LT8491 datasheet(16/82 Pages) AD

16 / 82 page

LT8491

Rev. 0

For more information www.analog.com

OPERATION

Figure 3. I2C Byte-Write Transaction

Figure 4. I2C Byte-Read Transaction

Figure 5. I2C Word-Read Transaction

CHIP ADDR

A6:A0

FROM MASTER TO SLAVE

A: ACKNOWLEDGE (LOW)

A: NOT ACKNOWLEDGE (HIGH)

R: READ BIT (HIGH)

W: WRITE BIT (LOW)

S: START CONDITION

P: STOP CONDITION

FROM SLAVE TO MASTER

b7:b0

8491 F03

REG ADDR

DATA

A P

CHIP ADDR

A6:A0

CHIP ADDR

A6:A0

b7:b0

8491 F04

REG ADDR

DATA

CHIP ADDR

A6:A0

CHIP ADDR

A6:A0

b7:b0

8491 F05

REG ADDR

DATA0

b7:b0

DATA1

I2C DATA

Data: Memory Regions

Data in the LT8491 is arranged into six regions as shown

in Table 1.

Table 1. LT8491 I2C Addressable Memory Regions

REGION

TYPE

I2C REG

ADDR RANGE DESCRIPTION

Telemetry

Registers

0x00-0x11

Charging telemetry.

Status

Registers

0x12-0x1F

Charging and system status.

Control

Registers

0x20-0x27

Control charging on/off and

EEPROM access.

Configuration Registers

0x28-0x5B

Charger configuration settings.

Manufacturer Registers

0x5C-0x61

Manufacturer Data.

Boot

EEPROM

0x88-0xBD Non-volatile storage of start-up

configuration.

Telemetry Region: These read-only registers indicate

telemetry such as temperature, voltage, current, power

and efficiency. These word-sized values must be read

using the I2C word-read transaction to avoid retrieving

mismatched bytes (see I2C: Data Transfer Transactions).

See the Telemetry Operation and Telemetry Registers sec-

tions for further telemetry information.

Status Region: These read-only registers indicate status

such as charging state, solar panel state, faults, timers

and others. Detailed status register descriptions are pro-

vided in the Status Registers section.

Control Region: These read-write registers are used to

start and stop the charger, write to the EEPROM, reset the

chip and other related functions. The contents of these

registers revert to their default values, as listed in the

I2C Register Map, after power is cycled or the CTRL_

RESTART_CHIP register is written to 0x99. Detailed con-

trol register descriptions are provided in the I2C Register

Descriptions section.

Configuration Region: These read-write registers deter-

mine the charger settings such as timer limits, restart

options, VBAT stage voltages, and many others. After

power-up or reset, the configuration registers are auto-

matically loaded with data from the EEPROM (see the

Startup Sequence section). Factory default EEPROM val-

ues are provided in the I2C Register Map. Detailed con-

figuration register descriptions are provided in the I2C

Manufacturer Region: These read-only registers indicate

manufacturer data that is determined at the factory.

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