MAX11068EVKIT+ Maxim Integrated Products, MAX11068EVKIT+ Datasheet - Page 66

• 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
Figure 41. I
Figure 41 shows the I
diagrams.
The HELLOALL command automatically assigns each
device a unique address. This address can be used
during a WRITEDEVICE command to write to only one
selected device in the SMBus ladder, and is also read
during the ROLLCALL command to identify all the unique
active devices present on the bus. When all the device
addresses are known, the last device in the chain can
be identified and made known to all ports. It is important
for each node and the host to know the relationship of
devices that make up the SMBus ladder so that the PEC
byte used in some command protocols can be properly
located and calculated.
The device address of the first device in the SMBus lad-
der stack is specified with the HELLOALL command.
This address is incremented by 1 before being sent to
each successive downstream device. The maximum
device address is 0x1Fh and the address counter wraps
to 0 if the starting address was set too high for the num-
ber of devices in the chain. The SMBus-laddered devic-
es only forward WRITEDEVICE commands that have a
66
SDA
SCL
SCL
SDA
U
U
L
L
P
2
C Lower and Upper Port Timing Diagrams
I
t
BUF
I
2
2
C Functional Description
C Port Timing Diagrams
S
t
HD-STA
2
C lower and upper port timing
t
t
LOW
LS-DAT
Autoaddressing
DATA
t
LS-CLK
t
HD-DAT
t
DATA
MCL-MIN
t
HD-DAT
higher device address than their own. So, some devices
are not addressable if the addresses A[0:4] written by
HELLOALL are allowed to wrap past 0x1Fh.
When a pack is removed or inserted, the SMBus lad-
der must be reconfigured. The HELLOALL, ROLLCALL,
and SETLASTADDRESS sequence should be used to
reinitialize the device addresses and the address of the
last device.
If the SCL
28ms, then any transaction is aborted and the device
behaves as if it observed a STOP condition. The host
can ensure that all devices are in a “ready-to-communi-
cate” state by remaining idle for longer than 28ms.
For optimal data transfer, the host microcontroller should
make extensive use of the WRITEALL and READALL
commands. One READALL or ROLLCALL command
consumes the following amount of time based on the
number of bits in the command protocol and the number
of devices in the SMBus ladder:
t
SU-DAT
t
READALL
U
DATA
input remains high or low for longer than
t
HIGH
=
+
(
5 8 bits 5 bits 3 bits
N
×
MODULES
Pack Insertion and Removal
DATA
Communication Timeout
+
×
(
16 bits 2 bits
+
Interface Speed
+
DATA
)
×
t
SCL
)
×
DATA
t
SCL