LTC4012 datasheet(34/48 Pages) AD

34 / 48 page

LTC4162-S

Rev B

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Symbol Name

Command

Code

Access

Bit

Range

Default Description

vbat_lo_alert_limit

0x01

R/W

[15:0]

Signed number that sets a lower limit that can be used to trigger an interrupt based on

the battery voltage out of range. The alert is enabled by setting en_vbat_lo_alert and

can be read back and cleared at vbat_lo_alert. The value is based on the A/D value,

vbat, which 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.

vbat_hi_alert_limit

0x02

R/W

[15:0]

Signed number that sets an upper limit that can be used to trigger an interrupt based

on the battery voltage out of range. The alert is enabled by setting en_vbat_hi_alert

and can be read back and cleared at vbat_hi_alert. The value is based on the A/D value,

vbat, which 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_lo_alert_limit

0x03

R/W

[15:0]

Signed number that sets a lower limit that can be used to trigger an interrupt based on

input voltage out of range. The value is based on the A/D value, vin, which has a scaling

factor of 1.649mV/LSB. The alert is enabled by setting en_vin_lo_alert and can be read

back and cleared at vin_lo_alert.

vin_hi_alert_limit

0x04

R/W

[15:0]

Signed number that sets an upper limit that can be used to trigger an interrupt based on

input voltage out of range. The value is based on the A/D value, vin, which has a scaling

factor of 1.649mV/LSB. The alert is enabled by setting en_vin_hi_alert and can be read

back and cleared at vin_hi_alert.

vout_lo_alert_limit

0x05

R/W

[15:0]

Signed number that sets a lower limit that can be used to trigger an interrupt based on

vout voltage out of range. The value is based on the A/D value, vout, which has a scaling

factor of 1.653mV/LSB. The alert is enabled by setting en_vout_lo_alert and can be read

back and cleared at vout_lo_alert.

vout_hi_alert_limit

0x06

R/W

[15:0]

Signed number that sets an upper limit that can be used to trigger an interrupt based

on vout voltage out of range. The value is based on the A/D value, vout, which has a

scaling factor of 1.653mV/LSB. The alert is enabled by setting en_vout_hi_alert and can

be read back and cleared at vout_hi_alert.

iin_hi_alert_limit

0x07

R/W

[15:0]

Signed number that sets an upper limit that can be used to trigger an interrupt based on

input current out of range. The value is based on the A/D value, iin, which has a scaling

factor of 1.466µV / RSNSI amperes/LSB. The alert is enabled by setting en_iin_hi_alert

and can be read back and cleared at iin_hi_alert.

ibat_lo_alert_limit

0x08

R/W

[15:0]

Signed number that sets a lower limit that can be used to trigger an interrupt based on

charge current dropping below a particular value, such as during the constant-voltage

phase of charging, or, load current exceeding a particular limit when not charging.

When the charger is not running, and telemetry is enabled with force_telemetry_on,

this limit indicates that the battery draw has exceeded a particular value. Telemetry will

be enabled automatically if the input voltage exceeds the battery voltage, in which case

discharge current will be nearly zero. ibat values are positive for charging and negative

for discharging so the polarity of this register should be set according to the mode

in which the limit alert is of interest. The value is based on the A/D value, ibat, which

has a scaling factor of 1.466µV / RSNSB amperes/LSB. The alert is enabled by setting

en_ibat_lo_alert and can be read back and cleared at ibat_lo_alert.

die_temp_hi_alert_

limit

0x09

R/W

[15:0]

Signed number that sets an upper limit that can be used to trigger an interrupt based

on high die temperature. The value in °C can be calculated from the A/D reading,

die_temp, as TDIE(°C) = die_temp × 0.0215°C/LSB - 264.4°C. The alert is enabled by

setting en_die_temp_hi_alert and can be read back and cleared at die_temp_hi_alert.

bsr_hi_alert_limit

0x0A

R/W

[15:0]

Setsanupperlimitthatcanbeusedtotriggeraninterruptbasedonhighbatteryresistance.

The battery resistance measurement is proportional to the battery charge current setting

resistor, RSNSB, and can be computed in Ω from: BSR = N × bsr × RSNSB / 250 where

N is 1, 2, 3 or 4 for a 6V, 12V, 18V or 24V battery respectively as set by the CELLS0/

CELLS1 pins. The alert is enabled by setting en_bsr_hi_alert and can be read back and

cleared at bsr_hi_alert.

LTC4012 Datasheet(PDF) 34 Page - Analog Devices

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