參數(shù)資料
型號(hào)： AK9844F
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： Aluminum Snap-In Capacitor; Capacitance: 470uF; Voltage: 160V; Case Size: 25x25 mm; Packaging: Bulk
中文描述： 4Kbit EEPROM，帶有4通道8位D / A轉(zhuǎn)換
文件頁(yè)數(shù)： 5/17頁(yè)
文件大?。?/td> 156K
代理商： AK9844F
ASAHI KASEI
[AK9844]
DAD02E-00
1999/05
- 5 -
Output of D/A converter
The AK9844 includes 4 channel, 8bit D/A converter. The output voltage ranges for AO0 and AO1 are set by
the VREF1 pin and the output voltage ranges for AO2 and AO3 are set by the VREF2 pin.
The output voltage can be set by the READ or WRITE instruction.
When the DAC register block is specified in the WRITE instruction, the output voltage for the specified D/A
converter is set. When the WRITE instruction is executed in case that the PROTECT pin is "H" and the
programming state is enabled, the output voltage for the specified D/A converter is set and the specified
address in the DAC register block in EEPROM is written with the data specified in the instruction.
When the WRITE instruction is executed in case that the PROTECT pin is "H" and the programming state is
disabled, the output voltage for the specified D/A converter is set and the specified address in the DAC
register block in EEPROM is not written with the data specified in the instruction. When the WRITE instruction
is executed in case that the PROTECT pin is "L", the output voltage for the specified D/A converter is not set
and the specified address in the DAC register block in EEPROM is not written with the data specified in the
instruction. The relation between the WRITE instruction and the DAC register block is showed on the table.2.
When the DAC register block is specified in the READ instruction, the output voltage for the specified D/A
converter is set by the data which is stored in the DAC register block in EEPROM, and the DO pin outputs the
data in the specified address.
Execution of the READ instruction is independent of the PROTECT pin and the programming state.
PROTECT
pin
"H"
Programming
State
Enable
DAC register block
(EEPROM Section)
Output of DAC
(D/A Converter Section)
The output voltage for the
specified D/A converter is
set by the data specified
in the instruction.
The specified address in the
DAC register block is written
with the data specified in
the instruction.
The data in the DAC register
section does not change.
Disable
Enable
Disable
Table.2 Relation between the WRITE instruction and the DAC register block
"L"
The output of the DAC
does not change.
{
AUTO READ Function
When Vcc is applied to the AK9844, the data on EEPROM are read out and loaded at a time to each
corresponding D/A (4 channels total) automatically, starting from AO0 to AO3 in ascending order. Then each
D/A analog output is settled to pre-determined value.
If the CS pin goes to "H" and then goes to "L" after "power-up" with the PROTECT pin and the CS pin left "L",
AUTO READ cycle is initiated. After the CS pin goes to "L", 4 channel D/A outputs are settled to pre-
determined value within 2ms.
In AUTO READ cycle, the SK pin and the DI pin become "don't care" and the serial data do not output.
If the WREN instruction is executed after AUTO READ cycle is completed, programming into the memory
block on the internal EEPROM is enabled.
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