CXA1875AM 查看數據表（PDF） - Sony Semiconductor

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CXA1875AM

8-bit D/A Converter Compatible with I2C Bus

Sony Semiconductor 

CXA1875AP/AM

<Registers> In brackets ( ) number of bits

REF

(1): Switches D/A converter reference voltage

0:Standardizes the inner regulator

1:Standardizes voltage resistance divided from VCC

SW0 to 3 (1):

Selects ON/OFF of Pins 1, 2, 9 and 10

(Each pin is the open collector output of NPN transistor)

0:OFF

1:ON

DAC0 to 4 (8):

Digital data input register of D/A converter

0:Output voltage turns to minimum

255:Output voltage turns to maximum

PONRES (1):

Detects POWER ON RESET

0:Master passes from the bus and is reset to 0 after having read this status

1:Set to 1 when power supply is turned on or when there has been a power dip

ST0 to 3 (1):

Detects and registers the voltage condition of Pins 1, 2, 9 and 10

0:1.5 V and below

1:3.0 V and above

Note) SW0 to 3 effective during 0

I2C Bus Signal

There are 2 signals in I2C bus. SDA (Serial DAta) and SCL (Serial Clock).

SDA is double-way.

• As SDA is double-way it has 3 state outputs, H, L and HIZ.

H

L

HIZ

L

• I2C transfer begins with Start Condition and ends with Stop Condition.

Start Condition S

SDA

SCL

Stop Condition P

—7—

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