LTC4015_15 Datasheet, PDF (54/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Register Descriptions
SYMBOL
die_temp_hi_alert
bsr_hi_alert
ntc_ratio_hi_alert
ntc_ratio_lo_alert
CHARGER_STATE_ALERTS
equalize_charge_alert
absorb_charge_alert
charger_suspended_alert
precharge_alert
cc_cv_charge_alert
ntc_pause_alert
timer_term_alert
c_over_x_term_alert
max_charge_time_fault_alert
bat_missing_fault_alert
bat_short_fault_alert
CHARGE_STATUS_ALERTS
vin_uvcl_active_alert
iin_limit_active_alert
constant_current_alert
constant_voltage_alert
SYSTEM_STATUS
charger_enabled
mppt_en_pin
equalize_req
drvcc_good
cell_count_error
SUB R/W ACTIVE DESCRIPTION
ADDR
BITS
DEFAULT PAGE
3 indicates DIE_TEMP has exceeded DIE_TEMP_HI_ALERT_LIMIT (0x09)
69
2 indicates BSR has exceeded BSR_HI_ALERT_LIMIT (0x0A)
69
1
indicates NTC_RATIO has exceeded NTC_RATIO_HI_ALERT_LIMIT
(cold battery; 0x0B)
69
0
indicates NTC_RATIO has exceeded NTC_RATIO_LO_ALERT_LIMIT
(hot battery; 0x0C)
69
0x37 R 15:0 Charger state alert register.
69
Individual bits are enabled by EN_CHARGER_STATE_ALERTS (0x0E).
Writing 0 to any bit clears that alert.
Once set, alert bits remain high until cleared or disabled.
10 alert indicates charger has entered lead-acid equalize_charge state (0x34)
69
9 alert indicates charger has entered absorb_charge state (0x34)
69
8 alert indicates charger has entered charger_suspended(off) state (0x34)
69
7 alert indicates charger has entered precharge charge state (0x34)
69
6
alert indicates charger has entered cc_cv_charge state (constant-current
constant-voltage; 0x34)
69
5 alert indicates charger has entered ntc_pause state (0x34)
69
4 alert indicates charger has entered timer_term state (0x34)
69
3
alert indicates charger has entered c_over_x term state
(C/x termination; 0x34)
69
2 alert indicates charger has entered max_charge_time_fault state (0x34)
70
1 alert indicates charger has entered bat_missing_fault state (0x34)
70
0 alert indicates charger has entered bat_short_fault state (0x34)
70
0x38 R 5:0 Alerts that CHARGE_STATUS indicators have occurred
Individual bits are enabled by EN_CHARGE_STATUS_ALERTS (0x0F)
Writing 0 to any bit clears that alert.
70
Once set, alert bits remain high until cleared or disabled.
3
alert indicates vin_uvcl_active state entered (V_IN undervoltage current
limit, 0x35)
70
2 alert indicates iin_limit_active state entered (V_IN current limit; 0x35)
70
1 alert indicates constant_current state entered (0x35)
70
0 alert indicates constant_voltage state entered (0x35)
70
0x39 R 15:0 Real time system status indicator bits
70
13 indicates that the battery charger is active
70
11
indicates the mppt_en pin is set to enable maximum power point
tracking
70
10 indicates a rising edge has been detected at the EQ pin, and an lead-acid
equalize charge is queued
70
9 indicates DRV_CC voltage is above switching charger undervoltage
lockout level (4.3V typical)
71
8 indicates an invalid combination of CELLS pin settings
71
4015f
54
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