Rainbow-electronics MAX1386 Manual de usuario descargar pdf (Pagina 40)

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

40 ______________________________________________________________________________________

2) The MAX1385/MAX1386 then transmit the contents

of the last register accessed starting with the most

significant 8-bit byte of the 16-bit word. MSBs are

sent first. Afterwards, the master needs to send an

ACK bit.

3) The MAX1385/MAX1386 transmit the least signifi-

cant 8-bit byte of the 16-bit word. MSBs are sent

first.

4) The master issues a NACK bit and then generates a

repeated START or STOP condition (Sr or P).

Poll the current register by omitting step 4 and continu-

ing to issue ACK bits after each data byte.

Stringing Commands

The MAX1385/MAX1386 allow commands to be strung

together to minimize configuration time, which is espe-

cially useful in HS mode. Figure 12 shows an example

of stringing a write and read command together to form

a write/readback command.

Figure 13 shows another useful sequence for a read-

modify-write application.

Slave Address Byte

The MAX1385/MAX1386 include a 7-bit-long slave

address. The first 4 bits (MSBs) of the slave address

are factory programmed and always 0x4h. The logic

state of the address inputs (A2, A1, and A0) determine

the 3 LSBs of the device address (see Figure 14).

Connect A2, A1, and A0 to DV

or DGND. A maxi-

mum of eight MAX1385/MAX1386 devices can be con-

nected on the same bus at one time using these

address inputs.

The 8th bit of the address byte is a R/W bit. The

address byte R/W bit is set to 0 to notify the device that

a command byte will be written to the device next. The

address byte R/W bit is set to 1 to notify the device that

a control byte will not be sent and to immediately send

data from the last accessed register.

WRITE WORD FORMAT

ADDRESS

R/W

ACK

WRITE

COMMAND

ACK DATA ACK Sr OR P

7 BITS 8 BITS 0

DATA

S OR Sr ADDRESS ACK Sr OR P

S OR Sr ADDRESS ACK ACK DATA ACK

DATA

ACK

Sr OR PACK

ADDRESS ACK

READ

COMMAND

ACK Sr ADDRESS ACK DATA ACK DATA NACK

Sr OR P

DATA ACK DATA NACK

8 BITS (MSB)

8 BITS (LSB)

WRITE BLOCK FORMAT

7 BITS 8 BITS

R/W

WRITE

COMMAND

8 BITS (MSB)

8 BITS (LSB)

N 3-BYTE SEQUENCES (S, Sr, AND P NOT NEEDED)

8 BITS (MSB)

8 BITS (LSB)

R/WR/W

7 BITS 8 BITS

7 BITS

5-BYTE READ

3-BYTE READ

R/W

7 BITS

8 BITS (MSB)

8 BITS (LSB)

S OR Sr

Figure 11. Read/Write Formats

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 51 52

MAX1385/MAX1386 1
C/SPI Interface 1

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