LTC4012 datasheet(41/48 Pages) AD

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LTC4162-S

Rev B

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Symbol Name

Command

Code

Access

Bit

Range

Default Description

iin_limit_active_alert

[2]

Alertthatindicatesthatcharge_statusisiin_limit_active.Thisalertbitisclearedbywriting

it back to 0 with the remaining bits in this register set to 1s. It can also be cleared by

clearing en_iin_limit_active_alert.

constant_current_

alert

[1]

Alert that indicates that charge_status is constant_current. This alert bit is cleared by

writing it back to 0 with the remaining bits in this register set to 1s. It can also be cleared

by clearing en_constant_current_alert.

constant_voltage_

alert

[0]

Alert that indicates that charge_status is constant_voltage. This alert bit is cleared by

writing it back to 0 with the remaining bits in this register set to 1s. It can also be cleared

by clearing en_constant_voltage_alert.

SYSTEM_STATUS_

REG

0x39

[8:0]

N/A

Real time system status indicator bits

en_chg

[8]

N/A

Indicates that the battery charger is active.

cell_count_err

[7]

N/A

A cell count error will occur and charging will be inhibited if the CELLS0 and CELLS1 pins

are programmed for anything other than a 6V, 12V, 18V or 24V battery. cell_count_err

always indicates true when telemetry is not enabled such as when the charger is not

enabled.

no_rt

[5]

N/A

IndicatesthatnofrequencysettingresistorisdetectedontheRTpin.TheRTpinimpedance

detection circuit will typically indicate a missing RT resistor for values above 1.4MΩ.

no_rt always indicates true when the battery charger is not enabled such as when there

is no input power available.

thermal_shutdown

[4]

N/A

Indicates that the LTC4162 is in thermal shutdown protection due to an excessively high

die temperature (typically 150°C).

vin_ovlo

[3]

N/A

Indicates that input voltage shutdown protection is active due to an input voltage above

its protection shut-down threshold of approximately 38.6V.

vin_gt_vbat

[2]

N/A

Indicates that the VIN pin voltage is sufficiently above the battery voltage to begin a

charge cycle (typically +150mV).

vin_gt_4p2v

[1]

N/A

Indicates that the VIN pin voltage is at least greater than the switching regulator under-

voltage lockout level (4.2V typical).

intvcc_gt_2p8v

[0]

N/A

Indicates that the INTVCC pin voltage is greater than the telemetry system lockout level

(2.8V typical).

vbat

0x3A

[15:0]

Signed number that indicates the A/D measurement for the battery voltage. The value

has a scaling factor of 384.8µV/LSB for each multiple of 6V chosen by the CELLS0/

CELLS1 pins. To compute the total battery voltage multiply this value by 1, 2, 3 or 4

representing a 6V, 12V, 18V or 24V battery respectively.

vin

0x3B

[15:0]

Signed number that indicates the A/D measurement for the input voltage. The value is

basedontheA/Dscalingfactorfortheinputvoltagemeasurementwhichis1.649mV/LSB.

vout

0x3C

[15:0]

SignednumberthatindicatestheA/Dmeasurementforthevoutvoltage.Thevalueisbased

on the A/D scaling factor for the output voltage measurement which is 1.653mV/LSB.

ibat

0x3D

[15:0]

Signed number that indicates the A/D measurement for the battery current. The value

is based on the A/D scaling factor for the charge current measurement (VCSP - VCSN)

whichis1.466µV/RSNSBamperes/LSB.Ifthechargerisnotenabledthevaluerepresents

drain on the battery and will be negative.

iin

0x3E

[15:0]

Signed number that indicates the A/D measurement for the input current (VCLP - VCLN).

The value is based on the A/D scaling factor for the input current measurement which

is 1.466µV / RSNSI amperes/LSB.

die_temp

0x3F

[15:0]

Signed number that indicates the A/D measurement for the die temperature. The value

can be calculated from the A/D reading in °C as TDIE(°C) = die_temp × 0.0215°C/

LSB - 264.4°C.

LTC4012 Datasheet(PDF) 41 Page - Analog Devices

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