LTC6803-3 데이터 시트보기 (PDF) - Linear Technology

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LTC6803-3

Multicell Battery Stack Monitor

Linear Technology 

LTC6803-1/LTC6803-3

OPERATION

CSBI

tCYCLE

SCKI

SDI

MSB (CMD) BIT6 (CMD)

SDO

LSB (PEC)

TOGGLE OR LEVEL POLL

680313 F06

Figure 6. Transmission Format (ADC Conversion and Poll)

CSBI

SCKI

SDI

MSB (CMD) BIT6 (CMD)

SDO

LSB (PEC)

TOGGLE OR LEVEL POLL

680313 F07

Figure 7. Transmission Format (PLADC Conversion or PLINT)

Toggle Polling: Toggle polling allows a robust determina-

tion both of device states and of the integrity of the con-

nections between the devices in a stack. Toggle polling is

enabled when the LVLPL bit is low. After entering a polling

command, the data out line will be driven by the slave

devices based on their status. When polling for the ADC

converter status, data out will be low when any device is

busy performing an ADC conversion and will toggle at

1kHz when no device is busy. Similarly, when polling for

interrupt status, the output will be low when any device

has an interrupt condition and will toggle at 1kHz when

none has an interrupt condition.

Toggle Polling—Daisy-Chained Broadcast Polling: The

SDO pin (bottom device) or SDI pin (stacked devices) will

be low if a device is busy/in interrupt. If it is not busy/not

in interrupt, the device will pass the signal from the SDOI

input to data out (if not the top-of-stack device) or toggle

the data out line at 1kHz (if the top-of-stack device). The

master pulls CSBI high to exit polling.

Level Polling: Level polling is enabled when the LVLPL

bit is high. After entering a polling command, the data

out line will be driven by the slave devices based on their

status. When polling for the ADC converter status, data

out will be low when any device is busy performing an

ADC conversion and will be high when no device is busy.

Similarly, when polling for interrupt status, the output will

be low when any device has an interrupt condition and will

be high when none has an interrupt condition.

Level Polling—Daisy-Chained Broadcast Polling: The SDO

pin (bottom device) or SDI pin (stacked devices) will be

low if a device is busy/in interrupt. If it is not busy/not

in interrupt, the device will pass the level from the SDOI

input to data out (if not the top-of-stack device) or hold the

data out line high (if the top-of-stack device). Therefore,

if any device in the chain is busy or in interrupt, the SDO

signal at the bottom of the stack will be low. If all devices

are not busy/not in interrupt, the SDO signal at the bot-

tom of the stack will be high. The master pulls CSBI high

to exit polling.

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