MAX6618 Maxim Integrated Products, MAX6618 Datasheet - Page 14

• Manufacturer Part Number: MAX6618
• Description: PECI-to-I2C Translator
• Manufacturer: Maxim Integrated Products

The acknowledge bit is a clocked 9th bit that the recipi-
ent uses to handshake receipt of each byte of data
(Figure 8). Thus, each byte transferred effectively
requires 9 bits. The master generates the 9th clock
pulse, and the recipient pulls down SDA during the
acknowledge clock pulse so that the SDA line is stable
low during the high period of the clock pulse. When the
master is transmitting to the MAX6618, the MAX6618
generates the acknowledge bit because the MAX6618
is the recipient. When the MAX6618 is transmitting to
the master, the master generates the acknowledge bit
because the master is the recipient.
The MAX6618 has a 7-bit long slave address (Figure 9).
The 8th bit following the 7-bit slave address is the R/W
bit. The R/W bit is low for a write command and high for
a read command.
The first four bits of the MAX6618 slave address (A6:A3)
are always 0101. Bits A2:A1 are set during the manufac-
turing process to 0:1 (A2:A1 = 1:0 is a factory option). A0
is selected by the address input AD0. AD0 can be con-
nected to GND or V
PECI-to-I
Figure 8. Acknowledge
14
TRANSMITTER
RECEIVER
______________________________________________________________________________________
SDA BY
SDA BY
SCL
CONDITION
START
S
1
CC
2
. The MAX6618 has two possible
C Translator
2
FOR ACKNOWLEDGEMENT
CLOCK PULSE
Slave Address
8
9
slave addresses selectable by AD0, and values for
A2:A1 available by factory programming. Therefore, a
maximum of four MAX6618 devices can be controlled
independently from the same interface (see the I
Address Range section).
A write to the MAX6618 consists of the transmission of
the MAX6618’s slave address with the R/W bit set to
zero, followed by at least 1 byte of information. The first
byte of information is the command byte. The com-
mand byte determines which register of the MAX6618
is to be written to by the next byte or read from during
the next read transmission. If a STOP condition is
detected after the command byte is received, then the
MAX6618 takes no further action beyond setting the
register address.
The bytes received after the command byte are data
bytes. The data bytes go into the register of the
MAX6618 specified by the command byte. Only the last
data byte or word transmitted before a STOP condition
is stored by the device (Figure 10).
Figure 9. Slave Address
SDA
SCL
Message Format for Writing to the MAX6618
0
1
0
1
A2
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A1
A0
ACK
2
C