MAX5812 データシートの表示（PDF） - Maxim Integrated

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MAX5812

12-Bit Low-Power, 2-Wire, Serial Voltage-Output DAC

Maxim Integrated 

12-Bit Low-Power, 2-Wire, Serial

Voltage-Output DAC

Table 3. Command Byte Definitions

SERIAL DATA INPUT

C3

C2

C1

C0 D11/PD1* D10/PD0* D9–D8

FUNCTION

Load DAC with a new data from the following data byte

1

1

0

0

DAC

DATA

DAC

DATA

DAC

DATA

and update DAC output simultaneously as soon as data

is available from the serial bus. The DAC and input

registers are updated with the new data.

1

1

0

1

DAC

DATA

DAC

DATA

DAC

DATA

Load input register with the data from the following data

byte. DAC output remains unchanged.

1

1

1

0

DAC

DATA

DAC

DATA

DAC

DATA

Load input register with data from the following data byte.

Update DAC output to the previously stored data.

1

1

1

1

X

X

XX

Update DAC output from input register. The device will

ignore any new data.

1

0

X

X

X

X

XX

Read data request. Data bits are ignored. The contents of

the DAC register are available on the bus.

0

1

X

X

0

0

XX

Powers up device.

0

1

X

X

0

1

XX

Power-down mode 0. Powers down device with output

floating.

0

1

X

X

1

0

XX

Power-down mode 1. Powers down device with output

terminated with 1kΩ to GND.

0

1

X

X

1

1

XX

Power-down mode 2. Powers down device with output

terminated with 100kΩ to GND.

*When C3 = 0 and C2 = 1, data bits D11 and D10 write to the power-down registers (PD1 and PD0).

X = Don’t care.

MSB

LSB

MSB

LSB

S A6 A5 A4 A3 A2 A1 A0 R/W ACK C3 C2 C1 C0 D11 D10 D9 D8 ACK

MSB

LSB

D7 D6 D5 D4 D3 D2 D1 D0

ACK

P

EXAMPLE WRITE DATA SEQUENCE

MSB

LSB

MSB

LSB

S A6 A5 A4 A3 A2 A1 A0 R/W ACK C3 C2 X X PD1 PD0 X X ACK

P

EXAMPLE WRITE TO POWER-DOWN REGISTER SEQUENCE

Figure 6. Example Write Command Sequences

10 ______________________________________________________________________________________

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