LTC4012 datasheet(39/52 Pages) AD

39 / 52 page

LTC4162-L

Rev A

For more information www.analog.com

Symbol Name

Command

Code

Access

Bit

Range Default Description

en_constant_

current_alert

[1]

Interruptrequestthatcausesaconstant_current_alertSMBALERTuponconstant_current

indicating that the battery charger constant current regulation loop has taken control

of the switching regulator.

en_constant_

voltage_alert

[0]

Interruptrequestthatcausesaconstant_voltage_alertSMBALERTuponconstant_voltage

indicating that the battery charger constant voltage regulation loop has taken control

of the switching regulator.

thermal_reg_start_

temp

0x10

R/W

[15:0]

17897

Signed number that sets the start of the temperature region for thermal regulation. To

prevent overheating, a thermal regulation feedback loop utilizing die_temp sets an upper

limit on icharge_dac following a linear gradient from full scale (31) to minimum scale

(0) between thermal_reg_start_temp and thermal_reg_end_temp. The default value of

17897 corresponds to 120°C.

thermal_reg_end_

temp

0x11

R/W

[15:0]

18130

Signed number that sets the end of the temperature region for thermal regulation. To

prevent overheating, a thermal regulation feedback loop utilizing die_temp sets an upper

limit on icharge_dac following a linear gradient from full scale (31) to minimum scale

(0) between thermal_reg_start_temp and thermal_reg_end_temp. The default value of

18130 corresponds to 125°C.

CONFIG_BITS_REG

0x14

R/W

[5:1]

System configuration settings

suspend_charger

[5]

Causes battery charging to be suspended. This setting should be used cautiously.

For embedded battery systems where two wire interface communication relies on a

minimum battery voltage, setting this bit could result in a deadlock that may require

factory service to correct.

run_bsr

[4]

Causes the battery equivalent-series-resistance (bsr) measurement to be made as soon

as a charge cycle starts or immediately if a charge cycle is already running.

telemetry_speed

[3]

Forces the telemetry system to take measurements at the higher rate of approximately

once every 11ms whenever the telemetry system is on. When this bit is disabled, the

telemetrysystemwillslowdowntoaboutonceevery5storeducepowerwhennotcharging.

Setting telemetry_speed to tel_high_speed in conjunction with force_telemetry_on with

no input power available will increase battery drain.

Enums: tel_high_speed = 1,

tel_low_speed = 0

force_telemetry_on

[2]

Causes the telemetry system to operate at all times, including times when only battery

power is available.

mppt_en

[1]

Causes the Maximum Power-Point Tracking algorithm to run. The maximum power

point algorithm takes control of the input undervoltage regulation control loop via the

input_undervoltage_dac to seek the optimum power-point for resistive sources such

as a long cable or solar panel.

iin_limit_target

0x15

R/W

[5:0]

Controls the target input current limit setting. The input current is limited by regulating

charge current in response to the voltage across an external current sense resistor,

RSNSI, between the CLP and CLN pins and is given by (iin_limit_target + 1) × 500µV /

RSNSI. Note that the LTC4162 can only limit charge current based on this setting. It does

not have the authority to block current from passing directly through to the system load.

Connecting the system load to the battery, however, can allow total input current control.

input_undervoltage_

setting

0x16

R/W

[7:0]

Controls the input undervoltage regulation setting. The regulation voltage, given by

(input_undervoltage_setting + 1) × 140.625mV, is the voltage at which the charge

current will be reduced to prevent further droop in supply voltage due to a resistive

source. If mppt_en is set, the MPPT algorithm will override this setting. The actual input

undervoltage value can be read back from the input_undervoltage_dac.

arm_ship_mode

0x19

R/W

[15:0]

Setting this register to arm arms the ultra low-power ship and store mode. Ship mode

does not take effect until the VIN pin drops below approximately 1V or immediately if

VIN is already below 1V.

Enum: arm = 21325

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