MAX11068EVKIT+ Maxim Integrated Products, MAX11068EVKIT+ Datasheet - Page 62

• Manufacturer Part Number: MAX11068EVKIT+
• Description: KIT SMART BATT MEASUREMENT 12CH
• Manufacturer: Maxim Integrated Products

Specifications of MAX11068EVKIT+

• Main Purpose: Power Management, Battery Monitor, Car
• Utilized Ic / Part: MAX11068
• Primary Attributes: Monitors Current, Voltage, Temperature
• Secondary Attributes: 1 ~ 12 Cell- Li-Ion, 1 ~ 12 Cell- NiMH
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Embedded: -

12-Channel, High-Voltage Sensor, Smart
Data-Acquisition Interface
low data byte and then the upper data byte follow the
command byte. Finally, the PEC is sent and a stop event
ends the communication sequence. Figure 35 shows the
I
mand. Figure 36 shows the WRITEALL command SMBus
ladder sequences with four modules.
The PEC byte must be supplied with the WRITEALL
command. It is calculated from the first 4 bytes of the
command. If any MAX11068 device does not receive
a packet with a consistent PEC, it will not perform the
command or the register writes. It will also generate a
PEC alert in the status register, and this may (option-
ally) cause the suspension of the alarm heartbeat. Due
to bus noise, it is possible for some devices to receive
Figure 35. I
Figure 36. WRITEALL Command SMBus Ladder Sequences with Four Modules
62
2
C communication sequence for the WRITEALL com-
SDA
SDA
SCL
SCL
S
I
2
HOST TO IC1
C BUS LINK
2
IC1 TO IC2
IC2 TO IC3
IC3 TO IC4
IC4 TO N.C.
B7
C Communication Sequence for the WRITEALL Command
B6
B5
I
LOW DATA BYTE
2
NOTE: SHOWN IS THE 1Fs FOWARDING DELAY FROM ONE BUS LINK
C BUS FORWARDING DATA STREAM
S
B4
S
LEVEL TO THE NEXT. NOT DRAWN TO SCALE.
S
B[7:1]+W
B3
S
B[7:1]+W
S
B2
B[7:1]+W
B[7:1]+W
B1
B[7:1]+W
A
A
W
A
00000001
A
00000001
A
A
N
00000001
C7
00000001
P
A
C6
A
C7
A
XXXXXXXX
HIGH DATA BYTE
A
XXXXXXXX
C4
XXXXXXXX
C3
XXXXXXXX
a consistent PEC while others may not. In this case, an
enabled PEC alarm can signal the overall problem while
a READALL command can check the status registers to
reveal which specific devices failed to correctly receive
the command. When using the WRITEALL command to
change the broadcast register, it is important to verify
that the command was executed by all known devices.
This can be accomplished by enabling the PEC alarm
and verifying that the WRITEALL was successful, or by
performing a READALL after the WRITEALL and making
sure a response was received from all expected devices.
If a response was not received from all devices, steps
should be taken to rewrite the new broadcast address or
determine if a device has been removed from the stack.
C2
A
A
C1
A
ADDRESS MSB
A
C0
ADDRESS MSB
ADDRESS MSB
A
A
ADDRESS MSB
A
A
A
PEC
A
PEC
PEC
PEC
PEC
A
A
P
A
P
A
P
P
A
P