MAX11068EVKIT+ Maxim Integrated Products, MAX11068EVKIT+ Datasheet - Page 53

• 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: -

Table 34. DIAG—Diagnostic Data Register Description (Address 0x44)
The MAX11068 uses an SMBus ladder I
interface with customized I
communicate with the host system and from module
to module. Each device contains two I
master and one slave. The slave port is the lower port,
referenced to the chip ground, and communicates with
the host master or the master from a device lower on the
SMBus ladder. The upper port is a master port that is
level shifted and referenced to GND
nication with devices higher on the SMBus ladder and
gathers information to be passed back toward the host.
The two ports act together with the help of a digital con-
troller to bridge two separate links of the SMBus ladder.
Each link between master and slave of interconnected
MAX11068 devices can be thought of as its own bus
under the control of the master side device. A standard
I
master implemented with firmware and general-purpose
I/O pins is all that is required to successfully implement
the physical communication bus. This level-shifted dual-
port scheme allows modules to be easily stacked without
2
C hardware master found in many microcontrollers or a
D15
D14
D13
D12
D11
D10
PIN
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
12-Channel, High-Voltage Sensor, Smart
NAME
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
2
C command protocol to
12-bit ADC conversion result on the diagnostic data value. This diagnostic tests the toler-
ance of the reference, the stability of the internal regulator, and the open/short status of cell
input C0. The converter delivers the data value based on the following formula:
DIAG = ((REF - C0) x 0.5)/VAA x 4096
The nominal value for normal operation is 5E1h with a tolerance of Q150 LSBs. The REF
open case also has a special FMEA detector that has a separate alert, ALRTREF, in the
FMEA register.
Write ignored; read back 0.
I
2
U
C Interface
. It drives commu-
2
C ports, one
2
Overview
C physical
Data-Acquisition Interface
the need for costly and complex galvanic isolation of
the communication lines while providing very-high-noise
rejection.
The physical I
consists of a master block and a slave block. The master
block is level shifted and referenced to the GND
ply voltage. A digital controller manages each block and
coordinates the passing of commands and data between
the two as needed. The two standard I
for all ports are SCL for the serial data clock and SDA for
the serial data line. Additional status pins used to com-
plement the I
ground-referenced ALRM
ALRM
interrupt signal that the host can use to determine the
health of the bus. To support the level-shifted I/O pins, a
level-shifted supply, VDD
charge pump and referenced to GND
provides a pullup voltage to the level-shifted bus com-
munication signals. Figure 28 shows the simplified view
of the I
first device in an SMBus ladder.
U
2
C physical interface from the perspective of the
FUNCTION
input. These pins act as an SMBus-laddered
2
C communication in the MAX11068 are the
I
2
2
C interface for each MAX11068 device
C Physical Interface Operation
U
L
, is generated by an internal
output and the level-shifted
2
C interface pins
U.
This supply
U
sup-
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