Rainbow-electronics MAX1386 Bedienungsanleitung PDF herunterladen (Seite 44)

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

44 ______________________________________________________________________________________

3) Send 16 bits of data (D15–D0) starting with the most

significant bit and ending with the least significant

bit. Data is clocked in on the rising edges of SCL.

4) Pull CSB high.

Read Format

Use the following sequence to read 16 bits of data from

a MAX1385/MAX1386 register (see Figure 19):

1) Pull CSB low to select the device.

2) Send the appropriate read command byte (see the

Command Byte

section). The command byte is

clocked in on the rising edges of SCL.

3) Receive 16 bits of data. Data is clocked out on the

falling edges of SCL.

4) Pull CSB high.

Command Byte

The MAX1385/MAX1386 use read and write command

bytes. The command byte consists of 8 bits and contains

the address of the register (C7–C0, see Figures 18 and

19). The command byte also communicates to the

device whether a read or write operation occurs. See the

section for details on how to access

specific registers through the command byte.

Data Bytes

Data bytes are clocked in/out of the device with the

most significant bit first and the least significant bit last

(D15–D0, see Figures 18 and 19). See the

Description

section for a description of data bytes for

each register.

SCL

SDA

NOT ACKNOWLEDGE

ACKNOWLEDGE

Figure 20. Acknowledge Bits

SCL

C6 C5 C4 C3 C2 C1 C0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

CR/W

DIN

CSB

A RISING EDGE OF CSB

DURING THIS PERIOD

COMPLETES A VALID

WRITE COMMAND.

Figure 18. SPI Write Format

SCL

C6 C5 C4 C3 C2 C1 C0

D15 D14 D13 D12 D11 D10 D9 D8

D7 D6 D5 D4 D3 D2 D1 D0

CR/W

DIN

CSB

DOUT

Figure 19. SPI Read Format

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 50 51 52

MAX1385/MAX1386 1
C/SPI Interface 1

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