LTC6804 datasheet(21/90 Pages) AD

21 / 90 page

LTC6810-1/LTC6810-2

Rev. A

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OPERATION

MEASURE State

The LTC6810 performs ADC conversions in this state. The

references and ADCs are powered up.

After ADC conversions are complete the LTC6810 will

transition to either the REFUP or STANDBY states,

depending on the REFON bit. Additional ADC conversions

can be initiated more quickly by setting REFON = 1 to take

advantage of the REFUP state.

Note: Non-ADC commands do not cause a Core state tran-

sition. Only an ADC Conversion or DIAGN command will

place the Core in the MEASURE state.

EXTENDED BALANCING State

The watchdog timer has timed out, but the discharge timer

has not yet timed out (DTEN = 1). Discharge by PWM may

be in progress. If the Discharge Timer Monitor is enabled

then the LTC6810 will transition to the DTM MEASURE

state every 30 seconds to measure the cell voltages. If a

WAKEUP signal is received, the LTC6810 will transition

from EXTENDED BALANCING state to STANDBY state.

Discharge Timer Monitor MEASURE State

The watchdog timer has timed out but background moni-

toring has been enabled (DTMEN = 1 in the Configuration

EXTENDED BALANCING state once every 30 seconds to

measure the cell voltages. The LTC6810 is in the highest

core power state and an A/D conversion is in progress. If

a WAKEUP signal is received, the LTC6810 will transition

from DTM MEASURE state to STANDBY state.

isoSPI STATE DESCRIPTIONS

Note: The LTC6810-1 has two isoSPI ports (A and B), for

daisy-chain communication. The LTC6810-2 has only one

isoSPI port (A), for parallel-addressable communication.

IDLE State

The isoSPI ports are powered down.

When isoSPI port A or port B (LTC6810-1 only) receives a

WAKEUP signal (see Waking up the Serial Interface), the

isoSPI enters the READY state. This transition happens

quickly (within tREADY) if the Core is in the STANDBY state.

If the Core is in the SLEEP state when the isoSPI receives

a WAKEUP signal, the it transitions to the READY state

within tWAKE.

READY State

The isoSPI port(s) are ready for communication. Port

B is enabled only for LTC6810-1, and is not present on

the LTC6810-2. The serial interface current in this state

depends on if the part is LTC6810-1 or LTC6810-2, the

status of the ISOMD pin, and RBIAS = RB1 + RB2 (the

external resistors tied to the IBIAS pin).

If there is no activity (i.e. no WAKEUP signal) for greater

than tIDLE = 5.5ms, the LTC6810 goes to the IDLE state.

When the serial interface is transmitting or receiving data

the LTC6810 goes to the ACTIVE state.

ACTIVE State

The LTC6810 is transmitting/receiving data using one

or both of the isoSPI ports. The serial interface con-

sumes maximum power in this state. The supply current

increases with clock frequency as the density of isoSPI

pulses increases.

LTC6804 Datasheet(PDF) 21 Page - Analog Devices

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