ADBMS1818CSWAZ-R7 datasheet(24/92 Pages) AD

24 / 92 page

Data Sheet

ADBMS1818

IMPROVEMENTS FROM THE LTC6811-1

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Rev. B | 24 of 92

The ADBMS1818 is an evolution of the LTC6811-1 design. Table 16 summarizes the feature changes and additions in the ADBMS1818.

Table 16.

Additional ADBMS1818 Features

Benefits

Relevant Data Sheet Section(s)

The ADBMS1818 has 3 ADCs operating simultaneously

vs. 2 ADCs on the LTC6811-1.

3 cells can be measured during each conversion cycle.

ADC Operation

In addition to the 3 ADC Digital filters, there is a 4th filter

that is used for redundancy.

Checks that all digital filters are free of faults.

ADC Conversion with Digital Redundancy for a

description and PS, Bits[1:0] in Table 27

Measure Cell 7 with ADC1 and ADC2 simultaneously

and then measure Cell 13 with ADC2 and ADC3

simultaneously using the ADOL command.

Checks that ADC2 is as accurate as ADC1 and also

checks that ADC3 is as accurate as ADC2.

Overlap Cell Measurement (ADOL Command)

A monitoring feature can be enabled during the discharge

timer. Cell balancing can be automatically terminated

when cell voltages reach a programmable undervoltage

threshold.

Improved cell balancing.

Discharge Timer Monitor

The internal discharge MOSFETs can provide 200 mA

of balancing current (80 mA if the die temperature is

over 85°C). The balancing current is independent of cell

voltage.

Faster cell balancing, especially for low cell voltages.

Cell Balancing with Internal MOSFETs

The C0 pin voltage is allowed to range between 0 V and 1

V without affecting the TME.

C0 does not have to connect directly to V–.

ADC DC Specifications

The mute and unmute commands allow the host to turn off

and turn on the discharge pins (S pins) without overwriting

Greater control of timing between S pins. Turning off and

cell measurements.

S Pin Muting

Auxiliary measurements have an open-wire diagnostic

feature

Improved fault detection.

Auxiliary Open Wire Check (AXOW Command)

Four additional GPIO pins have been added for a total of

nine.

Increased number of temperature or other sensors that

can be measured.

Auxiliary (GPIO) Measurements (ADAX Command) and

Auxiliary Open Wire Check (AXOW Command)

A daisy chain of ADBMS1818s can operate in both

directions (both ports can be a master or slave).

Redundant communication path.

Reversible isoSPI

ADBMS1818CSWAZ-R7 数据表(PDF) 24 Page - Analog Devices

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