Rainbow-electronics MAX5811 Manual do Utilizador descarregar pdf (Página 10)

MAX5811

10-Bit Low Power 2-Wire Interface Serial,

Voltage-Output DAC

10 ______________________________________________________________________________________

write cycle must be repeated. Figure 6 shows two

example write data sequences.

Read Data Format

In read mode (R/W = 1), the MAX5811 writes the con-

tents of the DAC register to the bus. The direction of

Table 3. Command Byte Definitions

SERIAL DATA INPUT

C3 C2 C1 C0 D9/PD1* D8/PD0* D7-D6

FUNCTION

1100

DAC

DATA

DAC

DATA

DAC

DATA

Load DAC with new data from the following data byte 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.

1101

DAC

DATA

DAC

DATA

DAC

DATA

Load input register with data from the following data byte.

DAC output remains unchanged.

1110

DAC

DATA

DAC

DATA

DAC

DATA

Load input register with data from the following data byte.

Update DAC output to the previously stored data.

1111 X X XX

Update DAC output from input register. The device

ignores any new data.

10XX 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 Power up the device.

01XX 0 1 XX

Power-down mode 0. Power down device with output

floating.

01XX 1 0 XX

Power-down mode 1. Power down device with output

terminated with 1kΩ to GND.

01XX 1 1 XX

Power-down mode 2. Power down device with output

terminated with 100kΩ to GND.

MSB

A6 A5 A4 A3 A2 A1 A0 C3 C2 C1 C0 D9 D8 D7 D6

D5 D4 D3 D2 D1 D0 S1 S0 P

R/W ACK

ACK

LSB MSB LSB

LSB

MSB

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

LSB

EXAMPLE WRITE DATA SEQUENCE

EXAMPLE WRITE TO POWER-DOWN REGISTER SEQUENCE

MSB

LSB

Figure 6. Example Write Command Sequences

*When C3 = 0 and C2 = 1, data bits D9 and D8 write to the power-down registers (PD1 and PD0).

X = Don’t care.

1 2 ... 5 6 7 8 9 10 11 12 13

Voltage-Output DAC 1

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