LTC6803IG-2 データシートの表示（PDF） - Linear Technology

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LTC6803IG-2

Multicell Battery Stack Monitor

Linear Technology 

LTC6803-2/LTC6803-4

OPERATION

CSBI

tCYCLE

SCKI

SDI

MSB (CMD) BIT6 (CMD)

LSB (PEC)

SDO

TOGGLE OR LEVEL POLL

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Figure 5. Transmission Format (ADC Conversion and Poll)

CSBI

SCKI

SDI

MSB (CMD) BIT6 (CMD)

LSB (PEC)

SDO

TOGGLE OR LEVEL POLL

680324 F06

Figure 6. 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—Address Polling: The addressed device

drives the SDO line based on its state alone—low for busy/

in interrupt, toggling at 1kHz for not busy/not in interrupt.

Toggle Polling—Parallel Broadcast Polling: No part ad-

dress is sent, so all devices respond simultaneously. If a

device is busy/in interrupt, it will pull SDO low. If a device

is not busy/not in interrupt, then it will release the SDO line

(TOS = 0) or attempt to toggle the SDO line at 1kHz (TOS

= 1).The master controller 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—Address Polling: The addressed device

drives the SDO line based on its state alone—pulled low

for busy/in interrupt, released for not busy/not in interrupt.

Level polling—Parallel Broadcast Polling: No part address

is sent, so all devices respond simultaneously. If a device

is busy/in interrupt, it will pull SDO low. If a device is not

busy/not in interrupt, then it will release the SDO line. If

any device is busy or in interrupt the SDO signal will be

low. If all devices are not busy/not in interrupt, the SDO

signal will be high. The master controller pulls CSBI high

to exit polling.

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