bq76PL536A Battery Monitor
General Features
supports 3 - 6 lithium-ion cells (stackable up to 192 cells)
SPI comm
Supply Voltage Range from 6 V to 30 V Continuous and 36-V Peak
Has built on comparators for protections
Integrates an analog front end (AFE) along with a precision analog-to-digital converter (ADC), used to precisely measure battery cell voltages
Non-volatile memory stores the user-programmable protection thresholds and delay times
Cell Balancing
Six outputs (CB1 to CB6) control the external N-FETs in series with a power resistor
A 1 activates the external balance FET by placing a high on the associated pin.
Internal Voltage Regulators
The bq76PL536A derives power from the BAT pin using several internal low dropout (LDO) voltage regulators.
The BAT pin should be connected to the most-positive cell input from cell 3, 4, 5, or 6, depending on the number of cells connected.
Application Requirements (See page 55 for the Diagram)
An anti-aliasing filter is required for each VCn input VC6–VC1, consisting of a 1-kΩ, 1% series resistor and 100- nF capacitor
Place filter capacitors as close to the IC as possible.
Select the RC filter closest to the cell for filter requirements
Select Zener diode for lowest possible reverse leakage.
A balance FET gate-protection diode is required (RESEARCH THIS)
MOSFET with low turn-on threshold voltage (must turn on with the lowest cell voltage)
The LDOA, LDOD1, LDOD2 and REG50 pins all require a 2.2-µF ceramic capacitor to be placed as closely as possible to the respective pins to optimize stability.
The bq76PL536A requires a power supply with between 7.2 V to 27 V inputs.
VREF and AGND pins require a high-quality 10-µF capacitor be connected between them, in very close physical proximity to the device pins, using short track lengths to minimize the effects of track inductance on signal quality.
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