit EEPROM with 2ch 8bit D/A Converter	2K / 4Kbit EEPROM with 2ch 8bit D/A Converter	2K / 4Kbit EEPROM with 2ch 8bit D/A Converter
Maker	AKM [Asahi Kasei Microsystems]	AKM [Asahi Kasei Microsystems]	AKM [Asahi Kasei Microsystems]	-
Parts packaging code	SOIC	SOIC	SOIC	-
package instruction	LSSOP,	LSSOP,	LSSOP,	-
Contacts	8	8	8	-
Reach Compliance Code	unknow	unknow	unknow	-
Converter type	D/A CONVERTER	D/A CONVERTER	D/A CONVERTER	-
Enter bit code	BINARY	BINARY	BINARY	-
Input format	SERIAL	SERIAL	SERIAL	-
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	-
length	4.4 mm	4.4 mm	4.4 mm	-
Number of digits	8	8	8	-
Number of functions	2	2	2	-
Number of terminals	8	8	8	-
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-
encapsulated code	LSSOP	LSSOP	LSSOP	-
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	-
Package form	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	-
Certification status	Not Qualified	Not Qualified	Not Qualified	-
Maximum seat height	1.45 mm	1.45 mm	1.45 mm	-
surface mount	YES	YES	YES	-
Terminal form	GULL WING	GULL WING	GULL WING	-
Terminal pitch	0.65 mm	0.65 mm	0.65 mm	-
Terminal location	DUAL	DUAL	DUAL	-
width	3.5 mm	3.5 mm	3.5 mm	-

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