Dual RF LDMOS Bias Controllers
with I 2 C/SPI Interface
Table 23. FIFO (Read)
D15
0
0
0
0
0
0
0
0
1
1
1
1
1
1
D14
0
0
0
0
1
1
1
1
0
0
0
0
1
1
D13
0
0
1
1
0
0
1
1
0
0
1
1
0
0
DATA BITS
D12
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D11
MSB
MSB
MSB
MSB
MSB
MSB
MSB
D0
LSB
LSB
LSB
LSB
LSB
LSB
LSB
CONVERSION ORIGIN
Internal temperature sensor
Channel 1 external temperature
Channel 1 drain current (PGAOUT1)
ADCIN1
Channel 2 external temperature
Channel 2 drain current (PGAOUT2)
ADCIN2
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Conversion may be corrupted. This occurs only when
1
1
1
0
MSB
LSB
arriving data causes the FIFO to overflow at the same time
data is being read out.
1
1
1
1
MSB
LSB
Empty FIFO. The current value of the Flag register is
provided in place of the FIFO data.
16 bits of data from a MAX1385/MAX1386 register (see
Figure 11):
Table 24. RDFINE1 and RDFINE2 (Read)
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
DATA BITS
D15–D10
D9–D0
POR
X
00 0000 0000
FUNCTION
Don’t care.
10-bit fine DAC input code.
D9 is the MSB.
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).
______________________________________________________________________________________
39
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