MAX6618 Maxim Integrated Products, MAX6618 Datasheet - Page 16

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

All MAX6618 I
checksum (PEC). The PEC is implemented in accor-
dance with the SMBus specification, versions 1.1 and
2. The MAX6618 accepts commands with or without
PEC. The PEC for device responses is optional and can
be disabled in the CONFIG0 register.
If the MAX6618 is operated on a 2-wire interface with
multiple masters, a master reading the MAX6618
should use a repeated START between the write that
sets the MAX6618’s address pointer, and the read(s)
that takes the data from the location(s) (Table 16). This
is because it is possible for master 2 to take over the
bus after master 1 has set up the MAX6618’s address
pointer, but before master 1 has read the data. If mas-
ter 2 subsequently changes the MAX6618’s address
pointer, master 1’s delayed read can be from an unex-
pected location. The use of multiple masters is not
recommended.
Table 16. MAX6618 Slave Addresses
PECI-to-I
16
______________________________________________________________________________________
(FIXED)
A6:A3
0101
0101
0101
0101
Operation with Multiple Masters
2
C packets have an optional packet error
Applications Information
Packet Error Checksum (PEC)
(FACTORY SET)
2
C Translator
A2:A1
01
01
10
10
(SET BY AD0 PIN)
A0
0
1
0
1
ADDRESS
In addition to the four MSBs (0101), the I
address includes bit A0 (set by the address input AD0)
and bits A2:A1 (set as a factory option to 01 or 10).
Using A2:A0, the address can be configured from 2Ah
to 2Dh (Table 16).
I
to data and clock lines. There are tradeoffs between
power dissipation and speed, and a compromise must
be made in choosing pullup resistor values. Every device
connected to the bus introduces some capacitance even
when the device is not in operation. I
mum 300ns rise time to go from low to high (30% to 70%)
for fast mode, which is defined for a date rate of 400kbps
(refer to the I
rise time requirement, choose pullup resistors so that the
rise time t
low bus capacitances, a 4.7kΩ resistor can be used. For
a bus capacitance of 400pF, choose a pullup resistor
less than 880Ω. Many I
mum specified rise time is not met. However, if the time it
takes for the waveform to rise becomes too slow, these
waveforms are not recognized by the master.
2
SLAVE
C requires pullup resistors to provide a logic-high level
2Ch
2Dh
2Ah
2Bh
R
= 0.85R
2
C specifications for details). To meet the
PULLUP
A2:A1 = 10 is a factory option
A2:A1 = 10 is a factory option
Choosing Pullup Resistors
2
C devices work when the mini-
INCLUDING R/W BIT
I
2
C ADDRESS BYTE
x C
5Ah, 5Bh
54h, 55h
56h, 57h
58h, 59h
I
BUS
2
C Address Range
www.DataSheet4U.com
< 300ns. For typical
2
C specifies a mini-
2
C slave