BQ76PL455APFCT datasheet(118/125 Pages) TI1

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118

bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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11 Device and Documentation Support

11.1 Device Support

11.1.1 Development Support

An evaluation module (EVM), with an associated PC-based Graphical User Interface (GUI) program, is available.

Please see Related Documentation for the reference numbers for the evaluation module and its associated

interface software.

11.1.2 Device-Specific Terminology

AFE

Analog front-end. A set of analog signal-conditioning circuitry that uses operational amplifiers and

filters to provide a configurable and flexible-electronics functional block, which is needed to

interface a variety of sensors to a microcontroller or an analog-to-digital converter.

Battery

A collection of series and parallel connected cells with a single set of high voltage (+) and (–)

outputs, which power the vehicle.

BIST

Built-in-Self-Test. A feature of the part allowing testing of critical and other blocks for correct

operation. Testing is user controlled and may include external components. Built-In Self Tests can

be used optionally as a diagnostic check of defined internal functions of the bq76PL455A-Q1.

BMS

Battery Monitor System (or battery management system), a system of bq76PL455A-Q1s connected

together and then to a microcontroller (µC) for measuring, monitoring, and controlling a stacked

series of cells forming a battery pack.

Cell

An individual cell or group of cells connected in parallel. Cells are connected to VSENSE inputs and

connected in series to form modules and stacks of cells to form a battery.

Daisy-Chain A series-connected string of monitoring devices, that is, bq76PL455A-Q1 devices communicating

to a base device by passing the communications signals through DC blocking devices and the

bq76PL455A-Q1 integrated circuits (ICs) in the string. In the case of the bq76PL455A-Q1, a

suitably rated capacitor is used as the DC block. A differential communications link is used to form

the daisy-chain of the bq76PL455A-Q1. “Daisy-chain” usually refers to just the communications

links, but is sometimes used to refer to the collection of devices and cells.

Differential-Signaling Differential signaling sends a digital signal and its complement simultaneously over a

pair of wires. The receiver is sensitive to the difference of the two signals, not the absolute

amplitude of either signal by itself. The wire pair is usually twisted so that any interfering signal

affects both equally as a common-mode signal. The result is that differential signaling offers much

higher common-mode rejection ratios (CMRR) than single-ended signals and results in much better

noise rejection.

LPF

Low Pass Filter made up of one or more R/C combinations where the resistor is in series with the

signal and the capacitor is on the load side and connected to “ground”. Each R/C element

contributes one time constant or tau.

Module

A collection of cells connected in series monitored by one bq76PL455A-Q1. This is typically 16

cells, but may be fewer as needed. Modules may be connected in series to form stacks and

complete battery packs. The bq76PL455A-Q1s are also typically connected in a series daisy-chain

to facilitate communications to a microcontroller.

Stack

A collection of modules of cells. Stack and battery are synonymous in most applications.

VCELL

The voltage from one cell or group of parallel connected cells, which is measured across two

VSENSE pins, for example, VSENSEn and VSENSEn-1.

VMODULE

The voltage from a collection of series connected cells forming a module. The voltage is measured

by the device from the TOP pin to GND.

VSTACK

The voltage from a collection of series connected cells forming a stack or battery pack. This is often

a high voltage. The voltage is not measured directly by the bq76PL455A-Q1, but may be calculated

by adding all of the individual cell voltages in the stack or by adding together all of the VMODULE

voltages in the stack. These should produce approximately the same value.

BQ76PL455APFCT Datasheet(PDF) 118 Page - Texas Instruments

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