LTC4015_15 Datasheet, PDF (53/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Register Descriptions
SYMBOL
EQUALIZE_TIMER
CHARGER_STATE
equalize_charge
absorb_charge
charger_suspended
precharge
cc_cv_charge
ntc_pause
timer_term
c_over_x_term
max_charge_time_fault
bat_missing_fault
bat_short_fault
CHARGE_STATUS
vin_uvcl_active
iin_limit_active
constant_current
constant_voltage
LIMIT_ALERTS
meas_sys_valid_alert
qcount_lo_alert
qcount_hi_alert
vbat_lo_alert
vbat_hi_alert
vin_lo_alert
vin_hi_alert
vsys_lo_alert
vsys_hi_alert
iin_hi_alert
ibat_lo_alert
SUB R/W ACTIVE DESCRIPTION
ADDR
BITS
0x33 R 15:0 For lead-acid batteries, indicates the time (in sec) that the battery has
been in EQUALIZE phase
0x34 R 15:0 Real time battery charger state indicator. Individual bits are mutually
exclusive. Bits 15:11 are reserved.
10 indicates battery charger is in lead-acid equalization charge state
9 indicates battery charger is in absorb charge state
8 indicates battery charger is in charger suspended state
7 indicates battery charger is in precondition charge state
6 indicates battery charger is in constant-current constant-voltage state
5 indicates battery charger is in thermistor pause state
4 indicates battery charger is in timer termination state
3 indicates battery charger is in C/x termination state
2 indicates battery charger is in max_charge_time_fault state
1 indicates battery charger is in missing battery fault state
0 indicates battery charger is in shorted battery fault state
0x35 R 15:0 Charge status indicator. Individual bits are mutually exclusive. Only
active in charging states.
3 indicates the input undervoltage control loop is actively controlling
power delivery based on VIN_UVCL_SETTING (0x16)
2 indicates the input current limit control loop is actively controlling
power delivery based on IIN_LIMIT_DAC (0x46)
1 indicates the charge current control loop is actively controlling
power delivery based on ICHARGE_DAC (0x44)
0 indicates the battery voltage control loop is actively controlling power
delivery based on VCHARGE_DAC (0x45)
0x36 R
15:0 Limit alert register.
Individual bits are enabled by EN_LIMIT_ALERTS (0x0D).
Writing 0 to any bit clears that alert.
Once set, alert bits remain high until cleared or disabled.
15 indicates that measurement system results have become valid.
13 indicates QCOUNT has fallen below QCOUNT_LO_ALERT_LIMIT (0x10)
12 indicates QCOUNT has exceeded QCOUNT_HI_ALERT_LIMIT (0x11)
11 indicates VBAT has fallen below VBAT_LO_ALERT_LIMIT (0x01)
10 indicates VBAT has exceeded VBAT_HI_ALERT_LIMIT (0x02)
9 indicates VIN has fallen below VIN_LO_ALERT_LIMIT (0x03)
8 indicates VIN has exceeded VIN_HI_ALERT_LIMIT (0x04)
7 indicates VSYS has fallen below VSYS_LO_ALERT_LIMIT (0x05)
6 indicates VSYS has exceeded VIN_HI_ALERT_LIMIT (0x06)
5 indicates IIN has exceeded IIN_HI_ALERT_LIMIT (0x07)
4 indicates IBAT has fallen below IBAT_LO_ALERT_LIMIT (0x08)
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For more information www.linear.com/LTC4015
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