Rainbow-electronics MAX1386 Manual de usuario descargar pdf (Pagina 39)

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

______________________________________________________________________________________ 39

16 bits of data from a MAX1385/MAX1386 register (see

Figure 11):

1) After generating a START condition (S or Sr),

address the MAX1385/MAX1386 by sending the

appropriate slave address byte and its correspond-

ing R/W bit set to a 0 (see the

Slave Address Byte

section). The MAX1385/MAX1386 then answer with

an ACK bit (see the

Acknowledge Bits

section).

2) Send the appropriate read command byte (see the

Command Byte

section). The MAX1385/MAX1386

answer with an ACK bit.

3) After generating a repeated START condition (Sr),

address the MAX1385/MAX1386 once more by

sending the appropriate slave address byte and its

R/W bit set to 1. The MAX1385/MAX1386 answer

with an ACK bit.

4) The MAX1385/MAX1386 transmit the most signifi-

cant 8-bit data byte of the 16-bit data word with the

MSB first. Afterwards, the master needs to send an

ACK bit.

5) The MAX1385/MAX1386 transmit the least signifi-

cant 8-bit byte of the 16-bit word with the MSB first.

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

repeated START or STOP condition (Sr or P).

Continue to poll the current register or read multiple

words (e.g., empty FIFO of several conversion results)

by omitting step 6 and keep issuing ACK bits after each

data byte. Use the following 3-byte sequence to read

16 bits of data from the last accessed MAX1385/

MAX1386 register:

1) After generating a START condition (S or Sr),

address the MAX1385/MAX1386 by sending the

appropriate 7-bit slave address byte and its corre-

sponding R/W bit set to 1 (see the

Slave Address

Byte

section). The MAX1385/MAX1386 then answer

with an ACK bit (see the

Acknowledge Bits

section).

DATA BITS

D15 D14 D13 D12 D11 D0

CONVERSION ORIGIN

0 0 0 0 MSB LSB Internal temperature sensor

0 0 0 1 MSB LSB Channel 1 external temperature

0 0 1 0 MSB LSB Channel 1 drain current (PGAOUT1)

0 0 1 1 MSB LSB ADCIN1

0 1 0 0 MSB LSB Channel 2 external temperature

0 1 0 1 MSB LSB Channel 2 drain current (PGAOUT2)

0 1 1 0 MSB LSB ADCIN2

0 1 1 1 — — Reserved

1 0 0 0 — — Reserved

1 0 0 1 — — Reserved

1 0 1 0 — — Reserved

1 0 1 1 — — Reserved

1 1 0 0 — — Reserved

1 1 0 1 — — Reserved

1110MSB LSB

Conversion may be corrupted. This occurs only when

arriving data causes the FIFO to overflow at the same time

data is being read out.

1111MSB

BITS D11–D0 CONTAIN THE CONVERSION RESULT

LSB

Empty FIFO. The current value of the Flag register is

provided in place of the FIFO data.

Table 23. FIFO (Read)

DATA BITS POR FUNCTION

D15–D10 X Don’t care.

D9–D0 00 0000 0000

10-bit fine DAC input code.

D9 is the MSB.

Table 24. RDFINE1 and RDFINE2 (Read)

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 51 52

MAX1385/MAX1386 1
C/SPI Interface 1

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